How much heat is required to raise the temperature of a sample of copper from 10.0°C to 55.0°C, if its mass is 10.g?
1881 J
250. J
173 J
359 J
Q.2.
In an experiment,cm3 of dilute hydrochloric acid solution is mixed withcm3 sodium hydroxide solution in a polystyrene cup. The concentrations of the two solutions are the same. During the mixing, the temperature of the mixture increased by 7 0C.What is the heat released in the experiment?Given that the specific heat capacity of the solution is 4.2 J g-1 0C-1.
1470 J
2940 J
4410 J
5880 J
Q.3.
The reaction between 25.0 cm3 of hydrochloric acid and 25.0 cm3 of sodium hydroxide solution releases the heat ofJ.What is the temperature change of the mixture?[Specific heat capacity of a solution = 4-2 Jg ^C"1;Assume that 1 cm3 of a solution is equal to 1 g of the solution]
1°C
2°C
10 °C
20 °C
Q.4.
Which of the following is an endothermic reaction?
HCI + NaOH → NaCl + H2O
HCI + NaHCO3 → NaCl + CO2 + H2O
NaCl + AgNO3 → AgCl + NaNO3
Zn + CuSO4 → ZnSO4 + Cu
Q.5.
The following equation shows the combustion of heptane, C7Hin excess oxgen.C7H16(l) +O2(g) → 7 CO2(g) + 8 HΔH= -5kJ mol-The combustion of heptane in excess oxygen releases 1kJ of energy.What is the mass of heptane used?[relative atomic mass of H = 1 and C = 12]
25.0 g
36.0 g
77.0 g
88.0 g
Q.6.
The following information shows the results of an experiment to determine the heat change for the combustion of propanol, C3H7OH.Volume of water in the copper container=cm3Initial temperature of water in copper container=27.5 °CHighest temperature of water in copper container = 68.5 °CWhat is the heat released by the combustion of propanol, C3H7OH? [Specific heat capacity of water = 4.2 J g-1°C-1 ; Water density = 1 g cm-3]
34.65 kJ
51.66 kJ
86.3 kJ
120.96 kJ
Q.7.
What is precipitation reaction?
Two different aqueous soluble salts are mixed to form a soluble salt.
Two different aqueous soluble salts are mixed to form an insoluble salt.
Two different aqueous soluble salts are mixed to form an insoluble salt and a soluble salt.
One aqueous soluble salts are mixed with one insoluble salt to form an insoluble salt.
Q.8.
Why is a polystyrene cup used in the experiment to determine the heat of reaction involving two aqueous solution?
To allow the temperature of the reaction to increase uniformly
So that the reaction takes place completely
To reduce the heat loss to the surrounding
To increase the quantity of heat loss to the surrounding
Q.9.
Which of the following pairs of solutions has the same heat of precipitation as the reaction between lead (II) nitrate and hydrochloric acid?
Barium chloride and sodium sulphate
Calcium chloride and sodium carbonate
ammonium chloride and silver nitrate
copper (II) chloride and lead (II) nitrate
Q.10.
A chemical reaction that absorbs heat from the surroundings is said to be __________ and has a __________ ΔH at constant pressure.
endothermic; positive
endothermic; negative
exothermic; negative
exothermic; positive
Q.11.
ConvertkJ into joules
0.042 J
4200 J
42000 J
420 J
Q.12.
What sort of reaction happens when an acid and an alkali are mixed?
Neutralisation
Combination
Acidifying
Displacement
Q.13.
What is the formula for calculating heat?
H = mc θ\thetaθ
H = ΔH x n
H = ΔH x mass
products - reactants
Q.14.
Neutralisation reactions
endothermic
exothermic
Q.15.
In an experiment, 2 g of magnesium powder are added tocm3 of 0.2 mol dm–3 zinc sulphate solution. The temperature of the mixture increases by 12°C. What is the heat of displacement in this experiment?[Spesific heat capacity of a solution = 4.2 Jg–1 °C–Relative atomic mass of Mg = 24]
– 50.4 kJ mol-1
– 100 kJ mol-1
– 252 kJ mol-1
– 340 kJ mol-1
Q.16.
In an exothermic reaction, heat is ...
taken in
given out
Q.17.
The ______________is required to break the bonds of the reactants.
Carbonic energy
Activation energy
Plutonic energy
Energi Gaib
Q.18.
Check only the FALCE statements:
The heat change at the end of a chemical reaction under constant pressure is called the bond energy.
Melting of salt is an exothermic process.
Freezing is an endothermic process.
All of above
Q.19.
Check only the TRUE statements:
In endothermic reaction, the total energy of products is bigger than that of reactants.
Melting is an endothermic process.
Sublimation is the physical process when solid turns to gas.
All of above
Q.20.
Which one of the following reaction(s) are (is) exothermic?
combustion of gases
Freezing of water
Melting of salt
Both A & B
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