Characteristics of Chemical Reactions

An increase or decrease in _________________and the production of light are both signs that a chemical reaction may have occurred.

• atoms

• temperature

• odor

• molecule

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What is PROOF that a chemical change has occured?

• a new substance with different properties is created.

• you can put the reactants back together

• the substance changes state, solid to liquid or liquid to solid.

Tags

NGSS.MS-PS1-2

A chemical reaction occurs that involves combining 4 atoms of hydrogen with 2 atoms oxygen. After the reaction, how many atoms of each element will there be?

• 4 Oxygen, 8 Hydrogen

• 2 Oxygen, 4 Hydrogen

• 3 Oxygen, 2 Hydrogen

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following statements is true?

• We know combining Substances A and B resulted in a chemical reaction because a gas was formed

• We know combining Substances C and D resulted in a chemical reaction because of the lack of a temperature change

• We know combining Substances A and B resulted in a chemical reaction because of the lack of a temperature change

• We know combining Substances A and B resulted in a chemical reaction because of the lack of a temperature change

Tags

NGSS.MS-PS1-2

How many carbon atoms will be present in the product?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

How many oxygen atoms will be present in the product?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

How many molecules of CO₂ will be present in the product?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

How many molecules of H₂O will be present in the product?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

Using the photo above the items on the left of the arrow are called

• reactants

• products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Using the photo above the items on the right of the arrow are called

• reactants

• products

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5