Answer: C
This is an example of sound wave reflection, also known as "echoing".
Answer:
1. In electron dot structure, the dot represent one electrons.
2. Ionic compounds are highly soluble in water.
3. The bond formed by the mutual sharing of two electrons is called covalent bond.
4. there are 3 bonds in nitrogen molecule.
5. the ionic bonds are non-directional.
6. NaCl is taken in molten state
7. formula of common salt is NaCl.
8. Oxygen gas is a diamotic molecule.
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Answer:
it's A endothermic its when two objects rub each other to form heat this is also known as friction force
