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3 years ago

Please answer this question only if you know the answer! 30 points and brainliest!

Chemistry

2 answers:

liq [111]3 years ago

5 0

A. i think it’s the correct answer

telo118 [61]3 years ago

5 0

A. The circuit has insufficient power supplied by the battery

Was their meant to be a diagram?

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Help on this question please

sertanlavr [38]

3rd option please and good luck hope you pass...........

7 0

3 years ago

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______________ yield about 4 kcal/g when completely oxidized, whereas ___________ yield about 9 kcal/g.

Aleks [24]

Proteins and carbohydrates <span>yield about 4 kcal/g when completely oxidized, whereas fats yield about 9 kcal/g.</span>

3 0

3 years ago

Draw the Lewis structure for H2SO4 (H is bonded to O). Draw the molecule by placing atoms on the grid and connecting them with b

Pavel [41]

Answer:

Lewis structure in the attached image.

Explanation:

To draw the Lewis structure of H₂SO₄, we need to consider the octet rule: atoms gain, lose or share electrons to have 8 electrons in their valence shell. Hydrogen is an exception because its valence shell is complete with 2 electrons (duet). H, S and O are nonmetals, so they form covalent bonds to complete their valence shell, that is, they share pairs of electrons.

S has 6 valence electrons, so it has to share 2 pairs of electrons to reach the octet.

O has 6 valence electrons, so it has to share 2 pairs of electrons to reach the octet.

H has 1 valence electron, so it has to share 1 pair of electrons to reach the duet.

In the attached image is the resulting Lewis structure.

3 0

3 years ago

PLEASE HELP this is chemistry 12 points

Inessa05 [86]

Answer:

6.791

Explanation:

For proper significant figures with addition, you would use the significant figures of the number with lowest decimal place. 6.298 goes to the 10⁻³ place. 0.492712 goes to the 10⁻⁶ place. You will go out to the 10⁻³ place.

6.298 + 0.492712 = 6.790712 ≈ 6.791

8 0

3 years ago

Which solute would be more effective at lowering the freezing point of water: MgCl2 and KNO3? Explain.

Phantasy [73]

Answer:

AlCl₃.

Explanation:

Adding solute to water causes depression of the boiling point.

The depression in freezing point (ΔTf) can be calculated using the relation:

ΔTf = i.Kf.m,

where, ΔTf is the depression in freezing point.

i is the van 't Hoff factor.

van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass. For most non-electrolytes dissolved in water, the van 't Hoff factor is essentially 1.

Kf is the molal depression constant of water.

m is the molality of the solution (m = 1.0 m, for all solutions).

(1) NaCl:

i for NaCl = no. of particles produced when the substance is dissolved/no. of original particle = 2/1 = 2.

∴ ΔTb for (NaCl) = i.Kb.m = (2)(Kf)(1.0 m) = 2(Kf).

(2) MgCl₂:

i for MgCl₂ = no. of particles produced when the substance is dissolved/no. of original particle = 3/1 = 3.

∴ ΔTb for (MgCl₂) = i.Kb.m = (3)(Kf)(1.0 m) = 3(Kf).

(3) NaCl:

i for KBr = no. of particles produced when the substance is dissolved/no. of original particle = 2/1 = 2.

∴ ΔTb for (KBr) = i.Kb.m = (2)(Kf)(1.0 m) = 2(Kf).

(4) AlCl₃:

i for AlCl₃ = no. of particles produced when the substance is dissolved/no. of original particle = 4/1 = 4.

∴ ΔTb for (CoCl₃) = i.Kb.m = (4)(Kf)(1.0 m) = 4(Kf).

So, the ionic compound will lower the freezing point the most is: AlCl₃

4 0

3 years ago

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