Putting things together

Which of the following is a compound?

• Duralumin

• Hydrogen

• Helium

• Carbon dioxide

Can the chemical formula of water be H3O?

• Yes

• No

What is the chemical symbol of Sulphur?

• Su

• su

• s

• S

What is the correct sequence of steps followed while doing an investigation?

1 Ask a question

2 Test the explanation

3 Check the evidence

4 Suggest an explanation

• 4,3,2,1

• 1,3,2,4

• 1,4,2,3

• 1,4,3,2

Which of the following alloys is made up by mixing a non-metal with other metals?

• Nichrome

• Sterling silver

• Stainless steel

• Bronze

Which of the following elements do not exist in the form of a molecule of an element?

• Hydrogen

• Sulphur

• Oxygen

• Carbon monoxide

Write True/False

Water shows all the properties shown by the elements from which it is made.

(a)  

Which of the following is not true for an Alloy?

• An alloy is made to enhance the properties of a pure metals.

• An alloy is not a pure metal/non-metal

• The individual properties of elements are not retained in an alloy

Which property of metals is most suitable for making a wire mesh?

(a)  

Which of the following is not a metal?

• Sodium

• Aluminium

• Nitrogen