Page 54 - ICC Science Dictionary (spreads)

Word Definition Topic(s) Word Definition Topic(s)

rate of The amount of change in the size P5 real image An image that is formed where P6
change of a quantity each second. the rays of light are focused.

rate of A measurement of how quickly a C1 receptor Organ, tissue or cell that detects a B5
reaction reaction takes place. stimulus.

raw material Basic material that goods are C10 recessive Describes the variant of a gene for B6
made from such as crops, metals, a particular characteristic which
wood and animal products such is masked or suppressed in the
as wool and leather. presence of the dominant variant.
ray diagram Diagram that represents the P6 A recessive gene will remain
direction and angle of travel of light. dormant unless it is paired with
another recessive gene.
reactant A substance that reacts together TC3, TB5, C1,
with another substance to form C3, C4, C5, recessive Alternative form of a gene that B6
products during a chemical C6 allele is expressed only if a dominant
reaction. allele of that gene is not present.
An organism must have two
reaction Force exerted in the opposite P5 copies of a recessive allele for that
force direction to an action force. allele to be expressed.
reaction The sequence of reactions needed C3, C6 recycling Reusing materials or reprocessing TC1, TC6, B7a,
pathway to produce a desired product from waste materials to produce new B7b, C9, C10
a particular set of raw materials. materials.
reaction Chart showing how the energy of C6 red blood The blood cell which contains the B2
Profile reactants and products changes cell pigment haemoglobin responsible
during a reaction. for the transport of oxygen.

reactive The tendency of a substance to C4, C7, C10 redox When reduction and oxidation C4
undergo a chemical reaction. reaction take place at the same time.

reactivity A measure of how vigorously a TC3, TC4, C4 red-shift The change in wavelength of light P8
substance will react. The more from a distant star moving away
reactive it is, the greater its from Earth.
reactivity and the more vigorous
its reactions will be. reduce A substance is reduced if it loses C10
oxygen or gains electrons.
reactivity A list of elements in order of C4
series their reactivity, usually from most
reactive to least reactive.