Answer:
False
Explanation:
Water melting from ice into a liquid is not a chemical reaction or chemical change. It is merely a phase change from solid to liquid.
Answer:
3.4moles
Explanation:
Given parameters:
Number of molecules = 2.04 x 10²⁴
Unknown: Number of moles
Solution
We use the concept of mole to solve this kind of problem.
A mole is the amount of substance that contains Avogadro's number of particle i.e 6.02 x 10²³ molecules
Solving
For elementary particles:
Number of moles =
¹ molecules
Number of moles = 
Number of moles of H₂O = 0.34 x 10¹ = 3.4moles
Answer:
..........................
Explanation:
........................
Answer: b
Explanation: alpha decay or particle consist of two protons and two neutrons hence it is a helium nucleus.