Assessment: Chemical Reactions

Which of the following is NOT a description of an Endothermic reaction

• The temperature decreases

• Energy is absorbed

• Energy is released

• Takes more energy to break the bonds than is released

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A chemical change occurs because

• The atoms are changing

• A chemical reaction has occurred

• Nothing new is made

• A change in state of matter occurred

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which option below is an example of an Exothermic reaction

• Fireworks

• Photosynthesis

• Cold pack

• Potassium chloride in water

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

In order to get the rate (speed) of a chemical reaction to increase you must

• Get more product particles together more often

• Get more reactant particles together more often

• Get the frequency of reactant molecules to come in contact less often

• Get the frequency of the product molecules to come in contract more often

Tags

NGSS.HS-PS1-5

What does the Law of Conservation of Mass state

• The mass of the reactants must be close to the mass of the products

• The atoms in the reactants will be different than the atoms in the products

• Matter is neither created or destroyed, therefore the number of atoms in reactants will be identical to the number of atoms in the products

• Atoms of the reactants are not rearranged, therefore the number of atoms will be different.

Tags

NGSS.MS-PS1-5

If the mass of one reactant of a chemical reaction was 32 grams and the mass of the second reactant of the same chemical reaction was 8 grams then what would be the mass of the products?

• 40 grams

• 32 grams

• 42 grams

• 8 grams

Tags

NGSS.MS-PS1-5

What are the atoms of each element in this chemical formula 2Na₂SO₄

• 2 Na, 0 S, 4 O

• 2 Na, 1 S, 4 O

• 4 Na, 1 S, 4 O

• 4 Na, 2 S, 8 O

Tags

NGSS.MS-PS1-1

How many atoms of each element on the reactant side of the equation?

• 4 C, 6 H, 14 O

• 2 C, 6 H, 2 O

• 4 C, 12 H, 7 O

• 4 C, 12 H, 14 O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Balance this reaction: ____ Na₃PO₄ + ____ KOH ---> ____ NaOH + ____ K₃PO₄

• 1,3,3,1
• 1,3,2,1
• 2,3,3,1
• 1,1,3,1

Tags

NGSS.MS-PS1-5

Balancing this reaction: ____ CH₄ + ____ O₂ ---> ____ CO₂ + ____ H₂O

• 2,1,3,1
• 1,2,1,2
• 1,2,2,1
• 2,1,1,2

Tags

NGSS.MS-PS1-5