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ruslelena [56]
3 years ago
15

The table compares some characteristics of two atoms.

Chemistry
1 answer:
Mademuasel [1]3 years ago
4 0

Answer:

Explanation:

Atom X,

Neutron num = 4, Mass num = 7

Therefore, proton number = Mass num - Neutron num

                                           = 7 - 4

                                           = 3

Atom Y,

Neutron num = 5, Mass num = 9

Therefore, proton number = Mass num - Neutron num

                                           = 9 - 5

                                           = 4

1) False. Atom X belongs to group 3 while atom Y belongs to group 4

2) False. Atom X is in a column on the left of Atom Y

3) True. Atom X and atom Y belong to the same period two on the periodic table

4) Fasle. Atom X and Y are not isotopes because they do not have the same atomic number.

Isotopy is a phenomenon whereby atom of same element have same atomic number but different mass number

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lyudmila [28]

Answer: 494.872mins

Explanation:

M= MrIt÷n

M=20g

Mr=65g/mol

I=2A

1 farad= 96500

For zinc with 2ions

2×96500= 193000

M×n= MrIt

T= M×n÷MrI

t= 20×193000/2×65

t= 3860000/130

t= 29692.307sec

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t= 494.872 mins

7 0
3 years ago
NEED ANSWER FAST!
lorasvet [3.4K]

Answer:

B

Explanation:

Molarity = 0.010M

Volume = 2.5L

Applying mole-concept,

0.010mole = 1L

X mole = 2.5L

X = (0.010 × 2.5) / 1

X = 0.025moles

0.025moles is present in 2.5L of NaOH solution.

Molar mass of NaOH = (23 + 16 + 1) = 40g/mol

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Which option describes the direction of thermal energy transfer in earth's oceans?
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What was the chemical purpose of heating the MnSO4⋅H2O? Why is this procedure important?
Alla [95]

The chemical purpose of heating the MnSO4⋅H2O is to eliminate water with the formation of new compounds.

<h3>Dehydration reactions</h3>

Dehydration reaction is a type of chemical reaction that involves the removal of water which would eventually lead to the formation of a new compound.

The molecule of MnSO4⋅H2O contains a molecule of water(H2O). After heating of the molecule, water is lost giving rise to the dry compound MnSO4.

Other examples of dehydration reactions are:

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  • Reactions that involve the production of polymers.

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Therefore, the chemical purpose of heating the MnSO4⋅H2O is to eliminate water with the formation of new compounds.

Learn more about dehydration here:

brainly.com/question/12261974

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