Answer:
The molarity is 2M
Explanation:
First , we calculate the weight of 1 mol of NaCl:
Weight 1mol NaCl= Weight Na + Weight Cl= 23 g+ 35, 5 g= 58, 5 g/mol
58,5 g---1 mol NaCl
233,772 g--------x= (233,772 g x1 mol NaCl)/58,5 g= 4 mol NaCl
A solution molar--> moles of solute in 1 L of solution:
2 L-----4 mol NaCl
1L----x0( 1L x4mol NaCl)/4L =2moles NaCl---> 2 M
the reaction AB2C (g) <---> B2 (g) + AC (g) reached equilibrium at 900 K in a 5.00 L vessel. At equilibrium 0.0840 mol of AB2C, 0.0350 mol of B2, and 0.0590 mol of AC were detected. What is the equilibrium constant at this temperature for this system?
Answer:
k = 4,92x10⁻³
Explanation:
For the reaction:
AB₂C (g) ⇄ B₂(g) + AC(g)
The equilibrium constant, k is defined as:
[tex]k = \frac{[B_{2}][AC]}{[AB_2C]}[/tex] (1)
Molar concentration of the species are:
[AB₂C]: 0,0840mol / 5L = 0,0168M
[B₂]: 0,0350mol / 5L = 0,0070M
[AC]: 0,0590mol / 5L = 0,0118M
Replacing this values in (1):
[tex]k = \frac{[0,0070][0,0118]}{[0,0168]}[/tex]
k = 4,92x10⁻³
I hope it helps!
Members of a species can mate with each other and produce
gene pools.
O
B
. fertile offspring.
O
C . variations.
o
D. adaptations.
Answer: fertile offspring
explaination: I turned in my schoolwork and got it ri ght
Gina was given an irregularly shaped piece of metal and was told that the density of the metal was 10 g/cm3. She measured the mass of the piece to be 210 g. What was the volume of the piece of metal Gina was given?
Answer:
The volume of the piece of the metal Gina is found to be 21 [tex]cm^{3}[/tex]
Explanation:
Given density of the metal = 10 g/[tex]cm^{3}[/tex]
Given mass of the piece of the metal = 210 g
Assuming volume of piece of metal to be V [tex]cm^{3}[/tex]
The expression for the density is shown below
[tex]\textrm{Density} = \displaystyle \frac{\textrm{Mass of piece of metal}}{\textrm{Volume of piece of metal}}\\10 \textrm{ g/cm}^{3} = \displaystyle \frac{210 \textrm{ g}}{V} \\V = 21 \textrm{cm}^{3}[/tex]
Volume of the piece of metal = 21 [tex]cm^{3}[/tex]
What can you conclude about the classification of boron
Answer:
Boron is a Metalloid Element
Explanation:
Final answer:
Boron is classified as a metalloid due to its electron configuration and covalent bonding nature, differing from other group 13 elements by not forming a stable B³+ ion and showcasing a range of compounds with multicenter bonding and fractional oxidation states.
Explanation:
Classification of Boron:
Boron is a unique element classified as a metalloid. It shares properties with both metals and nonmetals, which is evident in its covalent bonding patterns and its ability to form compounds such as boranes and organoboranes. Unlike its group 13 counterparts, boron does not form a stable B³+ ion due to high ionization energies. Instead, its chemistry is dominated by covalent bonding. Boron's 2s²2p¹ outer electron configuration results in an electron deficiency, allowing it to form unusual oxidation states, including fractional ones in boron hydrides. Boron is more electropositive than carbon and hydrogen, contributing to its ability to form covalent bonds with a variety of elements, resulting in a vast range of boron compounds.
Though often compared to silicon and carbon due to its covalency and potential for cluster formation, boron distinctively diverges in properties, such as preferring multicenter bonding. Its peculiar chemistry is also highlighted by its capability to adhere to the sextet rule rather than the octet rule, an example being its stable formation with hydrogen (BH).
How can understanding atomic light help astronomers determine what planets are composed of?
The most common method astronomers use to determine the composition of stars, planets, and other objects is spectroscopy. This process utilizes instruments with a grating that spreads out the light from an object by wavelength. This spread-out light is called a spectrum. Every element has a unique fingerprint that allows researchers to determine what it is made of.
The fingerprint often appears as the absorption of light. Every atom has electrons, and these electrons like to stay in their lowest-energy levels. But when photons carrying energy hit an electron, they can push it to higher energy levels. This is absorption, and each element’s electrons absorb light at specific wavelengths related to the difference between energy levels in that atom. But the electrons want to return to their original levels, so they don’t hold onto the energy for long. When they emit the energy, they release photons with exactly the same wavelengths of light that were absorbed in the first place. An electron can release this light in any direction, so most of the light is emitted in directions away from our line of sight. Therefore, a dark line appears in the spectrum at that particular wavelength.
Because the wavelengths at which absorption lines occur are unique for each element, astronomers can measure the position of the lines to determine which elements are present in a target. The amount of light that is absorbed can also provide information about how much of each element is present.
How do the mass and height of an object affect the gravitational potential
energy?
Explanation:
The bigger the mass and the higher the height of the object above earth’s surface, the bigger the potential energy. The potential energy can be evaluated using the formula below;
P.E. = m*g*h, where
m = mass in kilograms,
g = the acceleration due to gravity (9.8 m / s² at the surface of the earth), and
h = height in meters.
From the formula, it is clear that increasing mass, gravity or/and height will give an increased potential energy
How far can a caterpillar, traveling at 0.05 m/s, move in 3 min?
Answer:
9m
Explanation:
Given parameters:
speed of caterpillar = 0.05m/s
time taken to move = 3min
Unknown:
distance covered by the caterpillar = ?
Solution:
Speed is defined as the rate of change of distance with time. It is a scalar quantity that does not measure direction but has magnitude;
Speed = [tex]\frac{distance}{time}[/tex]
Distance = speed x time
We need to convert the given time to seconds;
1 min = 60s
3 min = 60 x 3 = 180s
Input the variables;
distance = 0.05m/s x 180s = 9m
Suppose 50.0 ml of 0.125 M HCl is mixed with 75.0 ml of 0.200 M Ca(OH)2.
a) Calculate the concentration, in moles per liter, of each of the ions present after mixing. Assume that the volumes are additive.
b) Which is greater, moles of H+ or moles of OH-?
c) How much more of the greater one do you have? Determine the concentration.
Answer:
b) Which is greater, moles of H+ or moles of OH-?
Explanation:
suppose 50.0 mL of 0.250 M CoCl2 solution is added to 25.0 mL of 0.350 M NiCl2 solution . ... [2*(50*0.250)+2*(25*0.350)]/75=0.567 M. 0 3 0.
Answer:
b) Which is greater, moles of H+ or moles of OH-?
Explanation:
Have a great day
What would happen to Earth’s tides if the distance between Earth and the Moon increased?
Answer:
The tides wouldn't go sicko mode
Explanation:
The tides would be weaker, hence no sicko mode
4 Sodium metal, Na, reacts with water to form a solution of
sodium hydroxide, NaOH, and gives off hydrogen gas, H.
Write a balanced symbol equation, including state symbols,
for this reaction.
Answer:
2Na(s) + 2H2O(l) ---> 2NaOH(aq) + H2(g)
Explanation:
In the reaction above, solid pieces of sodium metal, Na, is dissolved in liquid water to form a solution of its alkali
(sodium hydroxide, NaOH) and gives off hydrogen gas, H.
The reaction occurs vigorously giving off hydrogen gas due to the highly reactive nature of alkali metals like sodium with water.
If heat flows out of a system, the heat change (AH) will be
, and the reaction will be
Answer: Heat change will be negative and reaction is exothermic.
Explanation:
In any system that involves heat flowing out of the system, (that is heat loss), the heat change will be negative and the reaction will be exothermic.
A sample of an unknown compound contains 0.350 moles of sulfur and 1.05 moles of oxygen. The molecular mass of the compound is 240.18 g/mol. What is the molecular formula of this compound?
Answer:
true
Explanation:
How many moles of glucose are in 19.1 g of glucose?
Answer:
The mole of glucose is 0.106mol
Explanation:
Glucose - C6H12O6
We will calculate the molar mass of glucose
C - 12
H - 1
O - 16
6 moles of carbon, 12 moles of hydrogen and 6 moles of oxygen
Mm = 6 * 12 + 12 * 1 + 16 * 6
= 72 + 12 + 96
= 180g/mol
Using the formula
n = m/Mm
n - number of mole
m - number of mass
Mm - number of molar mass
n = 19.1g/180g/mol
= 0.106g/mol
light energy from the sun is converted into what kind of energy by green leaves?
How the relative density of a substance is related to the density calculate the density of iron if its relative density is 2 and a density of water is 2gcm -3
Answer:
How the relative density of a substance is related to the density calculate the density of iron if its relative density is 2 and a density of water is 2gcm -3
R.d= relative density of substance/ relative density of water
R.d= 2/2
R.d= 1gcm-3
Explanation:
Density of water=1000 kg/m^3. Relative density= density of substance/density of water. Relative density=7800/1000=7.8 · The radius of a solid sphere is 2 cm.
The relative density can be calculated directly by measuring the density of the sample and dividing by the (known) density of the reference substance. The density of a sample divided by its volume is the relative density of the sample, also known as specific gravity. The relative density of a substance is a pure number that has no units. It tells how many times a substance weighs more than water. The relative density (R.D) of a substance is calculated by dividing the density of a substance by the density of water. The relative density of a substance is the ratio of the density of the substance to that of water. And since it is the ratio of density to density. Hence, it is singular
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What is the balancing equation of Sn + NaOH Na2SnO2 + H2
Answer:
Chemical Equation Balancer Sn + NaOH = Na2SnO2 + H2.
Explanation:
Answer:
Chemical Equation Balancer Sn + NaOH = Na2SnO2 + H2.
Explanation:
got it right on a test/assignment i had :)
Which activities describe the use of technology in science? Check all that apply.
looking at cells through a microscope
viewing stars through a telescope
observing a plant with the unaided eye
creating a blank data table by hand in a notebook
developing a computer model for earthquakes
The activities describe the use of technology in science is as follows:
looking at cells through a microscopeviewing stars through a telescopedeveloping a computer model for earthquakesThe use of technology in science involves various activities that enhance observation, data collection, analysis, and modeling. The activities that describe the use of technology in science include:
1. Looking at cells through a microscope: Microscopes are essential technological tools that enable scientists to observe and study microscopic structures, such as cells and microorganisms.
2. Viewing stars through a telescope: Telescopes are advanced optical instruments that allow astronomers to study distant celestial objects, stars, galaxies, and other astronomical phenomena in detail.
3. Developing a computer model for earthquakes: Creating computer models using specialized software and simulations is a crucial aspect of scientific research, particularly in fields like seismology, where scientists model earthquake behavior to understand and predict seismic activity.
Activities that do not directly involve technology include:
1. Observing a plant with the unaided eye: This activity relies solely on natural vision without the use of technological instruments.
2. Creating a blank data table by hand in a notebook: While this activity may involve manual recording, it doesn't necessarily involve the use of advanced technology. However, the data recorded in these tables can later be processed using technology.
In summary, the use of technology in science is evident in activities that rely on advanced tools and instruments, data analysis software, and computer modeling to enhance scientific research and understanding.
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e the letters of the correct answers on the lines at left.
1.
it kinds of mixtures at school. While
lan has been learning about different kinds of mixtures at so
he was helping prepare dinner for his family, he noticed that some o
the food they were making were different kinds of mixtures. What kind
of mixture was their dinner if they were having spaghetti and meatballs
A. heterogeneous
B. homogeneous
C. solute
D. suspension
Suspension mixture was their dinner if they were having spaghetti and meatballs. The right option is D.
Explanation:
Properties of suspension mixture are:
Bigger particles are seen in suspension, and they are visible by naked eye.
Suspension is a heterogenous mixture of either two or more substances.
Solute particles are not dissolved in solvent instead they are suspended as it is or in bulk.
Exhibits Tyndall effect.
Solid particles get sedimented easily.
A mixture of spaghetti and meatballs are suspension because two paricles are not dissoved, and they have separate phases on sphagetti and meat ball where liquid in meat ball drizzles to bottom and meatball remians on top.
1. A 1.0-gram sample of powdered Zn reacts faster with HCl than a single 1.0-gram piece of Zn because
the surface atoms in powdered Zn have
(1) higher average kinetic energy
(2) lower average kinetic energy
(3) more contact with the H+ ions in the acid
(4) less contact with the H+ ions in the acid
A 1.0-gram sample of powdered Zn reacts faster with HCl than a single 1.0-gram piece of Zn because the surface atoms in powdered Zn have more contact with the H⁺ ions in the acid.
Hence, Option (C) is correct answer.
What is Zinc ?Zinc is a chemical element. The atomic number of Zinc is 30. Zinc belongs to period 4 and group 12 in the periodic table. Zinc is a transition metal.
What is HCl ?HCl is Hydrochloric acid. It is a nonflammable gas. Hydrochloric acid is also called muriatic acid. It is a strong corrosive acid. HCl is also known as hydrogen chloride.
Thus from the above conclusion we can say that A 1.0-gram sample of powdered Zn reacts faster with HCl than a single 1.0-gram piece of Zn because the surface atoms in powdered Zn have more contact with the H⁺ ions in the acid.
Hence, Option (C) is correct answer.
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Final answer:
Powdered Zn reacts faster with HCl compared to a single piece because it has more contact with the H+ ions, allowing for more collisions and faster reaction rates due to increased surface area.
Explanation:
A 1.0-gram sample of powdered Zn reacts faster with HCl than a single 1.0-gram piece of Zn because the surface atoms in powdered Zn have more contact with the H+ ions in the acid. This increased contact area allows for more collisions and interactions between the Zn atoms and HCl, which results in a faster reaction rate. In a powdered form, zinc has a greater surface area exposed to the acid, leading to an increase in reaction rate compared to a single piece of zinc, which has a limited surface area exposed.
When zinc reacts with hydrochloric acid, a single displacement reaction occurs, producing hydrogen gas and an aqueous solution of zinc chloride. The balanced equation for the reaction is Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq). In this reaction, zinc transfers electrons to hydrogen atoms (protons), resulting in the formation of hydrogen gas. Increased surface area from the powdered form increases the number of these electron transfer events, thus increasing the reaction's rate.
(Number three) how do you solve this problem?
Answer:
Mg = 3
P = 2
O = 8
Explanation:
Mg3(PO4)2
Multiplying through by the number outside the bracket, we obtained
Mg3P2O8. From this, we can easily find the number of atoms of each element present as illustrated below:
Mg = 3
P = 2
O = 8
What is the equation used to calculate momentum
p=mv
where p = momentum
m = mass
v = velocity
a mug of boiling hot water sits next to a glass of ice water how does the movement of water molecules change in each case?
Answer: In the hot cup, they would be moving super fast, while in the cold cup they would just be fast.
Explanation:
Solids are stagnant, while liquids molecules are fast.
Given the following equation: Zn + 2HCI - H2 + ZnCl2
How many moles of HCl are needed to react with 0.50
moles of Zn?
Answer:
To react with 0.5 moles of Zn 1 mole of HCl is required
Explanation:
Given data:
Number of moles of Zn = 0.50 mol
Number of moles of HCl = ?
Chemical equation:
Zn + 2HCl → H₂ + ZnCl₂
Now we will compare the moles of Zn and HCl through balance chemical equation.
Zn : HCl
1 : 2
0.50 : 2×0.5 = 1 mol
In order to react with 0.5 moles of zinc 1 mole of HCl is required.
Final answer:
To react with 0.50 moles of Zn, following a 1:2 molar ratio based on the provided equation, 1.0 mole of HCl is required.
Explanation:
The question you've asked is about how many moles of hydrochloric acid (HCl) are needed to react with 0.50 moles of zinc (Zn), based on the chemical equation: Zn + 2HCl → H2 + ZnCl2. From this equation, it's clear that zinc reacts with hydrochloric acid in a 1:2 molar ratio, meaning that for each mole of zinc, two moles of HCl are required for the reaction to proceed to completion.
Therefore, to react with 0.50 moles of Zn, you need 2 * 0.50 = 1.0 mole of HCl.
convert Gas pressure from 12.02 psi to pressure in kPa
Answer: 82.9kPa
Explanation:
Gas pressure can be measured in several units, they include psi (pound per square inch), kPa (kilo pascal).
Recall that:
1 Kilopascal (kPa) = 0.14503773779 psi
So, let Z kPa = 12.02 psi
To get the value of Z, cross multiply
12.02 psi x 1kPa = 0.14503773779 psi x Z kPa
12.02 = 0.14503773779Z
Divide both sides by 0.14503773779
12.02/0.14503773779 = 0.14503773779Z/0.14503773779
82.9 kPa = Z
Thus, the 12.02 psi is equivalent to 82.9 kPa
Final answer:
To convert 12.02 psi to kPa, multiply it by the conversion factor of 6.89476, giving 82.914 kPa.
Explanation:
The student is asking to convert gas pressure from psi to kPa, which involves using a conversion factor. The value in psi needs to be multiplied by the conversion factor to find the equivalent pressure in kPa. According to the given information, 1 psi is approximately equal to 6.89476 kPa.
To perform the conversion from 12.02 psi to kPa:
Multiply 12.02 psi by the conversion factor of 6.89476 kPa/psi.
12.02 psi imes 6.89476 kPa/psi = 82.914 kPa.
So, the pressure of 12.02 psi can be converted to 82.914 kPa.
Convert 7.50 grams of glucose C6H12O6 to moles
Answer:
0.04167mole
Explanation:
To convert gram to mole,
C6H12O6
C - 12
H - 1
O - 6
There are 6 moles of C, 12 mole of H and 6 mole of O
Therefore, multiply each number of mole by the mass of each element
C - 12 * 6 = 72
H - 1 * 12 = 12
O - 16 * 6 = 96
The molar mass of C6H12O6 = 72 + 12 + 96
= 180g/mol
Dividing the number of mass by the mm
= 7.50g / 180g/mol
= 0.04167 mole
What volume of solution gives the desired moles?
0.53mol from a 7.25M solution
0.035mol from a 1.25M solution
0.0013mol from a 0.090M solution
Answer:
1. 0.073L
2. 0.028L
3. 0.014L
Explanation:
The volume for the different solutions are obtained as shown below:
1. Mole = 0.53mol
Molarity = 7.25M
Volume =?
Molarity = mole /Volume
Volume = mole /Molarity
Volume = 0.53/7.25
Volume = 0.073L
2. 0.035mol from a 1.25M
Mole = 0. 035mol
Molarity = 1.25M
Volume =?
Molarity = mole /Volume
Volume = mole /Molarity
Volume = 0.035/1.25
Volume = 0.028L
3. Mole = 0.0013mol
Molarity = 0.090M
Volume =?
Molarity = mole /Volume
Volume = mole /Molarity
Volume = 0.0013/0.090
Volume = 0.014L
4. In a crystal, the particles are arranged in
A ball-like shapes of varying sizes
B sheets or layers that can separate from one another
C an orderly, repeating, three-dimensional pattern
D a random pattern that does not repeat
The correct answer is C
In a crystal, the particles are arranged in an orderly, repeating, three-dimensional pattern.
Option C
Explanation:
Solid crystal particles can be ions, molecules or atoms, based on the material kind. The three-dimensional solid crystal system is called the crystal lattice. The crystals are divided into general categories according to their shape.
The crystal is characterized by faces that intersect at specific angles characteristic of this material. Crystal is a material in which particles get arranged in an ordered, repeatable, three-dimensional way. Means, a solid contains an atomic patterns that is uniformly repeated in three dimensions.
Do you think precipitation has a greater impact on the rate of chemical weathering or mechanical weathering ?
Answer:
Chemical weathering.
Explanation:
Chemical weathering has more to do with weathering things with acid, water, and air. Mechanical weathering happens without water most of the time. Yes they both have water weathering but Chemical weathering has a higher rate of impact.
Precipitation greatly impacts both mechanical and chemical weathering, but due to its role in driving chemical reactions, it is generally more impactful on the rate of chemical weathering. Other factors, including climate, temperature, and biological activity, also influence precipitation's effects on weathering.
Explanation:Precipitation can have a great impact on both mechanical and chemical weathering, but the extent of its impact depends on other factors such as temperature and wind. For example, in the context of climate, temperature, moisture, and wind shape different patterns of weathering. Mechanical weathering can be accelerated by moisture as it causes expansion and contraction in rocks, while chemical weathering often occurs when moisture combines with substances in the atmosphere to produce acids that can break down rock over time.
The role of precipitation is also evidenced in chemistry. The process of selective precipitation is used to remove contaminants from wastewater before it's released back into natural water bodies. Further, precipitation reactions in nature can lead to the formation of solid products through a process called metathesis reactions. So, while precipitation indirectly contributes to mechanical weathering, its role in driving chemical reactions that can lead to chemical weathering is more direct and thus it generally has a greater impact on the rate of chemical weathering.
The impact of precipitation can also be seen in biology. Changing conditions such as temperature and precipitation affect the geographic distribution and phenology of plants and animals. For example, moisture levels affect the biological activity in soil, promoting the development of microorganisms and the decomposition of plant materials, which can contribute to soil weathering.
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Which gas in the Earth's atmosphere turns into precipitation?
A) Oxygen
B) Hydrogen
C) Nitrogen
D) water vapor
Answer:
D) water vapor
Explanation:
Materials can be classified as solids liquids or gases based on whether their shapes and ______ are definite or variable
Answer:
Materials can be classified as solids, liquids, or gases based on whether their shapes and volumes are definite or variable. LIQUIDS: Have a definite volume but change shape · Particles are close together, but not held as tightly as a solid.
Explanation: