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Worksheets8th Grade Science Midterm Exam
Total questions: 50
Worksheet time: 4mins
Protons and neutrons clump together to form the ___________.
atom
nucleus
electron cloud
element
Which of these is the simplest atom?
Oxygen
Hydrogen
Uranium
Chlorine
Elements that have some properties of metals and some properties of nonmetals are called __________.
metalloids
noble gases
isotopes
electrons
Elements found on the left side of the periodic table (excluding Hydrogen) are classified as what?
metalloids
nonmetals
noble gases
metals
What property refers to the amount of mass a substance has in a specific volume?
volume
boiling point
density
atomic weight
Hydrogen, Helium, and Argon are all part of which category of elements?
metals
nonmetals
metalloids
noble gases
This subatomic particle of an atom has a POSITIVE charge
electron
neutron
proton
isotope
The number of protons in an atom is the _________.
atomic mass
atomic number
nucleus
atomic symbol
The region around the nucleus occupied by orbiting electrons is called the __________.
nucleus
ozone layer
electron cloud
neutron cloud
The Rutherford Experiment helped show what about atoms?
They are the smallest unit of matter
They need a chemical reaction to form bonds
They are made up of mostly empty space
They have the same number of protons and electrons
Which of these elements is a metal?
Zirconium
Xenon
Hydrogen
Astatine
Which of the following elements is a metalloid?
Rhodium
Mercury
Antimony
Bromine
Which of the following elements would have the most electron shells?
Potassium
Gold
Radon
Radium
Which of the following elements is a nonmetal?
Iodine
Boron
Yttrium
Zinc
What is the average atomic mass of Mercury?
80
200.59
196.97
2 8 18
Mercury metal is poured into a graduated cylinder that holds exactly 22.5 mL. The mercury used to fill the cylinder weighs 306.0 g. From this information, calculate the density of mercury.
0.074 mL/g
6885 g/mL
13.6 g/mL
13 grams
A rectangular block of copper metal weighs 1896 g. The dimensions of the block are 8.4 cm by 5.5 cm by 4.6 cm. From this data, what is the density of copper?
8.92 g/cm3
0.112 g/cm3
225.71 g/cm3
15,926.4g/cm3
Which of these would Carbon Dioxide be classified as?
element
compound
heterogeneous mixture
homogeneous mixture
Which of these would root beer be classified as?
element
compound
heterogeneous mixture
homogeneous mixture
Which of these would sodium bicarbonate (baking soda) be classified as?
element
compound
heterogeneous mixture
homogeneous mixture
Which of these would stainless steel be classified as?
element
compound
heterogeneous mixture
homogeneous mixture
Which of these would salt water be classified as?
element
compound
heterogeneous mixture
homogeneous mixture
More than one atom bonded together to form a substance (e.g., oxygen – O2)
reactant
catalyst
molecule
isotope
Chemicals combining to cause new substances to be formed.
chemical change
physical change
catalyst
products
A chemical that makes a chemical reaction happen faster.
oxygen
product
catalyst
reactant
Substances that are combined to form products in a chemical reaction.
molecules
reactants
products
oxidation
The result of substances being combined in a chemical reaction.
catalyst
solution
product
reactant
A change in state of matter where no new substance is formed.
chemical change
rate of change
physical change
oxidation
A compound is broken down into its separate parts. (2H2O2-->2H2O+O2)
synthesis
decomposition
single replacement
double replacement
The atoms/ions in two compounds are switched, creating all new compounds.
(3ZnS+2AlP-->Zn3P2+Al2S3)
synthesis
decomposition
single replacement
double replacement
An element’s place in a compound is taken by another element.
(2Al+Fe3N2-->2AlN+3Fe)
synthesis
decomposition
single replacement
double replacement
Two or more reactants are combined to create a more complex product.
(2Na+Cl2-->2NaCl)
synthesis
decomposition
single replacement
double replacement
Identify the correct coefficients:
__C3H8+__O2-->__CO2+__H2O
1, 5, 3, 4
2, 3, 5, 4
1, 3, 4, 5
1, 2, 3, 4
Identify the correct coefficients:
__C6H12O6+__O2-->__H2O+__CO2
2, 6, 4, 2
1, 6, 6, 6
1, 6, 6, 4
1, 4, 4, 6
This subatomic particle of an atom has a NEGATIVE charge
electron
neutron
proton
isotope
This subatomic particle of an atom has no charge
electron
neutron
proton
isotope
Anything that has mass and takes up space.
volume
matter
molecule
solid
The basic unit of an element, this makes up all matter.
atom
proton
atomic number
isotope
Repeating horizontal rows of the periodic table that demonstrate patterns of how elements are arranged, specifically number of electron shells, are called _____________.
groups
families
periods
metalloids
Elements arranged in vertical columns of the periodic table that share the same properties are called _____________.
groups
families
periods
metalloids
An isotope is an atom of an element that is either missing or has extra _____________.
protons
neutrons
electrons
electron shells
In a chemical reaction, the number of atoms in the combined reactants must equal the number of atoms in the combined products. This is an example of what?
Properties of Elements
Newton's Laws of Motion
Law of Conservation of Matter
The Rutherford Experiment
The difference between a physical and a chemical change is that a chemical change produces ______________.
ions
a new substance
oxygen
a compound
To prove that a chemical change has taken place, you should test the _________ of the substance at the end of your experiment?
atomic mass
nucleus
properties
reactivity
Which of these are things you might see that would show a chemical change is taking place?
temperature change
change in state of matter
vaporization (forming of a gas)
evaporation
d=vm is the formula used to calculate what?
volume
decomposition
density
mass
A(n) ________ is a pure substance that can chemically be broken down.
element
compound
mixture
isotope
Two or more substances combined physically (not chemically) and can be separated through physical means.
compound
molecule
mixture
pure substance
A mixture that has a constant composition and appears the same throughout is considered to be _____________.
heterogeneous
homogeneous
reactive
a solid
Characteristics of elements that help to identify what they are.
periods
groups
properties
isotopes
