Balancing chemical equations i need ! : ) balance the equation for the reaction between zinc and hydrochloric acid. zn + hci → znci₂ + h₂ balance the equation for the reaction between iron and oxygen. fe + 0₂ → fe₂o₃ balance the equation for the reaction of hydrogen peroxide in the presence of catalase. h₂o₂ → h₂o + o₂

Number 1: answer is Zn + 2HCl > ZnCl2 + H2
This one was a bit simple
we have:
zn- 1            zn-1
H-1              H-2
Cl-1             Cl-2
After this you can see that both H and Cl need to be multiplied by 2 on the reactants side. By putting 2HCl, you have accomplished this goal
Number 2: 4Fe + 3O2 > 2Fe2O3
We have:
Fe- 1         Fe-2
O-2            O-3
So unlucky for us, none of these were already balanced. I started first with Fe and started plugging in numbers. So if i were to put a 2 in front of Fe, it would cause 2-Fe and then 2-Fe on the other side, making it balanced. 
The problem is that the O values still need to be balanced. If you notice, both Os have a 3 or a 2. 3 x 2= 6. SO you would need to add the opposite number on each. (3O2). 
Number 3: 2H2O2 > 2H2O + O2
The answer is balanced as it has 
H- 4              H-4
O-4               O-4
To figure this out, you would have to first look at what you need
The H values already look balanced, so we will look at O
There are 2 on the reactant side and 3 on the product
Start by adding a 2 onto H2O2        (2H2O2)
We now have 4 H  and 4 O values on that side, but we still need to change the products side
By adding a 2 to H2O, You would then have the number of required values.

There are no metaphors.

The main types of electromagnetic radiation. radio  waves have  the lowest frequencies  and  longest  wavelengths, while gamma  waves have highest frequencies  and shortest wavelengths. the wavelengths vary across the electromagnetic spectrum from about 10–15 m to more than 104 m.hope it !