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Regents Chemistry Unit 2
Test Description: Unit 2 chemistry basic concepts review
Instructions: Answer all questions to get your test result.
1) What are elements made of?
A
Compounds
B
Gluons
C
Molecules
D
Atoms
2) What term is used to describe substances that are made of elements that are chemically bonded together and can be decomposed by chemical change back into separate elements?
A
Element
B
Homogeneous mixture
C
Heterogeneous mixture
D
Compound
3) Elements and compounds are both classified as substances because they are homogeneous. This means that they have the same
A
Composition of materials throughout the sample
B
Source of liquid in the protoplasm
C
At least two elements mixed together
D
Number of protons in an atom
4) What type of solution is created when a solute such as NaCl is dissolved into water?
A
Alloy
B
Amalgam
C
Aqueous solution
D
Tincture
5) If a mixture has a varying composition throughout the sample, it is classified as a
A
Homogenous mixture
B
Heterogeneous mixture
C
Substance
D
Compound
6) Soil is an example of a(n)
A
Homogeneous mixture
B
Compound
C
Element
D
Heterogeneous mixture
7) Which of the following is an example of a physical change?
A
Decomposition
B
Combustion
C
Corrosion
D
Melting
8) Which of the following is an example of a chemical change?
A
Crushing
B
Evaporating
C
Boiling
D
Combustion
9) If 75 grams of substance A are reacted with 25 grams of substance B to form substance C, what will the mass of substance C be?
A
50 grams
B
100 grams
C
75 grams
D
25 grams
10) The energy of motion is
A
Kinetic Energy
B
Potential Energy
C
Elastic Energy
D
Chemical Energy
11) What direction does heat always flow?
A
Inside to outside
B
Cold to hold
C
Hot to cold
D
Outside to inside
12) What occurs during exothermic reactions?
A
Heat energy is absorbed
B
Heat energy is given off
C
Specific heats are calculated
D
Liquids are created
13) What occurs during endothermic reactions?
A
Heat energy is absorbed
B
Heat energy is given off
C
Liquids are created
D
Specific heats are calculated
14) If a scientist measures the temperature of water in a container surrounding a chemical reaction before and after the reaction, she is probably performing
A
Titration
B
Distillation
C
Calorimetry
D
Electrophoresis
15) In a calorimetry problem, what does C represent?
A
Grams of water
B
Specific heat of liquid
C
Joules of energy
D
Change in temperature
16) What term is used to describe the change in potential energy that accompanies a chemical reaction?
A
Exothermic
B
Endothermic
C
Delta H
D
PED
17) A positive change in potential energy indicates that energy was absorbed from the surroundings, thus lowering the temperature of the surroundings. This describes an
A
Equilibrium reaction
B
Exothermic reaction
C
Elastic reaction
D
Endothermic reaction
18) A decrease in potential energy (- delta H) indicates that energy was lost from the system and released into the surroundings, thus increasing the temperature of the surroundings. This describes an
A
Exothermic reaction
B
Equilibrium reaction
C
Endothermic reaction
D
Elastic reaction
*select an answer for all questions
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