Rates of Chemical Reactions

Rate of chemical reaction means

• amount of product formed
• speed of reaction
• concentration of reacting particles
• combining reactants with products

Tags

NGSS.HS-PS1-5

A substance that increases speed of chemical reaction without being being changed is called:

• Catalyst
• Acid
• Base
• pressure

Activation energy is required to start a chemical reaction. What is activation energy?

• The maximum amount of energy used
• The minimum amount of energy required to cross the reaction barrier
• The energy of the reactants
• The energy possessed by the products

Tags

NGSS.HS-PS1-4

Increase in temperature of the reactants can do one of the following

• Slow collision frequency
• Allow less effective collision between the particles
• Neutralise the reaction
• increase collision between the particles thus increasing the rate.

Tags

NGSS.HS-PS1-5

To show how surface area affects rate of reaction you will use one of the following methods.

• Add catalyst
• Increase the temperature
• Decrease the pressure of reactants
• Finely divide the reacting substances

To measure the speed of a reaction you will use one of the following equipment.

• Petri dish
• Stop watch
• stirring rod
• Universal indicator

Tags

NGSS.HS-PS1-5

To slow down a chemical reaction you will do one of the following:

• Place the reactants in hot water
• Place the products in ice bath
• Place the reactants in a ice bath
• Keep stirring the reactants with a stirring rod

Tags

NGSS.HS-PS1-5

Reactions that give out heat to the surrounding are classified as one of the following:

• Spontaneous
• Sluggish
• Exothermic
• Endothermic

Tags

NGSS.HS-PS1-4

One of the signs of a chemical reaction taking place is:

• Bubbles are produced in the reacting vessel
• Reactants are not combining
• Products are not forming
• Colour is not changing

Tags

NGSS.MS-PS1-2

One of the following applies to all group one metals

• They are sluggish in their reaction
• They have only one electron in their outermost shell
• They are very dull in their appearance
• They do not react with oxygen or air