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vladimir1956 [14]
3 years ago
12

Which alignment of the Sun, Moon, and Earth causes a lunar eclipse?

Chemistry
2 answers:
hram777 [196]3 years ago
8 0

Answer:

A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). This can occur only when the Sun, Earth, and Moon are aligned exactly with the Earth in the middle. Hence, a lunar eclipse can only occur the full moon phase

Explanation:

please mark me brainlist

irina [24]3 years ago
5 0

Answer:

A sun

Explanation:

because sun has heat and gives light

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The masses of carbon and hydrogen in samples of four pure hydrocarbons are given above. The hydrocarbon in which sample has the
enot [183]

Answer:

Sample B

Explanation:

In this case, we need to determine the empirical formula for each sample. The one that match the formula of the propene would be the sample.

Let's do Sample A:

C: 60 g;       H: 12 g

1. Calculate moles:

We need the atomic weights of carbon (12 g/mol) and hydrogen (1 g/mol):

C: 60 / 12 = 5

H: 12 / 1 = 12

2. Determine number of atoms in the formula

In this case, we just divide the lowest moles obtained in the previous part, by all the moles:

C: 5 / 5 = 1

H: 12 / 5 = 2.4    or rounded to two

3. Write the empirical formula:

Now, the prior results, represent the number of atoms in the empirical formula for each element, so, we put them with the symbol and the atoms as subscripted:

C₁H₂ = CH₂

Therefore, sample A is not the same as propene.

Sample B:

C: 72 g    H: 12 g

Following the same steps, let's determine the empirical formula for this sample

C: 72 / 12 = 6 ---> 6 / 6 = 1

H: 12 / 1 = 12 ----> 12 / 6 = 2

EF: CH₂

Sample C:

C: 84 g    H: 10 g

C: 84 / 12 = 7 ----> 7 / 7 = 1

H: 10 / 1 = 10    ----> 10 / 7 = 1.4 or just 1

EF: CH

Sample D

C: 90 g      H: 10 g

C: 90 / 12 = 7.5     -----> 7.5 / 7.5 = 1

H: 10 / 1 = 10  -------> 10 / 7.5 = 1.33 or just 1

EF: CH

Neither compound has the same empirical formula as C3H6, but C3H6 is a molecular formula, so, if we just simplify the formula we have:

C3H6  -----> CH₂

Therefore, sample B is the one that match completely. Sample B would be the one.

Hope this helps

8 0
3 years ago
PLEASE HELP BRAINLIEST 4 BEST ANSWER
Nimfa-mama [501]

Answer:

which site

Explanation:

5 0
3 years ago
Read 2 more answers
Round off or add zeros to the following calculated answers to give a final answer with three significant figures
sesenic [268]
In this case, 58.703 has five significant figures because the 3 at the end is significant and therefore makes the 0 significant as well. Since there are 5 significant figures, we need to round off the 7 to get 58.7, which has three significant figures.

Hope this helps.
8 0
3 years ago
Which of these outcomes is conclusive evidence that mixing sugar in water is a physical change?
Alika [10]
Well this can actually be A and C but I would go with C

(Reasoning) Well no change in color means that it is physical not chemical
and no gas also means physical not chemical
3 0
2 years ago
Predict whether these reactions will occur: <br>KBr+F2 ?<br>and<br>Bi+O2 ?
Drupady [299]
KBr + Fs won't make a reaction because KBr is stable with an octet.

Bi+O2 probably won't occur because the O2 has a stable octet as well/
7 0
3 years ago
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