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4 years ago

Hoon2. In words, describe how the changing positions of the sun, moon, and Earthleadthe different moon phases.

Chemistry

1 answer:

zysi [14]4 years ago

7 0

As the Sun sets, the moon rises with the tide that faces the Earth fully exposed to sunlight. The moon has phases because of its orbit to Earth which causes the portion we see illuminated to change. The new moon occurs when the moon is positioned between the earth and the sun. at full moon and third quarter or called as the half moon, it happens when the moon is at a 90 degree angle with respect to the earth and the sun. crescent refers to the moon that is less than half illuminated by the sun. gibbous refers to more than half illuminated by the sun. waxing means growing or expanding in illumination and waning means shrinking or decreasing in illumination.

You might be interested in

Which statement is correct? Group of answer choices none of these H2O is linear. The bonds in LiF have a more covalent character

Sergio [31]

Answer: The statement molecule $ClO_{2}$ cannot be accurately described by a Lewis structure consistent with the octet rule, is true.

Explanation:

As the chemical formula of water is $H_{2}O$ and since it contains electronegative oxygen atom which also has 2 lone pair of electrons. Hence, lone pair-bond pair repulsion occurs due to which water has a bent shape structure.

The compound LiF contains metal lithium and non-metal fluorine. In order to obtain stability lithium donates its valence electron to the fluorine atom leading to the formation of an ionic bond. Hence, LiF is an ionic compound and not a covalent compound.

Generally, ionic compounds are polar in nature. For example, KOH is a polar compound and $Cl_{2}$ is a non-polar compound.

Thus, we can conclude that the statement molecule $ClO_{2}$ cannot be accurately described by a Lewis structure consistent with the octet rule, is true.

7 0

3 years ago

Na+ + Cl– NaCl Which statement best describes the relationship between the substances in the equation?

ANTONII [103]

Answer : The number of sodium ions is equal to the number of formula units of salt.

Explanation : In the given reaction of NaCl the statement which describes it the best is that the number of sodium ions is found to be same along with the formula units in the product side.

$Na^{+}$ + $Cl^{-}$ ----> NaCl.

Its clear from the equation that one mole of Na and one mole of Cl combines together to give the product, which is one mole of NaCl. The number of ions on both the sides are equal.

3 0

3 years ago

Read 2 more answers

How many molecules in 11 grams of CO2?

yawa3891 [41]

Answer:

1095.62

Explanation:

5 0

3 years ago

Just as pH is the negative logarithm of [H3O+], pKa is the negative logarithm of Ka, pKa=−logKa The Henderson-Hasselbalch equati

Vika [28.1K]

Answer:

You need to add 109,2g of NH₄Cl.

Explanation:

To calculate the pH in a buffer you can use Henderson-Hasselbalch formula:

pH = pka + log₁₀ $\frac{[base]}{[acid]}$

1. ka of 1,8x10⁻⁵ ≡ 4,74

pH = 4,74 + log₁₀ $\frac{[1]}{[10]}$ = 3,74

pH = 4,74 + log₁₀ $\frac{[1]}{[1]}$ = 4,74

pH = 4,74 + log₁₀ $\frac{[10]}{[1]}$ = 5,74

2. Using:

pOH = pkb + log₁₀ $\frac{[acid]}{[base]}$

A pH of 8,89 is a pOH of 14-8,89 = 5,11

Thus:

5,11 = 4,74 + log₁₀ $\frac{[acid]}{[base]}$

2,32 = $\frac{[acid]}{[base]}$

The moles of ammonia (base) are:

2,20L × 0,400M = 0,88 moles

Replacing:

2,32 = $\frac{[acid]}{[0,88]}$

[acid] = 2,0416 moles of NH₄Cl ₓ (53,491g/mol) = 109,2 g of NH₄Cl

You need to add 109,2g of NH₄Cl.

I hope it helps!

6 0

3 years ago

What are subatomic particles?

Phantasy [73]

They are very small components that make up the physical matter in our universe by interacting with one another. some include Protons, Electrons, and Neutrons that constitute an atoms nucleus and orbital shells.

hope that helps

4 0

3 years ago