Rates of Chemical Reactions

How do chemical reactions occur?

• Slowly over time

• Within seconds

• At very different rates

• By mixing chemicals

Tags

NGSS.HS-PS1-5

What are at least TWO variables that affect the rate of a reaction?

• Temperature

• Concentration

• Catalyst

• The elements present

Tags

NGSS.HS-PS1-5

Adding a catalyst ​ (a)   the activation energy.

• lowers
• raises
• stabilizes
• disjoints
• confuses

What does an increase in concentration do to the probability of a productive collision?

• Increases

• Decreases

• Stabilizes

• None of these

Tags

NGSS.HS-PS1-5

Why is the initial rate of reaction investigated?

(CHECK ALL THAT APPLY)

• Because it is easy to determine initial concentrations of reactants

• An equation can be written that relates reaction rate to the initial concentration of all the reactants

• Because it is easy to determine final concentrations of reactants

• Because it is easy to determine initial concentrations of the products

Tags

NGSS.HS-PS1-5

How do you determine the order of each component of the experiment?

• Change the concentration of only one component at a time.

• Change the concentration of two components at a time

• Change the concentration of multiple components at a time

• None of these

Tags

NGSS.HS-PS1-5

The indicator is ​ (a)   for the reaction.

• starch
• sugar
• salt
• unknown

Tags

NGSS.MS-PS1-2

What happens to the indicator for the reaction in the presence of I 2?

• Turns Blue

• Turns Pink

• Turns Red

• Stays clear

What happens to the iodide when it reacts in this experiment?

• It bonds with the reactant

• It vaporizes

• It converts to iodine

• None of these

Tags

NGSS.HS-PS1-1

The slope will be ​ (a)   . The reaction will be ​ (b)  

• negative
• positive

Tags

NGSS.HS-PS1-4

NGSS.HS-PS1-5