Chemistry, 24.07.2019 12:20, infoneetusinghoyg22o

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

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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.

answered: Guest

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

answered: Guest

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

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