1. Which of the following appears to cause the temperature of the atmosphere to rise?

Chemistry

1 answer:

Mila [183]2 years ago

7 0

Answer:

increasing level of carbon dioxide

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The chemical equation, Cr + Fe(NO3)2 → Fe + Cr(NO3)3, is an example of which type of reaction?

Angelina_Jolie [31]

Answer:

Redox type

Explanation:

The reaction is:

2Cr + 3Fe(NO₃)₂ → 2Fe + 2Cr(NO₃)₃

2 moles of chromium can react to 3 moles of iron (II) nitrate in order to produce 2 moles of iron and 2 moles of chromium nitrate.

If we see oxidation state, we see that chromium changes from 0 to +3

Iron changed the oxidation state from +2 to 0

Remember that elements at ground state has 0, as oxidation state.

Iron is being reduced while chromium is oxidized. Then, the half reactions are:

Fe²⁺ + 2e⁻ ⇄ Fe (Reduction)

Cr ⇄ Cr³⁺ + 3e⁻ (Oxidation)

When an element is being reduced, while another is being oxidized, we are in prescence of a redox reaction.

8 0

3 years ago

How does the structure of this umbrella relate to its function?

azamat

Please be specific. Which umbrella?

4 0

2 years ago

Why should you be careful when you heat your NaCl solution to evaporate the water?

ivolga24 [154]

Answer & Explanation:

If we heat the NaCl solution strongly, it boils and moves vigorously causing some of the solution to get out of the container.

This will cause loss of NaCl in the amount that get out of the container.

So, this affect the yield of the obtained NaCl after water evaporation.

7 0

3 years ago

For the reaction N2O4(g) ⇋ 2NO2(g), Kc = 0.25 at 98°C. At a point during the reaction, the concentration of N2O4 = 0.50 M and th

Scilla [17]

Answer:

Q = 0.50

Left

Explanation:

At a generic reversible equation

aA + bB ⇄ cC + dD

The reaction coefficient (Q) is the ratio of the substances concentrations:

$Q = \frac{[C]^c*[D]^d}{[A]^a*[B]^b}$

Solids and liquid water are not considered in this calculus.

When the reaction achieves equilibrium (concentrations are constant), the Q value is named as Kc, which is the equilibrium constant of the reaction. If Q > Kc, it indicates that the concentration of the products is higher, so, the reaction must progress to the left and form more reactants; if Q < Kc, than the concentrations of the reactants, are higher, so, the reaction progress to the right.

In this case:

Q = $\frac{[NO_2]^2}{[N_2O_4]}$