All categories

3 years ago

Can someone help me pls I don’t have time Time is almost ran out pls help

Chemistry

1 answer:

pochemuha3 years ago

3 0

Answer:

Can you get a closer picture, then I can help! It looks like it says something on rain, hail and something else. I cant see it though! :)

Explanation:

You might be interested in

AL2O3 and ZNO are which oxides

Nesterboy [21]

Answer:

<em><u>Metal oxides</u></em>

Explanation:

Al2O3, ZnO and SnO are typical amphoteric oxides. Metal oxides are usually basic and they react with acids to form their respective salts

6 0

3 years ago

What does the suffix -ine mean in the word heroine?

Alla [95]

Answer:

Female

Explanation:

7 0

3 years ago

Read 2 more answers

Which of the following lists only include molecules? He h2o

lbvjy [14]

He is the only one that includes only mollecules

4 0

3 years ago

Calculate the percentage of the void space out of the total volume occupied by 1 mole of water molecules. The density of water i

gtnhenbr [62]

Answer:

The percentage of the void space out of the total volume occupied is 93.11%

Explanation:

A mole of water contains 2 atoms of hydrogen and 1 atom of oxygen.

To calculate the volume of a mole of water, we calculate 2 times the volume of the hydrogen atom and 1 times the volume of the oxygen atom

Let's calculate this one after the other.

For the hydrogen, formula for the volume will be

$V_{hydrogen$ = 2 × 4/3 × π × $r_{H}^{3}$

where $r_{H}^{3}$ = 37 pm which is read as 37 picometer (1 picometer = 10^-12 m) = 37 × $10^{-12}$ meters

Volume of the hydrogen = 8/3 × (37 × 10^-12)^3 = 4.05 * 10^-31

we multiply this by the avogadro's number = 6.02 * 10^23

= 4.05 * 10^-31 * 6.02 * 10^23 = 2.6 * 10^-8 m^3

We do same for thr oxygen, but this time we do not multiply the volume of the oxygen by 2 as we have only one atom of oxygen

Volume of oxygen = 4/3 * π * (73 * 10^-12) ^3 * avogadro's number = 9.81 * 10^-7 m^3

adding both volumes together, we have 1.24 * 10^-6 m^3 or simply 1.24 ml ( 0.01 m = 1 ml)

Dividing the molar mass of one mole of water by its density, we can get the volume of 1 mole of water

= (18g/mol)/(1 g/ml) = 18 ml/mol

Now we proceed to calculate the volume of void = Total volume - volume of molecule = 18 - 1.24 = 16.76 ml

Now, the percentage of void = volume of void/total volume * 100%

= 16.76/18 * 100% = 93.11%

7 0

3 years ago

A specimen of aluminum having a rectangular cross-section of 10 mm x 12.7 mm is pulled in tension with 35,500 N of force, produc

german

Explanation:

The given data is as follows.

Cross-section area of the rectangular is as follows.

Area = $10 mm \times 12.7 mm$

= $127 \times 10^{-6} m^{2}$

= $1.27 \times 10^{-4} m^{2}$

Tension applied on the specimen is 35,500 N

Now, formula to calculate the modulus of elasticity for a material of aluminium is as follows.

E = 70 GPa

= $70 \times 10^{9} Pa$

or, = $70 \times 10^{9} N/m^{2}$

Now, stress on the specimen is as follows.

$\sigma = \frac{P}{A}$

= $\frac{35000}{1.27 \times 10^{-4}}$

= $275.59 \times 10^{6} N/m^{2}$

According to Hook's law, we will calculate the resulting stain as follows.

$\sigma = E \epsilon$

$\epsilon = \frac{\sigma}{E}$

= $\frac{275.59 \times 10^{6}}{70 \times 10^{9}}$

= $3.937 \times 10^{-3} mm/mm$

Thus, we can conclude that the resulting strain is $3.937 \times 10^{-3} mm/mm$ .

7 0

3 years ago