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Final Exam 4
Test Description: Final
Instructions: Answer all questions to get your test result.
1) What sign does ∆H have in exothermic reactions?
A
negative
B
positive
C
neutral
D
none of these
2) What is the definition of enthalpy?
A
The unavailability of a system’s thermal energy to do work
B
Energy that transfers from one object to another because of a temperature difference between them
C
Change in heat content for a reaction at constant pressure
D
The quantity of heat required to raise the temperature of a sample of a substance one degree Celsius
3) A 50-gram piece of silver is dropped into a container of water. As it cools, the silver gives off 200 calories of heat. What is the silver’s temperature change? (The specific heat capacity of silver is 0.056 cal/g°C).
A
560 °C
B
4.5 °C
C
5.6 x 10-6 °C
D
71.4 °C
4) A piece of sugar free gum is burned in a bomb calorimeter containing 500 g of water. The temperature of the water increases from 25 ºC to 35 ºC. How many calories did the peanut have?
A
30,000 calories
B
470 calories
C
5 calories
D
5000 calories
5) In ______, an atom gives off a helium atom without the electrons.
A
alpha decay
B
beta emission
C
gamma emission
6) In ______, an atom breaks apart a neutron into a proton and electron; the electron is released..
A
alpha decay
B
gamma emission
C
beta emission
7) _____ is the easiest radiation to stop; it can be stopped by a single sheet of paper.
A
alpha radiation
B
beta radiation
C
gamma radiation
8) ______ is one of the harder radiations to stop; it can go through your body, but is stopped by lead or steel plates.
A
alpha radiation
B
gamma radiation
C
beta radiation
9) To balance a nuclear equation for beta decay, you should _________ the atomic number by the atomic number of the beta particle.
A
divide
B
minus
C
multiply
D
plus
10) Finish the equation for the following beta decay reaction: 1 3H Æ ? + -10e
A
3 3Li
B
5 3B
C
none of these
D
2 3He
11) If a solution can hold more solute (it isn’t full yet) it is ___.
A
Unsaturated
B
supersaturated
C
saturated
12) If a solution cannot hold any more solute (it is full) it is ___.
A
unsaturated
B
saturated
C
supersaturated
13) If a solution holds more solute than it should be able (its over full) it is ___.
A
unsaturated
B
saturated
C
supersaturated
14) A solution is saturated at 25g per 100g of H2O. If 25 grams is dissolved in 100g of H2O, it is ___.
A
unsaturated
B
saturated
C
supersaturated
15) A solution is saturated at 25g per 100g of H2O and holds 22 grams in 100g of H2O. It is ___.
A
supersaturated
B
saturated
C
unsaturated
16) A solution is saturated at 25g per 100g of H2O and holds 31 grams in 100g of H2O. It is ___.
A
saturated
B
unsaturated
C
supersaturated
17) is the type of polyprotic acid that can donate two protons per molecule
A
Polyprotic Acid
B
Diprotic Acid
C
Brønsted-Lowry Acid
D
Brønsted-Lowry Base
18) is a molecule or ion that is a proton acceptor.
A
Brønsted-Lowry Acid
B
Polyprotic Acid
C
Brønsted-Lowry Base
D
Diprotic Acid
19) is a molecule or ion that is a proton donor.
A
Brønsted-Lowry Acid
B
Polyprotic Acid
C
Diprotic Acid
D
Brønsted-Lowry Base
20) an acid that can donate more than one proton per molecule.
A
Diprotic Acid
B
Polyprotic Acid
C
Brønsted-Lowry Base
D
Brønsted-Lowry Acid
*select an answer for all questions
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