3 years ago

To double-check a chemical in lab before using it, sniff near the opening of the container, true or false?

Chemistry

1 answer:

Bezzdna [24]3 years ago

5 0

The answers is false because you do not want to inhale unknown chemicals

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One application of Hess's Law (which works for ΔH, ΔS, and ΔG) is calculating the overall energy of a reaction using standard en

VikaD [51]

Answer:

The standard change in free energy for the reaction = - 437.5 kj/mole

Explanation:

The standard change in free energy for the reaction:

4 KClO₃ (s) → 3 KClO₄(s) + KCl(s)

Given that ΔGf(KClO3(s)) = -290.9 kJ/mol;

ΔGf(KClO4(s)) = -300.4 kJ/mol;

ΔGf(KCl(s)) = -409 kJ/mol

According to Hess's law

ΔGr (Free energy change of reaction)= ∑(Product free energy - reactant free energy)

⇒ ΔGr⁰ = {3 x (-300.4) + (-409)} - {3 x (- 290.9)}

= - 901.2 - 409 + 872.7

= - 437.5 kj/mole

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Chromosomes have genes, and genes are segments of DNA.

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sdas [7]

Answer: Ca^2+ and P^3-

Explanation:

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Chlorine reacts with sodium and with hydrogen.

Sonbull [250]

Answer:

Sodium Chloride has Ionic bond while Hydrogen Chloride has covalent bond.

Explanation:

Na has 11 electrons (2, 8, 1) and need to give away 1 electron to be stable

Cl has 17 electrons ( 2, 8, 7) and needs 1 electron to be stable.

Na transfers 1 electron to CL to form Ionic bond.

While

Hydrogen has 1 electron and shares with Chlorine to be stable.

Covalent bond involves sharing.

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Explanation:

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