Chemical Reactions

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂ --> 2Al₂ O₃

• 2

• 6

• 1

• 4

Tags

NGSS.MS-PS1-1

What does the Law of Conservation of Mass state?

• Matter cannot be gained or lost in a chemical reaction.

• Matter can only be lost in a chemical reaction.

• Matter can only be gained in a chemical reaction.

• Matter can be gained and lost in a chemical reaction. 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled

• the product is half the mass of the reactants

• the mass is the same

• the mass changes depending on the reaction

Tags

NGSS.MS-PS1-5

a copper penny turning greenish after a few years.

• Chemical Change

• Physical Change

Tags

NGSS.MS-PS1-2

What is the product of a chemical reaction between an acid and a base?

• Salt

• Water

• Both A and B

• Carbon dioxide

Which of the following best describes a chemical reaction?

• A process where substances are mixed but not changed

• A process where substances are changed into different substances

• A process where substances are dissolved in water

• A process where substances are separated by physical means

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which type of chemical reaction involves the breaking down of a substance into two or more substances?

• Synthesis

• Decomposition

• Single replacement

• Double replacement

What is the result of a chemical reaction?

• The starting materials disappear without a trace.

• New substances with different properties from the starting materials are formed.

• The physical state of the starting materials changes.

• The starting materials are recovered unchanged.

Tags

NGSS.MS-PS1-2

What is the result of mixing an acid with a base?

• A salt and water

• B) A gas and water

• C) A salt and a gas

• D) A base and a salt

Tags

DOK Level 2: Skill/Concept

What is the role of chlorophyll in photosynthesis?

• It absorbs sunlight.

• It produces carbon dioxide.

• It converts glucose into energy.

• It transports water from the roots to the leaves.

Tags

NGSS.MS-LS1-6