Chemical kinetics

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

• Change in volume

• Change in concentration

• Change in pressure

• Change in temperature

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 energy needed for reactant particles to change into products? 

• Potential
• Kinetic
• Activation
• Conversion

Tags

NGSS.HS-PS1-4

What is the theory which explains how chemical reaction occurs?

• Diffusion 
• Big Bang
• Collusion
• Evalusion

Tags

NGSS.HS-PS1-2

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

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

What is explaining behaviors of a system at equilibrium?

• Avagadro's Law
• Boyles Law 
• Le Chatelier Principle
• Collusion Theory

Tags

NGSS.HS-PS1-6