Answer:
The formula for water is . The oxidation number of hydrogen is +1. Since there are two of them, the hydrogen atoms contribute to a charge of +2. The water molecule is neutral; therefore, the oxygen must have an oxidation number of to balance the charge.
Answer:
b) coefficient
Explanation:
Refer to this example:
CH4 +2 O2 → CO2+ 2 H2O
2 is used as a coefficient in this chemical equation.
Answer:
Explanation:
Velocity is a physical quantity that expresses the relationship between the space traveled by an object, the time taken for it and its direction. In other words, velocity is associated with the change of position of a body over time.
Its unit in the International System of Units is the meter per second (
), but it can also be expressed in 
So, in this case, the speed on the way to work will be:

velocity= 36 
The velocity on the way back home will be:

velocity= 27 
Answer:
because they emit liquid waste wich is later dumped into the ocean causing a lot of harm and many fatalities in sea life
Explanation:
The molecular formula of hydrate : CaCl₂.6 H₂O
So there are 6 molecules of H₂O
<h3>Further explanation</h3>
Given
54.7g CaCl₂ and 53.64 g H₂O
Required
The number of molecules H₂O
Solution
mol CaCl₂ :
= mass : MW
= 54.7 : 111 g/mol
= 0.493
mol H₂O :
= 53.64 : 18 g/mol
= 2.98
mol ratio H₂O : CaCl₂ :
= 2.98/0.493 : 0.493/0.493
= 6 : 1