Daily Test Preparation Grade 8

Look at the diagram. It shows part of the Periodic Table. Write down the chemical symbol for the element which has the electronic structure 2.8.4.

Write down the chemical symbol for an element in the same group as B.

Hydrogen and oxygen react together to make molecules of water.

Write down the type of bonding in a water molecule.

• Ionic

• Covalent

• Giant

• Simple

Angelique investigates four sounds A, B, C and D using an oscilloscope. Look at her oscilloscope traces. Choose the loudest sound.

• A

• B

• C

• D

Choose the sound with the highest pitch.

• A

• B

• C

• D

Which of these will make the sound louder?

• increasing the frequency

• decreasing the frequency

• increasing the amplitude

• decreasing the amplitude

Which of these increases the pitch of the sound?

• increasing the frequency

• decreasing the frequency

• increasing the amplitude

• decreasing the amplitude

Stars can be classified according to their properties.

Look at the table of the properties of some stars.
Rigel is a star with:

• mass 18 times that of the Sun

• luminosity 66000 times that of the Sun.

Write down the colour of Rigel.

Scientists have developed a model to explain how star systems form. Look at the picture for the information.
Write down the name given to clouds of dust and gas that collapse due to gravity.

Scientists have developed a model to explain how star systems form. Look at the picture for the information.
Charon is a satellite moon of the dwarf planet Pluto.

Use the model to suggest how Charon may have been formed.