Which of the following is NOT true at equilibrium?

The concentration of the reactants is equal to the concentration of the products.

The forward and reverse reactions proceed at the same rate.

The concentrations of reactants and products do not change.

The forward and reverse reactions continue to occur.

What is the activation energy?

the minimum energy needed to begin a reaction

the quantity of heat absorbed in a reaction

the energy given off after reactants collide.

both the energy and frequeny of collisions in increased the energy difference between reactants and products

For the reaction... N 2 (g) + 3 H 2 (g) <=> 2 NH 3 (g) If the pressure in the system is increased , which substance(s) will increase in concentration?

NH 3 (as 4 mol gas → 2 mol gas)

N 2 (as 2 mol gas → 4 mol gas)

H 2 (as 2 mol gas → 4 mol gas)

N 2 and H 2 (as 2 mol gas → 4 mol gas)

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

Increase collision between the particles thus increasing the rate.

Allow less effective collision between the particles

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

Which of these will NOT speed up the rate of reaction between a strip of magnesium and hydrochloric acid?

roll the magnesium strip into a small ball

Grind up the strip of magnesium

increase the concentration of the hydrocholoric acid

increase the temperature of the hydrocholoric acid

When we investigate the rate of reaction we are looking at the...

concentration of reacting particles

combining reactants with products

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

Place the reaction in a ice bath

Place the reaction in hot water

Keep stirring the reactants with a stirring rod

How could we make this reaction happen more quickly?

crush the chalk to increase the surface area

Decrease the concentration of the acid

Put the test tube in an ice bath

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

not all the particles collide with enough energy

the particles also need to collide with a catalyst

not all the particles collide at a high enough temperature

the particles need to collide with each other twice

Which of the following is/are the fundamental idea(s) of collision theory?

Molecules react by colliding together

The effective collisions must occur with certain minimum amounts of energy

In a large sample, the greater the number of effective collisions, and the faster the rate of reaction

In a solution when particles collide, most of the collisions

do not result in a chemical reation

What is necessary for a chemical reaction to occur?

particle collisions with sufficient energy

Correct orientation of particles when they collide

an increase or decrease in temperature

What does a catalyst do to speed up a reaction?

It reduces the required energy for a chemical reaction to occur

It reduces the surface area of the reactants

It increases the surface area of the reactants.

It increases the required energy for a chemical reaction to occur

A reactants surface area is increased. What happens?

the same number of collisions occur

A reactants concentration is increased. What happens?

the same number of collisions occur

Reaction Rates and Equilibrium

Authored by Myles Parnell

Chemistry

9th - 12th Grade

NGSS covered

Used 12+ times

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MULTIPLE SELECT QUESTION

30 sec • 1 pt

List four factors that affects the rate of a reaction

temperature

concentration

surface area

volume

catalysts

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A temperature increase causes the particles ......

to slow down

move faster

collide higher

in the right order

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does a catalyst work in speeding up a reaction?

By lowering the activation energy or reaction

by giving them more energy

by making them more available

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

Red, because the activation energy is larger

Blue, because the activation energy is lower

both reaction progress at the same rate

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In an exothermic reaction, heat is ...

taken in

given out

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why does a higher concentration increase the rate of reaction?

it increases the amount of reactants

it lowers the activation energy

it increases the energy of particle collisions

it increases the frequency of particle collisions

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What makes an effective collision?

When molecules collide.

When molecules collide with the proper orientation.

When molecules collide with proper orientation and enough kinetic energy.

High Temperature.

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Reaction Rates and Equilibrium

List four factors that affects the rate of a reaction

A temperature increase causes the particles ......

How does a catalyst work in speeding up a reaction?

The following graph shows two different reaction pathways for the same overall reaction at the same temperature. Which pathway is slower and why?

In an exothermic reaction, heat is ...

Why does a higher concentration increase the rate of reaction?

What makes an effective collision?

Located on the left side of the reaction

This symbol indicates that a reaction is ____________

When the rate of the forward reaction is equal to the rate of backward reaction, the system is said to be in

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