Question

Assess yourself..
A. Tick the correct option.
1. Which of the following is an element?
a) Sand
b) Water
c) Oxygen
d) Sea water
2. Which of the following is a compound?
a) Hydrogen
b) Water
c) Sodium
d) Magnesium​

Answer 1

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1)

D) Sea water

2)

C) Sodium

Answer 2

Explanation:

answer of 1: oxygen (o2)

answer of 2: water (h2o)