Reaction Rate Calculations

What is activation energy?

• The minimum amount of energy particles must have for a reaction to take place

• The amount of energy released during a chemical reaction

Tags

NGSS.HS-PS1-4

True or false? The mean rate of reaction can be found by measuring the amount of reactant used over a period of time.

• true

• false

Tags

NGSS.MS-PS1-2

If we used 30g of small marble chips rather than 1x 30g chunk of marble the rate of the reaction...

• The rate of reaction will decrease.

• The rate of reaction will increase.

• The rate of the reaction will be the same.

What is the equation for calculating rate of reaction?

• amount of reactant used divided by time taken

• amount of product formed divided by time taken

• Both these are correct

Tags

NGSS.HS-PS1-5

In standard conditions data for line B was recorded. If we run the reaction again with reactants at lower concentrations, which line of data would likely be recorded?

• A

• B, again

• C

• No reaction occurs

Tags

NGSS.HS-PS1-5

which factor that affect reaction rate is represented?

• Temperature

• Catalyst

• Surface Area

• Concentration

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

What does a horizontal (flat line) on a reaction graph tell us?

• Reaction in slowing down

• Reaction is speeding up

• Reactant has been used up

Tags

NGSS.HS-PS1-5

List 2 different ways we can measure the rate of reaction.

Tags

NGSS.HS-PS1-5

The following equation shows the reaction between calcium carbonate, CaCO₃ and hydrochloric acid, HCl:

CaCO_3(aq) + 2HCl_(aq) → CaCl_2(aq) + CO_{2 (g)­­} + H₂O_(l)

Which of the following is the suitable method to determine the rate of reaction?

• Change in the temperature of the solution with time

• Change in the volume of carbon dioxide gas with time

• Change in the mass of water with time

• Change in the concentration of hydrochloric acid with time

Tags

NGSS.HS-PS1-5

Why does a higher concentration increase the rate of reaction?

• it increases the amount of reactants

• it lowers the activation energy

• it increases the energy of particle collisions

• it increases the frequency of particle collisions

Tags

NGSS.HS-PS1-5