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Rzqust [24]
3 years ago
14

When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemicall

y. Which property of the unknown element determines the other elements it reacts with? *
1 point
A. The total number of neutrons in the unknown element
B. The total number of particles in the nucleus of the unknown element
C. The number of protons in the nucleus of the unknown element
D. The number of valence electrons in the unknown element
Chemistry
1 answer:
777dan777 [17]3 years ago
7 0
The answer is d


If wrong don’t delete just tell me
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When heating a solution to boiling on a hot plate, start by ___________. Then, turn the heat to ___________to start. If necessar
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Answer:

1. starting and stabilizing the stir function

2. a medium heat

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Explanation:

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Some of the laboratory apparatus (equipment) used for conducting a chemical reaction are conical flask, Bunsen burner, beaker, tongs, crucible, round bottom flask etc.

When heating a solution to boiling on a hot plate, start by starting and stabilizing the stir function. Then, turn the heat to a medium heat to start. If necessary, turn up the heat setting after waiting about ten minutes without seeing boiling.

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How many bromine atoms are present in 39.0 g of ch2br2?
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Answer is: there is  2,69·10²³ atoms of bromine.
m(CH₂Br₂) = 39,0 g.
n(CH₂Br₂) = m(CH₂Br₂) ÷ M(CH₂Br₂).
n(CH₂Br₂) = 39 g ÷ 173,83 g/mol.
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n(CH₂Br₂) : n(Br) = 1 : 2.
n(Br) = 0,448 mol.
N(Br) = n(Br) · Na.
N(Br) = 0,448 mol · 6,022·10²³ 1/mol.
n(Br) = 2,69·10²³.
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