compoundss, acidss and alkalis Flashcards
chemical reactionss, acids and alkalis
complete the equation
magnesium+oxygen–>
magnesium oxide
complete the equation
zinc+oxygen–>
zinc oxide
complete the equation
carbon+oxygen–>
carbon dioxide
complete the equation
sulfur+oxygen–>
sulfur dioxide
what pH do metal oxides have
they always have a pH greater than 7
what pH do non-metals have
their pH will always be less than 7
what colour do alkaline substances go in universal indicator
purple or blue
what colour do acidic substances turn in universal indicator
yellow, orange or red
is alkaline metals or non-metals
metal
is acidic non-metal or metal
non-metal
what is the equation of the neutralisation reaction
metal oxide+acid–> salt+water
what is a base
a base is a substance that has a pH above 7 that is insoluble in water.
give an example of a base
magnesium oxide
describe ethonic acid( vinegar )
pH= orange, 3 or 4
acid
weak
describe citric acid( lemon juice )
pH= orange, 3 or 4
acid
weak
describe hydrochloric acid
pH=red, 2
acid
strong
describe sulfric acid
pH= orange, 2
acid
strong
describe ammonium hydroxide
pH= purple, 12
alkali
strong
describe sodium hydroxide
pH=purple, 12
alkali
strong
why do acids turn red, orange with universal indicator
because they all contain hydrogen ions H+, these are also known as proton donors
why do alkalis turn purple with universal indicator
because they contain hydroxide ions
OH-
what happens when an acid and alkali dissolves in water
when an acid or an alkali dissolve in water to make an aqueous(water) solution, they dissociate. This means that it was bonded to.
give one example of dissociation
HCI–>H+ and CI-
an acid equation
give another example of dissociation
NaOH–>Na+ and OH
alkali equation
how do u make water from an acid and alkali
H+ and OH- —> H2O
ion ion water
finish the equation
HCI+KOH—>
H2O+KCI
