Year 9 Matter, Atoms, Ions, pH

Question 1

What is it that makes Noble gases so special compared to other elements?

Accepted Answer

They do not naturally react with any other chemicals.

Question 2

When we added red cabbage indicator to our eggs, it turned blue then green. This showed that

Accepted Answer

egg whites are basic.

Question 3

An example of a mixture is:

Accepted Answer

Air

Question 4

An alloy is a metal that has had another substance added to it. An example of an alloy is:

Accepted Answer

Steel

Question 5

Atoms are made up of subatomic particles. The three subatomic particles are the:

Accepted Answer

Protons, neutrons and electrons

Question 6

Which heat treatment caused the metal to become the most brittle?

Accepted Answer

Quenching

Question 7

An example of an element is:

Accepted Answer

Carbon

Question 8

Which metal is not a solid at room temperature?

Accepted Answer

Mercury

Question 9

Some atoms will give up electrons, others will receive them. When this happens, the atoms form:

Accepted Answer

Ions

Question 10

Two of the subatomic particles are electrically charged. The particles and their charges are:

Accepted Answer

Protons +1, electrons -1

Question 11

The atom that gives up an electron and becomes positive is known as the:

Accepted Answer

Cation

Question 12

An example of a compound is:

Accepted Answer

Water

Question 13

Which of the following is a quality of metals?

Accepted Answer

Lustrous

Question 14

The substance we use to observe a colour change based on pH is called an:

Accepted Answer

Indicator

Question 15

Metals are held in place by a sea of what kind of electrons?

Accepted Answer

Delocalised

Questions 15