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Semester Test Review 3
Semester Test Review 3
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Semester test 3
Flashcards
33 cards
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Questions
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Answers
1
You can skim the fat off the top of a kettle of cold soup because fat is
made of large particles that will not pass through a filter.
made of small particles.
an emulsion that remains dispersed throughout the soup.
less dense than water and rises to the top.
2
A liquid changes rapidly into a gas at the liquid’s
condensation point.
boiling point.
melting point.
freezing point
3
When a nucleus undergoes nuclear decay by gamma rays, the atomic number of the element
increases by two.
remains the same.
decreases by one
increases by one.
4
The process of the production of lighter nuclei from heavier nuclei is called
magneticism
fusion
fission.
mass energy.
5
When a weak acid dissolves in water, the ions that recombine to form acid molecules
form a salt.
equal the pH of the solution
determine the solubility of the solution
are in equilibrium.
6
What is a salt?
a ionic compound that does not have oxide or hydroxide anion
a substance formed by mixing two strong acids together
contains more anions than cations and strongly acidic
a solution that contains a strong acid
7
When methane reacts with abundant amounts of oxygen, the products are
simple sugar and oxygen.
carbon dioxide and water.
soot and water.
carbon monoxide and water.
8
Pascal’s principle states that a fluid in equilibrium enclosed by a vessel exerts pressure
downwards.
equally in all directions
towards the vessel’s opening.
upwards.
9
A mixture that separates into different layers when you stop stirring it is
a colloid.
a solution.
a suspension.
an emulsion.
10
The kinetic theory states that the higher the temperature, the faster the
lighter particles within a substance clump together.
particles that make up a substance move.
bonds between atoms break down.
molecules of gas rush together.
11
Which state of matter has a definite volume, but not shape?
gas
plasma
solid
liquid
12
The smallest unit of a substance that behaves like the substance is
a molecule.
a compound.
an atom.
an element.
13
A balanced chemical equation shows the proportions of reactants and products necessary for
the reaction to occur.
mass to be conserved
energy use to be minimized
electrolysis to occur.
14
Carbon and other nonmetals are found in which area of the periodic table?
in the bottom rows
in the middle column of the periodic table
on the right side
on the left-most side
15
A chemical equation is balanced by changing or adding
chemical symbols.
coefficients
subscripts
reactants.
16
Which question cannot be answered by an experiment?
Did a comet impact kill the dinosaurs?
Can radiation cause cancer?
Does penicillin kill Salmonella bacteria?
Is rabies caused by a virus?
17
AgCl, is almost completely insoluble in water, force between the ion in a crystal of AgCl must
nonpolar.
extremely strong.
weaker than those in a water molecule.
partially covalent.
18
The simplest organic compound is
table sugar.
salt
aspirin.
methane.
19
Dalton’s atomic theory was accepted because
Dalton invented the electron microscope.
Dalton showed how molecules are formed.
Democritus said that it was correct.
there was evidence to support it.
20
What could you do to make yeast dough rise more slowly?
Knead the dough more vigorously
Add more yeast to the mixture.
Add mold spores to the dough
Reduce the temperature.
21
An atom’s mass number equals the number of
neutrons.
protons plus the number of neutrons.
protons.
protons plus the number of electrons.
22
Often atoms join so that each atom will have
an equal number of protons and electrons.
an outermost energy level that is full of electrons.
more electrons than either protons or neutrons.
an even number of electrons.
23
Scientific theories can be changed or replaced when
scientists make models of events or objects.
new technology is invented.
scientists decide to work on different problems.
new discoveries are made.
24
Fusion occurs when nuclei
split.
combine.
gain energy.
mutate.
25
A heterogeneous mixture is one that is
not
uniform throughout.
edible by humans.
made of two or more liquids.
easily mixed together.
26
The energy source in photosynthesis is
chemical energy.
light energy.
kinetic energy.
heat energy.
27
Alpha particles
are positively charged.
All of the above
consist of two protons and four neutrons.
can penetrate any thickness of matter.
28
Buoyant force is the _____ force exerted on an object immersed or floating on a liquid.
lateral
upward
downward
Tensile
29
Maria is 123 centimeters tall. Her height in meters is
1.23 m
12.3 m.
0123
0.123 m
30
Copper is a good conductor of electricity because its electrons
are shared between neighboring compounds.
are free to move from atom to atom.
can take on either positive or negative charges.
are positively charged.
31
A measurement that is accurate is one that
is close to the true value
contains five decimal places.
contains at least four significant figures
is as exact as possible.
32
According to modern atomic theory, it is nearly impossible to determine an electron’s exact
position.
color
mass.
charge
33
A scientific theory is an explanation that
has been published in a journal or book.
has been tested by many observations.
a scientist has tested with an experiment.
predicts what will happen.
