quiz 2 lesson 2 sec 1

Quiz
•
Chemistry
•
11th Grade
•
Medium
Marwan mamdouh
Used 3+ times
FREE Resource
20 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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.
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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.
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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.
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
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
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