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2 years ago

Which nonmetqls in the atmosphere and their combinations are essential to life on earth?

Chemistry

1 answer:

In-s [12.5K]2 years ago

8 0

Answer:

The acronym CHNOPS, which stands for carbon, hydrogen, nitrogen, oxygen, phosphorus, sulfur, represents the six most important chemical elements whose covalent combinations make up most biological molecules on Earth. All of these elements are nonmetals.

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A good experimental design should always:

Alenkinab [10]

Answer:

A good experimental design should always: include more than one independent variable. have predictable outcomes. be repeatable.

Explanation:

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3 years ago

Aluminum reacts with excess copper(II) sulfate according to the unbalanced reaction

labwork [276]

<u>Answer: </u>The mass of Cu produced is 4.88 g

<u>Explanation:</u>

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

Given mass of aluminum = 2.98 g

Molar mass of aluminum = 27 g/mol

Plugging values in equation 1:

$\text{Moles of aluminum}=\frac{2.98g}{27g/mol}=0.1104 mol$

The given chemical equation follows:

$2Al(s)+3CuSO_4(aq)\rightarrow Al_2(SO_4)_3(aq)+3Cu(s)$

By the stoichiometry of the reaction:

If 2 moles of aluminum produces 3 moles of Cu

So, 0.1104 moles aluminium will produce = $\frac{3}{2}\times 0.1104=0.1656mol$ of Cu

Molar mass of Cu = 63.5 g/mol

Plugging values in equation 1:

$\text{Mass of Cu}=(0.1656mol\times 63.5g/mol)=10.516g$

The percent yield of a reaction is calculated by using an equation:

$\% \text{yield}=\frac{\text{Actual value}}{\text{Theoretical value}}\times 100$ ......(2)

Given values:

% yield of product = 46.4 %

Theoretical value of the product = 10.516 g

Plugging values in equation 2, we get:

$46.4=\frac{\text{Actual value of Cu}}{10.516g}\times 100\\\\\text{Actual value of Cu}=\frac{46.4\times 10.516}{100}\\\\\text{Actual value of Cu}=4.88g$

Hence, the mass of Cu produced is 4.88 g

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3 years ago

HELP!!!!!! DUE IN 1 HOUR

Gnesinka [82]

Answer:

Group 17, 2, 7, 7 electrons

Explanation:

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3 years ago

How many moles of gallium chlorate, Ga(ClO3)3, must react in order to produce 674 kJ of energy according to the following reacti

Valentin [98]

Answer:

10.3 mol Ga(ClO₃)₃

Explanation:

Let's consider the following balanced thermochemical equation.

2 Ga(ClO₃)₃(s) ⇒ 2 GaCl₃(s) + 9 O₂(s) ΔH = - 130.4 kJ

According to the balanced thermochemical equation, 130.4 kJ of heat are released when 2 moles of gallium chlorate react. The number of moles of gallium chlorate that must react to produce 674 kJ of energy is:

674 kJ × 2 mol Ga(ClO₃)₃/130.4 kJ = 10.3 mol Ga(ClO₃)₃

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3 years ago

Explain 1 difference between Prokaryotic and Eukaryotic cells. plz plz plz plz plz help me plzzzzzzzzzzzzz all my points this du

tiny-mole [99]

Answer:

Prokaryotes are organisms made up of cells that lack a cell nucleus or any membrane-encased organelles. Eukaryotes are organisms made up of cells that possess a membrane-bound nucleus that holds genetic material as well as membrane-bound organelles.

Explanation:

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3 years ago

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Which nonmetqls in the atmosphere and their combinations are essential to life on earth?​

Which nonmetqls in the atmosphere and their combinations are essential to life on earth?