Science Test Chemistry Flashcards
Chemistry
What elements are in zinc hydroxide?
Zinc, hydrogen and oxygen
What elements are in zinc carbonate?
Zinc, Carbon and Oxygen
If a compounds name ends in “-ide”, what does this tell us?
That there are two elements in the compound.
If a compounds name ends in “-ate”, what does this tell us?
That there are two elements plus oxygen.
What elements are in iron sulfide?
Iron and Sulfur.
What elements are in copper chlorate?
Copper, Chlorine and Oxygen.
How do you identify a chemical change?
A new substance is made, fizzing, a colour change or a new chemical is produced.
How do you identify a physical change?
If you can reverse what has happened.
Give two examples of chemical changes
Baking a cake, fireworks going off
Give 4 examples of physical changes
Boiling, melting, dissolving, condensing
State 4 signs of a chemical reaction
Fizzing, colour change, new substance, new chemical produces
If you see bubbles form
in a chemical reaction, what
does this tell you?
A new gas has been formed
If you see cloudiness form in a chemical reaction, what does this tell you?
A solid has been made
What is meant by the
words “reactant” and
“product”?
Reactant is the chemicals that have been reacted together and the product is the chemical that has been made
What is a word
equation?
A summary of a chemical reaction
1 example of a word
equation.
Hydrochloric+Sodium-sodium+H2O
Acid Hydroxide Chloride
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 or pH paper
What are the pH values
of neutral, acid and alkali?
Acid-pH 0-6. Neutral-pH7 Alkali-pH8-14
What happens to how
acidic a solution is as the pH
decreases below 7?
It becomes more acidic the closer to pH 0 it gets
What happens to how
alkaline a solution is as the
pH increases above 7?
It gets more alkaline the closer it gets to pH14
What is a neutralisation
reaction?
When an acid and alkali mix until it is a pH 7
Name the products of
neutralisation
A salt and water
Write a word equation for neutralisation
Hydrochloricacid+sodiumhydroxide—sodiumchloride+water
