CHM 1040: Final 1/4

Chemistry is relevant to which of the following areas of study?


A) Environmental studies
B) Atmospheric studies
C) Nuclear studies
D) Biological studies
E) All of the above

2.



______ is an example of a derived unit - a unit built up from standard units.

A) Temperature in fahrenheit
B) Length in feet
C) Mass in kg
D) Volume in m3
E) Time in seconds

Which is not an example of chemistry at work?

A) Your body converts food into energy.
B) A battery powers your alarm clock.
C) Bread rises in a warm oven.
D) Arms inspectors use "sniffers" to find dangerous weapons.
E) A rock breaks a mirror

Among other things, chemists have learned ______.

A) literature.
B) critical thinking.
C) to memorize only facts
D) languages.
E) biology.

A quantitative observation:

A) is a general description.
B) does not depend upon numbers.
C) is a measurement.
D) describes something exactly.

By definition, a mixture has variable

A) phases.
B) composition
C) elements.
D) mass.
E) color.

Why is a gas much more compressible than a solid?

A) Gases may flow freely.
B) Gases are mostly empty space.
C) Gases have indefinite shape.
D) Solids break apart easily.
E) Solids are rigid.

Gases have a definite shape.

A) True
B) False

An approximation:

A) is an exact relationship.
B) is never used in "real" science.
C) creates error.
D) is sometimes used to simplify science.

Air is

A) a solid.
B) a homogeneous mixture.
C) a pure substance.
D) devoid of water.
E) the atmosphere.

A set of hypotheses is called a(n)

A) experiment
B) rule
C) a model or theory
D) natural law

Heating 512 g of iron from 500ºC to 533ºC requires _______ of heat. The specific heat of iron is 0.45 J/ºC g.

A) 37500 J
B) 6.98 J
C) 119000 J
D) 7600 J
E) 7.6 J

An absolute temperature scale

A) is always known.
B) is never attainable.
C) can be expressed in any unit.
D) is always positive.
E) may be no larger than 10000.

Arrange the density of a generic substance according to state.

A) liquid > solid > gas
B) gas > liquid ? solid
C) gas > liquid > solid
D) solid ? liquid > gas
E) gas ? liquid < solid

Which of the following statements is qualitative?

A) That pizza smells good!
B) That pizza cost only $10.00.
C) I ate four slices of pizza last night.
D) I had to work all night at the pizza parlor.

A certain substance contains three different elements. It could be

A) An atom.
B) a compound.
C) Pure water.

Doing chemistry successfully requires

A) the right genes.
B) extensive experience.
C) luck.
D) practice solving problems.

A(n) _______ gives one possible explanation for an observation.

A) discussion
B) natural law
C) theory
D) hypothesis
E) experiment

A homogeneous mixture is

A) granular.
B) a compound.
C) restricted to a single phase.
D) the same throughout.
E) always a liquid.

A _______ may not be modified over time.

A) natural law
B) chemical equation
C) theory
D) hypothesis

Round the number 14.449 to three significant digits.

A) 15.0
B) 14.400
C) 14.4
D) 14.0
E) 14.5

The amount of energy required by a process depends upon

A) the amount of substance.
B) none of these.
C) all of these.
D) the types of substances involved.
E) the temperature change.

The scientific method:

A) depends upon memorization.
B) is a methodical way to do chemistry.
C) cannot predict.
D) is repetative and tedious
E) can prove a theory is true.

Which of the following is a quantitative observation?

A) Solid CO2 turns directly into a gas.
B) The solution has a white solid at the bottom of the beaker.
C) The solution is blue.
D) Water vapor is odorless.
E) Water boils at 100 degrees Fahrenheit.

Distillation requires

A) expensive tools.
B) water.
C) a flame.
D) a mixture.
E) alcohol.

Chemistry is a(n) _______ science.

A) trivial
B) difficult
C) performing
D) experimental
E) biological

Determine the number of significant figures in the number 0.0250015.

A) 7
B) 8
C) 4
D) 6
E) 2

Which of the following is not a hypothesis?

A) Thorough studying will raise your grades.
B) My friend's terrier dug a hole in my yard last night.
C) Driving a car is faster than walking.
D) Lead causes learning disabilities in children.
E) High-tension lines are dangerous to long-term health.

A scientific test is called a(n)

A) hypothesis
B) discussion
C) theory
D) experiment
E) natural law

How many cubes, each of volume 1mL, will be needed to fill up a 15L container?

A) 100
B) 150
C) 1500
D) 1000
E) 15000

Physical methods

A) allow separation of mixtures.
B) will separate only homogeneous mixtures.
C) are ways to cause chemical reactions.
D) will separate only heterogeneous mixtures.

When magnesium metal burns,

A) it undergoes a reduction.
B) it is a chemical change.
C) it undergoes a physical change.
D) it is reversible.
E) it produces a small amount of heat

Filtration will separate

A) a homogeneous mixture.B) substances in an alloy.
C) a gas from a liquid.
D) a solid from a liquid.Feedback: Right!
E) water from an aqueous solution.

It takes the same amount of energy to heat 100 g of water from
50ºC to 100ºC as it takes to heat 100 g of water from 500ºC to 550ºC.

A) True
B) False

An alloy is not a mixture.

A) True
B) False

Debate in science:

A) distracts from real work.
B) provide a way to air and modify theory.
C) should not occur if the science is done properly.
D) eventually cause theories to fail.

The standard (SI) unit of length is the _______.

A) yard
B) meter
C) centimeter
D) foot
E) inch

Sand and oil would form

A) a miscible liquid.
B) an alloy.
C) a homogeneous mixture.
D) a messy solution.
E) a heterogeneous mixture.

How many gallons of water is 1750 mL? 1 gal = 4 qt; 32 oz = 1 qt; 29.6 mL = 1 oz.

A) 4.73 gal
B) 473 gal
C) 0.46 gal
D) 5 gal
E) 2.16 gal

Uncertainty is measurement is:

A) as large as the measurement itself.
B) unavoidable and expected.
C) unnecessary.
D) a sign of a poorly-executed experiment.

The prefix "d" means

A) 1000
B) 10
C) 0.001
D) 100
E) 0.1

The SI unit of energy is defined as:

A) the joule.
B) work.
C) It is not defined.
D) the kilocalorie.
E) the calorie.

A substance that cannot be broken down into another substance is called

A) divisible.
B) a compound.
C) a dimer.
D) an ion.
E) an element.

Which of the following is a chemical property of copper?

A) Copper conducts heat well.
B) Copper is a soft metal.
C) Copper turns green when exposed to air.
D) Copper is a solid at room temperature.
E) Copper is used in coins.

Which of the following is not representative of a physical property?

A) Water freezes at 0ºC and 1 atm pressure.
B) Water and oil do not mix.
C) The density of water is 1 g/mL.
D) Water reacts with sodium metal.
E) Water boils at 100ºC and 1 atm pressure.

A qualitative observation:

A) depends upon color.
B) is a general description.
C) describes exact amounts.
D) is a measurement.

A physical change

A) is also called a reaction.
B) could be combustion.
C) involves a change in the fundamental composition.
D) could be an explosion.
E) could be a phase change.

Experiments are performed to

A) make observations
B) prove a theory
C) create new natural laws
D) offer support to a theory

Given a specific number of significant figures, how many uncertain digits exist in a measurement?

A) In this case, the number of uncertain digits depends upon the situation.
B) 1
C) all of them
D) two
E) 0

Convert -151ºC to fahrenheit.

A) 272ºF
B) 304ºF
C) 0ºF
D) -240ºF
E) -304ºF

With regards to significant figures, the main difference between zeroes and non-zero numbers is:

A) there is no difference.
B) non-zero numbers are sometimes significant, and zeroes are always significant.
C) zeroes are never significant.
D) zeroes are sometimes significant, and non-zero numbers are always significant.

Determine the density of a new material if 2.81 grams displace a 0.56 mL volume of water.

A) 25.2 g/cm3
B) 14.10 g/mL
C) 0.20 g/mL
D) 5.02 g/cm3

What volume of mercury will weigh the same as 150 mL of water?
The density of water is 1.0 g/mL, and the density of mercury is 13.6
g/mL.

A) 2040 mL
B) 0.09 mL
C) 11.0 mL
D) 110 mL
E) 150 mL

Learning chemistry has been compared to learning a foreign language.

A) True
B) False

Scientific models:

A) are useful tools in science.
B) never involve approximations.
C) need to be very complex.
D) are always correct.