Worksheetsnaiinis naman sayo bhes pasko na oh gew
Total questions: 16
Worksheet time: 8mins
A chemical reaction that absorbs heat from the surroundings is said to be __________ and has a __________ DH at constant pressure.
endothermic, positive
endothermic, negative
exothermic, negative
exothermic, positive
exothermic, neutral
The reaction is __________, and therefore heat is __________ by the reaction.
exothermic, released
exothermic, absorbed
endothermic, released
endothermic, absorbed
thermoneutral, neither released nor absorbed
The value of DHe for the reaction below is -126 kJ. How much heat (in kJ) is released when 2.00 mol of NaOH is formed in the reaction?
252
-126
7.8
63
3.9
The value of DHe for the reaction below is -790 kJ. The enthalpy change accompanying the reaction of 0.95 g of S is __________ kJ.
-23
12
-12
23
-790
The value of DHe for the reaction below is -6535 kJ. How many kJ of heat are released in the combustion of 16.0 g of C6H6 (l)?
673
2.68 x 103
5.23 x 104
-6535
1.34 x 103
The value of DHe for the reaction below is -336 kJ. Calculate the heat (kJ) released to the surroundings when 23.0 g of HCl is formed.
211
177
70.7
-336
2.57 x 103
The specific heat capacity of lead is 0.13 J/g-K. How much heat (in J) is required to raise the temperature of 15 g of lead from 22eC to 37oC?
29
5.8 x 10-4
-0.13
2.0
0.13
The specific heat of liquid bromine is 0.226 J/g-K. How much heat (J) is required to raise the temperature of 10.0 mL of bromine from 25.00eC to 27.30eC? The density of liquid bromine: 3.12 g/mL.
16.2
10.4
32.4
5.20
300
The specific heat capacity of methane gas is 2.20 J/g-K. How many joules of heat are needed to raise the temperature of 5.00 g of methane from 36.0eC to 75.0oC?
22.9
88.6
429
0.0113
1221
The DH for the solution process when solid sodium hydroxide dissolves in water is -44.4 kJ/mol. When a 13.9-g sample of NaOH dissolves in 250.0 g of water in a coffee-cup calorimeter, the temperature increases from 23.0oC to ________eC. Assume that the solution has the same specific heat as liquid water, i.e., 4.18 J/g-K.
14.0oC
37.8oC
40.2oC
37.0oC
35.2oC
Given the following reactions the enthalpy of the reaction of Fe2O3 with CO is ________ kJ.
40.5
+109
-15.5
-109
-59.0
Given the following reactions the enthalpy of the reaction of the nitrogen to produce nitric oxide is ________ kJ.
-47.8
47.8
180.6
-180.6
90.3
Calculate DHe (in kJ) for reaction 3. the enthalpy of the reaction in which sulfur dioxide is oxidized to sulfur trioxide is ________ kJ.
-196
-543
1087
196
-1384
The value of DHe for the following reaction is -3351 kJ: The value of DHfe for Al2O3 (s) is __________ kJ.
-3351
-1676
+3351
-16.43
-32.86
Given the data in the table below, DHorxn for the reactionis ________ kJ.
-4219
-130.4
-4519
-76.4
-744.9
Given the data in the table below, DHorxn for the reaction is ________ kJ.
311 kJ
69 kJ
-1991 kJ
-69 kJ
The DHfo of I2 (g) is needed for the calculation.
