Systems & System Models

Chemistry

1 answer:

musickatia [10]3 years ago

7 0

Answer:

ok idk what this says

Explanation:

cuz it's a lot of random words

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Which solution has the lowest freezing point?

Leokris [45]

Correct Answer: Option 3 i.e. 30 g of KI dissolved in 100 g of water.

Reason:
Depression in freezing point is a colligative property and it is directly proportional to molality of solution.

Molality of solution is mathematically expressed as,
Molality = $\frac{\text{Number of moles}}{\text{Weight of solvent (Kg)}}$ 

In case of option 1 and 2, molality of solution is 0.602 m. For option 3, molality of solution is 1.807 m, while in case of option 4, molality of solution is 1.205 m.

Thus, second solution (option 2) has highest concentration (in terms of molality). Hence, it will have lowest freezing point

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4 years ago

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Which statement accurately describes the habitability of the planets?

tekilochka [14]

Answer:

Explanation:

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3 years ago

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bre: 1073/2900 Resources A sample of metal has a mass of 24.02 g, and a volume of 5.02 mL. What is the density of this metal? g/

alina1380 [7]

Answer:

4.78 g/cm³

Explanation:

Density is expressed as mass per unit volume:

D = m/V

D = (24.02 g) / (5.02 mL) = 4.78 g/mL

The density should be expressed in g/cm³, so mL must be converted to cm³. The conversion ratio is 1 mL = 1 cm³.

(4.78 g/mL)(1 mL/1 cm³) = 4.78 g/cm³

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3 years ago

What happens when gases change to plasma?

IgorLugansk [536]

Answer:. In the case of neon, it is electrical energy that pulls the electrons off.

explanation-Plasma can be made from a gas if a lot of energy is pushed into the gas. In the case of neon, it is electrical energy that pulls the electrons off. When it is time to become a gas again, just flip the neon light switch off. Without the electricity to energize the atoms, the neon plasma returns to its gaseous state.

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3 years ago

What is the value of q when the solution contains 2.00×10−2 m sr2+ and 1.50×10−3m cro42−?

Law Incorporation [45]

Answer is: ion product for strontium chromate is 3·10⁻⁵.
Balanced chemical reaction (dissociation) of strontium chromate:
Sr²⁺(aq) + CrO₄²⁻(aq) → SrCrO₄.
Qsp(SrCrO₄) = c(Sr²⁺)·(CrO₄²⁻).
c(Sr²⁺) = 2.00·10⁻² M.
c(CrO₄²⁻) = 1.50·10⁻³ M.
Q = 2.00·10⁻² M · 1.50·10⁻³ M.
Q = 0.00003 = 3·10⁻⁵ M².

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3 years ago

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