Science flash cards
What elements are in zinc
hydroxide?
Zinc hydrogen and oxygen
What elements are in zinc
carbonate?
Zinc, carbon and oxygen
If a compound’s name
ends in “-ide”, what does this
tell us?
It contains the elements we can see in the name
(Usually 2 elements, unless name contains hydroxide)
If a compound’s name
ends in “-ate”, what does this
tell us?
It contains the elements we can see in the name AND oxygen
What elements are in iron
sulfide?
Iron and sulfur
How do you identify a
chemical change?
At least one new substance is made
What elements are in
copper chlorate?
Copper, chlorine and oxygen
How do you identify a
physical change?
No new substance is made
Give 2 examples of
chemical changes
Rusting and photosynthesis
Give 4 examples of
physical changes
boiling, melting, evaporating, condensing, dissolving, solidifying
State 4 signs of a
chemical reaction
At least one new substance made
(always happens)
Colour change
Change of state
Energy change (temperature goes up or down)
If you see cloudiness form in a chemical reaction, what does this tell you?
A solid has been made
If you see bubbles form in a chemical reaction, what does this tell you?
A gas has been made
What is meant by the words “reactant” and
“product”?
Reactant = chemical that react
Products = chemicals that are made
What is a word equation?
A summary of a chemical reaction
Reactants → Products
1 example of a word equation.
Hydrochloric acid + sodium hydroxide → salt and water
Name an indicator used to find the pH of solutions.
Universal indicator.
Describe how to find the pH of a solution (2 points)
Add universal indicator to substance in solution + match colour to pH chart to find pH number
What are the pH values of neutral, acid and alkali?
Acid = below 7
Neutral = 7
Alkali = above 7
What happens to how acidic a solution is as the pH decreases below 7?
It becomes more acidic
What happens to how alkaline a solution is as the pH increases above 7 ?
It becomes more alkaline
What is a neutralisation reaction ?
When an acid reacts with an alkali to form a salt and water. The pH moves towards 7
Name the products of neutralisation
A salt and water
Write a word equation for neutralisation
acid + alkali → a salt + water
