Rate of Reaction

Table 9 shows the experiments carried out to study the rate of reaction between zinc carbonate and nitric acid.

Which of the following graph represents the two experiments?

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Tags

NGSS.HS-PS1-5

Figure 12 shows the apparatus set-up to determine the rate of reaction between calcium carbonate and hydrochloric acid. Which of the following is not correct in the apparatus set-up for this experiment?

• Fixing of cork

• Position of thistle funnel

• Position of the delivery tube in the basin.

• Position of the delivery tube in the conical flask.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Magnesium reacts with acid to produce hydrogen gas, H₂.Which solution would give the highest initial rate of reaction?

• 100 cm³ of 1.0 mol dm^-3 of nitric acid, HNO₃

• 100 cm³ of 1.0 mol dm^-3 of hydrochloric acid, HCl

• 100 cm³ of 1.0 mol dm^-3 of sulphuric acid, H₂SO₄

• 100 cm³ of 1.0 mol dm^-3 of ethanoic acid, CH₃COOH

Tags

NGSS.HS-PS1-5

Diagram 7 shows a graph of the volume of gas produced against time for the reaction between zinc granules and hydrochloric acid.

The gradient of the graph decreases with time because

• catalyst is not used

• volume of mixture decreases

• temperature of reaction decreases

• concentration of hydrochloric acid decreases

Tags

NGSS.HS-PS1-5

The equation represents the reaction between sodium carbonate and hydrochloric acid.

Na₂CO₃ + 2 HCl → 2 NaCl + H₂O + CO₂

The mass of the beaker and its contents is plotted against time.

Which graph represents what happens when sodium carbonate reacts with an excess of dilute hydrochloric acid?

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Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In an experiment, 25 cm³ of 0.2 mol dm^-3 hydrogen peroxide solution decomposes to produce oxygen gas. Graph of volume of oxygen gas against time is sketched and curve R is obtained as shown in Diagram 12. Which of the following solution will produce curve S?

• 20 cm³ of 0.10 mol dm^-3 hydrogen peroxide

• 30 cm³ of 0.20 mol dm^-3 hydrogen peroxide

• 20 cm³ of 0.30 mol dm^-3 hydrogen peroxide

• 10 cm³ of 0.30 mol dm^-3 hydrogen peroxide

Tags

NGSS.HS-PS1-5

The rate of a reaction increases as temperature__________________.

• Decreases

• Increases

• Stays the Same

Tags

NGSS.HS-PS1-5

A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 

• catalyst

• product

• reactant

• solute

Tags

NGSS.HS-PS1-5

The rate of a chemical reaction is NOT affected by which of the following:

• temperature

• concentration

• particle size (surface area)

• All of these affect reaction rates

Tags

NGSS.HS-PS1-5

The ___________ the surface area of the reactants, the faster the reaction rate.

• larger 

• smaller