Unit 4 - Chemical Reactions

Which is the Law of Conservation of Matter?

• matter cannot be created or destroyed, it only changes form
• matter can be created but it cannot be destroyed, it never changes form
• matter can be destroyed but it cannot be created, it usually just changes form
• matter is an unproven theory created by Hans Geiger

Tags

NGSS.MS-PS1-5

Which number should go in the blank?
_ H₂ + O₂ -> 2 H₂O

• 1
• 2
• 3
• 0

Tags

NGSS.MS-PS1-5

What is the left part of a chemical equation called?
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

What is the right part of a chemical equation called...
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Tags

NGSS.MS-PS1-5

Balance the following:

____ Fe + ____ Cl₂ → ____ FeCl₃

• 1,1,2
• 1,3,1
• 2,2,3
• 2,3,2

Tags

NGSS.MS-PS1-5

a substance that is formed as the result of a chemical reaction

• Product 
• Reactant
• Starters
• Enders

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

the starting materials in a chemical reaction

• Products
• Reactants
• Starters
• Enders

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

In an endothermic reaction, heat is ,,,

• taken in
• given out

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-6

In an exothermic reaction, heat is ...

• taken in
• given out

Tags

NGSS.HS-PS1-4

What is the purpose  of an enzyme?

• give permission for the reaction
• raise activation energy
• speed up reactions
• control how many reactions occur