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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
Molecules
C
Atoms
D
Gluons
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
Homogeneous mixture
B
Compound
C
Heterogeneous mixture
D
Element
3) Elements and compounds are both classified as substances because they are homogeneous. This means that they have the same
A
Number of protons in an atom
B
At least two elements mixed together
C
Composition of materials throughout the sample
D
Source of liquid in the protoplasm
4) What type of solution is created when a solute such as NaCl is dissolved into water?
A
Aqueous solution
B
Alloy
C
Amalgam
D
Tincture
5) If a mixture has a varying composition throughout the sample, it is classified as a
A
Homogenous mixture
B
Compound
C
Heterogeneous mixture
D
Substance
6) Soil is an example of a(n)
A
Element
B
Homogeneous mixture
C
Compound
D
Heterogeneous mixture
7) Which of the following is an example of a physical change?
A
Melting
B
Corrosion
C
Decomposition
D
Combustion
8) Which of the following is an example of a chemical change?
A
Evaporating
B
Crushing
C
Combustion
D
Boiling
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
75 grams
C
100 grams
D
25 grams
10) The energy of motion is
A
Elastic Energy
B
Potential Energy
C
Chemical Energy
D
Kinetic 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
Liquids are created
B
Specific heats are calculated
C
Heat energy is absorbed
D
Heat energy is given off
13) What occurs during endothermic reactions?
A
Specific heats are calculated
B
Heat energy is absorbed
C
Liquids are created
D
Heat energy is given off
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
Distillation
B
Calorimetry
C
Titration
D
Electrophoresis
15) In a calorimetry problem, what does C represent?
A
Joules of energy
B
Grams of water
C
Change in temperature
D
Specific heat of liquid
16) What term is used to describe the change in potential energy that accompanies a chemical reaction?
A
Endothermic
B
PED
C
Exothermic
D
Delta H
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
Elastic reaction
B
Exothermic reaction
C
Endothermic reaction
D
Equilibrium 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
Equilibrium reaction
B
Endothermic reaction
C
Exothermic reaction
D
Elastic reaction
*select an answer for all questions
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