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Worksheetsquiz 2 lesson 2 sec 1
Total questions: 20
Worksheet time: 2hrs 40mins
Which of the following is an application of law of conservation of energy? …
The total energy of an isolated system which contains ice remains the same even when the ice is turned to water
Hydrogen gas and oxygen gas react together to form water with releasing thermal energy
In photosynthesis, light energy converts into chemical energy
Reaction of magnesium with oxygen is accompanied by absorbing thermal energy.
Which of the following statements represents a closed system? .........
The in coming mass = the outgoing mass from the system.
Matter does not transfer either to or from the system
Incoming matter in the system might be more or less than the outgoing matter.
It does not exchange either heat or work with its surrounding.
What is the system which contains a constant mass of matter and its boundaries do not allow the passage of matter ? ...............
Equilibrium system
Open system.
Closed system.
Thermally equilibrium system.
What is the quantity of energy which is equivalent to 50 kJ? ...
0.05 J
500 J
5 x 103 J
5 x 104 J
If the temperature of a substance is doubled as well as its mass, its specific heat will be...
decreased to quarter
constant
increased to double
increased to four times
In the following reaction:
2Na2O2(s)+ 2H2O(l) → 4NaOH(s)+O2(g) ∆H =-126 kJ
What is the quantity of heat released by producing 2 mol of ?
+252 kJ
+63 kJ
+3.9 kJ
+78 kJ
In the reaction:
2H2O(l)→2H2O(l)+O2(g) ∆H =-196 kJ
What is the change in the enthalpy of the decomposition of 0.34 g of hydrogen peroxide [H=1, O=16]
-0.98 kJ
-1.96 kJ
-196 kJ
-98 kJ
Nitrogen reacts with oxygen according to the following thermochemical equation:
N2(g)+2O2(g)→2NO2(g) ∆H = +66 kJ
What is the change in enthalpy on mixing 2 mol of nitrogen with 2 mol of oxygen?
+132 kJ
+66 kJ
+33 kJ
+16.5 kJ
Which of the following statements represents the type of the chemical reaction which happens when a match head is rubbed against a rough surface?
Endothermic reaction due to using energy on rubbing the match head.
Endothermic reaction due to releasing energy on burning the wooden match.
Exothermic reaction due to using energy on rubbing the match head.
Exothermic reaction due to releasing energy on rubbing the wooden match.
Which of the following statements represents correctly the endothermic reaction?
The bonds 1 in the products molecules are stronger than those in reactants molecules
The bonds j in the reactants molecules are stronger than those in products molecules
The heat content of the products is lower than that of the reactants.
It occurs spontaneously in low temperatures.
The reaction: : H2(g)+Cl2(g)→ 2HCl(g)… is exothermic, because …
The absorbed energy during breaking the bonds is higher than that produced during bond formation.
The produced energy during bond formation is higher than that required to break the bonds.
Number of broken bonds is higher than that of formed bonds.
Number of formed bonds is higher than that of broken bonds.
The plant cells use light energy to carry out photosynthesis process, which of the following represents photosynthesis reaction?
It is an ......... process, because the released energy during the formation of the bonds is …….. than the energy required to break the bonds
Energy absorbing / less.
Energy absorbing / greater.
Energy releasing / less.
What is Avogadro’s number to 2 decimal places?
6.02 x 1023
6.71 x 1014
109
3.14
What is the SI unit for energy?
Joule (J) (joule)
Mole (mol)
Watt (W)
Kilogram (kg)
Which of the following are units for the molar enthalpy change of a reaction, Δ𝐻?
mol/dm3
∘C/atom
kJ/mol
cm3/s
Specific heat of water is higher than that of mercury, which of the following statements does not agree with the previous information?
The quantity of heat required to raise the temperature of 10 g of water by 15°C is higher than that required to raise the temperature of the same mass of mercury by the same degrees.
The quantity of heat released by lowering the temperature of 20 g of water by 10°C is higher than that released by lowering the temperature of the same mass of mercury by the same degrees.
The quantity of heat released by lowering the temperature of 100 g of water from 80°C to 20°C equals the quantity of heat released by lowering the temperature of the same mass of mercury from 80°C to 20°C.
By heating two equal masses of water and mercury, both have the same initial temperature, with the same quantity of heat, the final temperature of mercury will be higher than that of water.
The bomb calorimeter is used to measure the heat of combustion of some substances...
under normal atmospheric pressure.
at 25°C
at 100°C
(a under high pressure.
The specific heat capacity of a substance is usually given in units of joules per gram per degree Celsius. From these units, which of the following statements best describes specific heat capacity?
The amount of energy needed to raise the temperature of 1 g of a substance by 1∘C
The temperature of a substance that is equal to the amount of energy multiplied by its mass
The amount of substance that can be produced when one joule of energy is raised by 1∘C
The amount of energy formed when 1 gram of a substance reaches a specific temperature
4.6 g of a fuel is found to produce -3965 J of heat energy. If the 𝑀r of the fuel is 46 g/mol,what is the molar enthalpy change?
−39.65 kJ/mol
−18.24 kJ/mol
-2.52 KJ/mol
-78.36 KJ/mol
A food manufacturer determines that the energy content of one slice of their new bread is 400 kJ.What value is this in kilocalories?Give your answer to 1 decimal place.
95.6 Kcal
80 Kcal
89 Kcal
99 Kcal
