4. 2
(b) on micro scale
on commercial scale
(d) on economic scale
Which one of the following compounds can be separated by physical means?
(a) mixture (b) element
(c) compound (d) radical
The most abundant element occurring
5.
6.
3.
7.

According to the tide table below what time of day will the highest tide occur?

What causes different colors to appear in the sky? the absorption of light by air molecules the reflection of light by bodies of water the greenhouse effect in earth's atmosphere the scattering and reflection of light by dust particles

What are the two major rules associated with polarity