chem Flashcards
example of acid?
hydrochloric acid
sulfur acid
nitrate acid
physical properties of acid
- sour
- corrosive
- blue litmus paper to red
example of alkalis
- aqueous calcium hydroxide
- aqueous sodium hydroxide
- aqueous ammonium hydroxide
physical properties of alkalis
- bitter
- soapy
- red litmus paper to blue
example of metal?
- calcuim
- magnesium
- zinc
________+________—-)______+hydrogen
acid+metal—-)salt+hydrogen
what is the observation of acid+metal—-)salt+hydrogen
effervescence and colourless gas was obsered
how do we test for
acid+metal—-)salt+hydrogen
heat up the splint,cover up the mouth of test tube.If extinguish with ‘pop’ sound,hydrogen is present.
______+_______——–)_______+________+carbon dioxide
acid+carbonate——-)salt +water+carbon dioxide
observation for
acid+carbonate——-)salt +water+carbon dioxide
effervescence and colourless,odourless gas was observed
how to test for
acid+carbonate——-)salt +water+carbon dioxide
bublle the aqueous calcium hydroxide (limewater).If white precipitate form,carbon dioxide is present
____+______—–)_____+water
acid+alkaline——)salt + water
process of
acid+alkaline——-)salt +water
neutralisation
obeservation of
acid+alkaline——-)salt +water
- no colourless &odourless gas was observed
- felt warm
definition of chemical change?
- new substance is formed
- chemical properties are different
- difficult to reverse
different type of chemical change:
C________
combusion
definition of combusion
process in which a substance combines with oxygen in the presence of heat to form one or more new substance
word equation of combusion
reactant + oxygen ——-) products
second type of chemical change
T_________ D________
thermal decomposition
definition of thermal decomposition
a process in which a substance is broken down into two or more simpler substances when heated
word equation of thermal decomposition
reactant A——–) product B + product C
what is electrolysis?
electricty is used to break down substances into simpler substances
denfition of physical changes
- no new substances
- chemical propertiees remain unchange
- can be reversed
example of physical changes
- change in state
- breaking uo of substances into smaller pieces
- expansion and contraction
- mixing salt and water
denifition of chemical reaction
when a new substance is made,the process that place is called a chemical reaction
new substance involed in the chemicl reaction are caled reactant
equation for chemical reaction
Reactant ——-) product
left right
new substance formed are called the product
