Free Printable Heat of precipitation

1.

A chemical reaction that absorbs heat from the surroundings is said to be __________ and has a __________ ΔH at constant pressure.

a)

endothermic; positive

b)

endothermic; negative

c)

exothermic; negative

d)

exothermic; positive

2.

Convert 42 kJ into joules

a)

0.042 J

b)

4200 J

c)

42000 J

d)

420 J

3.

What is the formula for calculating heat?

a)

H = mc $\theta$

b)

H = ΔH x n

c)

H = ΔH x mass

d)

products - reactants

4.

Which of the following pairs of solutions has the same heat of precipitation as the reaction between lead (II) nitrate and hydrochloric acid?

a)

Barium chloride and sodium sulphate

b)

Calcium chloride and sodium carbonate

c)

ammonium chloride and silver nitrate

d)

copper (II) chloride and lead (II) nitrate

5.

What is precipitation reaction?

a)

Two different aqueous soluble salts are mixed to form a soluble salt.

b)

Two different aqueous soluble salts are mixed to form an insoluble salt.

c)

Two different aqueous soluble salts are mixed to form an insoluble salt and a soluble salt.

d)

One aqueous soluble salts are mixed with one insoluble salt to form an insoluble salt.

6.

The following equation shows the reaction between $Ag^+$ and $Cl^-$ ions.
$Ag^+$ + $Cl^-$ -> AgCl $\Delta$ H= -65 $kJmol^{-1}$
Which of the following is true about the above equation?

a)

Exothermic reaction occurs

b)

Heat is absorbed from the surrounding

c)

The energy content of the reactants is less than the products

d)

65 kJ of heat is absorbed when 1 mole of silver chloride is formed

7.

Why is a polystyrene cup used in the experiment to determine the heat of reaction involving two aqueous solution?

a)

To allow the temperature of the reaction to increase uniformly

b)

So that the reaction takes place completely

c)

To reduce the heat loss to the surrounding

d)

To increase the quantity of heat loss to the surrounding

8.

Ionic equation for precipitation of silver chloride is shown below:
$Ag^+$ + $Cl^-$ --> AgCl
Which of the following statement is correct when defining heat of precipitation based on the chemical reaction.

a)

Heat of precipitation is the heat change when 1 mol of precipitate is form from its ions.

b)

Heat of precipitation is the heat change when precipitate is form from its ions.

c)

Heat of precipitation is the heat change when 1 mol of silver chloride is form from silver ion and chloride ion.

d)

Heat of precipitation is the heat change when silver chloride is form from silver ion and chloride ion.

9.

When $AgNO_3$ reacts with NaCl solution, the temperature changed by x $\degree$ C. Which of the following solution is suitable to be use to replace NaCl and will give the same amount of temperature change?

a)

lead (II) nitrate

b)

lead (II) chloride

c)

Potassium chloride

d)

Potassium nitrate

10.

The thermochemical equation for precipitation of lead (II) sulphate is as follows: $Pb^{2+}+SO_{4\ ^{ }}^{2-}\ \ ->\ \ PbSO_4$ $\Delta H\ =\ -65.5\ kJmol^{-1}$
Calculate the temperature change when $100cm^3\ of\ 0.5moldm^{-3}$ lead (II) nitrate solution is added to $100\ cm^{3^{ }}of\ 0.5\ moldm^{-3}$ potassium sulphate solution

a)

2.8 $\degree C$

b)

3.9 $\degree C$

c)

4.2 $\degree C$

d)

1.9 $\degree C$

Heat of precipitation

Total questions: 10

Worksheet time: 10mins

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