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WorksheetsChemistry Unit Test (2021)
Total questions: 45
Worksheet time: 1hrs 3mins
What type of subatomic particles are found in the cloud surrounding the nucleus of an atom?
neutrons
electrons
protons
reactions
The atomic mass is calculated by adding __ and ___
protons & electrons
electrons in the cloud
protons & neutrons
If two substances are mixed and a gas was produced, what is this a sign of?
a physical change
a chemical change
no change
What happens if there is a temperature change when you mix two substances together?
a physical change has occurred
nothing has happened
a chemical change has occurred
When two atoms bond together they make
an element
a compound
a nucleus
Which of the following are examples of a physical change?
all of these examples are physical changes
ice melting
freezing juice
tearing paper
In a reaction A + B ----> C, reactant A has 5 grams and product C has 9 grams. How many grams should reactant B have?
4 g
5 g
9 g
14 g
Which of the following is the definition of an ionic compound?
A transfer of electrons between a metal and a nonmetal
A sharing of electrons between a metal and a nonmetal
A transfer of electrons between a metal and a metal
A sharing of electrons between a nonmetal and a nonmetal
Lithium and Sodium are both in Group 1 of the periodic table so they
are both nonmetals and form covalent bonds
have one energy level and similar properties
have one valence electron and similar properties
Coefficients tell you the number of
protons
valence electrons
atoms
molecules
During a chemical reaction
the reactants disappear
new mass is added to the reactants
something new is made
energy is always released
The products in a reaction are
found after the arrow
found before the arrow
bigger than the reactants
smaller than the reactants
Which of the following is a balanced equation?
2 Na + 2 Cl2 --> 2 NaCl
1 Na + 1 Cl2 --> 1 NaCl
2 Na + 1 Cl2 --> 2 NaCl
When a nonmetal and a metal bond together they form
an Ionic Bond
a Covalent Bond
a Metallic Bond
In a chemical reaction, no new atoms are created, and no atoms are destroyed.
How many Carbons are present on the reactant side?
1
2
3
4
Why are chemical equations always balanced? Select ALL that apply.
Matter cannot be created.
Matter cannot be destroyed.
Matter can only be rearranged/conserved.
Matter doesn't matter.
Is this chemical equation balanced? Why or why not? Choose the BEST answer.
Yes, the amount of atoms for each element are equal on both the reactant and product side.
No, the carbons are not the same number on both the reactant and product side.
No, neither the carbons or hydrogens are the same amount on both the reactant and product side.
No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.
All matter is made of what
energy
atoms
electrons
compounds
The positive particles of an atom are
electrons
positrons
neutrons
protons
The central region of an atom where its neutrons and protons are is its
nucleus
electron cloud
core
center
An atom with atomic number 6 would have how many protons
6
12
3
cannot be determined
True or False: Neutrons have a negative charge
True
False
What does the 1.00794 stand for?
Hydrogen
atomic number
atomic mass
atomic explosion
True/False: Compounds are made of two or more different elements.
True
False
What particle uniquely identifies an element?
Number of Valence Electrons
Number of Protons
Number of Electrons
Atomic Mass
The smallest particle of gold that still has all the properties of gold is
the gold nucleus.
the gold electron cloud.
the gold atom.
the individual gold protons.
Neutrons are particles of an atom that
are part of the nucleus.
have no charge
have positive charges.
When using the Periodic Table, the easiest way to determine how many protons exist in an atom of an element is to look at what?
the element's atomic mass
the element's atomic number
the element's group number
the element's period number
Based on its location on the Periodic Table, describe the element sulfer (S).
It is in the same family as carbon.
It is a metal.
It is a metalloid.
It is a nonmetal.
What three elements are in the same family as iron (Fe)?
oxygen (O), helium (He), and aluminum (Al)
potassium (K), calcium (Ca), and copper (Cu)
chromium (Cr), manganese (Mn), and cobalt (Co)
ruthenium (Ru), osmium (Os), and hassium (Hs)
Which of the following are considered pure substances?
elements and mixtures
elements and compounds
compounds and mixtures
elements only
Paula determines a property of a marble using a balance and a graduated cylinder. What property is Paula MOST likely determining by using both tools?
density
length
mass
volume
Which of the following materials is most probably a nonmetal?
a ductile, electrical conductor
a shiny ball that conducts electricity
a brittle, nonconductive solid
a dense, malleable solid
There is a block on your desk that acts as a paperweight. Its measurements are 3 cm by 4 cm by 6 cm. The block has a mass of 184.32 g. What is the DENSITY of the block? (do NOT put units in your answer, just type in the number)
0.39 g/mL
0.39 g/cm3
2.56 g/cm3
2.56 g/mL
When iron combines with oxygen in a moist environment, rust forms because of a
chemical reaction
physical reaction
change in density
change in temperature
The law of conservation of matter states that
in any reaction, energy is both created and destroyed.
the amount of matter does not change in a chemical reaction.
unnecessary matter is always removed during a chemical reaction.
energy and matter can change roles in a chemical reaction, but none are lost.
Material of density of 762 kg/m3 occupies a container volume of 99 cm3. What is its mass?
Hint: density = mass/volume
75438 kg
7.70 kg
0.13 kg
6858 kg
Diamonds have a density of 3.5 g/cm3 . How big is a diamond that has a mass of 0.10 g?
Hint: density = mass/volume
35 cm3
.35 cm3
0.002 cm3
0.03 cm3
