Chemical REactions Review

How does heat speed up a chemical reaction?

• Makes the molecules move slower and collide less

• Makes the molecules spin around

• Makes the molecules move faster and collide more

• Makes the molecules warm and happy

Tags

NGSS.HS-PS1-5

An endothermic reaction

• Absorbs heat from the reaction and makes the temperature go down

• Releases heat into the reaction and makes the temperature go up

Tags

NGSS.HS-PS1-4

An exothermic reaction

• Absorbs heat from the reaction and makes the temperature go down

• Releases heat into the reaction and makes the temperature go up

Tags

NGSS.HS-PS1-4

The products of a chemical reaction are on the

• Left side (Products → Reactants)

• Right side (Reactants → Products)

The reactants of a reaction are on the

• Left side (Reactants → Products)

• Right side (Products → Reactants)

The law of conservation of mass states that

• The mass of a system (reaction) increases from beginning to end

• The mass of a system (reaction) stays the same from beginning to end

• The mass of a system (reaction) decreases from beginning to end

Tags

NGSS.HS-PS1-7

Is this equation balanced? 
(Are there the same amount of H and O atoms on both sides of the equation?)

   $H_2O_2\rightarrow\ H_2O\ +\ O_2$  

• Yes

• No

Tags

NGSS.HS-PS1-7

In the diagram, letter D represents a

• subscript

• coefficient

• product

• equation

In the diagram, letter E represents a

• subscript

• coefficient

• product

• equation

Which are the reactants in the equation shown?

• H₂O and CO₂
• O₂ and CH₄

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5