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WorksheetsG10C-sem2-review pack-part 2
Total questions: 20
Worksheet time: 10mins
The reaction 2HgO(s) --> 2Hg(l) + O2(g) is a(n)
a. single-replacement reaction.
b. ionic reaction.
c. synthesis reaction.
d. decomposition reaction.
11. The reaction Pb(NO3)2(aq) + 2KI(aq) --> PbI2(s) + 2KNO3(aq) is a
a. double-replacement reaction.
b. decomposition reaction.
c. synthesis reaction.
d. combustion reaction.
The reaction 2KClO3(s) --> 2KCl(s) + 3O2(g) is a(n)
a. synthesis reaction.
b. combustion reaction.
c. decomposition reaction.
d. ionic reaction.
1. What is the kinetic energy of a 2 Kg ball that is rolling at a velocity of 2 m/s?
a. 4
b. 8
c. 20
d. 2.8
What is the Kinetic Energy of a 150 kg object that is moving with a speed of 15 m/s?
16875J
2000 J
2090 J
1789 J
An object has a kinetic energy of 25 J and a mass of 34 kg , how fast is the object moving?
3 m/s
4.2 m/s
1.21 m/s
3.5 m/s
An object moving with a speed of 35 m/s and has a kinetic energy of 1500 J, what is the mass of the object?
9 Kg
10 Kg
2.45 Kg
3.2 Kg
What is the Kinetic Energy of a 100 kg object that is moving with a speed of 12.5 m/s?
7812.5 J
8745.7 J
3890 J
2378.5 J
What happens to the speed of the particles if the temperature goes up?
Particles move slower
Particles move faster
Particles are not affected by temperature
Temperature affects the particle size not the speed.
The energy due to position is called_________
Kinetic energy
Work
Potential energy
Temperature
In an energy level diagram, if the products have more energy than the reactants, what does this tell you?
Combustion reaction
Exothermic reaction
Endothermic reaction
What term is given to the difference between the energy level of the reactants and the energy level of the products?
Enthalpy change
Bond energy
Activation energy
If one energy level diagram shows a much larger fall from the reactants to the products when compared with another energy level diagram, what would this tell you?
More energy is released
It is less exothermic
It is an endothermic reaction
What is always true about the enthalpy change for an endothermic reaction?
It is positive
It is zero
It is negative
What is the first step in a chemical reaction?
Bonds are broken
Bonds are made
No bonds present
If more heat energy is released in a reaction than is absorbed, what can be said about the reaction overall?
It is endothermic
It is exothermic
It will never happen
On dissolving anhydrous copper (II) sulphate in water, the reading of the thermometer raises which means that this reaction is _____ and its H value has _____ sign
Endothermic/positive
Endothermic/negative
Exothermic/negative
Which of the following statements represent correctly the endothermic reaction?
The bonds in the products molecules are stronger than those in reactants molecules
The bonds in the reactants molecules are stronger than those in the products molecules
The heat content of the products is lower than that of the reactants
It occurs spontaneously in low temperature
PCl5(g) decomposes by heat to PCl3 and chlorine gas where the bond energy of (P-Cl) = 330 KJ/mol and that of (Cl-Cl) = 240 KJ/mol. H of this reaction is ______
-90 KJ/mol
-420 KJ/mol
+420 KJ/mol
+90 KJ/mol
In the process: N2 + Energy --> N + N
Which of the following statements represents the previous process?
Breaking bonds takes place, this process is endothermic
Breaking bonds takes place, this process is exothermic
Forming bonds takes place, this process is exothermic.
Forming bonds takes place, this process is endothermic
