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WorksheetsReview: Interactions of Matter Unit
Total questions: 51
Worksheet time: 47mins
The small numbers under and to the right of element symbols in a formula are called _________________.
element symbols
exponents
coefficients
subscripts
The large numbers before a chemical formula that are used as multipliers are known as __________________.
element symbols
exponents
coefficients
subscripts
The materials we start with in a reaction are known as __________________ and are found on the left side of a chemical equation.
chemicals
reactants
products
creations
The materials we end with in a reaction are known as __________________ and they are found on the right side of the chemical equation.
chemicals
reactants
products
creations
Count the atoms for each element and select the correct answer: KClO3
K = 1 Cl = 3 O = 3
K = 3 Cl = 3 O = 3
K = 1 Cl = 1 O = 3
K = 1 C = 1 l = 1 O = 3
What is the coefficient in the chemical formula?
2
N
H
3
What is the subscript in the formula for H?
2
N
H
3
Count the atoms for each element and select the correct answer:
H = 3
O = 3
H = 6
O = 1
H = 2
O = 1
H = 6
O = 3
Count the atoms for each element and select the correct answer:
H = 3
O = 3
H = 6
O = 1
H = 2
O = 1
H = 6
O = 3
Count the atoms for each element and select the correct answer:
H = 3
O = 3
H = 9
O = 9
H = 3
O = 9
H = 3
O = 1
Which part of an equation means YIELDS?
plus signs
chemical fomulas
reactants
products
arrow
three hydrogen (H)
one sulfur (S)
four oxygen (O)
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
2Mg and O2
2MgO
Mg and MgO
O and MgO
How do you determine the identity of an atom?
Protons
Protons + Neutrons
Neutrons
Valence Electrons
What group on the periodic table would you find Oxygen?
Group 1
Group 14
Group 16
Group 2
H2C3O4N5
What does the C represent?
atomic mass
atomic number
element name
chemical symbol
What does the 6 represent?
atomic mass
atomic number
element name
chemical symbol
What does 12.011 represent?
atomic mass
atomic number
element name
chemical symbol
The Modern Periodic Table of Elements is arranged by
atomic mass
atomic number
valence electrons
number of isotopes
The vertical (up and down) columns in the Periodic Table are called
groups
towers
periods
atomic numbers
Which group of the periodic table is composed of inert (non reactive) gases?
answer choices
alkali metals
alkaline earth metals
halogens
noble gases
Elements in a .................. have similar chemical properties.
period
group
row
True or False: The reactivity of metals tends to decrease as you move from left to right across the periodic table.
True
False
Name this group: These metals are the most reactive.
Name this group: These metals are the second most reactive.
These two elements have similar chemical properties to Barium (Ba).
Ca and Ra, because they are in the same group.
Cs and La, because they are in the same period number.
Ca and Y, because they are 90 degree angle.
What best describes what happens when an ice cube melts?
Molecules move faster
Molecules move slower
Molecules increase in density.
Molecules condense into the air.
Boiling water. Is this change physical or chemical?
It is a physical change.
It is a chemical change.
Melting wax. Is this change physical or chemical?
It is a physical change.
It is a chemical change.
Rusting iron. Is this change physical or chemical?
It is a physical change.
It is a chemical change.
Baking a cake. Is this change physical or chemical?
It is a physical change.
It is a chemical change.
Dissolving powder. Is this change physical or chemical?
It is a physical change.
It is a chemical change.
Shredding paper. Is this change physical or chemical?
It is a physical change.
It is a chemical change.
Freezing water. Is this change physical or chemical?
It is a physical change.
It is a chemical change.
Burning coal. Is this change physical or chemical?
It is a physical change.
It is a chemical change.
If you increase the solvent and solute does this affect the solubility?
Yes, it will go up.
No, solubility is a rate so increasing the amounts does not change the rate.
Where on the periodic table would we find elements that have the same number of valence electrons?
Same period (row - horizontal).
Same group or family (column - vertical)
Because of the Law of Conservation of Mass, chemical equations should be balanced (same atoms counts for elements in both the reactants and products)
True
False
How does a balanced equation satisfy the Law of Conservation of Mass?
The total number of atoms increases.
One or more new substances are formed.
Matter is destroyed.
The total amount of matter stays the same.
Why is it important to have a chemical reaction occur in a closed system to illustrate Law of Conservation of mass?
To let the gasses escape.
So any gasses produced do not escape.
Only way to see a chemical change.
So the precipitate does not escape.
Which best describes the molecules of a solid?
They are free floating.
They are packed tightly together.
Which is most likely a mixture?
Two atoms of the same element
One substance dissolves in another
New substance formed when atom of one element combines the the atom of another.
Solution formed when two substances chemically combine
Can temperature change the rate of solubility of a substance?
Yes, higher temperature means more solids will dissolve and less gasses will dissolve.
No, temperature does not affect solubility.
4Fe + 3O2 --> 2Fe2O3
(Check ALL answers)
Al + O2 → 2Al2O3
2C2H2 + 5O2 --> 4CO2 + 2H2O
N2+O2--> _NO
