Chemical Reactions

In a ___________change, a substance changes into a different substance.

• Physical
• Chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these is NOT a sign that a chemical change has occurred? 

• A loss of transparency 
• An unexpected color change
• A temperature change
• The formation of a precipitate

Tags

NGSS.MS-PS1-2

___________________ are the elements are compounds that leave (are formed in) a chemical
reaction.

• Polymers
• Bonds
• Reactants
• Products

Tags

NGSS.MS-PS1-2

In this image, what are the information in red is called the_______.

• Product
• Reactant
• Chemical Subscript
• Yield

Tags

NGSS.HS-PS1-7

In this image, what are the information to the right of the arrow (in black) is called the_______.

• Product
• Reactant
• Chemical Subscript
• Yield

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

What happens to an enzyme when it denatures?

• The activation energy of the reaction is doubled.

• The activation energy of the reaction is lowered.

• It's optimal conditions for temperature of the enzyme are doubled.

• The shape of the enzyme molecule is changed.

The energy needed to start a reaction

• activation energy
• adhesion energy
• chemical energy
• cohesion energy

Enzymes need certain environmental conditions in order to function properly.  What happens when enzymes are heated to a high temperature?

• they die
• they denature
• they change their amino acid sequence
• they work better

Which is the chemical formula for hydrogen peroxide?

• H₂O₂

• H₂O

• O₂

• HPO₂

Tags

NGSS.MS-PS1-1

What was the name of the gas given off in this reaction?

2H₂O₂ ---> 2H₂O + O₂

• Water

• Liver

• Catalase

• Peroxide

• Oxygen

Tags

NGSS.MS-PS1-2