Rate of reaction (1)

Which of the following reactions produces gas with the highest initial rate?

• 5 g of limestone powder with 25 cm³ of 1 mol dm^-3 hydrochloric acid

• 5 g of limestone pieces with 50 cm³ of 1 mol dm^-3 hydrochloric acid

• 5 g of limestone powder with 25 cm³ of 2 mol dm^-3 hydrochloric acid

• 5 g of limestone pieces with 25 cm³ of 2 mol dm^-3 hydrochloric acid

What do you increase when you crush an alka seltzer tablet?

• Surface area

• temperature

• concentration

• pressure

Tags

NGSS.HS-PS1-5

Which graph shows the highest reaction rate?

• a

• b

• c

• d

Tags

NGSS.HS-PS1-5

Increasing temperature has what effect on reaction rate?

• No effect

• Increasing temperature lowers reaction rate

• Increasing temperature increases reaction rate

• What are you talking about?

Tags

NGSS.HS-PS1-5

In our experiments, what had the biggest effect on reaction rate?

• replacing water with vinegar

• crushing the alka seltzer

• adding extra baking soda

• adding a peppermint

Adding more baking soda increases its....

• concentration

• surface area

• pressure

• temperature

Tags

NGSS.HS-PS1-5

The rate of a chemical reaction is NOT affected by which of the following:

• temperature
• concentration
• particle size (surface area)
• All of these affect reaction rates

Tags

NGSS.HS-PS1-5

A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 

• catalyst
• product
• reactant
• solute

Tags

NGSS.HS-PS1-5

Catalysts permit reactions to proceed along a ___________energy path.

• lower
• higher

Tags

NGSS.HS-PS1-4

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