Unit 1 Quiz 2 Review

What does the collision theory state?

• Particles must collide with sufficient energy and proper orientation to react.

• All reactions occur without collisions.

• Reactions only occur at low temperatures.

• Particles never lose energy during collisions.

According to collision theory, which of the following would make a reaction happen faster?

• Decreasing temperature

• Increasing the space (volume)

• Increasing temperature

• Removing reactants

Tags

NGSS.HS-PS1-5

Why does heating up a substance make a reaction happen faster, according to collision theory?

• It decreases the number of collisions.

• It increases the energy and frequency of collisions.

• It makes particles move slower.

• It stops the reaction.

Tags

NGSS.HS-PS1-5

What are two reasons why chemical reactions can be unsuccessful?

• Particles collide with enough energy and correct orientation

• Particles do not collide in the right orientation or collide with insufficient energy

• Reactions always succeed

• Particles are always in the correct orientation

Which of the following lists the four stages of a chemical reaction?

• Initiation, propagation, termination, equilibrium

• Collision, bond breaking, atom rearranging, new bonds form

• Reactants, transition state, products, energy release

• Mixing, heating, cooling, separating

What is an intramolecular bond?

• A bond between two different molecules

• A bond within a molecule

• A bond between ions

• A bond between atoms in different compounds

Define the system in a chemical reaction.

• The part of the universe being studied

• The surroundings only

• The entire universe

• Only the products of the reaction

In an endothermic reaction, energy __________ from the system.

• is released

• is absorbed

• is destroyed

• remains unchanged

Tags

NGSS.HS-PS1-4

In an exothermic reaction, energy __________ from the system.

• is absorbed

• is released

• is created

• is unchanged

Tags

NGSS.HS-PS1-4

Endothermic processes are:

• Positive

• Negative

• Neutral

• Both positive and negative

Tags

NGSS.HS-PS1-4