key words Flashcards
(25 cards)
enthalpy
energy from reaction
endothermic reactions
take in energy to proceed.
exothermic reactions
give out heat to proceed. e.g. temp goes up
neutralization of acids
gives out energy
combustion
burning in oxygen give out light and heat
respiration
glucose + oxygen react in the mitochondria of the cell to produce energy for life
fireworks
the explosion gave out a lot of heat and energy
activation energy
a minimum amount of energy needed to start a reaction
catalysts
substances that speed up a chemical reaction but don’t get used up
enzymes
are biological catalysts made up by living organisms to speed up processes
decomposes
breaks down into smaller substances
independent
the one thing I can change
fair test
has controlled variable and only one thing changed
controlled variables
all the things that can change but we can keep the same between experiments to make a fair test
dependent variable
the recorded outcome
solubility
the ability of a substance to dissolve in a solvent
or a measure of how much
saturation
the maximum amount that can dissolve
solution =
solvent + solute
observation
seeing, feeling, testing, measuring the outcome
atom
is the smallest part of an element that can exist
element
a substance made up of 1 type of atom
compound
2 or more elements bond together
chemical changes
when a substance changes into a new substance
precipitate
a solid is made
