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Alex777 [14]
3 years ago
6

Select the reagent that will separate the pairs of ions listed.

Chemistry
1 answer:
daser333 [38]3 years ago
8 0

1 - a, 2-b, 3-d, 4 - e

<u>Explanation:</u>

<u></u>A g^{+} \text {and } A l^{3+} - Separated by 6M HCl

Silver and aluminum ions can be separated using the acid, 6M HCl.

C u^{2+} \text { and } C a^{2+}- Separated by H₂S

Copper and Calcium ions can be separated by the reagent hydrogen sulfide, H₂S.

M g^{2+} \text { and } K^{+} - Separated by (NH₄)₂HPO₄ in NH₃

Magnesium and Potassium ions can be separated by the reagent Ammonium hydrogen phosphate in ammonia.

N i^{2+} \text { and } C o^{2+}- cannot be separated

Nickel and Cobalt ion cannot be separated by the reagents given at all.

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Give the oxidation number of the element indicated for each compound.
NARA [144]

Answer:

a. C: +3 ; b. N: +5 ; c. S:+6 ; d. C: +4; e. Mn: +7 ; f. Cr: +6.

Explanation:

Global charges in molecules is 0

You sum all the oxidation states to determine the oxidation state for the compound.

Na₂C₂O₄ → Sodium oxalate → Global charge: 0

Oxidation state for C: +3

HNO₃ → Nitric acid → Global charge: 0

Oxidation state for N: +5

H₂SO₄ → Sulfuric acid → Global charge: 0

Oxidation state for S: +6

HCO₃⁻  →  Bicarbonate → Global charge: -1, this is an anion

Oxidation state for C: +4

KMnO₄ → Potassium permanganate → Global charge: 0

Oxidation state for Mn: +7

Cr₂O₇⁻ → Anion dichromate → Global charge: -2

Oxidation state for Cr: +6

8 0
3 years ago
How much thermal energy is in 100 grams of water at 50 degrees Celsius
Ymorist [56]
when the thermal energy is the energy contained within a system that is responsible for its temperature.  

and when the thermal energy  is can be determined by this formula:

q = M * C *ΔT

when q  is the thermal energy

and M is the mass of water = 100 g 

and C is the specific heat capacity of water = 4.18 joules/gram.°C

and T is the difference in Temperature = 50 °C

So by substitution:

∴ q = 100 g * 4.18 J/g.°C * 50

   = 20900 J  = 20.9 KJ
6 0
3 years ago
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Circle the correct one from given alternatives.
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Answer:

24 is the correct anwer

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2 years ago
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Answer:idk

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8 0
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19. When an atom of iron loses all of its 4s electrons and one of its 3d electrons, what is its charge?
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Its charge would be the amount of electrons that are lost in total, which the information is not stated

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