All categories

3 years ago

Which of the following represents a chemical change?

Chemistry

1 answer:

Nikitich [7]3 years ago

7 0

Answer:

Option B : burning of wood

Explanation:

Chemical change is a change where a new substance is created like when you will bur wood you get ash this is a new substance, so burning of wood is a chemical change.

You might be interested in

6.50 g of a certain Compound x, known to be made of carbon, hydrogen and perhaps oxygen, and to have a molecular molar mass of 1

gayaneshka [121]

Answer:

$C_{10}H_8$

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to find the molecular formula of the given compound by firstly calculating both moles and grams of carbon in carbon dioxide and hydrogen in water, as the only sources of these elements derived from the compound x due to its combustion:

$n_C=22.35gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molC}{1molCO_2}=0.51molC\\\\m_C=0.51molC*\frac{12.01gC}{1molC} =6.10gC$

$n_H=3.66gH_2O*\frac{1molH_2O}{18.02gH_2O}*\frac{2molH}{1molH_2O}=0.41molH\\\\m_H=0.41molH*\frac{1.01gH}{1molH}=0.41g$

Now, since the addition of carbon and hydrogen is about 6.50 grams, we infer the compound has no oxygen, that is why we now set the mole ratios in the empirical formula for both C and H as shown below:

$C:\frac{0.51mol}{0.41mol}= 1.24\\\\H:\frac{0.51mol}{0.51mol}= 1\\\\C_{1.24}H$

Yet it cannot be decimal, that is why we multiply by 4 to get the correct whole-numbered empirical formula:

$C_5H_4$

Whose molar mass is 64.09 g/mol, which makes the ratio of molar masses:

$\frac{128.g/mol}{64.09g/mol} =2$

Therefore, the molecular formula is twice the empirical one:

$C_{10}H_8$

Regards!

8 0

3 years ago

Twelve grams of carbon combine chemically with 4 grams of hydrogen to produce a

Eddi Din [679]

Answer:

Empirical Formula = C₁H₄ or CH₄

Explanation:

Data Given:

Mass of C = 12.0 g

Mass of H = 4 g

Step 1: <u>Calculate Moles of each Element;</u>

Moles of C = Mass of C ÷ At.Mass of C

Moles of C = 12.0 ÷ 12.0

Moles of C = 1.0 mol

Moles of H = Mass of H ÷ At.Mass of H

Moles of H = 4.0 ÷ 1.0

Moles of H = 4.0 mol

Moles of O = %O ÷ At.Mass of O

Moles of O = 53.924 ÷ 16.0

Moles of O = 3.370 mol

Step 2: <u>Find out mole ratio and simplify it;</u>

C H

1.0 4.0

1.0/1.0 4.0/1.0

1 4

Hence,

Empirical Formula = C₁H₄ or CH₄

6 0

3 years ago

What is the difference between nuclear fusion and nuclear fission?

True [87]

Answer:

[Fusion: Nuclei Fuse together and release energy] [Fission: Pressure and energy is released. This release of energy, is what causes the unstable atom to split to an isotope. I hope this helps!]

[isotopes can split too. At least some.]

Explanation:

Imagine you are trying to push something heavy, fusion is how you can join together and help each other to push this heavy material.

Fun fact! Heavier materials have more inertia against other forces acting on them.

You push harder, harder and harder! Until its pushed.

This will release a lot of energy which escalates to an extended length.

It might not be the finest example, it helped me to understand the basics.

Fission. Imagine having so much energy, in this case, try thinking of so many people in a tight space. What do you do? You will eventually start to escape and leave the room. This is the act of splitting the atom.

This won't be the same than how it was before.

Again, Energy is released (energy!!).

For anyone struggling with this, although it might not be the best idea, I would recommend researching the more advaced options for this topic.

This will give you a wide range of information which can develop your current knowledge about, "Nuclear Fission and Fusion."

It will be difficult, it definitely was for me when I was a child (starting to study science).

Just keep trying, you'll get it.

4 0

3 years ago

200 milliliters is equal to:

ehidna [41]

Answer:

0.2 Litres

Explanation:

There are 1000 milliliters in a liter so 200 millimeters is equal to (200/1000) 0.2 litres.

Not quite sure what type of answer you were looking for but I hope this hoped anyway!

7 0

3 years ago

Read 2 more answers

Would you expect the actual yield to be larger or smaller than the theoretical yield? Explain.

docker41 [41]

Smaller, there are many human and systematic errors that can alter the amount of product that can be obtained.

3 0

3 years ago