Answer and Explanation:
Definition of Terms
Lack of water availability is a natural situation that occurs where and when water becomes scarce and not readily available for use.
Possible Threats
Most of the threats caused b water lack of water availability are caused by human activities both necessary and unnecessary while others are caused by nature responding to some of those human activities. These threats include pollution, change of landscape, urban growth, deforestation and climate change.
How to reverse these threats
Implementing adequate hydrologically-based water assessment and management processes:
Landscape changes which are inevitable, are of different types and therefore poses different specific impact on the ecosystems directly or on water availability indirectly. The strength of the impacts will vary with a wide range of possible landscape changes depending the settings conditions. For this reason, it is imperative that for certain parts of the world where the threat of water availability is experienced that adequate hydrologically-based water assessment and management processes be implemented.
Developing optimum, scalable and energy efficient plants for desalination:
For man ears desalination has helped solved lack of water availability in certain parts of the world, but these desalination plants are energy-intensive. However, with newer technologies, these plants would require less energy and when utilized would reverse the threats posed by lack of water availability.
Innovative water catchment and harvesting:
Water catchment systems are imperative for areas with lack of water availability in order to store more waters as gotten from other sources where it is readily available, whilst also recycling the waste waters in those areas too.
Better policies and regulations while educating the masses:
Lack of water availability would affect food security and even cause pollution, therefore the government would need to make better policies and regulations guiding the use of water whilst educating the masses on the need to change their water consumption and lifestyles. And this is easily done when the water available is appropriately priced.
Holistic Ecosystem management:
This type of management means taking into account the ecological, economic and cultural goals that affects the country's natural resources, and this approach has to be holistic, logical and practical. Why holistic approach? Simply because each aspect is related to and influenced by the others.
Improved Distribution Infrastructure:
Poor infrastructure poses threats to health and even the nations economy. The infrastructural system in place for waver distribution must be of good quality and constantly checked and maintained.
The above stated approach would reverse lack of water availability in any nation.
PLEASE HELP!!
Which of the following is true about the mass of an object?
It is equal to its weight.
It is proportional to its weight.
It is always more than its weight
It changes at different locations.
Answer:
It is proportional to its weight.
Explanation:
Answer:
The correct answer is "It is proportional to its weight."
Explanation:
Mass is the amount of matter that a body contains. Weight is the action exerted by the force of gravity on the body.
The mass of an object will always be the same, regardless of where it is located, because the amount of matter does not vary. Instead, the weight of the object will vary according to the force of gravity acting on it.
The mass is measured in kilograms (kg) and the weight is measured in newtons (N).
The weight is equal to the product of the object's mass and the value of the local gravitational acceleration:
P = m * g
It can be seen that the weight is proportional to the mass of the object.
Which characteristic of a protein may change during a DNA mutation?
ill give brainliest to the first person with correct answer
btw its science
Amino acid sequence.
Explanation:A Mutation is a change in a DNA sequence brought about either by a mistake made when the DNA is copied or through chemical damage or can by activity of any microbe. Regions of the genome, typically called genes, mutation effect these genes and protein, which perform most of the important jobs in cells. The sequence of letters in a gene determines the sequence of amino acids in the protein it encodes, a point mutation can change the amino acid sequence of the resulting protein. Sometimes a change in the protein's amino acid sequence can have severe results. Some DNA mutations are silent and have no effect, but others affect protein, essential molecules for life, that regulate whether the gene is active or not, make more or less protein or change protein synthesis altogether.Result: Amino acid sequence get changed in DNA mutation.
Answer:
Shape
Explanation:
I got it right on the tests.
Hope it helps.
How many grams of zinc are needed to produce 25.0 g ZnCl2
Final answer:
The grams of zinc needed are 11.98 g.
Explanation:
To determine how many grams of zinc are needed to produce 25.0 g of [tex]ZnCl2[/tex], we first need to calculate the molar mass of [tex]ZnCl2[/tex] which is (65.39 g/mol for Zn + 2 × 35.45 g/mol for Cl) = 136.29 g/mol.
Next, using stoichiometry, we use the molar mass of [tex]ZnCl2[/tex] to find out how many moles 25.0 g of [tex]ZnCl2[/tex] is, and subsequently, using the molar mass of Zn (65.39 g/mol), we find out the mass of Zn that would produce that number of moles of [tex]ZnCl2[/tex]
The calculation goes as follows:
Calculate moles of [tex]ZnCl2[/tex]: 25.0 g ZnCl2 ÷ 136.29 g/mol = 0.1833 mol [tex]ZnCl2[/tex]
Since the stoichiometry between Zn and ZnCl2 is 1:1, we have the same number of moles of Zn.
Calculate mass of Zn needed: 0.1833 mol Zn × 65.39 g/mol = 11.98 g Zn
Therefore, 11.98 g of zinc are needed to produce 25.0 g of [tex]ZnCl2[/tex]
NEED THE ANSWER !!! NOW i have like an hour
Which chemical reaction model is flawed?
A.
4 C2 + S8 → 4 CS2
B.
2 Fe + 3 Cl2 → 2 FeCl3
C.
2 Na + Cl2 → 2 NaCl
D.
P4O10 + 6 H2O → 4 H3PO4
Part 2
Which best explains the correct answer to Part 1?
A.
The products side of the equation should include water.
B.
The model shows an unbalanced number of carbon atoms.
C.
The coefficients on the reactants and products sides of the equation do not match.
D.
The same elements are on both the reactants and products sides of the equation.
Answer No 1:
The chemical model that is flawed is:
4 C2 + S8 → 4 CS2
In this reaction, there are more number of carbon atoms in the reactants but lesser number of cabon atoms in the products. For a reaction to be balanced, there should be the same number of atoms in the reactants and products. Hence, option A does not represent a balanced equation.
Answer No 2:
The correct option is B) The model shows an unbalanced number of carbon atoms.
Consider the equation:
4 C2 + S8 → 4 CS2
In the reactants side of the equation, there are 8 atoms of carbon. In the products side there are only four carbon atoms. This shows that this equation in not balanced because of the carbon atoms.
The number of sulfur atoms remains same before the reaction and after the reaction. There are eight sulfur atoms in the reactants as well as products.
The symbol Ca-40 denotes that
A. a calcium atom contains 40 protons
B. a calcium atom contains 40 electrons
C. a calcium atom contains 40 neutrons
D. a calcium atom has a mass number of 40
The Ca-40 notation indicates that this calcium isotope has a mass number of 40, which is made up of 20 protons and 20 neutrons.
Explanation:The symbol Ca-40 represents a calcium isotope and indicates the mass number of this particular atom. The mass number is the sum of the number of protons and neutrons in an atom's nucleus. Calcium's atomic number, which is the number of protons, is 20. To find the number of neutrons, we subtract the atomic number from the mass number. Hence, the number of neutrons in Ca-40 is 40 - 20 = 20 neutrons. From the provided options, the correct statement is D. A calcium atom has a mass number of 40.
The symbol Ca-40 denotes a calcium atom which has a mass number of 40. The mass number is the sum of the protons and the neutrons in an atom. To find the number of neutrons, we subtract the number of protons from the mass number. Therefore, the correct answer is D. a calcium atom has a mass number of 40.
Which element is the reducing agent in a redox reaction?
O
A. The reactant that has the atom that gets oxidized
O
B. The product that has the atom that was oxidized
C. The reactant that has the atom that gets reduced
O
D. The product that has the atom that was reduced
SUBMI
Answer:
The reactant that has the atom that gets oxidized
Explanation:
A redox reaction is a reaction in which one substance is oxidized and one is reduced. The easiest way to remember the patterns of any redox reaction is to follow a simple abbreviation: OILRIG.
This acronym stands for: oxidation is loss, reduction is gain (of electrons). Therefore, if a substance is oxidized, then it loses electrons. If a substance is reduced, it gains electrons.
Let's take a look at the following example:
[tex]Cu (s) + 2 Ag^+ (aq)\rightarrow Cu^{2+} (aq) + 2 Ag (s)[/tex]
Notice that copper loses two electrons, as it becomes positively charged:
[tex]Cu (s)\rightarrow Cu^{2+} (aq) + 2e^-[/tex]
Since electrons are on the right-hand side, it means we produce them (they are lost). Hence, copper in this equation is oxidized. Similarly:
[tex]Ag^+(aq)+e^-\rightarrow Ag(s)[/tex]
Now, silver cation gains electrons to become solid silver, neutrally charged, meaning it is reduced.
In terms of an oxidizing/reducing agents, the thought process is opposite: in an oxidation process, we have a reducing agent, hence, Cu (s) is our reducing agent. In a reduction process, we have an oxidizing agent, hence, silver cation is our oxidizing agent.
Both reducing and oxidizing agents are reactants.
Therefore, reducing agent is a reactant that has the atom that gets oxidized.
Answer: A
Explanation:
a p e x
Which of these is associated with the kinetic energy of electricity?
A.waves in fluids
B.moving electrons
C.the position of magnets
D.vibration of ions
Answer:
B.
Explanation: hoped i helped =O
An object sliding along a horizontal table is an example of projectile motion.
A. True
B. False
Answer:
False
Explanation:
"Projectile motion is a form of motion experienced by an object or particle that is thrown near the Earth's surface and moves along a curved path under the action of gravity only. This curved path was shown by Galileo to be a parabola." -Wikipedia
The object does not take a parabolic trajectory through the air.
Which solution is the most concentrated?
2.0 mL of 10 M H2SO4, where H2SO4 has a molar mass of 98 g/mol
5.0 mL of 1.0 M PbSO4, where PbSO4 has a molar mass of 303 g/mol
2.0 mL of 10.5 M H2O2, where H2O2 has a molar mass of 34 g/mol
100 mL of 10 M NaCl, where NaCl has a molar mass of 58 g/mol
Answer:
2.0 mL of 10.5 M H2O2, where H2O2 has a molar mass of 34 g/mol.
Explanation:
It is most concentrated because it contains 10.5 M of Hydrogen peroxide.
Answer:100 mL of 10 M NaCl, where NaCl has a molar mass of 58 g/mol
Explanation:
Concentration refers to the amount of substance in moles present in a solution. Number of moles is obtained from; number of moles= concentration*volume
For our chosen answer, 100/1000 * 10=1 mole. If we follow this procedure to calculate the amount of other solutions stated in the question, we will realize that 100ml of 10M NaCl has the highest number of moles present. Since concentration has to do with the number of moles present in a solution, this is the most concentrated solution.
Determine the equilibrium concentration when 1.00 mole of I2 and 1.00 mole of H2 are put into a 5 liter container. At the reaction temperature, the Keq is 64.0
H2 (g) + I2 (g) 2HI (g)
Answer:
The equilibrium concentration are :
[tex]{H_{2}}[/tex] = 0.04 M
[tex]{I_{2}}[/tex] = 0.04 M
[tex]{HI}[/tex] = 0.16 M
Explanation:
[tex]{H_{2}} + {I_{2}} \rightleftharpoons 2 HI[/tex]
it means 1 mole of iodine and hydrogen produce 2 mole of HI
Concentration(C) : Moles per unit volume.It is expressed in Molarity
(M=mol/L )
[tex]concentration = \frac{moles}{volume}[/tex]
Initial moles :
[tex]{H_{2}}[/tex] = 1.00
So, [tex]C = \frac{1}{V}[/tex]
[tex]{I_{2}}[/tex] = 1.00
[tex]C = \frac{1}{V}[/tex]
[tex]{HI}[/tex] = 0
[tex]C = \frac{0}{V}[/tex]
let during the reaction x moles of both [tex]{H_{2}}[/tex] and [tex]{I_{2}}[/tex] get dissociated , then
At equilibrium ,
[tex]{H_{2}}[/tex] = 1.00 - x
[tex]C = \frac{1-x}{V}[/tex]
For iodine
[tex]{I_{2}}[/tex] = 1.00 - x
[tex]C = \frac{1-x}{V}[/tex]
1.00 - x mole of hydrogen will produce 2x of HI
[tex]{HI}[/tex] = 2x
[tex]C = \frac{2x}{V}[/tex]
[tex]K_{eq} = \frac{[products]^{coefficient}}{[reactants]^{coefficient}}[/tex]
On solving for x , (look at the image)
[tex]{H_{2}}[/tex] = 0.04 M
[tex]{I_{2}}[/tex] = 0.04 M
[tex]{HI}[/tex] = 0.16 M
Final answer:
To find the equilibrium concentrations of H₂, I₂, and HI in the reaction H₂(g) + I₂(g) → 2HI(g), we must solve a quadratic equation using the given Keq of 64.0 and the initial concentrations calculated from the amounts and volume of the container.
Explanation:
Equilibrium Concentrations Calculation
To determine the equilibrium concentration of species in a reaction mixture, we can use the equilibrium constant (Keq) and the initial concentrations. For the reaction H₂(g) + I₂(g) → 2HI(g), we're given that the initial amounts are 1.00 mole of H₂ and 1.00 mole of I₂ placed into a 5-liter container. The equilibrium constant (Keq) at the reaction temperature is 64.0.
First, we calculate the initial concentrations:
Initial concentration of H₂ = (1.00 mole) / (5.00 L) = 0.20 M
Initial concentration of I₂ = (1.00 mole) / (5.00 L) = 0.20 M
Initially, the concentration of HI is zero since the reaction hasn't started.
At equilibrium, we'll have changed concentrations as follows, assuming x moles of H₂ react:
[H₂] = [I₂] = 0.20 M - x
[HI] = 0 + 2x
From the equilibrium expression,
Keq = [HI]^2 / ([H₂][I₂])
64.0 = (2x)^2 / ((0.20 - x)(0.20 - x))
We solve this quadratic equation for x to find the equilibrium concentrations.
After finding the value of x, we can determine the concentrations at equilibrium:
[H₂] = [I₂] = 0.20 M - x
[HI] = 2x
A liquid is matter that has a fixed volume and a fixed shape.
True
False
Please help!
N2 + 3H2 —> 2NH3
Suppose you have 2.0 L of nitrogen. How many liters of hydrogen do you need for a
complete reaction? (One mole of any gas occupies 22.4 L under certain conditions of
temperature and pressure. Assume those conditions for this question.)
Answer:
[tex]\large \boxed{\text{6 L}}[/tex]
Explanation:
We can use Gay-Lussac's Law of Combining Volumes to solve this problem.
Gases at the same temperature and pressure react in the same ratios as their coefficients in the balanced equation.
1. Write the chemical equation.
Ratio: 1 L 3 L
N₂ + 3H₂ ⟶ 2NH₃
V/L: 2
2. Calculate the volume of H₂.
According to Gay-Lussac, 3 L of H₂ react with 1 L of N₂.
Then, the conversion factor is (3 L H₂/1 L N₂).
[tex]\text{Volume of H}_{2} = \text{2 L N}_{2} \times \dfrac{ \text{3 L H}_{2} }{\text{1 L N}_{2}}= \textbf{6 L H}_{2}\\\text{You need $\large \boxed{\textbf{6 L}}$ of hydrogen,}[/tex]
To react completely with 2.0 L of nitrogen, you would need 6.0 L of hydrogen according to the stoichiometric ratio of the balanced chemical reaction N2 + 3 H2 → 2 NH3.
Explanation:For a complete reaction of nitrogen (N2) to form ammonia (NH3), you need three times the volume of hydrogen (H2) as the provided volume of nitrogen. Given that the balanced equation is N2 + 3 H2 → 2 NH3, and we know that one mole of a gas occupies 22.4 L at standard conditions, you can calculate the required volume of hydrogen. If you have 2.0 L of nitrogen, using the mole ratio of nitrogen to hydrogen from the balanced equation which is 1:3, you would need 3 times the volume of hydrogen gas. Hence you would need 2.0 L * 3 = 6.0 L of hydrogen for a complete reaction with 2.0 L of nitrogen.
The accepted value for the molar volume of a gas is
22.4 liters. In a laboratory experiment, a student
determines the value to be 24.8 liters. What is the
percent error of the student's measurement?
A) 0.120%
B) 0.107%
C) 10.7%
D) 12.0%
Answer:
C)10.7%
Explanation:
24.8-22.4=2.4
22.4→100%
2.4→X%
X=2.4×100/22.4=10.7%
The percent error of the student's measurement, using the correct calculations, is approximately 10.7%.
Explanation:The percent error is calculated using the formula: percent error = |(experimental value - accepted value)| / accepted value x 100%.
In this case, the accepted value of the molar volume of a gas is 22.4 liters (accepted value), and the student determined the value to be 24.8 liters (experimental value).
Thus, the percent error would be |(24.8 - 22.4)| / 22.4 x 100%, which results in approximately 10.7%. Therefore, the correct answer would be C) 10.7%.
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Which type of force occurs between two objects at a distance?
Answer:
Gravitational force of attraction.
Explanation:
When two bodies of masses 'm' and 'M' are separated by a distance 'r', then both the bodies experience a force of attraction towards each other. This force of attraction is called gravitational force. It is a weak force but it always act between two bodies that have mass.
The magnitude of the gravitational force is directly proportional to product of the masses and inversely proportional to the square of the distance between the masses.
This means that as the distance between the bodies is increases, the gravitational force between the bodies decreases and vice versa.
The gravitational force of attraction is given as:
[tex]F_g=\frac{GmM}{r^2}\\\\G\to \textrm{Universal Gravitational constant}[/tex]
Answer:
Its not gravitational force its Non contact force
Explanation:
Because noncontact force acts at a distance just like contact force acts in contact.
A solid sample of a compound and a liquid sample of the same compound are each tested for electrical conductivity. Which test conclusion indicates that the
compound is ionic?
A
Both the solid and the liquid are good conductors.
B
Both the solid and the liquid are poor conductors.
The solid is a good conductor, and the liquid is a poor conductor.
The solid is a poor conductor, and the liquid is a good conductor.
Answer: Choice D, The solid is a poor conductor and the liquid is a good conductor
Explanation:
Final answer:
The indication that a compound is ionic is that its solid form is a poor conductor of electricity, while its liquid (molten) form is a good conductor due to the free movement of ions.
Explanation:
The test conclusion that indicates that the compound is ionic would be that the solid is a poor conductor, and the liquid is a good conductor. This is because in solid ionic compounds, the strong ionic bonds hold the ions in place, preventing them from moving freely and conducting electricity. However, when the ionic compound is melted or dissolved in water, the ions are free to move about, which allows the liquid form to conduct electricity. Therefore, the correct option is that the solid is a poor conductor, and the liquid is a good conductor.
in a reaction that occurs in a solution, the volume will not change. What happens to the concentration of the reactants? What happens to the reaction rate as the reaction continues?
Answer:
Concentration of the reactants decreases;
Rate of a reaction decreases
Explanation:
Since volume is held constant in a solution, the concentration of the reactants will decrease.
Simply speaking, concentration is the ratio between moles and volume. Volume is constant here. Over time, the number of moles of the reactants will decrease, as they react to produce products and they are disappearing. Since moles are directly proportional to concentration, this implies that concentration will also decrease, while the concentration of the products will increase, as they're formed.
The rate of a reaction decreases as the reaction continues, as we have lower and lower amounts of the reactants remaining in the solution as time progresses. Therefore, the probability of a successful collision leading to products decreases.
a gas bbq grill usss propane gas, the propane is stored in a rigid tank. what happens to the pressure of the propane when the tank is left outside on a hot summer day & a cold winter day?
The pressure in a propane tank changes based on temperature due to Gay-Lussac's Law. On a hot day, the pressure in the tank will be higher than on a cold day. It's important to take into account the air temperature when deciding to refill the tank.
Explanation:The pressure inside a propane tank, such as one used for a BBQ grill, changes based on temperature due to Gay-Lussac's Law. In simplified terms, this principle states that the pressure of a gas is directly proportional to its temperature when the volume is held constant.
So, if a propane tank is left outside on a hot summer day, the gas inside the tank would get heated and its pressure would increase. Conversely, if the tank is left outside on a cold winter day, the temperature inside the tank would be lower and hence, its pressure would decrease.
This is why gauges that measure the pressure inside the propane tank register a higher pressure on a hot day than on a cold day. Therefore, when using gas grills, air temperature should be considered when deciding whether to refill the tank or not before the next cookout.
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How is "food" produced in ecosystems without sunlight?
Question 14 options:
A. by chemosynthesis
B. by photosynthesis
C. by phytoplankton
D. by autosynthesis
Final answer:
Food in ecosystems without sunlight is produced through chemosynthesis, a process where chemoautotrophs convert inorganic compounds into organic matter, supporting various deep-sea organisms.
Explanation:
The production of food in ecosystems without sunlight is primarily achieved through a process known as chemosynthesis. Chemosynthesis is the biological conversion of one or more carbon-containing molecules (usually carbon dioxide or methane) and nutrients into organic matter using the oxidation of inorganic compounds (such as hydrogen sulfide or ammonia) as a source of energy, rather than sunlight, as in photosynthesis. This process is utilized by a specialized group of bacteria, known as chemoautotrophs. Option A
Chemoautotrophs are commonly found in extreme environments, such as hydrothermal vents on the ocean floor. Here, they synthesize organic compounds by harnessing the energy from chemical reactions involving inorganic molecules, which are abundant in these regions. This in turn supports a diverse ecosystem, with organisms like tubeworms, crustaceans, and octopuses that rely on these bacteria for their own energy needs.
in which group does each element have a total of four electrons in the outermost principal energy level
Answer:
Group 14
Explanation:
The elements of the Periodic Table are arranged into 18 Groups.
Among the "main group elements" — those in Groups 1, 2 and 13 to 18 — the number of valence electrons — the number of electrons in the outermost energy level — corresponds to the last digit of the Group number.
Thus, Group 14 contains the elements with four valence electrons — C, Si, Ge, Sn, Pb, and Fl.
why do elements undergo chemical reactions?
Answer:
They have to
Explanation:
It occurs when 2 or more molecules interact and their bonds change
What’s this chemthink answer
Answer:
option A: Allow some of the helium to leak out in the air
option B: place the tank outside on a cold winter day
Explanation:
To choose the correct answer we will check each option one by one
option A:
Allow some of the helium to leak out in the air
The pressure will be decrease inside the tank when volume of gas in the container decrease. as we leak the helium gas from tank the number of molecules in the tank decreases that exert pressure on the wall of the container.
option B:
place the tank outside on a cold winter day
when we keep the tank in cold winter the kinetic energy of the molecules of the gas reduces also upon cooling the inter-molecular forces start operating and it decrease the collision of molecules with wall of the container and pressure inside tank decreases.
option C:
Place the tank in the trunk of a car on a hot summer day
when we keep the tank in the trunk of a car on a hot summer day the kinetic energy of the molecules of the gas increases and also upon increased temperature inter-molecular forces decrease and molecule move apart so the collision of molecules with wall of the container increases and pressure inside tank also increases.
option D:
Add more helium atoms to the tank
if we increases the volume of the gas in the container by adding more atoms in the tank it increases the pressure inside the tank and exert more pressure on the wall of the container so pressure inside the tank increase
So,
only option A and B is correct.
Without the context of the Chemthink problem you're facing, it's tough to provide an exact answer. Regardless, your answer should be grounded in fundamental chemistry principles, and remember that accuracy is vital in any calculations you might have to make.
Explanation:It's challenging to provide an exact answer without the context of the Chemthink problem that you are working on. Chemthink is an online platform that helps students learn various aspects of Chemistry. However, regardless of the question, your answer in Chemthink should be based on fundamental principles of Chemistry such as the Periodic Table, chemical bonds, reactions, etc. Ensure to recall these principles when answering questions. You might have to carry out some calculations, so accuracy is crucial. This answer would ideally be based on providing step-by-step solutions to the given problem or explaining a particular concept in a manageable way.
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NEED HELP ASAP!!! What is the density of each of the following gases at STP? Show your work.
A. C3H3
B. Ne
C. NO2
Answer:
A. 1.63g/dm^3 (3 s.f.)
B. 0.833g/dm^3 (3 s.f.)
C. 1.92g/dm^3 (3 s.f.)
Explanation:
Please see attached picture for full solution.
The density of gases at STP can be calculated using the molar mass and molar volume. C3H3 has a density of 1.74 g/L, Ne has a density of 0.90 g/L, and NO2 has a density of 2.06 g/L at STP.
Explanation:A. C3H3 (Propyne):
To calculate the density, we need to know the molar mass of the gas. The molar mass of C3H3 is 39.05 g/mol. At STP (Standard Temperature and Pressure), the molar volume of a gas is 22.4 L/mol. Therefore, the density of C3H3 at STP is:
Density = molar mass / molar volume
Density = 39.05 g/mol / 22.4 L/mol
Density = 1.74 g/L
B. Ne (Neon):
The molar mass of Neon is 20.18 g/mol. Using the same formula as above, we can calculate the density of Neon at STP:
Density = 20.18 g/mol / 22.4 L/mol
Density = 0.90 g/L
C. NO2 (Nitrogen Dioxide):
The molar mass of NO2 is 46.01 g/mol. Again, using the formula:
Density = 46.01 g/mol / 22.4 L/mol
Density = 2.06 g/L
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The enthalpies of formation of the compounds in the combustion of methane, , are CH4 (g): Hf = –74.6 kJ/mol; CO2 (g): Hf = –393.5 kJ/mol; and H2 O(g): Hf = –241.82 kJ/mol. How much heat is released by the combustion of 2 mol of methane? Use . 80.3 kJ 802.5 kJ 1,605.1 kJ 6,420.3 kJ
Answer:
ΔH°c = - 1605.1 KJ
Explanation:
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)∴ ΔHf CH4(g) = - 74.6 KJ/mol
∴ ΔHf CO2(g) = - 393.5bKJ/mol
∴ ΔHfH2O(g) = - 241.82 KJ/mol
standard enthalpy of combustion (ΔH°c):
⇒ ΔH°c = (2)(ΔHf H2O) + ΔHfCO2 - ΔHfCH4
⇒ ΔH°c = (2)(- 241.82) + ( - 393.5 ) - ( - 74.6 )
⇒ ΔH°c = - 802.54 KJ/mol
⇒ ΔH°c = ( - 802.54 KJ/mol )( 2 mol CH4 )
⇒ ΔH°c = - 1605.08 KJ
Answer:
C on Edge
Explanation:
The neutron was not discovered until 1932, more than thre
of the electron. Which of the following best explains why e
deduce the existence of the neutron?
ed until 1932, more than three decades aller
ng best explains why earlier scientists were unable to
A
The heavy mass of the nucleus meant that it was difficult to quantity
B
The neutron is a tiny, massless particle that is difficult to observe.
C
Atoms contain varying numbers of neutrons, therefore an average had to be
calculated.
D
The neutron has a neutral charge, which made it impossible to discover using
previous experiments with positive and negative charges.
Answer:
Correct option is D) The neutron has a neutral charge, which made it impossible to discover using previous experiments with positive and negative charges.
Explanation:
The protons are the positively charged particles of an atom. The electrons are the negatively charged particles of an atom. As both the particles carry some kind of charge i.e either positive or negative, hence their discovery was easier.
The neutrons are the part of an atom which are neutral and do not carry any charge. Hence, their discovery took a more longer time as compared to the discovery of electrons and protons.
how many moles are in 4.99x1032 molecules of H2o
Answer:
n≈8,29×10⁸ moles
Explanation:
Nᴀ=6.02×10²³ (constant)
n=N/Nᴀ=
[tex] = \frac{ {4.99 \times 10}^{32} }{6.02 \times 10 ^{23} } = 828903654 [/tex]
≈8,29×10⁸ moles
What is the formula unit for an ionic compound
containing only barium (Ba) and sulfate (SO4) ions?
They escape of dissolved oxygen from the ocean into the atmosphere allowed the ozone layer to form true or false
Answer:
True
Explanation:
The formation of ozone molecules from oxygen molecules is quite a complex radical mechanism, besides, it usually involves the radicals of other gases present in the atmosphere.
Sunlight promotes the formation of these radicals and this is true that in the atmosphere, oxygen is converted into ozone by the following net reaction:
[tex]3 O_2 (g) \rightarrow 2 O_3 (g)[/tex]
The oxygen molecules present in the ocean may have enough kinetic energy to escape the surface of the ocean and reach the atmosphere. When sunlight is used, this conversion from oxygen to ozone becomes possible.
A sample of copper with a mass of 63.5g contains 6.02 x10^23 atoms calculate the mass of an average copper atom
Answer:
The mass of an average copper atom is [tex]1.0548\times 10^{-22}\ g[/tex]
Explanation:
Given:
The total mass of copper atoms, [tex]m = 63.5\ g[/tex]
Number of atoms, [tex]N=6.02\times 10^{23}[/tex]
Now, we are asked to find the mass of 1 copper atom.
We use unitary method to find the mass of 1 copper atom.
Mass of [tex]N[/tex] atoms = m
∴ Mass of 1 atom = [tex]\frac{m}{N}[/tex]
Plug in 63.5 for 'm', [tex]6.02\times 10^{23}[/tex] for 'N' and simply.
Mass of 1 atom = [tex]\dfrac{63.5}{6.02\times 10^{23}}=1.0548\times 10^{-22}\ g[/tex]
Therefore, the mass of an average copper atom is [tex]1.0548\times 10^{-22}\ g[/tex]
The mass of an average copper atom is approximately 1.055 x 10^-22 g.
Explanation:To calculate the mass of an average copper atom, we can use the given information that a sample of copper with a mass of 63.5 g contains 6.02 x 10^23 atoms. We can set up a proportion with the mass and the number of atoms:
63.5 g / 6.02 x 10^23 atoms = x g / 1 atom
Solving for x, we find that the mass of an average copper atom is approximately 1.055 x 10^-22 g.
Metallic Properties: Copper is a metal, and as such, it exhibits typical metallic properties. It is a good conductor of electricity and heat, has a metallic luster, is malleable and ductile, and forms positive ions (Cu^+) in chemical reactions.
Oxidation States: Copper can exist in different oxidation states, with the most common ones being +1 (cuprous) and +2 (cupric). The oxidation state depends on the specific chemical environment.
Density and Melting Point: The density of copper is approximately 8.96 grams per cubic centimeter, and it has a melting point of about 1,984 degrees Celsius (3,603 degrees Fahrenheit).
These characteristics contribute to the overall understanding of the behavior and properties of a typical or average copper atom. Keep in mind that specific conditions, such as temperature and pressure, can influence certain properties of atoms and elements.
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Um...idk...would it be D?
Answer:
yes it would be D. because passive prostheses are lightweight and don't have active movement
Explanation:
A process through which an entire room could be warm by turning on the oven and opening the oven door is
A. Radiation
B. Conduction
C. Convection
D. Brownian motion
If you could answer and explain why that is the answer that would be great, if not it’s fine :)
Final answer:
The warming of a room by an oven is because of convection, which is the movement of warm air that distributes heat throughout the space. Conduction occurs during direct contact with the heat source, while radiation happens when heat travels through a vacuum or air without the necessity for a medium. So the correct option is C.
Explanation:
The process through which an entire room could be warmed by turning on the oven and opening the oven door is convection. This is because convection is the heat transfer by the macroscopic movement of a fluid, which in this case, is the air in the room. As the oven heats the air close to it, this warm air rises and cooler air moves in to take its place, setting up a circulation pattern that distributes the heat throughout the room.
Latent heat is transferred into the air by none of the above options, as latent heat is associated with phase changes, such as water evaporating or condensing, not directly with convection, conduction, or radiation.
Heat transfer by circulation of a fluid is called convection. In the case of heat transfer from a fire or the Sun, where there is no material medium, radiation is the form of heat transfer. Lastly, when there is direct contact between the source and an animal, the method of heat exchange that occurs is conduction.