Average Reaction Rates

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

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

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

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

List four factors that affects the rate of a reaction

• temperature

• concentration

• surface area

• volume

• catalysts

Tags

NGSS.HS-PS1-5

A temperature increase causes the particles ......

• to slow down

• move faster

• collide higher

• in the right order

Tags

NGSS.HS-PS1-5

How does a catalyst work in speeding up a reaction?

• By lowering the activation energy or reaction

• by giving them more energy

• by making them more available

Tags

NGSS.HS-PS1-5