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3 years ago

What is a bone charcoal

Chemistry

1 answer:

sertanlavr [38]3 years ago

7 0

Answer:

Bone char is a porous, black, granular material produced by charring animal bones. Its composition varies depending on how it is made; however, it consists mainly of tricalcium phosphate 57–80%, calcium carbonate 6–10% and carbon 7–10%. It is primarily used for filtration and decolorisation.

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Based on the kinetic molecular theory, which of the following statements is correct about the particles in a sample of gas at a

fgiga [73]

Answer:

There is a lot of empty space between them.

Explanation:

The kinetic molecular theory postulates that a substance is made up of tiny particles called molecules. The molecules of a gas are in constant random motion and collide elastically with each other. They also collide with the walls of the container.

The magnitude of intermolecular forces of attraction between gas molecules is very small. Hence gas molecules are largely apart with a lot of empty space between gas molecules.

8 0

3 years ago

If an alloy is formed that is 50 mol% silver and 50 mol% gold, what is the karat number of the alloy?

Allisa [31]

Answer : 12 karat

Explanation : When pure gold is considered to be 24 karat then if its 50 mol% silver and 50 mol% silver then using karat scale calculation;

Karat/24 X 100 = 50 mol% (for gold) in alloy

So, Karat = (50 X 24) / 100 = 12 karat.

Hence the alloy will be of 12 karat.

7 0

3 years ago

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CO2 + H2O → H2CO3. If 495 milliliters of carbon dioxide at 25°C and 101.3 kilopascals reacts with excess water, what is the theo

exis [7]

Answer:

The theoretical yield of carbonic acid is 1.24 grams.

Explanation:

The balanced equation for the formation of carbonic acid by the reaction of carbon dioxide with water is:

CO₂ + H₂O → H₂CO₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactant and product participate:

CO₂: 1 mole
H₂O: 1 mole
H₂CO₃: 1 mole

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P * V = n * R * T

Moles of carbon dioxide can be calculated using ideal gas law equation. In this case:

P= 101.3 kPa= 1 atm
V= 495 mL= 0.495 L (being 1,000 mL=1 L)
n=?
R= 0.082 $\frac{atm*L}{mol*K}$
T= 25 C= 298 K (being 0 C=273 K)

Replacing:

1 atm* 0.495 L= n* 0.082 $\frac{atm*L}{mol*K}$ *298 K

Solving:

$n=\frac{1 atm*0.495 L}{0.082\frac{atm*L}{mol*K}*298 K }$

n= 0.02 moles

Then, by reaction stoichiometry 0.02 moles of carbon dioxide produces 0.02 moles of carbonic acid.

Since the molar mass of carbonic acid is 62.03 g/mol, then you can apply the following rule of three: if there are 62.03 grams in 1 mole, how much mass is there in 0.02 moles?

$mass=\frac{0.02 moles*62.03 grams}{1 mole}$

mass= 1.24 grams

<em><u>The theoretical yield of carbonic acid is 1.24 grams.</u></em>

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3 years ago

According to Archimedes' Principle, what condition has to be met for an object to float?

Finger [1]

C. The buoyant force must be greater to float, otherwise it would sink, its like a barrel in water, the more water weight in it the more it sinks, the more air weight the more it rises.

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3 years ago

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Which object would be the BEST to use and why?

yulyashka [42]

Answer:

Explanation:

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3 years ago