BTEC Applied Science L2 Unit 2
Atom - Answer-The smallest part of an element that can exist
Elements - Answer-Are arranged into groups with similar properties
Periodic Table - Answer-The names and symbols of the elements are shown here
Electron - Answer-A negatively charged subatomic pa...
BTEC Applied Science L2 Unit 2
Atom - Answer-The smallest part of an element that can exist
Elements - Answer-Are arranged into groups with similar properties
Periodic Table - Answer-The names and symbols of the elements are shown here
Electron - Answer-A negatively charged subatomic particle
Proton - Answer-A subatomic particle that has a positive charge and that is found in the nucleus of an
atom
Neutron - Answer-A subatomic particle that has no charge and that is found in the nucleus of an atom
Atomic number - Answer-The number of protons in the nucleus of an atom and the number of electrons
Mass number - Answer-The total number of protons and neutrons in the nucleus of an atom
Alkali metals - Answer-Any metal in Group 1 of the periodic table
Halogens - Answer-Non-metals in Group 7 of the periodic table
Molecules - Answer-Groups of two or more atoms held together by chemical bonds
Chemical formula - Answer-Gives the symbols for each element and the number of atoms of each
element in a unit of the compound
Ion - Answer-A charged particle formed when an atom loses or gains electrons
Reactants - Answer-Are starting substances that react together in a chemical reaction
Products - Answer-The substances that are formed (or produced) by the chemical reaction.
Balanced chemical equation - Answer-has the same number of atoms of each element on both sides of
the equation
State symbols - Answer-Show the physical state of that substance; (s), (l), (aq) or (g).
Law of conservation of mass - Answer-No atoms are lost or made during a chemical reaction, so the total
mass of the products is equal to the total mass of the reactants
Rate of reaction - Answer-A measure of how quickly a reactant is used up, or a product is formed
Successful collision - Answer-Reactant particles must collide with each other AND the particles must have
enough energy for them to react
Activation energy - Answer-The minimum amount of energy needed for a collision to be successful
If concentration is increased... - Answer-the reactant particles become more crowded, the frequency of
collisions between reactant particles increases, the rate of reaction increases
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