C4-Chemical changes Flashcards
How can you measure the pH of the solution
Universal indicator
– pH probe – attach to a pH meter can be used to measure pH electronically
What is an alkali
A base that dissolves in water
What do you get when you add an acid and a metal carbonate
acid+metal carbonate—>salt+water+carbon doixide
What are metal oxides and metal hydroxides
Alkali when they dissolve in water
What is an acid
A substance that forms and Acrise solution with pH less than seven
-Acids form H plus ions and water
What is an alkali
A bass that dissolves in water to form a solution with a PH greater than seven
– alkalis form 0H- ions in water
Is the neutralisation reaction
Acid plus base equals salt plus water
What do strong acids do in water
Ionise completely
What do you weak acids do in water
They do not ionise completely and only a small proportion of acid particles dissociate to release H+ ions
What happens to the concentration of H plus ions as one decreases on the pH scale
For every decrease of one of the pH scale, the concentration of H plus ions increases by a factor of 10
What do you get when you add an acid + metal oxide
Acid + metal oxide —> Salt+ water
What do you get when you add an acid to a metal hydroxide
Acid+metal hydroxide—>salt+water
What is the reactivity series
-Potassium =please – sodium =stop – lithium=linking – calcium=clapped – magnesium=mandem – carbon=cos – Zinc=zebras – iron=in – hydrogen=hot – copper=conditions
What Do you get when you add a metal and water
Metal +water —>Metal hydroxide + hydrogen
Do you get when you add a metal to an acid
Acid + metal—>Salt + hydrogen
