Rate of reaction 1

What is the meaning of the rate of reaction?

• Decrease in amount of product

• Decrease in amount of product against time

• Increase in amount of products against time

• Increase in amount of reactants against time

Tags

NGSS.HS-PS1-5

Which unit is correct for the rate of reaction?

• g mol^-1

• g min^-1

• mol dm^-3

• kJ mol^-1

Tags

NGSS.HS-PS1-5

Which of the following has the lowest rate of reaction?

• Combustion of ethanol

• Fermentation of glucose

• Oxidation of magnesium

• Precipitation of silver chloride

Tags

NGSS.HS-PS1-5

Which reactions has the highest rate of reaction?

• Rusting of water pipe

• Photosynthesis in green plant

• Burning of a small piece of charcoal in the air

• Formation of stalactites and stalagmites

Tags

NGSS.HS-PS1-5

Which process has the highest rate of reaction?

• Rusting

• Respiration

• Combustion

• Photosynthesis

Tags

NGSS.HS-PS1-5

The following equation represents a chemical equation.

CaCO₃ + 2HCl --> CaCl₂ + CO₂ + H₂O

Which graph shows the correct change in mass of reactant used in excess against time?

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Tags

NGSS.HS-PS1-7

The rate of reaction for the decomposition of hydrogen peroxide decreases with time because

• product of reaction decreases

• temperature of hydrogen peroxide decreases

• volume of hydrogen peroxide decreases

• concentration of hydrogen peroxide decreases

Tags

NGSS.HS-PS1-5

In which of the chemical reactions can the rate be determined by measuring the change in the gas volume?

• Acidified potassium manganate (VII) solution with iron (II) sulphate solution

• Sodium hydroxide solution with dilute hydrochloric acid

• Silver nitrate solution with sodium chloride solution

• Calcium carbonate with dilute hydrochloric acid

Tags

NGSS.HS-PS1-5

Diagram shows the apparatus set up for an experiment to determine the rate of reaction.

Which of the following techniques is the most suitable to determine the rate of reaction?

• Record the time as soon as precipitate is formed

• Record the time taken to obtain the maximum temperature

• Record the times as soon as the cross mark cannot be seen

• Record the times taken for the change of the pH value until a fixed pH value is obtained

The reaction between zinc, Zn and hydrochloric acid, HCl is represented by the following equation.

Zn + 2HCl --> ZnCl₂ + H₂

A student wants to determine the rate of reaction in a school laboratory. Which of the following methods is the most suitable?

• Determine the change in temperature of the solution with time

• Determine the change in the concentration of zinc chloride with time

• Determine the volume of hydrogen gas given off with time

• Determine the change in the concentration of hydrochloric acid with time

Tags

NGSS.HS-PS1-5