Rate and Extent of Chemical Change

Equilibrium is reached when the forward reaction and the reverse reaction happen at the same time.

• True

• False

The reaction produces 1.6 g of gas in 30 seconds.Calculate the mean rate of the reaction in the first 30 seconds

Complete the equation for the reaction.

CaCO₃ + 2HCl ⟶ ________________________________________

• CaCl + CO + H₂O

• CaCl₂ + H₂O

• CaCl₂ + CO₂ + H₂O

• CaCO₂ + Cl₂ + H₂O

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 reactant particles

• it increases the frequency of collision

Tags

NGSS.HS-PS1-5

Increasing pressure causes the reacting particles

• to bond together

• to repel from each other

• gain more kinetic energy

• to move closer together

Tags

NGSS.HS-PS3-2

In an exothermic reaction, heat is ...

• taken in
• given out

Tags

NGSS.HS-PS1-4

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

• The energy needed for a reaction to occur
• The minimum amount of energy needed for a reaction to potentially occur
• The energy added by a catalyst
• The energy possessed by the products

Tags

NGSS.HS-PS1-4

Which is the reactant - and why?

• A, as concentration decreases
• B, as concentration decreases
• A, as concentration increases
• B, as concentration increases

Tags

NGSS.HS-PS1-5

At what time the reaction reached equilibrium?

• t₁
• t₂
• t₃
• t₄

Tags

NGSS.HS-PS1-6

For the reaction...

SO₂ + O₂ ⇄ SO₃

If the concentration of SO₂ is increased, the equilibrium position of the reaction will shift ___________.

• to the left

• to the right

• to the left and right

• neither left nor right