The answer is "A. a pure substance can be separated by chemical means, while a mixture can be separated by physical means". A pure substance only has one type of substance, whereas a mixture has more than one. A pure substance therefore, can only be separated chemically, because it is not two things mixed together, whereas a mixture can be separated physically because there are multiple substances.
Answer:
thermal energy is heat energy it is used for man kitchen appliances and also in nature from the sun for photosynthesys
Explanation:
The Correct choices are :
- 1. The elements have filled valence levels.
- 2. potassium (K) with a 1+ charge
Answer:
D. The other planet has munch less mass than the earth so it exerts much less gravitational force
