The branch of chemistry that focuses on the study of heat released, or absorbed by chemical or physical processes is called ……………………….
thermochemistry
thermodynamics
thermo chemistry
None of these
Q.3.
Heat is measured in
joules
grams
degrees celcius
mililiters
Q.4.
Calorimetry Question:A piece of metal with a mass of 82.9 g is heated to 100.5°C and dropped into 71.4 g of water at 20.0°C. The final temperature of the system is 30.2°C. What is the identity of the metal?
Iron
Copper
Gold
Titanium
Q.5.
H2 + Cl2 → 2 HCl +kJIs this reaction endothermic or exothermic?
Endothermic
Exothermic
Q.6.
Consider the reaction: 2 H+ energy → 2H2 + O2
exothermic, releasing energy
exothemic, absorbing energy
endothermic, absorbing energy
endothermic, releasing energy
Q.7.
A 16.0 g metallic sample was heated from 0°C to 35.0°C. It absorbed 248.7 J of energy. What is the identity of the metal?
Magnesium
Nickle
Zinc
Aluminium
Q.8.
Calculate the amount of energy needed to convertg of ice at - 8.0 °C to steam at 150.°C.
833 kJ
165 kJ
782 kJ
251 kJ
Q.9.
The thermochemical equation for precipitation of lead (II) sulphate is as follows: Pb2++SO4 −> PbSO4Pb^{2+}+SO_{^{ }}^{2-}\ \ ->\ \ PbSO_4Pb2++SO4 2− −> PbSO ΔH = −65.5 kJmol−1\Delta H\ =\ -65.kJmol^{-1}ΔH = −65.5 kJmol−Calculate the temperature change when 100cm3 of 0.5moldm−3100cm^of\ 0.5moldm^{-3}100cm3 of 0.5moldm−lead (II) nitrate solution is added to cm3of 0.5 moldm−cm^{3^{ }}of\ 0.moldm^{-3}cm3of 0.5 moldm−potassium sulphate solution
2.8 °C\degree C°C
3.9 \degree C°C
4.2 \degree C°C
1.9 \degree C°C
Q.10.
When AgNO3AgNO_3AgNOreacts 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?
lead (II) nitrate
lead (II) chloride
Potassium chloride
Potassium nitrate
Q.11.
Ionic equation for precipitation of silver chloride is shown below: Ag+Ag^+Ag+ + Cl−Cl^-Cl− --> AgClWhich of the following statement is correct when defining heat of precipitation based on the chemical reaction.
Heat of precipitation is the heat change when 1 mol of precipitate is form from its ions.
Heat of precipitation is the heat change when precipitate is form from its ions.
Heat of precipitation is the heat change when 1 mol of silver chloride is form from silver ion and chloride ion.
Heat of precipitation is the heat change when silver chloride is form from silver ion and chloride ion.
Q.12.
The following equation shows the reaction between Ag+Ag^+Ag+ and Cl−Cl^-Cl− ions. Ag+Ag^+Ag+ + Cl−Cl^-Cl− -> AgCl Δ\DeltaΔ H= -kJmol−1kJmol^{-1}kJmol−Which of the following is true about the above equation?
Exothermic reaction occurs
Heat is absorbed from the surrounding
The energy content of the reactants is less than the products
65 kJ of heat is absorbed when 1 mole of silver chloride is formed
Q.13.
How much heat is required to vaporizeg of water at 100∘C?
62.7 kJ
50.1 kJ
150. kJ
339 kJ
Q.14.
What is latent heat?
heat that cause a temperature increase
heat that causes a temperature decrease
heat used/released in a phase change
large heat
Q.15.
How much heat is required to melt 26.0 g of ice at 0∘C?
5.88 x 104 kJ
8.68 kJ
109 J
0 kJ
Q.16.
Endothermic reactions feel
warm
cold
Q.17.
Exothermic reactions feel
warm
cold
Q.18.
The amount of heat required to raise the temperature of one gram of a substance by one degree Celsius is ________
Heat energy
Specific heat
convection
thermal energy
Q.19.
Heat flows from
cold to hot
upstream
freezing to boiling
hot to cold
Q.20.
In an exothermic reaction:
ΔH is positive because energy is gained
ΔH is negative because energy is gained
ΔH is positive because energy is lost
ΔH is negative because energy is lost
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