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soldi70 [24.7K]
3 years ago
7

Which of the answer choices best describes elements?

Chemistry
1 answer:
lianna [129]3 years ago
4 0
It can be a compound or a single element. An element is a pure substance that cannot be separated into simpler substances by chemical or physical means. There are about 117 elements, butcarbon, hydrogen, nitrogen and oxygen are only a few that make up the largest portion of Earth.

I would say d.
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Part A
MariettaO [177]

Answer:

96.3%

Explanation:

Data obtained from the question include:

Theoretical yield = 54g

Actual yield = 52g

Percentage yield =..?

The percentage yield can be obtain as follow:

Percentage yield = Actual yield /Theoretical yield x 100

Percentage yield = 52/54 x 100

Percentage yield = 96.3%

Therefore, the percentage yield of the reaction is 96.3%

3 0
3 years ago
What volume is occupied by 0.25 moles of nitrogen gas at 273 K and 1.50 atm.
Finger [1]

Answer:

3.74L

Explanation:

PV=nRT

V=nRT/P

= 0.25mol*0.0821LatmK^-1*273k/1.50atm

=3.74L

8 0
3 years ago
What is the reactants for this question?
kondor19780726 [428]
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8 0
3 years ago
Why is pure orange juice a mixture?
nordsb [41]
B Because the composition of the solution is uniform throughout, it is a homogeneous mixture. AOrange juice contains particles of solid (pulp) as well as liquid; it is not chemically pure. B Because its composition is not uniform throughout, orange juice is a heterogeneousmixture.
5 0
3 years ago
The number of proton, neutrons and electrons in oxygen atom
Ksenya-84 [330]

Answer:

in an oxygen atom there are:

protons:8

electrons:8

neutrons:8

Explanation:

this is because the atomic number of oxygen is 8 and that is the proton number and the electron number is the same as the atomic number

4 0
3 years ago
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