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liq [111]
2 years ago
14

100 POINTS!!! ANSWER ASAP

Chemistry
2 answers:
andreyandreev [35.5K]2 years ago
7 0

Answer:

1eV

Explanation:

diamong [38]2 years ago
3 0

Answer:

1ev

Explanation:

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Balance the following half-reaction: (acidic) NO−3(aq) → NO2(aq) Express your answer as a half-reaction. Identify all of the pha
Marrrta [24]

Answer:

2H⁺  + NO₃⁻  + 1e⁻ →  NO₂  + H₂O

Explanation:

NO₃⁻  →  NO₂

In left side, Nitrogen acts with +5 by oxidation number

In right side, the oxidation number is +4

This is a reduction reaction, because the oxidation number has decreased. So the N has gained electrons.

NO₃⁻  + 1e⁻ →  NO₂

In acidic medium, we have to add water, where there are less oxygens to ballance the amount. We have 2 O in left side, and 3 O in right side, so we have to add 1 H₂O on left side.

NO₃⁻  + 1e⁻ →  NO₂  + H₂O

Now that oxygens are ballanced, we have to ballance the hydrogens by adding protons in the opposite side

2H⁺  + NO₃⁻  + 1e⁻ →  NO₂  + H₂O

8 0
3 years ago
Which of the following lists of elements are in the same PERIOD? *
yuradex [85]
Ca, V, Cu, Kr
Remember a period is a the horizontal rows in the Periodic Table.

5 0
3 years ago
7) Explain how tsunamis are formed. How do tsunamis change the surface of the Earth?
Virty [35]
Well, for starters:

Tsunamis are formed by tectonic plates smashing into one another. 
They are caused by earthquakes, landslides, volcanic eruptions, and even under sea earth quakes.

Hope this helps!
5 0
3 years ago
A sodium flame has a characteristic yellow color due to emissions of wavelength 589 nm. What is the mass equivalence of one phot
Sladkaya [172]
I really don’t know but I’ll tell you soon
8 0
3 years ago
At what temperature would a 1.30 m NaCl solution freeze, given that the van't Hoff factor for NaCl is 1.9? Kf for water is 1.86
Setler [38]

Answer:

-4.59°C

Explanation:

Let's see the formula for freezing point depression.

ΔT = Kf . m . i

ΔT = Freezing T° of pure solvent - Freezing T° of solution

Kf = Freezing constant. For water if 1.86°C/m

m = molality (moles of solute in 1kg of solvent)

i = Van't Hoff factor.

0°C - Freezing T° of solution = 1.86°C /m . 1.30m . 1.9

Freezing T° of solution = - (1.86°C /m . 1.30m . 1.9)

Freezing T° of solution = - (1.86°C/m .  1.30m . 1.9) → -4.59°C

NaCl →  Na⁺  +  Cl⁻

4 0
3 years ago
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