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WorksheetsBJU Chemistry Chapter 2 Test
Total questions: 60
Worksheet time: 2hrs 0mins
oxygen, O2
polyatomic element
diatomic element
homogeneous mixture
compound
ozone, O3
polyatomic element
diatomic element
compound
heterogeneous mixture
Lead melts in a hot flame.
physical property
chemical property
Sulfur mixed with an acid produces a gas.
physical property
chemical property
Water evaporates at 100 °C.
physical property
chemical property
A shovel rusts in humid air.
physical property
chemical property
The (a) law of thermodynamics states that all natural processes tend toward the highest entropy and minimum usable energy.
Mechanical energy can be divided into two different types, kinetic and (a) .
How would fluorine (F2) be classified? Select all that apply.
an element
a molecule
an atom
a mixture of atoms
a compound
Which of the following refer to elements rather than mixtures or compounds? Select all that apply.
a pure substance that cannot be broken down into a simpler substance by ordinary chemical means
hydrogen (H2) represented by symbols
may be heterogeneous or homogeneous
carbon dioxide (CO2)
composed of atoms of two or more different elements that have bonded together chemically
Which of the following refer to compounds rather than mixtures or elements? Select all that apply.
a pure substance that cannot be broken down into a simpler substance by ordinary chemical means
composed of atoms of 2 or more different elements that have bonded together chemically
represented by formulas
represented by symbols
carbon dioxide (CO2)
In science, the term heat is a synonym for the term temperature.
true
False
Thermal energy always flows from a higher temperature to a lower one.
True
False
Reactions that absorb energy are exothermic.
True
False
Temperature measures the total kinetic energy in a sample.
True
False
Matter can be neither created nor destroyed, only converted from one form into another.
True
False
To a chemist, CS and Cs mean the same thing. (Think of elements and compounds.)
True
False
Physical properties can be measured or observed without changing the actual composition of the material.
True
False
The disappearance of dry ice left out in a dish is an example of __________.
melting
evaporation
deposition
Which state of matter exists in a lit neon sign?
solid
liquid
gas
Which of the following is not a characteristic of solids?
fixed volume
particles rigidly held in a fixed volume
ease of compressibility
relatively little kinetic energy
The freezing point of nitrogen is –210 °C. What is the temperature in kelvins?
148 K
-63 K
483 K
63 K
The temperature outside is 87 °F. What is the temperature in degrees Celsius?
(a)
The measure of the dispersal of energy in a system is known as (a) .
What unit is used to measure both energy and work?
(a)
Which of the following is not one of the six common forms of energy?
mechanical
dynamic
nuclear
chemical
In the chemical formula 10Al(C2H3O2)3, the numeral 10 is a __________.
subscript
coefficient
superscript
multiplier
How many atoms of sulfur are present in 2Al2(SO4)3?
1
3
4
6
12
In the formula Mg(OH)2, the numeral 2 is called a __________.
base number
superscript
coefficient
subscript
Phosphorus (P4) is a
diatomic element
monatomic element
polyatomic element
compound
Hydrogen peroxide (H2O2) is a
diatomic element
compound
homogeneous mixture
polyatomic element
Oxygen (O2) is a
diatomic element
heterogeneous mixture
monatomic element
polyatomic element
Iron (Fe) is a
compound
monatomic element
heterogeneous mixture
polyatomic element
The air we breathe is classified as __________.
a suspension
a solution
both a and b
neither a nor b
A log burns, which creates heat that evaporates water in a kettle. This is an example of
a chemical change
a physical change
both a physical and a chemical change
neither a physical nor a chemical change
Which statement best describes an element?
pure, made of more than one type of atom
when combined, a chemical reaction forms
pure, made of only one type of atom
can be broken down easily
The first law of Thermodynamics is the law of.......
entropy
conservation of mass-energy
cause and effect
kinetic molecular theory
The Second Law of Thermodynamics is called the law of......
entropy
conservation of mass-energy
cause and effect
kinetic molecular theory
H2SO4
What concept has "average kinetic energy" as the key words in the definition?
Heat
Temperature
Thermal Energy
What concept has the "total mass of particles" as the key words in the definition?
Heat
Temperature
Thermal Energy
Heat transfers from...
cold to hot.
hot to cold.
To vaporize and to evaporate are the same thing. What state of matter change is it?
solid to liquid
liquid to solid
liquid to gas
gas to liquid
True or False: Two objects with the same temperature will have the same thermal energy.
True
False
True or False
The hotter the temperature the faster the molecules move around.
True
False
What happens at absolute zero?
particles move slower
particles stop moving
particles move faster
particles are unaffected
Endo means in or _______.
absorbed
released
Exo means out or ________.
absorbed
released
Baking pizza in the oven
endothermic
exothermic
Ice cubes in your glass of soda melt.
endothermic
exothermic
You freeze juice to make ice pops.
exothermic
endothermic
Which state of matter generally involves the most thermal energy?
Solid
Liquid
Gas
Plasma
The thermal energy transferred from a warmer object to a cooler object is
Heat
Temperature
Thermal Energy
How does heat flow?
From hot to cold
From cold to hot
A homogeneous mixture is also called a
compound
element
pure substance
solution
A compound is a pure substance that cannot be broken down into simpler substances by ordinary chemical means
true
false
A substance can experience a change of state as ________ energy is added to our removed from it
potential
kinetic
chemical
thermal
The kinetic-molecular theory is a model that describes the ___________of particles in matter.
mass
movement
temperature
composition
Entropy is a measure of disorder in a system. The second law of Thermodynamics states that the total entropy of an isolated system always increases over time. As energy is transferred, some of it is lost as unusable heat. What does this mean?
It increases the system's overall entropy and reduces the amount of energy available to do work.
It increases the system's overall entropy and increases the amount of energy available to do work.
It decreases the system's overall entropy and reduces the amount of energy available to do work.
It decreases the system's overall entropy and increases the amount of energy available to do work.
