ملخص درس سرعة التفاعلات الكيميائية

What factors affect the speed of chemical reactions?

• Temperature

• Concentration

• Surface Area

• Catalysts

What is the relationship between temperature and reaction speed?

• Directly proportional

• Inversely proportional

• No relationship

• Depends on the reaction

What happens to the speed of a reaction when the concentration of reactants increases?

• It decreases

• It increases

• It remains the same

• It becomes unpredictable

Fill in the blank: The speed of a chemical reaction is measured by the (a)   of reactants consumed.

What is the role of catalysts in chemical reactions?

• Speed up reactions

• Slow down reactions

• Change the products

• Increase energy requirements

How does increasing the surface area of a solid reactant affect the rate of reaction?

• It increases the rate

• It decreases the rate

• It makes the reaction slower

• It has no effect

What effect does a decrease in temperature have on the speed of a chemical reaction?

• It has no effect

• It makes the reaction unpredictable

• It increases the speed

• It decreases the speed

Which of the following factors can influence the rate of a chemical reaction?

• Catalysts

• All of the above

• Temperature

• Concentration

Inhibitors

• stops a chemical reaction

• speeds up a chemical reaction

• lowers activation energy

• non of the above

How does temperature, increasing surface area and increasing reactants concentration lead to an increase in the rate of the reaction?

• by decreasing collision between particles

• by increasing collision between particles and reaching activation energy faster

• by decreasing collision to higher activation energy