Regents Chemistry Unit 2 Question Preview (ID: 19370)

Unit 2 Chemistry Basic Concepts Review.

What are elements made of?
a) Molecules
b) Atoms
c) Compounds
d) Gluons

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) Compound
c) Homogeneous mixture
d) Heterogeneous mixture

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) Source of liquid in the protoplasm
c) Composition of materials throughout the sample
d) At least two elements mixed together

What type of solution is created when a solute such as NaCl is dissolved into water?
a) Aqueous solution
b) Tincture
c) Amalgam
d) Alloy

If a mixture has a varying composition throughout the sample, it is classified as a
a) Substance
b) Compound
c) Homogenous mixture
d) Heterogeneous mixture

Soil is an example of a(n)
a) Heterogeneous mixture
b) Element
c) Compound
d) Homogeneous mixture

Which of the following is an example of a physical change?
a) Combustion
b) Decomposition
c) Melting
d) Corrosion

Which of the following is an example of a chemical change?
a) Boiling
b) Combustion
c) Evaporating
d) Crushing

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) 100 grams
b) 75 grams
c) 50 grams
d) 25 grams

The energy of motion is
a) Potential Energy
b) Elastic Energy
c) Kinetic Energy
d) Chemical Energy

What direction does heat always flow?
a) Cold to hold
b) Inside to outside
c) Hot to cold
d) Outside to inside

What occurs during exothermic reactions?
a) Heat energy is given off
b) Heat energy is absorbed
c) Liquids are created
d) Specific heats are calculated

What occurs during endothermic reactions?
a) Heat energy is given off
b) Liquids are created
c) Specific heats are calculated
d) Heat energy is absorbed

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) Calorimetry
b) Electrophoresis
c) Distillation
d) Titration

In a calorimetry problem, what does C represent?
a) Specific heat of liquid
b) Joules of energy
c) Grams of water
d) Change in temperature

What term is used to describe the change in potential energy that accompanies a chemical reaction?
a) Endothermic
b) Delta H
c) Exothermic
d) PED

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) Equilibrium reaction
c) Exothermic reaction
d) Endothermic reaction

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) Endothermic reaction
c) Elastic reaction
d) Equilibrium reaction

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