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mash [69]
3 years ago
13

Approximately _____ elements occur naturally on earth.

Chemistry
2 answers:
boyakko [2]3 years ago
5 0
90 elements occur naturally on earth.
Aliun [14]3 years ago
4 0
For the answer to the question above, the number of naturally occurring elements is actually in dispute, believe it or not. Some say 98, others say 88 and all cite various reasons. The traditionally accepted answer would be 92.
I hope this helps.
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A chemist reacted 11.50 grams of sodium metal with an excess amount of chlorine gas. The chemical reaction that occurred is show
iren [92.7K]

Actual yield is the definite mass of the product obtained from the reaction. The actual yield of the reaction is 24.83 gms.

<h3>What is the percentage yield?</h3>

Percentage yield is the proportion of the actual to the theoretical yield. The formula is given as,

% yield = Actual yield ÷ Theoretical yield × 100

The balanced chemical reaction is given as:

2 Na + Cl₂ → 2NaCl

From the reaction:

2 × 23 Na = 2 × 58.44 gm of NaCl

If, 1 gm of Na will produce = (2 × 58.44) ÷ (2 × 23)

Then, 11.50 gms sodium will produce, (2 × 58.44) ÷ (2× 23) × 11.50

= 29.22 g

So, the actual yield is calculated as:

= % yield × Theoretical yield ÷ 100

= 85 × 29.22 ÷ 100

= 24.83 g

Therefore, the actual yield of the reaction is 24.83 gms.

Learn more about actual yield here:

brainly.com/question/22257659

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8 0
3 years ago
A chemist weighed out 19.9 g of aluminum. Calculate the number of moles of aluminum she weighed out.
vodomira [7]
Aluminum is 26.982 grams per mole, so 26.982/19.9 will give you the moles 1.3558794
3 0
4 years ago
Liquids and gases are matter because they take up space and have
Aneli [31]
Volume. Gases and liquids are typically measured in milliliters (mL) or cubic centimeters (cm^3) - both of which are equivalent (1 mL = 1 cm^3).
8 0
3 years ago
The nth shell holds a minimum number of 2n2 electrons<br> True<br> False<br> Other:
BARSIC [14]

Answer: The statement the  n^{th} shell holds a minimum number of 2n^{2} electrons is true.

Explanation:

The alphabet 'n' denotes the principal quantum number whose value can be equal to 1, 2, 3, and so on but can never be zero.

Basically, 'n' is the number of shell of an atom and total number of orbitals present in a shell is n^{2}.

Each orbital can hold up to a maximum of wo electrons. Hence, the n^{th} shell can hold a minimum number of 2n^{2} electrons.

Thus, we ca conclude that the statement the  n^{th} shell holds a minimum number of 2n^{2} electrons is true.

8 0
3 years ago
Why is it necessary to assign organic chemistry exclusively to the study of carbon compounds?​
bonufazy [111]

Answer:

the significant of carbon.A compound found mainly in living things is known as an organic compound make up the cells and other structures of organism and carry out life processes.Carbon is the main element in organic compound,so carbon is essential to life on earth

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