CHEMISTRY HIGH SCHOOL

Solids and liquids have both mass and volume, but a gas has only mass.
a. True
b. False

Answers

Answer 1
Answer: True. A gas does not have a definite volume. Therefore, making this statement correct. 
Answer 2
Answer:

Answer:

True. A gas does not have a definite volume. Therefore, making this statement correct.

Explanation:

true

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A 2.0-liter aqueous solution contains a total of 3.0 moles of dissolved NH4Cl at 25°C and standard pressure.Determine the molarity of the solution.
Which of the following is a quemical property ?

Charge is important when covalent bonds form

true
False

Answers

True because they need charge in order to make a covalent bond I just learned that

What is a star's emission spectrum?It is the same as the HR diagram and gives the same information.
It is the fingerprint of all of the colors of light emitted by a star.
It is a graph of all the pollution given off by a star.
It is a graph of the star’s solar flares.

Answers

The right answer for the question that is being asked and shown above is that: "It is the same as the HR diagram and gives the same information." a star's emission spectrum is tat It is the same as the HR diagram and gives the same information.

Which statement describes a chemical property that can be used to distinguish between compound A and compound B?(1) A is a blue solid, and B is a white solid.
(2) A has a high melting point, and B has a low melting point.
(3) A dissolves in water, and B does not dissolve in water.
(4) A does not burn in air, and B does burn in air.

Answers

(4) A does not burn in air, and B does burn in air is your answer. Flammability is a chemical property while the rest of these are physical properties.

Final answer:

The correct option is 4.

The ability of a compound to burn in air is a chemical property and can be used to distinguish between two compounds.

Explanation:

The statement that describes a chemical property which can be used to distinguish between compound A and compound B is: (4) A does not burn in air, and B does burn in air. Physical properties like color, melting point, and solubility (options 1, 2, and 3) are characteristics that can be observed without changing the substance into another substance. On the other hand, a chemical property describes how a substance interacts with other substances, including its flammability. Therefore, the ability or inability of a compound to burn in air would be a chemical property.

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A synthesis reaction is a reaction between at least two compounds in which a. one breaks down into at least two products.
b. a compound is decomposed by an electric current.
c. a compound burns in the presence of oxygen.
d. a new compound is formed.

Answers

Answer: d. a new compound is formed.

Explanation:

1. Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.

Example: Li_2CO_3\rightarrow Li_2O+CO_2

2. Electrolytic decomposition is a type of chemical reaction in which one reactant gives two or more than two products. on passing electric current.

Example: H_2O\rightarrow H_2+(1)/(2)O_2

3. Combustion is a type of chemical reaction in which fuel is reacted with oxygen to form carbon dioxide and water.

Example:  

C_6H_(12)O_6+O_2 \rightarrow CO_2+H_2O

4. Synthesis reaction is a chemical reaction in which two reactants are combining to form one product.

Example: Li_2O+CO_2\rightarrow Li_2CO_3  
D; a new compound is formed (like A + B --> AB)

Why do natural systems like the water in a pond rarely reach thermal equilibrium?

Answers

Final answer:

Natural systems like water in a pond rarely reach thermal equilibrium due to temperature differences and energy transfer limitations.

Explanation:

Natural systems like the water in a pond rarely reach thermal equilibrium due to various factors.

  1. One reason is the presence of temperature differences in different parts of the pond. For example, during the summer, the upper layer of water is warmed by the Sun and doesn't mix with deeper, cooler water, causing thermal stratification.
  2. Another reason is that energy transfer by heat requires a temperature difference. Once the two masses of water in the pond are mixed, there is no more temperature difference left to drive energy transfer by heat and do work.

These factors prevent the pond from reaching thermal equilibrium.

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Which of the following would most likely happen if water did not form hydrogen bonds?A) Water would exist only as a solid.

B) Water would be able to dissolve all ionic compounds.

C) Water would not expand when it freezes.

D) Water would not exist on Earth.

Answers

The hydrogen bond is a secondary bond formed between a hydrogen (attached to an highly electronegative element ,: F, O or N) and another atom of an highly electronegative element ,: F, O or N.

In case of water hydrogen bond helps water

a) to dissolve certain substances which can make hydrogen bond

b) it makes it liquid and room temperature unlike H2S which is a gas at room temperature due to absence of hydrogen bond

c) higher volume and low density of ice as compared to liquid water. Due to hydrogen bond ice forms open cage like structure which increases its volume and decreases its density. Thus water expands on freezing

So in absence of hydrogen bond Water would not expand when it freezes.
Water would not expand when it freezes. 
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