practice test on Equilibrium and reaction rates

Rate of chemical reaction means

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

Which factors increase the rate of a reaction.

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

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.

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

• Spontaneous
• Sluggish
• Exothermic
• Endothermic

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

B represents

• energy absorbed
• energy released
• activation energy

A chemical reaction that requires energy to happen

• Exothermic

• Endothermic

• Explosive

• Hot reaction

Tags

NGSS.HS-PS1-4

Le Chaltelier's Principle states that if a chemical system at equilibrium is stressed,

• the system will adjust to increase the stress
• the system will adjust to reduce the stress
• the system will not adjust

Tags

NGSS.HS-PS1-6

When writing an endothermic reaction, heat energy is stated as

• product
• catalyst
• reactant

Tags

NGSS.HS-PS1-4

An exothermic reaction is allowed to reach equilibrium. If heat energy is then removed, the equilibrium will shift

• toward the middle
• toward the reactant side
• toward the product side

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-6