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3 years ago

When water unfreezes what happens to the volume of the sample

Chemistry

1 answer:

hram777 [196]3 years ago

8 0

<u>Answer:</u>

It eventually decreases.

<u>Explanation:</u>

Frozen water is known to have more volume, but less density. When water slowly gets unfrozen, it'd volume decreases and its density increases. Hence, when the water gets unfrozen, it's volume decreases.

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Provided is a diagram showing forces on a box.

Eduardwww [97]

Answer:

5 N left

Explanation:

trust me cccuuhh

4 0

3 years ago

How many moles of ions are released when 0.27 mole of cobalt chloride is dissolved in water?

egoroff_w [7]

0.81 moles

Explanation:

cobalt chloride when dissolved in water dissociate into cobalt and chloride ions as shown;

CoCl₂ (s) → [Co²⁺](aq) + 2[Cl⁻] (aq)

The mole ratio between CoCl₂ and [Co²⁺] is 1 ; 1 while the mole ratio between CoCl₂ and [Cl⁻] is 1 : 2

Therefore; 0.27 moles of CoCl₂ will form;

(1 * 0.27) = 0.27 moles of [Co²⁺] ions

(2 * 0.27) = 0.54 moles of [Cl⁻] ions

Total moles of dissociated ions are;

0.27 + 0.54

= 0.81 moles

4 0

3 years ago

Causes light rays passing through it to meet at a focal point A. Convex lens B. Concave lens or C. Both?

anyanavicka [17]

Answer:

A. Convex lens.

Explanation:

A convex lens causes light rays to meet at a focal point unlike concave, which lights rays spread out.

6 0

3 years ago

Provide the IUPAC name for the following compound: a. 2,4,5-Trimethyl-4-propylheptane b. 4-Isobutyl-4,5-dimethylheptane c. 4-sec

mel-nik [20]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The correct option is A

That is 2,4,5-Trimethyl-4-propylheptane

Explanation:

Looking at the structure the longest carbon chain is 7 as shown on the second uploaded image

Also from the diagram of the structure we can identify that is longest chain has 3 methyl group attachment and one propyl group attachment

Now going through this longest chain the numbering of this attachment them the lowest number is the correct way so as we can see

2,4,5-Trimethyl-4-propylheptane gives the lowest numbering compared to 3,4,6-Trimethyl-4-propylheptane so the correct IUPAC names is 2,4,5-Trimethyl-4-propylheptane

8 0

4 years ago

Given the following balanced chemical reaction:

Gnom [1K]

Answer:

Explanation:

according to balance chemical equation

3 A2 moles produced 2 moles of A3B

so 12 moles A2 will produced moles of A3B= 12*2/3=24/3= 8

therefore 12 moles of A2 produced 8 moles of A3B

6 0

4 years ago