WorksheetsEnthalpy BR 11
Total questions: 11
Worksheet time: 15mins
Name
Class
Date
1.
The SI unit of heat and energy is the __________.
a)
calorie
b)
heat
c)
joule
d)
watt
2.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
3.
How do you calculate Enthalpy of a reaction?
a)
ΔH = ΔHproducts - ΔHreactants
b)
ΔT = q / mC
c)
ΔG = ΔH -TΔS
d)
E = mc2
4.
Which statement is true regarding endothermic reactions?
a)
a) Temperature change is positive and enthalpy change is positive
b)
b) Temperature change is positive and enthalpy change is negative
c)
c) Temperature change is negative and enthalpy change is positive
d)
d) Temperature change is negative and enthalpy change is negative
5.
Define 'Enthalpy'
a)
a) Energy stored in the movement of molecules in a substance
b)
b) The opposite of temperature
c)
c) The temperature of a molecule
d)
d) Energy stored in the chemical bonds in a substance
6.
The enthalpy change is a negative (-) value, what side of the equation will the energy value be on.
a)
Reactants
b)
Products
7.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
8.
If 100 g of aluminum at 145ºC gains 6,800 J of heat, what is the final temperature (Tfinal) of the aluminum? Aluminum has a specific heat of 0.897 J/gºC. (Q=mcΔT)
a)
-69°C
b)
0.52°C
c)
221°C
9.
A 100ml of water is heated by the burning of a biscuit.If he ΔT=200C and the change in mass of the biscuit, Δm =1.35g.Find the enthalpy of the biscuit in kJ/g. (Q=mcΔT)
a)
6.19
b)
61.9
c)
6193
d)
8360
10.
A 200ml of water is heated by the burning of a biscuit.If he ΔT=45.60C and the change in mass of the biscuit, Δm =5.35g.Find the enthalpy of the biscuit in kJ/g. (Q=mcΔT)
a)
7126
b)
71.3
c)
7.13
d)
38.12
11.
How much heat does an aluminum block absorb if 10.00 grams ae heated from 25.0oC to 50.0oC? the specific heat of aluminum is 0.900J/goC
a)
450
b)
-450
c)
225
d)
-225
100 %
