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3 years ago

The balanced chemical equation, C (s) + O2 (g) CO2 (g), can be expressed in words as...

2 answers:

4 0

You can eliminate three choices off the bat by seeing the last phrase of each equation is not correctly described as carbon dioxide. Therefore, the correct phrasing would be C. Solid carbon plus oxygen gas yields carbon dioxide gas.

Sati [7]3 years ago

4 0

Answer: The correct answer is Option 3.

Explanation:

When solid carbon burns in the presence of oxygen gas, it leads to the production of a gas known as carbon dioxide.

To write a chemical equation, we must follow some of the rules:

The reactants are always written on the left side of the direction arrow.
A '+' sign is added between the reactants, if more than one reactants are present.
An arrow is added after all the reactants are written. The arrow indicates the direction of reaction.
The products are always written on the right side of the direction arrow.
A '+' sign is added between the products, if more than one products are present.

Here, carbon and oxygen are the reactants and carbon dioxide is the product.

The chemical equation representing this reaction follows:

$C(s)+O_2(g)\rightarrow CO_2(g)$

Here, (s) represents that the carbon is in solid state and (g) represents that the oxygen and carbon dioxide are in gaseous state.

Hence, the correct answer is Option 3.

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Describe the organism that scientists believe was responsible for changing the composition of the early atmosphere. What is it c

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cyanobacteria, or blue-green algae. 
They used sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen. This change to the atmosphere was very important because the breathable air we enjoy today was created.

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3 years ago

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1. Which of the following elements is a transition metal?

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Where are the following elements to choose from?

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Haley is trying to pull an object upward. The below forces are acting on the object.

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Based on the given conditions, the gravitational force acted on the body is greater than the force upward by a quantity equal to 500 N. Therefore, the net force will cancel out and will remain an amount of 500N downward relative to the gravitational force exerted by the object.

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127) Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in

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Answer:

Explanation:

Since the sample was undiluted the number of colonies is the number that grew on the nutrient agar which is 36 colonies. If it was diluted for example let say 0.1 ml from a dilution in which 1 ml of the sample was added to 9 ml of water, and it grew colonies then 0.1 ml yielded 6 colonies, 1 ml of the diluted sample will yield 60 colonies and 10 ml will have 600 colonies and therefore the 1 ml undiluted sample will have 600 colonies.

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3 years ago

Calcium nitrate and ammonium fluoride react to form calcium fluoride, dinitrogen monoxide, and water vapor. How many grams of di

pychu [463]

Answer:

16.79 grams of dinitrogen monoxide are present after 31.3 g of calcium nitrate and 38.7 g of ammonium fluoride react completely. And calcium nitrate is a limiting reactant. Explanation:

$Ca(NO_3)_2(aq)+2NH_4F(aq)\rightarrow CaF_2(aq)+2N_2O(g)+4H_2O(g)$

Moles of calcium nitrate = $\frac{31.3 g}{164 g/mol}=0.1908 mol$

Moles of ammonium fluoride = $\frac{38.7 g}{37 g/mol}=1.046 mol$

According to reaction , 2 moles of ammonium fluoride reacts with 1 mole of calcium nitrate.

Then 1.046 moles of ammonium fluoride will react with :

$\frac{1}{2}\times 1.046 mol=0.523 mol$ calcium nitarte .

This means that ammonium fluoride is in excess amount and calcium nitrate is in limiting amount.

Hence, calcium nitrate is a limiting reactant.

So, amount of dinitrogen monoxide will depend upon moles of calcium nitrate.

So, according to reaction , 1 mole of calcium nitarte gives 2 moles of dinitrogen monoxide gas .

Then 0.1908 moles of calcium nitrate will give:

$\frac{2}{1}\times 0.1908 mol=0.3816 mol$ of dinitrogen monoxide gas.

Mass of 0.03816 moles of dinitrogen monoxide gas:

0.03816 mol × 44 g/mol = 16.79 g

16.79 grams of dinitrogen monoxide are present after 31.3 g of calcium nitrate and 38.7 g of ammonium fluoride react completely. And calcium nitrate is a limiting reactant.

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2 years ago