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Worksheets8th Grade Final Chemistry Test
Total questions: 45
Worksheet time: 23mins
What is the formula for density?
Density = Volume/Mass
Density = Mass/Volume
Density = Mass-Volume
Density = Volume-Mass
In what phase of matter are particles (atoms or molecules) spread apart, and can change shape and volume
Solid
Liquid
Gas
None of the above
Where is the atomic mass located?
What is the atomic mass?
Below the Elemental Symbol (O)
Above the Elemental Symbol (O)
What is Oxygen?
How do you calculate how many Neutrons are in a Nucleus?
You don't
Atomic Mass/Atomic Number
Atomic Number - Atomic Mass
Atomic Mass - Atomic Number
Where do you find the Electrons of an atom if this is a Neutral atom?
Above the Elemental Symbol (O)
Below the Elemental Symbol (O)
What is the atomic number?
What is Oxygen?
What is the definition of malleability?
the ability to be stretched into a thin wire
the ability to be hammered into a thin sheet
measure of a material's ability to conduct an electric current
anything that has mass and volume
What is the definition of ductility?
the ability to be stretched into a thin wire
the ability to be hammered into a thin sheet
measure of a material's ability to conduct an electric current
anything that has mass and volume
Atoms of the same element always have the same number of which subatomic particle in their nucleus?
Neutrons
Protons
Positive Ions
Valence Electrons
In a neutral atom, what two subatomic particles equal each other?
Neutrons and Protons
Protons and Neutrons
Electrons and Protons
Electrons and Neutrons
Who was the scientist to first organize the elements in the periodic table?
Henry Moseley
Mrs. Gibson
Dmitri Mendeleev
Ms. Verploegen
The periodic table was arranged by atomic mass before it was rearranged by ______________.
atomic mass
neutrons
atomic number
electrons
Elements in the same column have similar properties because they have the same number of ____________________
electrons
protons
valence electrons
orbitals
What happens to the molecules when a solid is being heated?
Nothing will happen to the molecule
The molecules will begin to more faster
The molecules will begin to more slower
The molecules will begin to increase in density
The atomic number of an element tells you the atom's ____________
Mass
Number of neutrons and protons in a neutral atom
Number of protons and electrons in a neutral atom
Volume
What is the smallest unit of an element that retains the properties of that element?
Neutron
Proton
Atom
Electron
How do you determine the number of orbitals an Element has?
By the periods/rows
By the groups/family/columns
How do you determine the number of valence electrons an Element has?
By the periods/rows
By the groups/family/columns
How are Elements similar to those in the same group on the periodic table?
They have the same atomic mass
They have the same number of valence electrons
They have the same number of electrons
They have the same number of protons
What group is highlighted?
Alkali
Alkaline
Halogens
Noble Gases
What group is highlighted?
Alkali
Alkaline
Halogens
Noble Gases
What are columns?
Periods
Family/Groups
What are the most reactive family of metals?
Alkali
Alkaline
Halogen
Noble Gas
Valence electrons are 1-18 and are on the outer shell of an atom
True
False
Orbital shells align with the columns of the periodic table
True
False
What are valence electrons?
All electrons
Electrons on the outer orbital
Electrons on the shell closest to the nucleus
Victorian electrons
Define Metals
Elements below and to the left of the stair-step line
Elements above and to the right of the stair-step line
Elements touching the stair-step line
Elements below the periodic table
You can find the amount of shells in an element by looking at the period number
True
False
Valence electrons can be found by looking at the column number and orbitals can be found looking at the row number
True
False
Which chemical equation supports the Law of Conservation of Matter?
Fe + O2 → Fe2O3
4 HgO → 2 Hg + O2
2 SnO + O2 → 3 SnO2
2 Zn + SO2 → 2 ZnO + S
What side is the products on?
RIGHT of the arrow
LEFT of the arrow
What is the coefficient known as...
The "big" number before the elements
The small number behind the elements
According to the law of conservation of mass, which of these statements is true?
Matter cannot be changed at all
Matter cannot be created or destroyed in a chemical reaction
Matter can be created or destroyed in a chemical reaction.
Balance this equation: Fe + O2 → Fe2O3
2 Fe + 3 O2 → Fe2O3
Fe + O2 → Fe2O3
3 Fe +4 O2 → 2 Fe2O3
4 Fe + 3 O2 → 2 Fe2O3
What is a precipitate?
2 solids turning to liquid randomly
2 solids mixed together and turn into a liquid
2 liquids mixed together and change color
2 liquids mixed together and turn into a solid
Which of the following is NOT an indicator of a chemical reaction?
Formation of a precipitate
Condensation
Color change
Evolution of gas or heat
What side is the reactants on?
RIGHT of the arrow
LEFT of the arrow
Kool-Aid powder and water can be mixed into a delicious drink because Kool-Aid has this ability
Solute
Solubility
Solvent
Solution
If you describe methane as a gas that easily catches fire, you are describing a
State of matter
Physical property
Chemical Property
Chemical formula
What is the subscript known as...
The "big" number before the elements
The small number behind the elements
Which is the best example of a pure substance?
Peanuts
Milk
Gold
Air
Which best describes a heterogeneous mixture?
Milk
Gold
Air
Trail Mix
How can pure substances be separated?
Physical Means
Chemical Means
Why is a closed container important in the Law of Consevation of Mass?
Closed container has nothing to do with science
So expirements can explode
When an expirement makes gas, the mass can be measured before and after the reaction
When an expirement makes bubbles, it wont make a mess
A student placed a small chip of limestone into a hydrochloric acid solution, and carbon dioxide gas was released. The formation of carbon dioxide gas provided evidence that:
Only a physical change had occurred
A chemical change had occurred
Only a loss of mass occurred
The formation of an element occurred
To balance a chemical equation, you can ONLY change the __________________.
Subscript
Coefficient
Element
Compound
