AK Flashcards
acid + reactive metal ->
salt + hydrogen gas
exceptions to reactive metals: gold, silver, copper
acid + metal carbonate ->
salt + water + carbon dioxide
acid + base/alkali ->
salt + water
alkali + ammonium salt ->
salt + water + ammonia
-> salt + hydrogen gas
acid + reactive metal
-> salt + water + carbon dioxide
acid + metal carbonate
-> salt + water
acid + base/alkali
-> salt + water + ammonia
alkali + ammonium salt
Define acids
Substance which dissociates in water to produce hydrogen ions (H+ ions)
Define bases
metal oxides and metal hydroxides
Define alkalis
bases that are soluble in water
Why is aqueous ammonia considered an alkali
When ammonia dissociates in water, hydroxide ions are formed
What is the reaction between acids and alkalis called
Neutralisation
What is a pH level
Measure of acidity or alkalinity of a solution
What is an indicator
Substance that has diff colours in acidic and alkaline solutions
name the unreactive metals
copper, gold, silver
these metals will not react with acids
If the gas/liquid turns red litmus paper -> blue, is it acid or alkali
alkaline
If the gas/liquid turns blue litmus paper -> red, is it acid or alkali
acid
What is the test for hydrogen gas
Gas extinguishes a lighted splint with a “pop” sound
Explain why we cannot test for the gas with a lighted splint immediately when the metal is added to the acid
The metal needs time to react with the acid
What is the test for carbon dioxide
Gas forms a white precipitate with limewater
what is the test for ammonia gas?
gas turns moist red litmus paper blue
What is limewater and the white precipitate it forms with CO2
Ca(OH)2
CaCO3
