The universe<span> today is observed to contain one helium atom for every ten or eleven atoms of </span><span>hydrogen</span>
H20 and c20 were brothers and sisters before ch3ch2nh2 even existed
Answer:
A. Because they are compounds, they cannot be pure substances.
Explanation:
The false statement from the given choices is that because they are compounds they cannot be pure substances. In fact, because they are compounds they are pure substances.
Pure substances are made up of elements and compounds and they have the following properties:
- All parts are the same throughout
- Composition is definite
- They cannot easily be separated or broken
- Separation by physical method is not easy
- They have unique sets of physical and chemical properties.
CO2(s) is a solid.
CO2(g) means it is gas.
So they differ in their physical properties.
Physical propertiers means that they differ in their look.
Answer:
C. the uneven heating of Earth's surface
