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MissTica
3 years ago
14

The moon rises and sets every day, like the sun. Sarah noticed that the moon was sometimes visible at night and sometimes during

the day. She noted when she FIRST saw the moon (moon-rise) on two days in April. She looked up the time in the newspaper for moon-set. Both were different. Why? A) The moon is orbiting the Earth once per month. B) The night sky is moving east to west over Earth. C) The Earth is moving in an opposite direction from the moon. D) The apparent change in position is related to the Sun's reflection.
Chemistry
1 answer:
eimsori [14]3 years ago
3 0

the answer is A.) the moon is orbiting the earth once per month

its the only logical answer, the others are either impossible or illogical

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olga_2 [115]
<span>Answer: Pb(NO3)2+2HCl=PbCl2+2HNO3 Step 2 Find # of moles of Pb 13.87g Pb(NO3)2 x 1 mol/331.22=.041875 mol Pb(NO3)2 Step 3 Use balanced equation to find weight of Pb(NO3)2 .041875mol Pb x 1 mol Cl2/1mol Pb x 70.90g/1 mol Cl2=2.9689g Cl2 .041875 mol Pb x 207.2/1mol Pb=8.6765g Pb =11.65g</span>
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3 years ago
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How is a new moon the same as or different from a total lunar eclipse
yarga [219]

Explanation:

Both new moon and lunar eclipse occur when the moon is in the same plane the sun and the earth. However, both are different because of the relative position of the moon in its orbit – relative to earth. In a new moon, the moon is in between the earth and the sun, while in a lunar eclipse, the earth us in between the moon and the sun.

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8 0
3 years ago
Calculate Delta n (change in moles of gaseous substances) for each of the following balanced chemical equations...
Lerok [7]
<span>2<span>C6</span><span>H6</span>O(l)+17<span>O2</span>−−>12C<span>O2</span>(g)+12<span>H2</span>O(l)</span>
<span>2S<span>O2</span>(g)+<span>O2</span>(g)−−>2S<span>O3</span>(g)</span>
<span><span>N2</span>(g)+<span>O2</span>(g)−−>2NO(g)</span>
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On the 1st 3 I have
12 -17 = -5
2 - 3 = -1
2 - 2 = 0
For the last one:
</span><span>Delta n=0</span><span>
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3 0
3 years ago
Using the van der waals equation, the pressure in a 22.4 l vessel containing 1.50 mol of chlorine gas at 0.00 °c is ________ atm
Lana71 [14]

Answer is: the pressure in a vessel is 1.48 atm.

V(Cl₂) = 22.4 L; pressure of chlorine gas.

n(Cl₂) = 1.50 mol; amount of chlorine gas.

T = 0.00°C = 273.15 K; temperature.

a = 6.49 L²·atm/mol²; the constant a provides a correction for the intermolecular forces.

b = 0.0562 L/mol; value is the volume of one mole of the chlorine gas.

R = 0.08206 L·atm/mol·K, universal gas constant.

Van de Waals equation: (P + an² / V²)(V - nb) = nRT.

(P +  6.49 L²·atm/mol² · (1.5 mol)² / (22.4 L)²) · (22.4 L - 1.5 mol·0.0562 L/mol) = 1.5 mol · 0.08206 L·atm/mol·K · 273.15 K.

(P +  6.49 L²·atm/mol² · (1.5 mol)² / (22.4 L)²) = (1.5 mol · 0.08206 L·atm/mol·K · 273.15 K) ÷ (22.4 L - 1.5 mol · 0.0562 L/mol).

P + 0.029 atm = 33.62 L·atm ÷ 22.31 L.

P = 1.507 atm - 0.029 atm.

P = 1.48 atm; the pressure.

7 0
3 years ago
Which of the following is included in nuclide symbols, but is not strictly necessary for the identification of the nuclide?
kodGreya [7K]

Answer:

c. isotope number

Explanation:

Mass Number is the sum total of mass of protons and neutrons present in the nucleus of an atom.  Generally they are being used in distinguishing isotopes. E.g Carbon - 12, Carbon - 13

Atomic Number is the number of protons. Every single element has it's unique atomic number and can be used in identification purpose. E.g Carbon - 6, Hydrogen - 1.

The correct option is option C. This is the symbol that is not necessary for the identification of a nuclide.

5 0
3 years ago
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