Chemical Kinetics

What is the parameter to measure the rate or speed of a reaction beside time?

• Change in volume
• Change in consentration
• Change in pressure
• Change in temperature

Tags

NGSS.HS-PS1-5

Which of the following is expressions represents correctly rate of following reaction?
X + Y → Z + Q     ΔH = +22kj/mol

• Rate = +Δ[X] / Δt
• Rate = +Δ[Y] / Δt
• Rate = +Δ[Z] / Δt
• Rate = -Δ[Q] / Δt

Tags

NGSS.HS-PS1-5

What is the theory which explains how chemical reaction occurs?

• Diffusion 
• Big Bang
• Collusion
• Evalusion

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

What is the energy needed for reactant particles to change into products? 

• Potential
• Kinetic
• Activation
• Conversion

Tags

NGSS.HS-PS1-4

A+B →C+D    ΔH = -202kj/mol
How can above reaction be classified in terms of energy exchange during chemical change? 

• Combination reaction
• Endothermic reaction
• Transthermal reaction
• Exothermic reaction

Tags

NGSS.HS-PS1-4

Limestone chunks are reaction with hydrochloric acid solution at constant temperature with average speed. If we crash the chunks of limestone into powder how would speed of reaction change?

• Reaction speeds up
• Reaction does not change
• Reaction slows down
• Reaction stops

Tags

NGSS.HS-PS1-5

To measure rate of reaction, either decreasing mass of solid reactant or increasing volume of gaseous products are used.
Which of the following reactions uses increasing volume of gaseous product method to measure the its rate?

• Reaction between iron metal and air
• Reaction between sodium hydroxide and nitric acid
• Reaction between  table salt and water
• Reaction between hydrochloric acid and aluminum metal

What is the rate equation of following chemical reaction?
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O

• Rate = k.[NaOH]².[H₂SO₄]
• Rate = k.[NaOH].[H₂SO₄]
• Rate = k.[NaOH]²
• Rate = k.[NaOH]².[H₂SO₄]²

Tags

NGSS.HS-PS1-5

What is the degree of the following chemical reaction?
4Al + 3O₂ → 2Al₂O₃

• 4
• 5
• 6
• 7

Tags

NGSS.HS-PS1-7

Which of the followings is not the dynamic chemical equilibrium?

• H_2(g) + l_2(g) ↔ 2HI_(g)
• H₂O_(s) ↔ H₂O_(l)
• N₂O_4(g) ↔ 2NO_2(g)
• N_2(g) + 3H_2(g) ↔ 2NH_3(g)

Tags

NGSS.HS-PS1-6