What is the purpose of balancing a chemical equation?

To ensure that the law of conservation of mass is obeyed.

To make the equation look more aesthetically pleasing

To change the chemical properties of the substances involved

To make the equation easier to memorize

In a combustion reaction, what are the reactants and products?

The reactants in a combustion reaction are a fuel and an oxidant, while the products are typically carbon dioxide and water, along with heat and light energy.

The reactants in a combustion reaction are a fuel and a catalyst, while the products are typically nitrogen and oxygen.

The reactants in a combustion reaction are water and carbon dioxide, while the products are typically a fuel and an oxidant.

The reactants in a combustion reaction are a fuel and a reducing agent, while the products are typically sulfur dioxide and nitrogen oxide.

Give an example of a synthesis reaction.

Combination of hydrogen gas and oxygen gas to form water

Combination of carbon dioxide and water to form glucose

Combination of hydrogen gas and nitrogen gas to form water

Combination of sodium chloride and water to form salt

Provide an example of a single displacement reaction.

Zinc metal reacting with hydrochloric acid to form zinc chloride and hydrogen gas

Iron metal reacting with sulfuric acid to form iron sulfate and hydrogen gas

Copper metal reacting with nitric acid to form copper nitrate and oxygen gas

Aluminum metal reacting with hydrochloric acid to form aluminum chloride and hydrogen gas

Give an example of a double displacement reaction.

All of these are examples of DR reactions

What are the signs of a chemical reaction?

Formation of a precipitate, release of gas, change in color, production of heat or light, formation of a new substance

Formation of a gas, change in texture, change in taste

Formation of a solid, change in odor, change in shape

Change in temperature, change in pressure, change in volume

What is the difference between a reactant and a product in a chemical equation?

A reactant undergoes a chemical change, while a product is formed as a result of the chemical change.

A reactant is formed as a result of a chemical change, while a product undergoes a chemical change.

A reactant is a solid substance, while a product is a liquid or gas in a chemical equation.

A reactant and a product are the same thing in a chemical equation.

How do you balance a chemical equation?

By adjusting the coefficients of the reactants and products to ensure that the number of atoms of each element is the same on both sides of the equation.

By adding or removing atoms from the reactants and products

By changing the chemical formula of the reactants and products

By randomly adding coefficients to the reactants and products

What is the purpose of balancing coefficients in a chemical equation?

To ensure the law of conservation of mass is obeyed.

To make the equation look more balanced.

To make the equation easier to understand.

What is the main characteristic of a combustion reaction?

Rapid combination of a fuel with oxygen

Slow combination of a fuel with oxygen

Combination of a fuel with water

No combination of a fuel with oxygen

What happens during a synthesis reaction?

Two or more substances combine to form a new compound.

During a synthesis reaction, the total mass of the reactants decreases.

A synthesis reaction involves the breakdown of a compound into two or more simpler substances.

A synthesis reaction occurs when two or more substances react to produce a gas.

What is the difference between a single displacement and a double displacement reaction?

In a single displacement reaction, one element is replaced in a compound, while in a double displacement reaction, positive ions of two compounds exchange places.

In a single displacement reaction, positive ions of two compounds exchange places, while in a double displacement reaction, one element is replaced in a compound.

In a single displacement reaction, positive ions of two compounds exchange places, while in a double displacement reaction, negative ions of two compounds exchange places.

In a single displacement reaction, negative ions of two compounds exchange places, while in a double displacement reaction, positive ions of two compounds exchange places.

What must be done to this equation for it to be balanced?

change the subscript to 3 in the reactants

change the subscript to 3 in the products

Which of the following examples shows that a chemical reaction has occurred?

Rust forms on a hammer that has been left outside to long.

A rock breaks into smaller pieces when it is struck with a hammer.

A cup of water turns pink when a few drops of red food coloring are added.

A solid is formed when heat is removed from a sample of water.

A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles -

could show that a gas is forming

always rise to the top of a liquid.

are almost always perfectly spherical.

usually burst after a few minutes.

Hydrogen peroxide breaks down to form water and oxygen gas. Which observation is evidence that a chemical reaction has occurred?

The temperature of the solution increases.

The mass of the solution remains the same.

The color of the solution remains clear.

A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?

A yellow solid forms and then settles to the bottom of the beaker.

The level of the substance in the beaker is higher after the other liquid is added.

Small white crystals are left behind in the flask that held the first liquid.

Which of the following is an example that includes evidence of a chemical reaction?

Sugar that is burned gives off an odor and turns brown and then black.

A sample of zinc is placed in water and it settles to the bottom

A solid block of ice is heated and it completely melts into a liquid.

A tomato is placed into a blender and chopped up into smaller pieces.

Evidence of a chemical reactions is anything that shows -

a change in the state of matter

For an investigation a student poured a blue solution of CuSO 4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes. The student inferred that a chemical reaction occurred. What evidence supports this inference?

A dark solid formed on the zinc metal.

The zinc metal remained silver-colored and shiny

The CuSO 4 solution turned blue when the zinc metal was added.

Chemical Reaction Pre

Authored by Ganesh Sawh

Chemistry

9th - 12th Grade

NGSS covered

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55 questions

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is a chemical reaction?

A process in which new substances are formed

A process in which no new substances are formed

A process in which atoms disappear

A process in which atoms change shape

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the Law of Conservation of Matter?

Matter can be created or destroyed

The number of atoms before and after a chemical reaction changes

Atoms can only rearrange themselves in a chemical reaction

Matter can change its properties in a chemical reaction

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is a physical change?

A change in the properties of matter with a chemical change

A change in the properties of matter without any physical change

A change in state of matter where new substances are formed

A change in state of matter where no new substance is formed

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What do chemical engineers and material scientists study chemical reactions for?

To create new elements

To advance space exploration, make medicines, and form new products

To study the properties of matter

To understand the behavior of atoms

Tags

NGSS.HS-PS1-5

NGSS.HS-ETS1-3

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How is a physical change different from a chemical change?

In a physical change, new substances are formed. In a chemical change, new substances are formed

In a physical change, no new substances are formed. In a chemical change, new substances are formed

In a physical change, new substances are formed. In a chemical change, no new substances are formed

In a physical change, no change occurs. In a chemical change, new substances are formed

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How do you know a chemical reaction has happened?

If a new substance is not formed, it has different properties

If a new substance is not formed, it has the same properties

If a new substance is formed, it has the same properties

If a new substance is formed, it has different properties

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Give an example of a chemical change.

Freezing water to form ice

Boiling water to form steam

Melting ice to form water

Steel wool burning, which causes the iron to combine with oxygen and form iron oxide

Tags

NGSS.MS-PS1-2

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Chemical Reaction Pre

What is a chemical reaction?

What is the Law of Conservation of Matter?

What is a physical change?

What do chemical engineers and material scientists study chemical reactions for?

How is a physical change different from a chemical change?

How do you know a chemical reaction has happened?

Give an example of a chemical change.

What is the purpose of balancing a chemical equation?

In a combustion reaction, what are the reactants and products?

What is the general form of a synthesis reaction?

Access all questions and much more by creating a free account

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