Answer:
"Freezing point and ability to react with oxygen" are chemical properties
Explanation:
The change of liquid into solid is the freezing point. The melting point is more than the freezing point in certain cases of mixtures for certain organic compounds like fats. As soon as the mixture freezes it becomes solid and which results in change in the composition from the liquid and solid in this way the it drastically reduces the freezing point. The melting point gets higher due to the pressure. This happens due to the release of heat of which results in the rise of temperature to the freezing point .Also the reaction of elements with oxygen which leads to formation of new substance is also an chemical property
what is the key principle behind VSEPR theory
Answer:
Minimizing repulsion by maximizing the bond angles
Explanation:
VSEPR is defined as 'valence shell electron pair repulsion' theory. The key principle is that repulsion of adjacent lone pairs of electrons or the electrons that are shared within a bond creates bond angles.
The bond angles are maximized in order to minimize the repulsion in the most stable geometrical shape of the molecule.
That said, in VSEPR theory we tend to achieve the greatest possible angles between the bonds and lone pair electrons in order to obtain the lowest repulsion between them.
Which shows the correct order of increasing trophic level, from producer to tertiary consumer?
Answer:
Grass, deer, wolf, fungi.
Explanation:
The tropical level of an organism is defined as the position of organism occupied in the food chain. The food chain is starts from tropical level one which is primary producers (such as plants), then move to herbivores (such as deer) in level two, carnivores, (such as wolf) at level three, apex predators in level four (such as lions), and it ends in decomposers such as fungi.
Fungi play important role in ecosystem to help in breakdown of dead organic matter and return nutrients to the soil. Without fungi nutrients cannot cycle in an ecosystem, and causing the breakdown of entire food web.
I NEED HELP ASAP!!! Find the mass of each substance. Show your work.
A. 7.00 mil H202
B. 5.60 mol NaOH
Answer:
A: 238 g
B: 224 g
Explanation:
Data given:
A.
number of moles of H₂O₂ = 7.00 mole
mass of H₂O₂ = ?
B.
number of moles of NaOH = 5.60 mole
mass of NaOH = ?
Solution:
Part A:
Formula will be used
no. of moles = mass in grams / molar mass
As we have to calculate mass of substance
So, rearrange the above equation
mass in grams = no. of moles x molar mass . . . . . . (1)
Molar Mass of H₂O₂ = 2(1) + 2(16)
Molar Mass of H₂O₂ = 2 + 32
Molar Mass of H₂O₂ = 34 g/mol
Put values in equation 1
mass in grams = 7.00 mol x 34 g/mol
mass in grams = 238 g
mass of H₂O₂ = 238 g
_______________________
Part B:
Formula will be used
no. of moles = mass in grams / molar mass
As we have to calculate mass of substance
So, rearrange the above equation
mass in grams = no. of moles x molar mass . . . . . . (1)
Molar Mass of NaOH = 23 + 16 + 1
Molar Mass of NaOH = 40 g/mol
Put values in equation 1
mass in grams = 5.60 mol x 40 g/mol
mass in grams = 224 g
mass of NaOH = 224 g
Flammability is a material’s ability to burn in the presence of
Answer:
Flammability is a material’s ability to burn in the presence of oxygen.
Explanation:
Flammability can be described as the ability of a substance to get ignited. Flammability will lead to fire or combustion. Some substances are highly flammable like Benzene. Other tend to be just flammable. And there are also compounds which will nor be flammable at all as they won't react with oxygen. Examples of these substances include helium, steel or glass.
The flammability of a substance shall be considered a very important aspect when storing or transporting a substance.
who is Adolf Hitler?
Answer: Adolf Hitler was a German politician and he made the Nazi Party. He rose to power when he was the chancellor. He was also a dictator and he caused World War 2 when he invaded Poland September 1, 1939.
Answer: Adolf Hitler created the Nazi Party. He was a dictator and he rose to power when he was the chancellor in 1933 and then Fuhrer in 1934. He was the cause of World War 2 when he had invaded Poland.
*Fuhrer is a German term which means "The Leader".
How can Newton’s laws be experimentally verified?
Answer:
Newton's second law of motion is F = ma, or force is equal to mass times acceleration. Learn how to use the formula to calculate acceleration
Explanation:
Answer:
Newton's laws can be experimentally verified because Newton's second law of motion is F = ma, or force is equal to mass times acceleration. Learn how to use the formula to calculate the acceleration. And so, using the equations and formulas we can use them and verify the laws.
Explanation:
good luck yalls ;P
12. What is the completed balanced reaction for the decomposition reaction shown below?
Ag₂O ?
A. Ag, Ag, +
C. 2Ag,0 - Ag,O, + 0,
B. 2Ag,0 - 4Ag + O,
D. Ag,0 - 2Ag + O
Answer:
2Ag₂O → 4Ag + O₂
Explanation:
Chemical equation:
Ag₂O → Ag + O₂
Balanced chemical equation:
2Ag₂O → 4Ag + O₂
The given reaction is the decomposition of silver oxide. The silver oxide is decomposed into its constituent element silver and oxygen.
Decomposition reaction:
It is the reaction in which one reactant is break down into two or more product.
AB → A + B
This reaction also followed the law of conservation of mass because there are equal number of atoms of all elements on both side of equation.
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
Which state of matter expands when heated and is easy to compress? gas solid liquid
Answer:
gas
Explanation:
The gas molecules are far apart and as such, when heated they gain more kinetic energy thereby colliding with one another and with the wall of the container thereby exerting pressure and also they can be compressed by reducing the distance between between the molecules.
Matter is anything that is made up of atoms. Matter can be solid, liquid or gas. Out of solid, liquid and gas, gas is the matter that expand on heating and compressed on cooling.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Anything around us that can be physically seen and touched are matter.
The intermolecular forces of attraction between the particles is highest in solid and lowest in gas. So, gas can be easily expand by increasing temperature. As the temperature increases the randomness between the particles also increases and hence particles move apart and expand. On decreasing pressure or temperature the randomness of particles decreases and hence particles comes closer and get compressed.
Thus out of solid, liquid and gas, gas is the matter that expand on heating and compressed on cooling
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The solvent in a solution evaporates out over time, leaving behind the solute.
Why is this a mixture?
Select all that apply.
Distillation is a separation method that uses evaporation.
The solution is made up of the solvent and solute.
The solvent and solute are separated by physical means.
The solute does not evaporate because it is heavy.
Answer:
The solution is made up of the solvent and solute.
The solvent and solute are separated by physical means.
Explanation:
Any mixture must have a solvent and solute, or else it can't be classified as a mixture.
Additionally, I took a test and debated between the "distillation" and "physical means" problem, and got the "distillation" one wrong. It does make sense; evaporation is a physical mean through which the solvent is separates from the solute, even if it isn't caused by humans.
The 4th one just sounds absurd, and I would be shocked if it were correct.
which elements have the most similar chemical properties?
a. Be and Mg
b. Ca and Br
c. Cl and Ar
d. Na and P
Answer:
a. Be and Mg
Explanation:
Be (beryllium) and Mg (magnesium) are both found in the alkaline earth metals family (group 2) on the periodic table. Elements in the same family or group have similar properties,
Ca and Br are in groups 2 and 17
Cl and Ar are in groups 17 and 18
Na and P are in groups 1 and 15
Which radioisotope is naturally occurring?
94238Pu
13H
96242Cm
103258Lr
Answer:
I think the answer is 13H
Explanation:
The best known example of a naturally-occurring radioisotope is uranium. All but 0.7 per cent of naturally-occurring uranium is uranium-238; the rest is the less stable, or more radioactive, uranium-235, which has three fewer neutrons in its nucleus.
How could government laws have the most direct impact on water quality?
provide rewards to recycle
provide rewards to use solar power
provide rewards to use liquid-absorbing surfaces
Answer:
provide rewards to use solar power
Explanation:
Using solar power we can avoid bad energy like Coal, oil, natural gas, uranium and water from a dam.
All these kinds of energy producing air pollution, water pollution, or greenhouse gases.
But solar power has some toxic materials, also, using a lot of water to keep and clean solar power. In addition, if we create a solar power near a river or lake may cause damage.
We must think in these factors before to do a solar power.
Help!! us own words, please!!
Question:
Explain the law of conservation of energy. Give a specific example using kinetic and potential energy that shows how energy is conserved.
Answer:
energy can neither be created nor be destroyed but it can only change from one form to another or transfer from one to another object this is the simplest way of understanding the law of conservation of energy. In simple line its the transfer of energy only.
so now the potential energy is the energy that is in stored form while kinetic energy is that energy which an object contain due to any particular motion.
like a ball is thrown in air so the energy through which it goes upward is kinetic energy and for downward movement of ball it need another energy which is potential energy(in the stored form) and by using this energy it goes downward.
15 pts The drop down items have the same options for all sections labeled choose an item
#8
1)0.960 mol CH4
2)1 mol CH4
3)22.4 L CH4
#9
1)1 mol H2O
2)17.99 g H2O
3)2.0 mol H2O
#10
1)22.4 L CO2
2) 2.0 L CO2
3) 1 mol CO2
4)6.02 x 10 23molecules CO2
8) 21.504 liters of gas
9) 122.5 g
10) 6.022*10^23
Explanation:
8)
1 mole= 22.4 liters
to calculate the volume of gas of 0.960 moles of CH4
22.4*0.960/1
= 21.504 liters of gas
9)
2.0 mole*18.02 g/ 1 mole
=122.5 g
10)
2.0 l * 1 mole/22.4 l
6.022*10^23
if the scientist add phenol red to the sulfuric acid solution (pH=0.3) before the acid is added to the ammonium hydroxide the sulfuric acid solution will appear
what is one reason scientists have developed a system to classify organisms
Answer:
The scientist have developed to classify organisms because the living things with similarities can put into groups, which can further make easy to understand the relationship between them.
Explanation:
The scientist have classified organisms in different groups which can make their study easier. In this manner the organisms with same character will be in same group and their relationship and behavior with themselves as well as with others can be studied easily. It will make things less confusing. In this way the inheritance and genetic behavior can also be studied easily. This classification are based on various other categories like structure, function and also relationship with others.
Answer:
'classification allows for better identification of new organisms.'
Explanation:
how many feet are there in58 yards ?
PLEASE MARK BRAINLIEST!
Answer:
To find how many feet their are in 58 yards, you have to multiply 58 yards by 3, because their are 3 ft per yard.
Explanation:
58 * 3 = ?
58 * 3 = 174 feet
Your answer is 174 feet.
I hope this helps!
33. A base is defined as a compound that produces
A. hydroxide ions in solution.
B. hydrogen ions in solution.
C. hydronium ions in solution.
D. sodium ions in solution.
Answer:
A.
Explanation:
A base is a substance that produces hydroxide ions in an aqueous solution.
A base is defined as a compound that produces hydroxide ions in solution (option A).
What is a base?A base in chemistry is a water-soluble compound having bitter taste, that turn red litmus blue, and react with acids to form salts.
Asides the above properties of a base, a base is capable of producing hydroxide ions (OH-) when dissociated in an aqueous solution.
Examples of bases that would dissociate in water to produce hydroxide ions are as follows:
NaOHKOHLiOHCa(OH)₂Therefore, option A is correct.
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The specific heat of zinc is 0.39 J/g*°C. How much energy needed to change the temperature of 34g of zinc from 22°C to 57°C. Is the energy absorbed or released? 464.1 J, absorbed 464.1 J, released 928.2 J, absorbed 928.2 J, released
Answer:
464.1 J absorbed.
Explanation:
Given data:
Specific heat of zinc = 0.39 J/g°C
Mass of zinc = 34 g
Temperature changes = 22°C to 57°C
Energy absorbed or released = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 57°C - 22°C
ΔT = 35°C
Q = m.c. ΔT
Q = 34 g. 0.39 J/g°C. 35°C
Q = 464.1 J
The movement of thermal energy is controlled by _____. the laws of thermodynamics the specific heat of substances the production of greenhouse gases the circulation of the atmosphere
Answer:
I'm pretty sure that the answer is D.
How do you identify the cation and anion in an ionic compound?
Answer:
Based on whether an element is a metal or non-metal, or their charge if given.
Explanation:
Cations are positively charged ions. Elements that are metals become positively charged.
Anions are negatively charged ions. Elements that are non-metals become negatively charged.
To identify the cation and anion in an ionic compound, name the cation first and the anion second without including the word 'ion'. If the cation can have multiple charges, include either the oxidation number according to the Stock system or use -ous/-ic suffixes in the classical system. The formula must reflect a balance of total positive and negative charges to ensure electrical neutrality.
To identify the cation and anion in an ionic compound, you follow specific nomenclature rules. The name of the ionic compound is written with the cation name first, followed by the anion name, without using the word ion for either. For example, to name Ba(NO₃)₂, you would call it barium nitrate, naming the metal barium as the cation followed by the anion nitrate.
When a cation has more than one possible charge, the compound is named either using the Stock system, which includes the cation's oxidation number, or by using the classical system, which includes the Latin-based name of the cation with the suffix -ous or -ic. For instance, FeCl₃ is named iron(III) chloride in the Stock system or ferric chloride in the classical system because iron can have multiple oxidation states.
To determine the correct number of ions for the formula, the overall charge of the compound must be neutral. This means the total positive charge of the cations must balance the total negative charge of the anions. Thus, writing the chemical formula involves deducing the correct ratio of ions so that their charges cancel each other out.
Which of state of matter has no definite shape but does have a definite volume?
A. Liquid B. Gas C. Solid D. Element
ans is A liquid........
Answer:
A.Liquid has no definite shape but does have a definite volume.
Explanation:
Hope it helps
If 325 g of ammonia is used, what amount, in moles, of nitrogen monoxide will be produced in the
following equation: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)?
Answer:
19.12 moles of NO will produced.
Explanation:
Given data:
Mass of ammonia = 325 g
Moles of NO produced = ?
Solution:
Chemical equation:
4NH₃ + 5O₂ → 4NO + 6H₂O
Number of moles of Ammonia:
Number of moles = mass/ molar mass
Number of moles = 325 g/ 17 g/mol
Number of moles = 19.12 mol
Now we will compare the moles of ammonia and NO.
NH₃ : NO
4 : 4
19.12 : 19.12
Thus 19.12 moles of NO will produced.
A reliable source is one that _____.
A. you found online
B. should be copied directly
C. does not need to be cited
D. can be trusted to be accurate
What are the characteristics of cardiac muscle?
Answer:
Cardiac muscle cells are found only in the heart, and are specialized to pump blood powerfully and efficiently throughout our entire lifetime. Four characteristics define cardiac muscle tissue cells: they are involuntary and intrinsically controlled, striated, branched, and single nucleated.
Explanation:
Cardiac muscle is a specialized type of muscle tissue found only in the heart. It has a striated appearance, is under involuntary control, contains intercalated discs for coordinated contraction, and is highly endurance.
Cardiac muscle is a specialized type of muscle tissue found only in the heart. It has unique characteristics that allow it to efficiently contract and relax, enabling the heart to pump blood throughout the body.
Some key characteristics of cardiac muscle include:
Striated appearance: Cardiac muscle has a striped or striated appearance due to the arrangement of contractile proteins.Involuntary control: Unlike skeletal muscle, cardiac muscle is under involuntary control, meaning we cannot consciously control its contractions.Intercalated discs: These structures are found between adjacent cardiac muscle cells and help transmit electrical impulses, ensuring that the heart contracts as a coordinated unit.Endurance: Cardiac muscle is highly resistant to fatigue and can maintain contractions for extended periods of time.Learn more about Characteristics of Cardiac Muscle here:https://brainly.com/question/34360003
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Order the bond angles of the molecules or ions from smallest to largest: O3+, O3, O3-
Answer:
O3+, O3, O3-
Explanation:
O3- has the highest bond angle because it has the highest electro negative value. Increase in electronegativity leads to increase in bond angles so as to minimize interelectronic repulsion between the electrons. Decrease in electronegativity leads to decrease in bond angle because the repulsion is minimized.
In general, the more electronegative an ion is, the larger the bond angle. The more electropositive an ion is, the smaller the bond angle. Hence cations are smaller than anions.
The bond angles of O3+, O3, and O3- can be ordered as O3- < O3 < O3+ from smallest to largest based on electron geometry and electron-electron repulsion.
Explanation:When ordering the bond angles of O3+, O3, and O3- from smallest to largest, we must consider the electron geometry of each molecule/ion. In general, bond angles tend to decrease as the number of non-bonding electron pairs increases, due to the increased electron-electron repulsion.
In the case of O3+, it has fewer non-bonding electron pairs than neutral O3, leading to greater bond angles. O3, or ozone, has a bent molecular geometry, with a bond angle of roughly 117 degrees. O3-, or the ozone ion, has more non-bonding electrons, which will reduce the bond angle.
So, the bond angles would most likely be ordered as follows: O3- < O3 < O3+.
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what is the most active non metallic element in group 16
Oxygen is the most active non-metallic element in Group 16 of the periodic table, also known as the oxygen family. This is primarily due to its small atomic size relative to other elements in the group.
Explanation:The most active non-metallic element in Group 16 of the periodic table is oxygen. Group 16 elements are also known as the oxygen family. These elements become less active as you move down the group due to an increase in atomic size, which contributes to a decrease in electronegativity. Among the members of this group, oxygen has the smallest atomic size, making it the most active nonmetal in this group. Examples of other elements in this group are sulfur, selenium, tellurium, and polonium, but oxygen is significantly more reactive.
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Would it be C???? Please I need help
Answer: option C.
Explanation: aldehyde has a functional group R—CHO
Millikan measured the quantity of charge carried
by an electron. How did he then calculate the
mass of an electron?
Answer:
m = E × Q
And Q = I × t
m = E × I × t
Where m = mass in grams
Q = quantity of electricity in coulomb
I = current in ampere
t = time in seconds
E = electrochemical equivalent of the substance
Explanation:
Mushrooms, bread molds, and yeasts are classified together in the fungi kingdom. Specivic
characteristics are used to classify these organisms. Which of the following is a characteristic
used to classify these organismis as fungi?
A. They are parasites.
B. They are unicelular.
C. They are prokaryotes,
D. They are heterotrophs
Answer:
D They are heterotrophs
Explanation:
All fungi are eukaryotes, and most are muticellular. Only the fungi called yeasts are unicellular. Fungi are heterotrophs.
HOPE THIS HELPS! HAVE A GREAT DAY!! :)
Mushrooms, bread moulds, and yeasts are classified as fungi based on the characteristics of being D. heterotrophs.
Explanation:An important characteristic used to classify mushrooms, bread moulds, and yeasts as fungi is that they are heterotrophs. Heterotrophs are organisms that obtain their nutrients by consuming other organic matter. In the case of fungi, they obtain their nutrients through extracellular digestion, breaking down organic materials externally and absorbing the nutrients.
This is in contrast to autotrophic organisms, which can produce their own food through processes like photosynthesis. Thus, are organisms that cannot produce their own food and rely on consuming other organisms or organic matter. They encompass a wide range of species, from herbivores that eat plants to carnivores that prey on other animals, and even decomposers that feed on dead organic material.
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