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WorksheetsChemistry Diagnostic Review
Total questions: 20
Worksheet time: 10mins
How many significant figures are in the measurement 1400.50 km?
3
4
5
6
A mixture is
a combination of pure substances bonded chemically
any substance with a uniform composition
a blend of any two or more kinds of matter, as long as each maintains its own unique properties
any group of elements that are chemically bonded to one another
Expressed in correct scientific notation, 0.0630 m is
63 x 10^–3 m
6.3 x 10^2 m
6.30 x 10^–2 m
6.30 x 10^–4 m
Using a metric ruler with 1 mm divisions, the sides of a rectangular piece of plywood were measured as 3.0 cm and 5.55 cm. When calculating the area (l x w), a calculator shows the number 17.060
Which of these measurements shows this number rounded correctly using the rules of significant figures?
284 cm^2
280 cm^2
284.05 cm^2
300 cm^2
An experiment that tests only one factor at a time by using a comparison of a control group and an experimental group is:
a dependent variable
a controlled experiment
a theory
an independent variable
How many protons are present in the isotope silver-111
111
64
47
79
Most of the volume of an atom is occupied by the
nucleus
nuclides
electron cloud
protons
Mendeleev is credited with developing the first successful
periodic table
method for determining atomic number
test for radioactivity
use of X-rays
Elements in a group, or column, in the periodic table can be expected to have
similar atomic masses
similar atomic numbers
the same number of neutrons
similar chemical and physical properties
The electrons involved in the formation of a covalent bond are
transferred from one atom to another
found only in the s-orbitals
shared valence electrons
in filled orbitals
How many atoms of hydrogen are in a molecule of ammonia, NH3
1
2
3
4
Which of the following binary molecules can we expect to have a polar-covalent bond?
Br2
HCl
NaCl
O2
What is the charge of a Iron (II) ion?
11+
1+
2-
2+
Which of the following symbols identifies a substance dissolved in water?
(s)
(l)
(g)
(aq)
The coefficients in a chemical equation represent the
masses, in grams, of all reactants and products.
relative numbers of moles of reactants and products
number of atoms in each compound in a reaction
number of valence electrons involved in the reaction
Which is NOT true about chemical reactions
reaction rates may be different under different environmental conditions
some reactions require a catalyst to start
under the right conditions any two chemicals will react with one another
in the reaction both energy and matter is conserved
The reactant that is completely used up in a chemical reaction is called the:
limiting reactant
limiting product
excess reactant
excess product
If the particles in a sample of matter have an orderly arrangement and only vibrate in place, the sample is
a gas
a liquid
a solid
a mixture
If the temperature of a gas in a container is decreased, what will happen to the pressure of the gas?
it will increase
it will decrease
it will not be changed
there will be no pressure
Hydrogen gas is cooled from 452 K to 200. K. If its original volume was 1.00 L, what is its new volume?
2.26 L
0.44 L
0.785 L
1.25 L
