Elements, Compounds, Mixture
This type of pure substance is made of only one kind of atom and cannot be broken down by chemical means
What is an element?
These subatomic particles have a positive charge and are located in the nucleus.
What are protons
Coal oil and natural gas are collectively known as these because they formed from the remains of ancient organisms
What are fossil fuels
Elements in the same vertical column of the periodic table belong to the same one of these.
What is a group or family?
These are the substances you start with in a chemical reaction, usually written on the left side of the arrow
What are reactants
This is a combination of two or more substances that are physically blended but not chemically bonded together
What is a mixture
These tiny, negatively charged particles orbit the nucleus in specific energy levels or clouds.
What are electrons
This type of energy resource can be replaced by nature at the same rate it is consumed
What is a renewable resource?
This number, found at the top of an element’s square, represents the number of protons in the atom
What is the atomic number
This scientific law states that matter is neither created nor destroyed, which is why equations must be balanced
What is the Law of Conservation of Mass
Saltwater is an example of this specific type of mixture, where the composition is the same throughout
What is a homogeneous mixture
You calculate the number of these neutral particles by subtracting the atomic number from the mass number
What are neutrons?
This renewable energy source uses the heat from inside the Earth to generate electricity.
What is geothermal energy
Elements located to the left of the "zigzag" line generally share these properties, like being shiny and good conductor
What are metals
In the formula 3H20 the number "3" is known as this indicating there are three molecules of water
What is a coefficient
When two or more elements chemically combine in a fixed ratio, they form this
What is a compound?
Most of an atom's mass is located here, while most of its volume is actually empty space
What is the nucleus
One major disadvantage of this nonrenewable energy source is the production of radioactive waste
What is nuclear energy
This group of elements in the far right column Group 18 is known for being unreactive and stable
What are the noble gases
This is the name for the substances that are produced or created at the end of a chemical reaction
What are products
This method is used to separate a mixture of liquids with different boiling points such as separating crude oil into gasoline and kerosene
What is distillation?
Atoms of the same element that have the same number of protons but a different number of neutrons are known by this term
What are isotopes
This specific nonrenewable resource is often found trapped between layers of rock above oil deposits and is primarily made of methane.
What is natural gas
This term describes the ability of a metal to be hammered or rolled into thin sheets like aluminum foil
What is malleability
In a chemical equation, these small numbers written below and to the right of an elements symbol tell you the exact number of atoms of that element in a molecule
What are subscripts?