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WorksheetsChemistry Unit Review
Total questions: 56
Worksheet time: 37mins
What's the charge of a proton?
Positive
Neutral
Negative
What's the charge of an electron?
Positive
Neutral
Negative
What's the charge of a neutron?
Positive
Neutral
Negative
If you add thermal energy to a solid, it first becomes....
a solid
a liquid
a gas
a plasma
Oxygen is...
an element
a compound
a homogeneous mixture
a heterogeneous mixture
Salt is...
an element
a compound
a homogeneous mixture
a heterogeneous mixture
A pile of leaves is...
an element
a compound
a homogeneous mixture
a heterogeneous mixture
Hydrogen is...
an element
a compound
a homogeneous mixture
a heterogeneous mixture
The air we breathe is...
an element
a compound
a homogeneous mixture
a heterogeneous mixture
Milk is...
an element
a compound
a homogeneous mixture
a heterogeneous mixture
Tearing a sheet of paper is a....
Physical Change
Chemical Change
Physical Property
Chemical Property
Water boiling into steam is a...
Physical Change
Chemical Change
Physical Property
Chemical Property
The color of ink is a...
Physical Change
Chemical Change
Physical Property
Chemical Property
Wood burning in fire is a...
Physical Change
Chemical Change
Physical Property
Chemical Property
Baking chocolate cupcakes is a...
Physical Change
Chemical Change
Physical Property
Chemical Property
Dissolving sugar in hot water is a...
Physical Change
Chemical Change
Physical Property
Chemical Property
Combining vinegar and baking soda to produce carbon dioxide and other chemicals is a...
Physical Change
Chemical Change
Physical Property
Chemical Property
Fireworks having the ability to combust is a...
Physical Change
Chemical Change
Physical Property
Chemical Property
When wood burns in a fire, __________.
wood evaporates
mass is lost
mass is gained
new substances are formed
With the exception of water, matter __________ when it gets hotter.
expands
contracts
A material with a definite volume and definite shape is a __________.
solid
liquid
gas
A material with NO definite volume and NO definite shape is a __________.
solid
liquid
gas
A material with a definite volume and NO definite shape is a __________.
solid
liquid
gas
Plasma is a state of matter that has __________ particles.
charged
closely packed
When vinegar and baking soda react, the reaction absorbs energy from its surroundings, which causes nearby thermometers to read a colder temperature. This is an example of a __________ reaction.
endothermic
exothermic
When a wood log burns, the reaction releases energy into its surroundings, which causes nearby thermometers to read a warmer temperature. This is an example of a __________ reaction.
endothermic
exothermic
All matter is made of tiny particles called __________.
nuclei
protons
atoms
masses
Most of an atom's mass is found in the __________.
nucleus
proton
neutron
electron
Most of an atom's volume is __________.
in the nucleus
empty space
visible
in the proton
The atoms or molecules in solids have no motion. T or F.
True
False
Molecules in the gas phase move faster than the same molecules move in the liquid phase. T or F.
True
Fasle
There is enough energy in the air at room temperature to change some liquids to gasses. T or F.
True
False
In the real world, electrons aren't in any one definite spot at any given time, but are spread all around the atom in a "cloud of probability." T or F.
True
False
Compared to an atom, a light wave is __________.
huge
tiny
about the same size
__________ are groups of atoms, held together by bonds.
Elements
Molecules
Isotopes
Nuclei
The more energy an electron has, the __________ it lives from the center of the atom.
farther out
closer in
__________ atoms are slow.
Cold
Hot
A substance that undergoes a physical change, like melting, is NOT the same substance after. T or F.
True
False
In the chemical equation pictured here, CH4 is a...
Reactant
Product
In the chemical equation pictured here, 202 is a...
Reactant
Product
In the chemical equation pictured here, 2H2O is a...
Reactant
Product
In the chemical equation pictured here, CO2 is a...
Reactant
Product
Identify how many Carbon (C) atoms are on the LEFT side of the chemical equation pictured here.
1
2
3
4
6
Identify how many Hydrogen (H) atoms are on the LEFT side of the chemical equation pictured here.
1
2
3
4
6
Identify how many Oxygen (O) atoms are on the LEFT side of the chemical equation pictured here.
1
2
3
4
6
In a chemical equation, the number of atoms on the left can sometimes be different than the number of atoms on the right. T or F.
True
False
In science, "theory" is another name for "guess." T or F.
True
False
Matter can be created or destroyed. T or F.
True
False
Which atomic theory was theorized 1st?
Atoms are made of empty space with electrons around a positively charged mass. The terms nucleus and protons are introduced.
Negatively charged particles are called electrons. The atom is thought of as electrons scattered inside a positively charged.
Electrons exist in a region around the nucleus called the electron cloud, instead of energy levels.
Each type of matter is only made up of one type of atom. Atoms are too small to be seen.
Electrons are arranged in energy levels. Lower energy levels are close to the nucleus and higher energy levels are farther away from the nucleus.
Which atomic theory was theorized 2nd?
Atoms are made of empty space with electrons around a positively charged mass. The terms nucleus and protons are introduced.
Negatively charged particles are called electrons. The atom is thought of as electrons scattered inside a positively charged.
Electrons exist in a region around the nucleus called the electron cloud, instead of energy levels.
Each type of matter is only made up of one type of atom. Atoms are too small to be seen.
Electrons are arranged in energy levels. Lower energy levels are close to the nucleus and higher energy levels are farther away from the nucleus.
Which atomic theory was theorized 3rd?
Atoms are made of empty space with electrons around a positively charged mass. The terms nucleus and protons are introduced.
Negatively charged particles are called electrons. The atom is thought of as electrons scattered inside a positively charged.
Electrons exist in a region around the nucleus called the electron cloud, instead of energy levels.
Each type of matter is only made up of one type of atom. Atoms are too small to be seen.
Electrons are arranged in energy levels. Lower energy levels are close to the nucleus and higher energy levels are farther away from the nucleus.
Which atomic theory was theorized 4th?
Atoms are made of empty space with electrons around a positively charged mass. The terms nucleus and protons are introduced.
Negatively charged particles are called electrons. The atom is thought of as electrons scattered inside a positively charged.
Electrons exist in a region around the nucleus called the electron cloud, instead of energy levels.
Each type of matter is only made up of one type of atom. Atoms are too small to be seen.
Electrons are arranged in energy levels. Lower energy levels are close to the nucleus and higher energy levels are farther away from the nucleus.
Which atomic theory was theorized 4th?
Atoms are made of empty space with electrons around a positively charged mass. The terms nucleus and protons are introduced.
Negatively charged particles are called electrons. The atom is thought of as electrons scattered inside a positively charged.
Electrons exist in a region around the nucleus called the electron cloud, instead of energy levels.
Each type of matter is only made up of one type of atom. Atoms are too small to be seen.
Electrons are arranged in energy levels. Lower energy levels are close to the nucleus and higher energy levels are farther away from the nucleus.
Which atomic theory was theorized 5th?
Atoms are made of empty space with electrons around a positively charged mass. The terms nucleus and protons are introduced.
Negatively charged particles are called electrons. The atom is thought of as electrons scattered inside a positively charged.
Electrons exist in a region around the nucleus called the electron cloud, instead of energy levels.
Each type of matter is only made up of one type of atom. Atoms are too small to be seen.
Electrons are arranged in energy levels. Lower energy levels are close to the nucleus and higher energy levels are farther away from the nucleus.
The state of matter with the LOWEST energy is...
Solid
Liquid
Gas
Plasma
The state of matter with the HIGHEST energy is...
Solid
Liquid
Gas
Plasma
