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 unrelated to 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 greater than 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 increase the speed of the reaction.

To make the equation look neat.

To change the products of the reaction.

Fill in the blank: The purpose of changing the coefficients in a chemical equation is to .

modify the physical state of the products.

alter the temperature of the reaction

change the chemical identity of the reactants

balance the equation by adjusting the number of molecules

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 unbalanced equation has more water molecules.

The number of hydrogen atoms is the same in both.

The balanced equation has more oxygen atoms.

What happens when hydrochloric acid is dropped on limestone?

A chemical reaction occurs that produces a gas.

What are the general types of chemical reactions?

Synthesis, decomposition, single-replacement, double-replacement, combustion

Photosynthesis, respiration, oxidation, reduction, hydrolysis

Fusion, fission, polymerization, crystallization, sublimation

Neutralization, precipitation, electrolysis, fermentation, distillation

How are chemical reactions often classified?

By the type of reactant or the number of reactants and products

By the temperature at which they occur

What is a synthesis reaction?

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

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

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

A reaction where energy is absorbed from the surroundings.

What happens when electricity passes through water?

Water decomposes into hydrogen gas and oxygen gas.

What is a single-replacement reaction?

A reaction where one element takes the place of another element in a compound.

A reaction where two elements combine to form a compound.

A reaction where two compounds exchange elements.

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

What causes the hydrogen gas to ignite explosively in the reaction between potassium and water?

The heat produced by the reaction

What is a double-replacement reaction?

A reaction where two compounds exchange positive ions and form two new compounds.

A reaction where two elements combine to form a single compound.

A reaction where a single compound breaks down into two or more elements.

A reaction where an element replaces another in a compound.

What is the relationship between 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

The mass of the reactants is greater

The mass of the products is less.

What does a balanced equation show?

To show that mass is conserved during a reaction

To show that energy is conserved

To show that volume is conserved

To show that temperature is conserved.

Physical Science Fall 24 Test

Authored by Kyle Wooten

Science

12th Grade

NGSS covered

Used 2+ times

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78 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of change is burning classified as?

Biological change

Physical change

Chemical change

Mechanical 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?

It becomes a gas

It turns into a liquid

A chemical reaction takes place

It remains the same

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 only created in a chemical reaction.

Mass is neither created nor destroyed in a chemical reaction.

Tags

NGSS.MS-PS1-5

DRAG AND DROP QUESTION

30 sec • 1 pt

Fill in the blank: The substances that undergo change in a chemical reaction are called (a) .

Enzymes

Reactants

Products

Catalysts

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE SELECT QUESTION

30 sec • 1 pt

What is the product formed when charcoal burns in the presence of oxygen?

Carbon monoxide

Methane

Carbon dioxide

Water

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

C + O₂ → CO₂

C + O₂ → CH₄

C + O₂ → CO

C + O₂ → H₂O

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does a chemical equation represent?

A biological process

A representation of a chemical reaction

A mathematical formula

A physical change in matter

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-1

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