Chemical Reactions Flashcards
(19 cards)
what are physical changes?
its a change of state ONLY, o new subtacne has been formed and its easy to reverse
what are chemical changes?
its a result of a chemical reaction, a new substance has been formed and difficult/ impossible to reverse.
what are eqautions?
a convenient way to write what changes are taking place
what does the arrow in an equation represent?
reacts to produce or yields
what to remember when writing eqautions?
WRITE THE STATES
what are the four states and also their symbols?
s- solid
l- liquid
g- gas
aq- aqueos
what is aq?
a substance that has been dissolved in water to form a solution
equations can be writtin in…
words or molecular formula
what is a balanced chemical equation?
it tells us what ratio the substance react in
what are reactants?
the substance you start with in a chemical reaction
what are products?
the final product after the reaction has occured
where the reactants on equation?
on the left of the arrow
where are the products of the eqution?
on the right of the arrow
products have different…
properties to their reactants
what are six signs a chemical reaction has happened?
gas realsed
colour change
odur produced
a temperature change (hotter or colder)
light or sound being produced
a precipitate being formed
reactants disappears
what is a precipitate?
cloudiness and when a solid that formed when two liquid being mixed
where is a catalyst written on a equation?
above the arrow
what to remember about a catalyst?
NOT A REACTANT and ONLY A PART of the reaction
what is a catalyst?
speeds up the reaction and
