Answer:
:)
Explanation:
If we subtract the atomic number from the atomic mass: atomic mass - atomic number = number of protons + number of neutrons - number of protons. Thus we get the number of neutrons present in an atom when we subtract the atomic number from the atomic mass.
Answer:
B) Heat is given off.
Explanation:
When heat is given off, a chemical change must have occurred and such a reaction is termed an exothermic reaction.
A chemical change is one in which;
- the process is not easily reversible
- leads to the production of new kinds of matter
- involves change in mass
- requires a considerable amount of energy.
Most chemical reactions are accompanied by heat changes.
Answer:
c
Explanation:
when the weight of the object is greater than the buoyant force sinking is occurred.
The empirical formula of the compound is the formula with the simplest ratio of the elements involved. The molecular formula is the formula that is the empirical formula multiplied by an integer. In this case, the molar mass of C2H3 is equal to 27 g/mol. 54.10/27 is approx. 2, so the molecular formula should be C4H6
