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3 years ago

What are fossils? *

Chemistry

2 answers:

Katarina [22]3 years ago

8 0

Answer:

mark me as the brainliest

Explanation:

Fossils are the preserved remains, or traces of remains, of ancient organisms. Fossils are not the remains of the organism itself! They are rocks. A fossil can preserve an entire organism or just part of one. Bones, shells, feathers, and leaves can all become fossils.

rosijanka [135]3 years ago

5 0

Answer is the preserved remains or traces of organisms (plants, animals, etc) that lived in the distant past.

Explanation:

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What element is being oxidized Fe2O3 + 3CO -> 2FE +3C02

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Fe because oxidation mean loss of oxygen and Fe lose the oxygen so Fe is oxidised

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2 years ago

A reaction was performed in which 3.6 g 3.6 g of benzoic acid was reacted with excess methanol to make 1.3 g 1.3 g of methyl ben

Anit [1.1K]

Answer: The percent yield of the reaction is 32.34 %

Explanation:

To calculate the number of moles, we use the equation:

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

For benzoic acid:

Given mass of benzoic acid = 3.6 g

Molar mass of benzoic acid = 122.12 g/mol

Putting values in equation 1, we get:

$\text{Moles of benzoic acid}=\frac{3.6g}{122.12g/mol}=0.0295mol$

The chemical equation for the reaction of benzoic acid and methanol is:

$\text{Benzoic acid + methanol}\rightarrow \text{methyl benzoate}$

By Stoichiometry of the reaction

1 mole of benzoic acid produces 1 mole of methyl benzoate

So, 0.0295 moles of benzoic acid will produce = $\frac{1}{1}\times 0.0295=0.108$ moles of methyl benzoate

Now, calculating the mass of methyl benzoate from equation 1, we get:

Molar mass of methyl benzoate = 136.15 g/mol

Moles of methyl benzoate = 0.0295 moles

Putting values in equation 1, we get:

$0.0295mol=\frac{\text{Mass of methyl benzoate}}{136.15g/mol}\\\\\text{Mass of methyl benzoate}=(0.0295mol\times 136.15g/mol)=4.02g$

To calculate the percentage yield of methyl benzoate, we use the equation:

$\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100$

Experimental yield of methyl benzoate = 1.3 g

Theoretical yield of methyl benzoate = 4.02 g

Putting values in above equation, we get:

$\%\text{ yield of methyl benzoate}=\frac{1.3g}{4.02g}\times 100\\\\\% \text{yield of methyl benzoate}=32.34\%$

Hence, the percent yield of the reaction is 32.34 %

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2 years ago

What is the meaning of nucleus

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the nucleus is an organelle containing the cell's chromosomes

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2 years ago

Identify the type of reaction and the products. MgF2+KNO3 ->

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Answer:

double replacement MgN2O6 + KF

Explanation:

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2 years ago

Which statement most completely defines a wave? *

Svetllana [295]

Answer:

A wave transfers energy through a medium or empty space without transporting matter.

Explanation:

A wave is a transmission of a disturbance from one point known as the source to another.
Waves may transfer energy through a material medium or a vacuum without transporting matter.
Waves that transfer energy from one point to another through a material medium are known as mechanical waves.
Electromagnetic waves, on the other hand, are those that do not require a material medium for transmission, the transfer of energy is through a vacuum.
Waves can also be either transverse or longitudinal waves based on the vibration of particles relative to the direction of wave motion.

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2 years ago

What are fossils? *​

What are fossils? *