Question

Review Questions
4
Mixtures
1. Brass is an alloy.
a. What is an alloy?
b. Give two other examples of alloys.
C. Give three properties of brass to show that it is a mixture.
Brass
2. Classify the following types of water into two groups - compounds and mixtures:
pure water, seawater, mineral water, distilled water, muddy water, rain water
3. Substance A does not have fixed melting and boiling points. Substance B has fixed melting
and boiling points and cannot be broken down by chemical reactions. Substance C has fixed
melting and boiling points and breaks down into simpler substances when heated. Identify
which substance is:
an element;
b. a compound;
a mixture.
a.
C.
4. Which separation technique can be used to:
a. identify the colour pigments in flower petals;

Answer 1

Answer:

Copper, Aluminium, Mercury and sodium are metals. Nonmetals: Nonmetals are elements that gain electrons and form negative ions. ... Sulphur, Oxygen, Nitrogen and Chlorine are nonmetals. Metalloids: The elements whose properties are intermediate between the properties of metals and nonmetals are called Metalloids.