Topic 3 - Chemical Changes (Year 10)
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What ion is produces by all alkalis in aqueous solutions?
OH-
What ion is produces by all acidic in aqueous solutions?
H+
Whatis the pH of a neutral solution?
7
Whatis the pH of an alkaline solution?
Anything above 7
Whatis the pH of a acidic solution?
Anything below 7
True or False: Alkalis have a pH of more than 7?
True, remember a neutral solution has a pH of exactly 7
What type of reaction occure when hydrochloric acid reacts with the potassium hydroxide?
Neutralisation
Complete the equation: Acid + Alkali →
Salt + Water
Complete the equation: Hydrochloric acid + Potassium hydroxide →
Potassium Chloride + Water
Define the term: Indicator
a compound that changes colour at a specific pH value or in the presence of a particular substance
Methy orange truns red in the presence of what solution?
An acidic Solution
Phenolphthalein turns pink in the presences of what solution?
Alkaline solution
Phenolphthalein turns colourless in the presences of what solution?
Acidic solution
Complete the equation: H+ + OH- →
H2O
What is the formula for hydrochloric acid?
HCl
What is the formula for sulfuric acid?
H2SO4
What is the formula for nitric acid?
HNO3
Define the term: Ionisation
The splitting up of a compound into separate smaller ions
What is the equation for the dissociation of Hydrochloric Acid (HCl)?
HCl → H+ + Cl-
Define the term: Concentration
Relative amount of a particular substance contained within a solution or mixture or in a particular volume.
Define the term: Alkali
A solution with a pH of more than 7 and that contains an excess of hydroxide (OH–) ions.
Define the term: Base
Any substance, soluble or insoluble, that neutralises an acid, forming a salt and water only.
Define the term: Soluble
Soluble means something that will dissolve
Define the term: Insoluble
Insoluble means something that will not dissolve