# Science Quiz [ Mr, Shokir ]

16 Questions | Total Attempts: 139  Settings  .

• 1.
Calculate :
• 2.
Calculate the heat quantity in - kJ - required to raise the temperature of 48.7 g of water from 22.8 C to 62 C
• 3.
Calculate the heat quantity in - kJ - required to raise the temperature of 48.7 g of water from 22.8 C to 62 C
• 4.
Which one of the following substances has the higher specific heat ? ...........
• A.

1 g of water

• B.

1 g of iron

• C.

1 g of Alumnium

• D.

1 g of mercury

• 5.
If the temperature of a substance is doubled , its specific heat will be ..............
• A.

Decreased to half

• B.

Constant

• C.

Increased to double

• D.

Increased to four times

• 6.
If the two bodies have the same mass , gain the same amount of heat , the raise in the temperature of the second body is double that of the first , therefore the specific heat of the second body is ............ the first one.
• A.

Equal to

• B.

Double

• C.

Half

• D.

Quarter

• 7.
The following is a list of specific heat capacities for a few metals :  C copper = 0.385 , C iron = 0.444 , C silver = 0.240 , C aluminum = 0.900  50 g of sample on an unknown metal is heated with 800 joules , if the temperature of the metal increases by 41.6 C , What is the identity of the unknown metal ? ................
• A.

Copper

• B.

Silver

• C.

Alumnium

• D.

Iron

• 8.
Using the quantity of heat equation , what would the formula look like if we were calculating the change in temperature ? ........
• A.

Qp.m=Δ T.c

• B.

Qp/m.c=Δ T

• C.

Qp.m/c=Δ T

• D.

Qp.c.m=Δ T

• 9.
The (+ ve) sign which precedes the Δ H value , indicates that the enthalpy of products is ............ that of reactants
• A.

Larger than

• B.

Equal

• C.

Lower than

• D.

Constant

• 10.
If the heat content of products is lower than that of reactants , thus the reaction ...........
• A.

Is endothermic

• B.

Is exothermic

• C.

Whose Δ H value has a positive sign

• D.

Whose Δ H value = zero

• 11.
Dissolving process is called hydration when the solvent is ..........
• A.

Benzene

• B.

Oil

• C.

Alcohol

• D.

Water

• 12.
In the following thermochemical equation :  The heat change accompanied with this process is called ............... heat
• A.

Formation

• B.

Combustion

• C.

Dissolving

• D.

Neutralization

• 13.
What is the change in Enthalpy on dissolving 40 g of NaOH in water to form one liter of solution , knowing  that the temperature raised by 10.6 C  ? .............kJ/mol [ NaOH = 40 g/mol ]
• A.

-0.443

• B.

-4.4308

• C.

-44.308

• D.

-443

• 14.
Which of the following remains constant in the closed system ? .......
• A.

Energy

• B.

Mass

• C.

Temperature

• D.

Enthalpy

• 15.
In the reaction :
• A.

Negative , because the reaction is endothermic

• B.

Positive , because the reaction is endothermic

• C.

Negative , because the reaction is exothermic

• D.

Positive m because the reaction is exothermic

• 16.
Anhydrous copper II chloride reacts with water to form hydrous copper II chloride , according to the equation :
• A.

-1586 kJ/mol

• B.

316 kJ/mol

• C.

-110 kJ/mol

• D.

-30 kJ/ mol