What does a chemical equation represent?

A representation of a chemical reaction

How can the equation C + O₂ → CO₂ be read?

Carbon and oxygen react and form carbon dioxide

Carbon and hydrogen react to form methane

Carbon dioxide decomposes into carbon and oxygen

What does the law of conservation of mass state about chemical reactions?

The mass of the products is equal to the mass of the reactants.

The mass of the products is less than the mass of the reactants.

The mass of the products is unrelated to the mass of the reactants.

The mass of the products is greater than the mass of the reactants.

When charcoal burns, what is the relationship between the mass of carbon dioxide produced and the mass of the charcoal and oxygen that reacted?

The mass of carbon dioxide is equal to the mass of charcoal and oxygen.

The mass of carbon dioxide is greater than the mass of charcoal and oxygen.

The mass of carbon dioxide is less than the mass of charcoal and oxygen.

The mass of carbon dioxide is unrelated to the mass of charcoal and oxygen.

What remains constant in the chemical equation for burning carbon, regardless of the number of carbon atoms?

The equation used to describe the reaction

The temperature of the reaction

Why must chemical equations be balanced?

To show that mass is conserved during a reaction.

To change the products of the reaction.

To make the equation look neat.

To increase the speed of the reaction.

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

To balance the equation by adjusting the number of molecules

To alter the temperature of the reaction

To change the chemical identity of the reactants

To modify the physical state of the products

What happens when you change a coefficient in a chemical equation?

The amount of the reactant or product changes

The equation becomes unbalanced

The chemical formula of the reactant changes

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

To balance the equation by adjusting the number of molecules

To alter the temperature of the reaction

To change the state of matter of the products

To change the chemical identity of the reactants

What is the main difference between an unbalanced and a balanced chemical equation for the reaction of hydrogen and oxygen to form water?

The balanced equation has equal numbers of each type of atom on both sides.

The number of hydrogen atoms is the same in both.

The unbalanced equation has more water molecules.

The balanced equation has more oxygen atoms.

What is true about the mass of products and reactants?

The mass of the products is equal to the mass of the reactants

The mass of the products is greater than the mass of the reactants

The mass of the products is less than the mass of the reactants

The mass of the products is double the mass of the reactants.

Why is a chemical equation balanced?

To show that mass is conserved during a reaction

To show that energy is conserved during a reaction

To show that volume is conserved during a reaction

To show that temperature is conserved during a reaction.

How is a chemical equation balanced?

By adjusting the number of molecules

What is a synthesis reaction?

A reaction in which two or more substances react to form a single substance.

A reaction where energy is absorbed from the surroundings.

A reaction where a single substance breaks down into two or more substances.

A reaction that involves the exchange of ions between two compounds.

What is a decomposition reaction?

A reaction where a compound breaks down into two or more simpler substances.

A reaction where two elements combine to form a compound.

A reaction where a compound is formed from simpler substances.

A reaction where energy is absorbed.

Physical Science Chapter 7 Review

Authored by Kyle Wooten

Science

12th Grade

NGSS covered

Used 3+ times

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57 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of change is burning classified as?

Biological change

Chemical change

Mechanical change

Physical change

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What occurs when a substance undergoes a chemical change?

A chemical reaction takes place

It becomes a gas

It remains the same

It turns into a liquid

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the law of conservation of mass state?

Mass is created and destroyed in a chemical reaction.

Mass is only destroyed in a chemical reaction.

Mass is neither created nor destroyed in a chemical reaction.

Mass is only created in a chemical reaction.

Tags

NGSS.MS-PS1-5

MULTIPLE SELECT QUESTION

30 sec • 1 pt

What are the substances called that undergo change in a chemical reaction?

Enzymes

Reactants

Catalysts

Products

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the new substances formed as a result of a chemical reaction called?

Reactants

Products

Catalysts

Enzymes

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the correct representation of a chemical reaction?

Reactants → Products

Reactants = Products

Products → Reactants

Products = Reactants

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is the chemical equation for the burning of charcoal written in chemical formulas?

C + O₂ → H₂O

C + O₂ → CO

C + O₂ → CO₂

C + O₂ → CH₄

Tags

NGSS.MS-PS1-5

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