Which of the following is evidence that a chemical reaction has occurred?

• gas is formed

• salt dissolves in water

• ice melts

• liquid changes to gas

Tags

NGSS.MS-PS1-2

Which of the following is an example of a chemical change?

• evaporation

• condensation

• change in odor

• melting

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How many different elements are in this compound?

CaO

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

3NaCl

How many molecules of sodium chloride?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many atoms of hydrogen?

H₂O

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many atoms of Oxygen in this chemical formula?

Li₂SO₄

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

The type of reaction that releases energy in the form of heat or light is known as -

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

What type of chemical reaction absorbs energy? (feels cold)

• endothermic

• exothermic

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Identify the reactants in this chemical equation.

• H₂ + O₂

• H₂O

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

What are the products of this chemical equation?

• H₂ + O₂

• H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5