end of year revision science Flashcards
A starting material in a chemical reaction
Reactants
Ending materials in a chemical reaction.
Products
word equation
an equation in which the reactants and products in a chemical reaction are represented by words
chemical equation
an equation that uses chemical formulas and symbols to show the reactants and products in a chemical reaction
Hydrocarbons
Compounds composed of only carbon and hydrogen
Limewater
test for carbon dioxide
Hydrogen + Oxygen ->
water
Hydrogen fuel cell
generates electricity by reacting hydrogen with oxygen
Oxidation
A chemical change in which a substance combines with oxygen, as when iron oxidizes, forming rust
metal + oxygen ->
metal oxide
Conservation of mass
the principle stating that matter is not created or destroyed during a chemical reaction
Incomplete combustion
When a fuel burns in insufficient oxygen, producing carbon monoxide as a product.
Catalytic converter
a device that reduces carbon monoxide emissions from vehicles.
Chemical propertie
how a substance reacts with other substances
Acid rain
Rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water.
Chemical formula
shows the elements in the compound and the ratio of atoms
Periodic Table
A chart of the elements showing the repeating pattern of their properties
Alkali metals are in…
group 1
Halogens are in………..
group 7
Nobel gases are in………
group 8
Melting point
The temperature at which a solid becomes a liquid
Boiling point
The temperature at which a liquid changes to a gas
Freezing point
The temperature at which a liquid changes into a solid
Periods
Horizontal rows on the periodic table
