Rates of Reaction

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

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

• Red, because the activation energy is larger
• Blue, because the activation energy is lower
• both reaction progress at the same rate

Tags

NGSS.HS-PS1-4

Grinding a seltzer tablet into powder increases the rate of reaction due to increased

• concentration
• surface area
• temperature
• reactants

When we investigate the rate of reaction we are looking at the...

• amount of product formed

• speed of reaction

• concentration of reacting particles

• combining reactants with products

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6

How could we make this reaction happen more quickly?

• Decrease the concentration of the acid

• crush the chalk to increase the surface area

• Put the test tube in an ice bath

Tags

NGSS.HS-PS1-5

P, Q, R and S are pieces of apparatus.

Which row describes the correct apparatus for the measurement made?

• A

• B

• C

• D

What type of reaction is this?

• Endothermic
• Exothermic

Tags

NGSS.HS-PS1-4

In an experiment, a 2 g lump of zinc and 2 g of powdered zinc are added separately to equal volumes of dilute sulphuric acid. The solid line on the graph shows the volume of gas given off when the 2 g lump is used. Which dotted line is obtained when the zinc is powdered? 

• A
• B
• C
• D

Tags

NGSS.HS-PS1-5

A liquid X reacts with solid Y to form a gas.
Which two diagrams show suitable methods for investigating the speed of the reaction? 

• 1 and 3
• 1 and 4
• 2 and 3
• 2 and 4

Tags

NGSS.HS-PS1-5

In which experiment is the rate of reaction between hydrochloric acid and calcium carbonate slowest? 

• A
• B
• C
• D

Tags

NGSS.HS-PS1-5