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2 years ago

Which of the following will result in a chemical change?

Chemistry

2 answers:

brilliants [131]2 years ago

4 0

Answer:

i want to say It would be Abecause a chemical change is somthing that cant NOT be brought back to its areganal proproties.coal will never be able to be bavk the way it was!!

Explanation:

because a chemical change is somthing that cant not be brought back to its areganal proproties.coal will never be able to be back the way it was.

emmainna [20.7K]2 years ago

3 0

It’s B becouse the others only change state or don’t change the chemical composition of the material and That’s why it’s B

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How many moles of Carbon are in 3.06 g of Carbon

natta225 [31]

Answer:

$\boxed {\boxed {\sf 0.255 \ mol \ C }}$

Explanation:

If we want to convert from grams to moles, the molar mass is used. This is the mass of 1 mole. They are found on the Periodic Table as the atomic masses, but the units are grams per mole (g/mol) instead of atomic mass units (amu).

Look up the molar mass of carbon.

Carbon (C): 12.011 g/mol

Set up a ratio using the molar mass.

$\frac {12.011 \ g \ C}{ 1 \ mol \ C}$

Since we are converting 3.06 grams to moles, we multiply by that value.

$3.06 \ g \ C*\frac {12.011 \ g \ C}{ 1 \ mol \ C}$

Flip the ratio. This way, the ratio is still equivalent, but the units of grams of carbon cancel.

$3.06 \ g \ C* \frac{1 \ mol \ C}{12.011 \ g\ C}$

$3.06 * \frac{1 \ mol \ C}{12.011 }$

$\frac {3.06}{12.011 } \ mol \ C$

$0.25476646 \ mol \ C$

The original measurement of grams (3.06) has 3 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place.

0.25476646

The 7 in the ten-thousandth place tells us to round the 4 up to a 5.

$0.255 \ mol \ C$

3.06 grams of carbon is approximately 0.255 moles of carbon.

3 0

2 years ago

5,6-dimethyl-2-heptyne Due in 1 hr pls help me

mina [271]

Answer:

Please see the attached pictures.

Explanation:

☆ To ensure that each carbon has 4 bonds, fill the other bonds with Hs.

4 0

3 years ago

Stars which never disappear below the horizon are called:______ stars.

My name is Ann [436]

Answer:

Stars which never disappear below the horizon are called circumpolar stars.

4 0

2 years ago

Calculate the mass of diphosphorus pentoxide (P,05) that contains a trillion (1.000 x 10^2) phosphorus atoms. Be sure your answe

katrin2010 [14]

Answer: The answer is 94.25 × 10¯¹² g.

7 0

2 years ago

Bess [88]

Answer:

4Al + 3O₂ → 2Al₂O₃

Explanation:

4Al + 3O₂ → 2Al₂O₃

Only this reaction above obeys the law of conservation of mass. The others flout the rule.

The law of conservation of mass states that "matter is neither created nor destroyed in a chemical reaction but are simply transformed from one form to another".

By this law, the number of atoms on both sides of expression must be the same;

Number of atoms

Elements Left hand side Right hand side

Al 4 4

O 6 6

8 0

3 years ago