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arsen [322]
3 years ago
6

What is the balanced chemical equation for the word equation below?

Chemistry
1 answer:
ladessa [460]3 years ago
6 0

Answer:

4Fe + 3O₂ → 2Fe₂O₃

Explanation:

Fe → ²⁺

O → ²⁻

But Iron III is Fe³⁺

So we have Fe³⁺ and O²⁻, the formula for the oxide must be Fe₂O₃ so the equation can be:

4Fe + 3O₂ → 2Fe₂O₃

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Why is the atom neutrally charged?
V125BC [204]
Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged).
3 0
3 years ago
An electron in a hydrogen atom drops from energy level e3 to e2. what's the frequency of the emitted photon
castortr0y [4]
For this problem we can use 2 equations.
(1) - E = mC²
          E = Energy of photon (J)
          m = Mass of photon (kg) (1.67x10⁻²⁷ kg)
          C = speed of light (3 x 10⁸ m/s)

(2) - E = hf
        E = Energy of photon (J)
        h = plank's constant (6.63 × 10⁻³⁴<span>J s)
        f  = frequency of the photon (Hz)

(1) = (2)
hence, </span>mC² = fh                
                
by rearranging, 
                f =  mC² / h 
                f  =  1.67x10⁻²⁷ kg * (3 x 10⁸ m/s)² / (6.63 × 10⁻³⁴J s)
              f    = 2.27 x 10²³ Hz            
3 0
3 years ago
Oxygen gas is collected at a pressure of 1.21 atm in a container which has a volume of 10.0 L. What temperature (in Kelvin) must
stiv31 [10]

Answer : The temperature of gas is, 295 K

Explanation :

To calculate the temperature of gas we are using ideal gas equation:

PV=nRT

where,

P = Pressure of gas = 1.21 atm

V = Volume of gas = 10.0 L

n = number of moles = 0.500 mole

R = Gas constant = 0.0821L.atm/mol.K

T = Temperature of gas = ?

Now put all the given values in above equation, we get:

1.21atm\times 10.0L=0.500mole\times (0.0821L.atm/mol.K)\times T

T=294.8Kapprox 295K

Therefore, the temperature of gas is, 295 K

5 0
3 years ago
What is the pound mole of co2 ​
andrezito [222]
44.01 I’m pretty sure
7 0
3 years ago
The Ksp of CaF2 is 4.0 x 10-11. What is the solubility of CaF2 in 0.10 M Ca(NO3)2? Give your answer using scientific notation an
Ilya [14]

Answer:

1.0\times 10^{-5} M is the solubility of CaF_2 in 0.10 M Ca(NO_3)_2.

Explanation:

Concentration of calcium nitrate = [Ca(NO_3)_2]=0.10 M

Ca(NO_3)_2\rightarrow Ca^{2+}+2NO_3^{-}

[Ca(NO_3)_2]=0.10 M=[Ca^{2+}]

Solubility product of the calcium fluoride = K_{sp}=4.0\times 10^{-11}

Solubility of calcium fluoride in calcium nitrate solution :

CaF_2\rightleftharpoons Ca^{2+}+2F^-

            (0.10+S)   (2S)

The expression of solubility is given by :

K_{sp}=[Ca^{2+}][F^-]^2

4.0\times 10^{-11}=(S+0.10)(2S)^2

Solving for S:

S=1.0\times 10^{-5} M

1.0\times 10^{-5} M is the solubility of CaF_2 in 0.10 M Ca(NO_3)_2.

3 0
3 years ago
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