Chemical Reactions

If you had 25 grams of water and decomposed the liquid water into two gases (hydrogen and oxygen), what would the total mass of the gases be after the reaction?

• 50 grams

• 25 grams

• 12.5 grams

• 75 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What side of the equation is the reactants?

• Left

• Right

What side of the equation are the products?

• Left

• Right

Tags

NGSS.MS-PS1-5

Which of these is not a sign that a chemical reaction has taken place?

• Change in taste

• Change in color

• Change in odor

• Change in energy

Tags

NGSS.MS-PS1-2

An exothermic reaction has a temperature decreased and an endothermic reaction has a temperature increased.

• True

• False

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A chemically activated ice pack is an example of an ________.

• Endothermic Reaction

• Exothermic Reaction

Tags

NGSS.MS-PS1-4

When Calcium Chloride is mixed with water, the temperature starts to increase. This is an example of an __________.

• Exothermic Reaction

• Endothermic Reaction

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

A subscript tells you ________.

• The number of molecules

• How many atoms of the element before it

There are __ different elements in this formula.

• 1

• 2

• 3

• 6

Tags

NGSS.MS-PS1-1

How many total atoms of Oxygen are there in this formula?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1