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

Which is not an example of chemistry at work?

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

Among other things, chemists have learned ______.

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

A quantitative observation:

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

By definition, a mixture has variable

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

Why is a gas much more compressible than a solid?

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

Gases have a definite shape.

A) True
B) False

An approximation:

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

Air is

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

A set of hypotheses is called a(n)

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

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) 119000 J
C) 7600 J
D) 7.6 J
E) 6.98 J

An absolute temperature scale

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

Arrange the density of a generic substance according to state.

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

Which of the following statements is qualitative?

A) That pizza smells good!
B) I ate four slices of pizza last night.
C) That pizza cost only $10.00.
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) Pure water.
C) a compound.

Doing chemistry successfully requires

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

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

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

A homogeneous mixture is

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

A _______ may not be modified over time.

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

Round the number 14.449 to three significant digits.

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

The amount of energy required by a process depends upon

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

The scientific method:

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

Which of the following is a quantitative observation?

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

Distillation requires

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

Chemistry is a(n) _______ science.

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

Determine the number of significant figures in the number 0.0250015.

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

Which of the following is not a hypothesis?

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

A scientific test is called a(n)

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

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

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

Physical methods

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

When magnesium metal burns,

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

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

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

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

Sand and oil would form

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

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

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

Uncertainty is measurement is:

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

The prefix "d" means

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

The SI unit of energy is defined as:

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

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

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

Which of the following is a chemical property of copper?

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

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

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

A qualitative observation:

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

A physical change

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

Experiments are performed to

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

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

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

Convert -151ºC to fahrenheit.

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

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

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

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) 5.02 g/cm3
C) 14.10 g/mL
D) 0.20 g/mL

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) 0.09 mL
B) 2040 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) are always correct.
C) need to be very complex.
D) never involve approximations.