Is alcohol evaporating a chemical or physical change

Chemistry

1 answer:

snow_tiger [21]3 years ago

8 0

Physical change , the states are changing from liquid to gas

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Help plz already know 1&2

Aleonysh [2.5K]

3. A
4. B
5. A
6. E
7. A
8. C
9. A
10. B
Some of these were guesses but they were educated guesses. Best of luck. If some of them are wrong I am sorry. <span />

3 0

3 years ago

Iron crystallizes in a body-centered cubic unit cell. The edge length of this cell is 287 pm. Calculate the density of iron in g

Jlenok [28]

Answer:

Density = 7.87 grams per mL

Explanation:

Density is given by the formula:

$d=\frac{Z\times M}{a^{3}\times N_a}$

where

Z = effective number of atoms in one unit cell.

M = Molecular mass of the substance

a = edge length of unit cell

Na = Avogadro number = 6.022×10²³

In this case:

Z=2 as it is body-centered type unit cell

M = 56 g per mole for iron

a = 287 pm = $287\times10^{-10}\ cm$

Substituting the above values in the density formula we get:

$d=\frac{2\times56}{(287\times10^{-10})^{3}\times6.022\times10^{23}}=7.87\ g\ per\ ml$

Density of iron is 7.87 grams per mL.

7 0

3 years ago

Draw a Lewis structure for SO2 in which all atoms have a formal charge of zero. Explicitly showing the zero charges is optional.

Radda [10]

Answer:

See explanation and image attached

Explanation:

"A formal charge (FC) is the charge assigned to an atom in a molecule, assuming that electrons in all chemical bonds are shared equally between atoms, regardless of relative electronegativity" (chemlibretext).

We can obtain the formal charge from the formula;

Formal Charge = [number of valence electrons on atom] – [non-bonded electrons + 1/2number of bonds].

A structure in which SO2 has a zero formal charge is attached to this answer.

Image credit: Chemtopper