Rates of Reaction

Rate of chemical reaction means

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

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

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

• Spontaneous
• Sluggish
• Exothermic
• Endothermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

Which factors increase the rate of a reaction.

• increasing temperature
• increasing concentration
• increasing surface area
• all of these

Tags

NGSS.HS-PS1-5

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

Why don't all collisions between particles cause a reaction?

• the particles also need to collide with a catalyst
• not all the particles collide with enough energy
• not all the particles collide at a high enough temperature
• the particles need to collide with each other twice

Tags

NGSS.HS-PS1-5

Why does a catalyst increase the rate of reaction?

• it produces extra energy for the reactants
• it increases the speed of the reactant particles
• it increases the frequency of particle collisions
• it reduces the activation energy of the reaction 

Tags

NGSS.HS-PS1-4

Why does breaking up a solid reactant increase the rate of reaction?

• it creates more solid
• it creates more energy
• it increases the surface area
• it increases the concentration

Tags

NGSS.HS-PS1-3

Why does a higher temperature increase the rate of a reaction?

• it increases both the frequency and energy of particle collisions
• it only increases the frequency of particle collisions
• it only increases the energy of particle collisions
• it reduces the activation energy of the reaction

Tags

NGSS.HS-PS1-5