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myrzilka [38]
3 years ago
7

HELP ILL MARK U AS BRAINLIEST PLSSSSS!!

Chemistry
2 answers:
Molodets [167]3 years ago
6 0

The Earth moves faster than the planets that are farther from the Sun.

Norma-Jean [14]3 years ago
5 0
B. The earth correct answer.
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what will happen to water in a cup if the cup is placed inside a sealed bag and left in a warm area ?
Morgarella [4.7K]
The water will stay there nothing happens to the water in the bag.
4 0
4 years ago
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Jack is recording the growth of a single tree over the course of a year. What type of graph should he use to display the data?
Dmitry [639]

The answer should be the last one Line graph. I hope I helped!

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Given the following electronic configurations, identify how many valence electrons each atom has.
Varvara68 [4.7K]

Answer:

sodium=atomic number 11 it electronic configuration is ,K=2, L=8,M=1 Valence is 1

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7 0
3 years ago
Erbium metal (Er) can be prepared by reacting erbium(III) fluoride with magnesium; the other product is magnesium fluoride. Writ
Nesterboy [21]

Answer:

2ErF3 +3Mg = 3MgF2 + 2Er

Explanation:

This is a single replacement equation where there are 2 metals. The bonds are broken and new bonds are formed again by Mg and F.

Er has a +3 charge and F has a -1 charge. You switch it around and you get ErF3. Then you add the second reactant, Mg. The product is MgF as stated, and Mg has a charge of +2 and F has -1. You switch it again and you get MgF2. Then the second product Er is there.

Now we have

ErF3+Mg=MgF2+Er

So we balance the equation because of the law of conservation of mass.

Make F equal, so we add the coefficents 2 and 3

2ErF3+Mg=3MgF2+Er

And now Mg and Er need balancing so

2ErF3+3Mg=3MgF2+2Er

Hope this helped

8 0
4 years ago
In terms of the atmosphere, which of the following best describes the oxygen that is present?
Viktor [21]
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6 0
3 years ago
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