Chemistry Spring Term AP2 - Acids and Alkalis Flashcards
What is a universal indicator?
an indicator that can be used to measure the approximate pH of a solution
Name 4 properties of alkalis
- is bitter in taste and feels soapy.
- turns litmus paper blue.
- has a pH value of more than 7.
- always contains hydroxide (OH) which is very reactive
Name 4 properties of acids
- are sour in taste and can be corrosive
- turns litmus paper red
- has a pH of under 7
- always contains hydrogen (H) which is very reactive
What are the products of neutralisation?
salt + water
Which 7 elements are diatomic molecules?
Hydrogen
Nitrogen
Fluorine
Oxygen
Iodine
Chlorine
Bromine
Have No Fear Of Ice Cold Beer
What is the difference between universal indicator and litmus paper?
Universal Indicator paper displays a variety of colors over a wide pH range, unlike litmus paper which only shows 2 colours
What is the difference between a base and an alkali?
A base is a something that react with an acid to form water and a salt. An alkali is any base that is soluble in water.
All alkalis are bases, but all bases are not alkalis.
What is a metal oxide?
the metal bonded with oxygen
How do you name the salt formed in neutralisation?
The first part of the salt comes from the first word in the name of the base and the name of the acid makes the second word
salt made from hydrochloric acids end in chloride, for sulphuric acids sulphates and for nitric acids, nitrates
Give one example of a base
(that is not an alkali)
copper hydroxide
Give an example of an alkali
sodium hydroxide
Do bases have a pH
Yes, they do
What salt does calcium hydroxide + hydrochloric acid produce?
calcium chloride
What salt does magnesium oxide + nitric acid produce?
magnesium nitrate
What salt would sodium hydroxide + nitric acid produce?
sodium nitrate
What salt does magnesium hydroxide + hydrochloric acid produce?
magnesium chloride
What salt does magnesium hydroxide + nitric acid produce?
magnesium nitrate