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WorksheetsReview 1,2,3
Total questions: 47
Worksheet time: 24mins
Which of the following is an extensive property of matter?
melting point
boiling point
volume
density
Which of the following is an intensive property of matter?
amount of energy
density
volume
mass
The two most important properties of all matter are
the ability to carry an electric current well and to hold electric charge.
taking up space and having mass.
being brittle and hard.
being malleable and ductile.
An atom is
the smallest unit of matter that maintains its chemical identity.
the smallest unit of a compound.
always made of carbon.
smaller than an electron.
A compound is
a pure substance that cannot be broken down into simpler, stable substances.
a substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances.
the smallest unit of matter that maintains its chemical identity.
any substance, whether it is chemically bonded or not.
A measure of the quantity of matter is
density.
weight.
volume.
mass.
Which of the following is not a physical change?
grinding
cutting
boiling
burning
A chemical change occurs when
dissolved minerals solidify to form a crystal.
ethanol is purified through distillation.
salt deposits form from evaporated seawater.
a leaf changes color in the fall.
A physical change occurs when a
a. peach spoils.
b. silver bowl tarnishes.
c. bracelet turns your wrist green.
d. glue gun melts a glue stick.
Nitrogen monoxide and oxygen, both colorless gases, form a red-brown gas when mixed. Nitrogen monoxide and oxygen are called the
products.
equilibria.
synthetics.
reactants.
Under ordinary conditions of temperature and pressure, the particles in a gas are
closely packed.
very far from one another.
held in fixed positions.
unevenly distributed.
What happens to the energy in a substance when it changes state?
It is destroyed.
It is changed into matter.
It changes form, but is neither destroyed nor increased.
The energy remains unchanged.
The only pure substance listed below is
bread dough.
vinegar (5% acetic acid).
vitamin C (ascorbic acid).
seawater.
A homogeneous mixture is also called
chemically bonded.
a compound.
a solution.
a solute.
Which of the following is an example of a heterogeneous mixture?
a gold ring
sweet tea
granite
iron
Which of the following is an example of a homogeneous mixture?
air
orange juice
raw milk
marble
All of the following are steps in the scientific method except
observing and recording data.
forming a hypothesis.
discarding data inconsistent with the hypothesis.
developing a model based on experimental results.
A statement that can be tested experimentally is a
variable.
model.
generalization.
hypothesis.
All of the following are examples of units except
mass.
kilometer.
gram.
ounce.
Which of these metric units is used to measure mass?
m
mm
g
L
The quantity of matter per unit volume is
mass.
weight.
inertia.
density.
The most appropriate SI unit for measuring the length of an automobile is the
millimeter.
kilometer.
meter.
liter.
0.25 g is equivalent to
250 kg.
250 mg.
0.025 mg.
0.025 kg.
27. 1.06 L of water is equivalent to
0.001 06 mL.
10.6 mL.
106 mL.
1060 mL.
If 1 inch equals 2.54 cm, how many centimeters equal 1 yard?
0.0706 cm
14.2 cm
30.5 cm
91.4 cm
These values were recorded as the mass of products when a chemical reaction was carried out three separate times: 8.83 g; 8.84 g; 8.82 g. The mass of products from that reaction is 8.60 g. The values are
accurate, but not precise.
precise, but not accurate.
A chemist obtained the values 5.2246 g, 5.2353 g, and 5.2501 g for the mass of a sample. Without knowing the true mass of the sample, it can be said that these values have
good precision.
good accuracy.
poor precision.
poor accuracy.
The number of significant figures in the measurement 0.000 305 kg is
2.
3.
6.
7.
Which of these measurements has been expressed to three significant figures?
0.052 g
0.202 g
3.065 g
500 g
Using a metric ruler with 1 mm divisions, the sides of a rectangular piece of plywood were measured as 3.54 cm and 4.85 cm, which corresponds to an area of 17.1690 cm². Which of these shows the area expressed correctly?
17.1 cm²
17.169 cm²
17.17 cm²
17.2 cm²
Three samples of 1.12 g, 1.8 g, and 1.562 g are mixed together. The combined mass of the three samples, expressed to the correct number of significant figures, would be recorded as
4.4 g
4.48 g
4.482 g
4.5 g
The principles of atomic theory recognized today were conceived by
Avogadro.
Bohr.
Dalton.
Rutherford.
Which of the following is not part of Dalton's atomic theory?
Atoms cannot be divided, created, or destroyed.
The number of protons in an atom is its atomic number.
In chemical reactions, atoms are combined, separated, or rearranged.
All matter is composed of extremely small particles called atoms.
Which concept in Dalton's atomic theory has been modified?
All matter is composed of atoms.
Atoms of different elements have different properties and masses.
Atoms can combine in chemical reactions.
Atoms cannot be divided.
Experiments with cathode rays led to the discovery of the
proton.
nucleus.
neutron.
electron.
Whose series of experiments identified the nucleus of the atom?
Rutherford
Dalton
Chadwick
Bohr
Because a few alpha particles bounced back from the foil, Rutherford concluded that they were
striking electrons.
indivisible.
repelled by densely packed regions of positive charge.
magnetic.
Carbon-14 (atomic number 6), the radioactive nuclide used in dating fossils, has
6 neutrons.
8 neutrons.
10 neutrons.
14 neutrons.
Phosphorus-33 (atomic number 15) contains
33 protons.
18 neutrons.
33 neutrons.
18 protons.
The number of atoms in 1 mol of carbon is
6.022 × 10²²
6.022 × 10²³
5.022 × 10²²
5.022 × 10²³
Avogadro's number is
the maximum number of electrons that all the energy levels can accommodate.
the number of protons and neutrons that can fit in the shells of the nucleus.
the number of particles in 1 mole of a pure substance.
the number of particles in exactly 1 gram of a pure substance.
The mass of a sample containing 3.5 mol of silicon atoms (atomic mass 28.0855 amu) is approximately
28 g.
35 g.
72 g.
98 g.
How many moles of atoms are in 50.15 g of mercury (atomic mass 200.59 amu)?
0.1001 mol
0.1504 mol
0.2500 mol
0.4000 mol
A prospector finds 39.39 g of pure gold (atomic mass 196.9665 amu). She has
1.204 × 10²³ atoms of Au.
2.308 × 10²³ atoms of Au.
4.306 × 10²³ atoms of Au.
6.022 × 10²³ atoms of Au.
Given: 3.5 mol Si × (28.0855 g Si / 1 mol Si) = ___ g Si. Fill in the blank with the correct answer.
98.3 or 98 g Si
85.2 g Si
112.4 g Si
75.0 g Si
Given: 50.15 g Hg × (1 mol Hg / 200.59 g Hg) = ___ mol Hg. Fill in the blank with the correct answer.
0.2500 mol Hg
0.4000 mol Hg
0.1250 mol Hg
0.5000 mol Hg
Given: 39.39 g Au × (1molAu/196.9665gAu) × (6.022×1023atomsofAu/1molAu) = ___ atoms of Au. Fill in the blank with the correct answer.
1.204 × 10^23 atoms of Au
2.410 × 10^23 atoms of Au
3.019 × 10^22 atoms of Au
7.890 × 10^24 atoms of Au
