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Measuring Enthalpy Changes

Total questions: 20

Worksheet time: 15mins

Name
Class
Date
1.

In an endothermic reaction, energy is _________.

a)

absorbed

b)

released

2.

_____ reactions usually feel hot!

a)

endothermic

b)

exothermic

3.

Solid --> liquid --> gas is what type of reaction?

a)

endothermic

b)

exothermic

c)

catalytic

d)

inhibited

4.

Endo means in or _______.

a)

absorbed

b)

released

5.

Exo means out or ________.

a)

absorbed

b)

released

6.

The graph above is from which type of reaction?

a)

Endothermic reaction

b)

Exothermic Reaction

7.

The graph above is from which type of reaction?

a)

Endothermic reaction

b)

Exothermic reaction

8.
A measure of the average kinetic energy of the individual particles in an object is called:
a)
thermal energy
b)
conduction
c)
convection
d)
temperature
9.
Water boils at 212⁰F, which is equivalent to__.
a)
273 K
b)
0⁰ C
c)
100⁰C
d)
37⁰C
10.

How does heat transfer when you hold an ice cube in your hand?

a)

from the cold ice cube to your warm hand

b)

the cold ice cube makes your hand cold

c)

from your warm hand to the cold ice cube

d)

very carefully

11.

Energy that transfers from one substance to another until the temperatures are equal is called...

a)

Joe

b)

temperature

c)

MELTS

d)

heat

12.
What would be the effect on the particles if more heat is supplied to the system?
a)
They would slow down
b)
They would stop moving
c)
They would speed up
d)
There would be no effect
13.
The total energy of all the particles in a substance is called: 
a)
temperature
b)
thermal energy
c)
degrees
d)
mass
14.
The SI unit of heat and energy is the __________.
a)
calorie
b)
heat
c)
joule
d)
watt
15.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
16.

How do you calculate Enthalpy of a reaction?

a)

ΔH = ΔHproducts - ΔHreactants

b)

ΔT = q / mC

c)

ΔG = ΔH -TΔS

d)

E = mc2

17.
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
18.

A reaction that gives out energy to the surroundings causes the surroundings ....

a)

temperature to drop

b)

temperature to rise

c)

temperature to remain constant

d)

temperature to vary

19.
N2 +  3H2 −->  2NH3 
How many moles of ammonium are produced when 3 moles of nitrogen react with hydrogen?
a)
6 moles Ammonium
b)
1.5 moles ammonium
c)
9 moles ammonium
d)
9 moles hydrogen
20.
C+ O2 --> CO2 + 60kJ, what is the value for ΔH for the reaction?
a)
+60
b)
-60
c)
there is no way to know

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