stuff Flashcards
what is the ‘conservation of mass’?
means the total mass of the products in a reaction will always be equal to the total mass of the reactants. because no atoms are ever destroyed or created during a reaction
what is the function of an enzyme
an enzyme is a biological catalyst , speeds up a reaction in a living cell
equation to calculate the rate of a reaction?
amount of reactant used or amount of product formed
———————————————
time
are group 1 metals soft or hard
soft , alkali metals are soft enough to be cut with a knife
which two non-metals are often included in the reactivity series?
carbon
hydrogen
what is corrosion
where something is slowly damaged or destroyed by a chemical reaction
what is an exothermic reaction
where energy goes out to the surroundings , usually in the form of heat
name 3 greenhouse gases
carbon dioxide
methane
water vapour
how do you convert a length in m to mm
x1000
what is an atom
the smallest particle of a chemical element that can exist
what charge do protons have
a positive charge
what charge do electrons have
a negative charge
