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Flura [38]
3 years ago
9

20.What do carbon and silicon have in common?

Chemistry
1 answer:
MAXImum [283]3 years ago
3 0

Answer:

i think it's C

Hope It Helps!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :D

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What is the empirical formula for a compound that has 57.5%
Rainbow [258]

Answer:

c

Explanation:

use %composition given to calculate emperical 4mular

8 0
3 years ago
Why is Jon Dalton’s discovery important to science? Help please
Veronika [31]

Answer:

Dalton expressed his assumption in A Modern Model of Chemical Theory that atoms of various elements should be uniformly differentiated, based on their differing atomic weights. In doing so, he became the first scientist to explain atom behavior as regards weight measurement.

Explanation:

8 0
2 years ago
A compound in a copper ore has the following percentage composition by mass:
AveGali [126]
1) since we are given percentages, we can assume we have 100 grams of the molecule.

55.6 % Cu ----> 55.6 grams Cu
16.4 % Fe------> 16.4 grams Fe
28.0% S--------> 28.0 grams S

2) convert each gram to moles using the molar masses given

55.6 g Cu \frac{1 mol}{63.5 g} = 0.876 mol Cu
16.4 g Fe \frac{1 mol}{56.0 g} = 0.293 mol Fe
28.0 gS \frac{1 mol}{32.0} = 0.875 mol S

3) we divide the smallest value of moles (0.293) to each one.

Cu --> 0.876 / 0.293= 3
Fe---> 0.293 / 0.293= 1
S-----> 0.875 / 0.293= 3

4) let's write the empirical formula

Cu₃FeS₃
6 0
3 years ago
Which arrow in the diagram represents the burning of fossil fuels? Choose 1 answer: Choose 1 answer: (Choice A) A arrow 1 (Choic
Alona [7]

Answer: arrow 4

Explanation:

7 0
2 years ago
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
Deffense [45]

Answer:

G - H2SO4

Explanation:

two hydrogen atoms and 4 oxygen atoms

8 0
2 years ago
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