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sweet [91]
3 years ago
14

Give at least one example from industry where a mixture must be separated in order to obtain the materials that are useful to so

ciety.
Chemistry
1 answer:
deff fn [24]3 years ago
3 0

The answer is; crude oil and iron ore

Iron ore is used to make steel (mainly Fe). However, the raw material contains a mixture of impurities such as  pyrite and apatite that have to be removed. Crude oil also includes a mixture of different hydrocarbon and other impurities. Impurities such as water have to be removed and the hydrocarbon distilled to separate them.

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A substance is a base if it has a pH value greater than___<br>PLEASE ANSWER ASAP ​
WINSTONCH [101]

Answer:

A substance is basic or alkaline if it's pH is greater than 7.0.

8 0
3 years ago
How much heat must be transferred to 1600 g of iron to change the iron's
Artemon [7]

Answer:

A. 8600 J

General Formulas and Concepts:

<u>Thermochemistry</u>

Specific Heat Formula: q = mcΔT

  • q is heat (in J)
  • m is mass (in g)
  • c is specific heat (in J/g °C)
  • ΔT is change in temperature (in °C)

Explanation:

<u>Step 1: Define</u>

[Given] <em>m</em> = 1600 g

[Given] ΔT = 214 °C - 202 °C = 12 °C

[Given] <em>c</em> = 0.450 J/g °C

[Solve] <em>q</em>

<u>Step 2: Find Heat</u>

  1. Substitute in variables [Specific Heat Formula]:                                           q = (1600 g)(0.450 J/g °C)(12 °C)
  2. Multiply [Cancel out units]:                                                                             q = (720 J/°C)(12 °C)
  3. Multiply [Cancel out units]:                                                                             q = 8640 J

<u>Step 3: Check</u>

<em>Follow sig fig rules and round. We are given 2 sig figs as our lowest.</em>

8640 J ≈ 8600 J

Topic: AP Chemistry

Unit: Thermodynamics

4 0
3 years ago
HELP ME PLEASE <br> T-T thanks
lana [24]

Answer: You Would have to .

Explanation:

4 0
3 years ago
For the n = 3 electron shell, which of the following quantum numbers are valid? Check all that apply.
stealth61 [152]

Answer:

The valid quantum numbers are l=0, l=-2 and l= 2.

Explanation:

Given that,

n = 3 electron shell

Suppose, the valid quantum numbers are

l = 3

m = 3

l = 0

m = –2

l = –1

m = 2

We know that,

The value of n = 3

Principle quantum number :

Then the principal quantum number is 3. Which is shows the M shell.

So, n = 3

Azimuthal quantum number :

The azimuthal quantum number is l.

l=0,1,2

Magnetic quantum number :

The magnetic quantum number is

m=-2,-1,0,1,2

Hence, The valid quantum numbers are l=0, l=-2 and l= 2.

7 0
3 years ago
Read 2 more answers
Please help with chemistry question... It would help me tremendously and if you can, please show work :)?
Alexxandr [17]

Answer:

5.06 atm

Explanation:

Step 1:

Data obtained from the question. This includes:

Mass of S2O = 175g

Volume (V) = 16600 mL

Temperature (T) = 195°C

Pressure (P)

Step 2:

Determination of the number of mole of S2O in 175g of S2O.

Mass of S2O = 175g

Molar Mass of S2O = (32x2) + 16 = 64 + 16 = 80g/mol

Number of mole of S2O =.?

Number of mole = Mass/Molar Mass

Number of mole of S2O = 175/80

Number of mole of S2O = 2.1875 moles

Step 3:

Conversion to appropriate units.

It is essential to always express the various variables in the right units of measurement in order to obtain the desired answer in the right units.

For volume:

1000mL = 1L

Therefore, 16600mL = 16600/1000 = 16.6L

For temperature:

Temperature (Kelvin) = temperature (celsius) + 273

Temperature (celsius) = 195°C

Temperature (Kelvin) = 195°C + 273 = 468K

Step 4:

Determination of the pressure.

The pressure can be obtained by the application of the ideal gas equation. This is illustrated below:

Volume (V) = 16.6L

Temperature (T) = 468K

Number of mole (n) = 2.1875 moles

Gas constant (R) = 0.082atm.L/Kmol

Pressure (P) =

PV = nRT

P x 16.6 = 2.1875 x 0.082 x 468

Divide both side by 16.6

P = (2.1875 x 0.082 x 468) /16.6

P = 5.06 atm

Therefore, the pressure is 5.06 atm

6 0
4 years ago
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