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3 years ago

Which of the following techniques can be used to separate a heterogeneous mixture into its component parts? (3 points)

Chemistry

2 answers:

avanturin [10]3 years ago

6 0

Answer:

Separation by density

Hope this helps

Nady [450]3 years ago

4 0

Sort by color . I KNOW FOR A FACT ITS THIS THE OTHER ONE IS WRONG.

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Can you please help me with this stoichiometry problem?

VMariaS [17]

Ah, stoichiometry. Have you ever done ratios before?

When you are given chemical reactions, all of the moles of reactant and product are proportional. This means that they're in ratio. Say we double the number of moles of water to 12 moles. How many moles do you think C2H6 will have? It'd be 4 moles, since just like water it was doubled since they're in proportion.

You can also think about that example above like a literal ratio. Since the original ratio is 2:6, it then turns into n:12, with n being the unknown number of moles of C2H6. Since ratios we know that ratios are always equal can be converted to fraction:

2/6 = n/12
Cross multiply:
24 = 6n
n = 4 moles

Makes sense? On to the actual question.

We're looking at the proportion between oxygen and carbon dioxide. Let's write that into a ratio:

7:4

Since there are seven moles of oxygen and four moles of carbon dioxide.

The number of moles of carbon dioxide is reduced to 1 mole. You could simply divide seven by 4 to find your answer (Since 4 was divided by 4 to make 1), but let's use the ratio method just in case questions in the future aren't this convenient:

7:4 becomes n:1

Convert to fraction:
7/4 = n/1

Cross multiply;
7 = 4n

Divide:
n = 7/4

Convert to decimal:
n = 1.75

The answer is Option C, 1.75 moles.

Let me know if you want me to explain anything I did here.
Good luck!
-T.B.

7 0

4 years ago

3. (04.02 MC) Which component is missing from the process of photosynthesis? Carbon Dioxide + Water + ________ Glucose + Oxygen

IgorLugansk [536]

Answer:

Sunlight

Explanation:

Sunlight is always neccesary in photosynthesis

6 0

3 years ago

A runner wants to run 10.4 km k m . She knows that her running pace is 8.0 mi/h m i / h .

mars1129 [50]

Answer:

Approximately 49 minutes.

Explanation:

1 mile = 1.6 km

So 8.0 x 1.6 km

Minutes required: $\frac{10.4 times 60 }{8.0 times 1.6}$ = 48.75 minutes

I hope this helped :)

4 0

3 years ago

How many grams of krypton gas will occupy 2.55 liters at 1.25 atm if it occupies 3.75 liters at 0.750 atm at 255 K

tatiyna

Answer:

There will be 94.7 grams of krypton gas

Explanation:

Step 1: Data given

at 255K and 0.750 atm the volume is 3.75 L

At 1.25 atm the volume is 2.55 L

Molar mass of krypton = 83.798 g/mol

Step 2: Calculate number of moles

p*V = n*R*T

with p = the pressure of the krypton gas = 0.750 atm

with V = the volume of the krypton gas = 3.75 L

with n = the number of moles = TO BE DETERMINED

with R = the gasconstant = 0.08206 L*atm/ mol * K

with T = the temperature = 255 K

n = R*T / p*V

n = (0.08206 * 255)/ (0.750 * 3.75)

n = 0.744 moles

Step 3: Calculate new number of moles

P1*V1 = P2*V2

P1*V1 = n1*R*T

P2*V2 = n2*R*T

(P1*V1)/R*T = (P2*V2)/n2*R*T

Since R and T do not change we can write as followed:

(P1*V1) = (P2*V2) /n2

n2 = (P2*V2) / (P1*V1)

n2 = (2.55 *1.25)/(0.75*3.75)

n2 = 1.13 moles

Step 4: Calculate mass of krypton gas

mass = Number of moles * Molar mass

mass of krypton gas = 1.13 moles * 83.798 g/mol = 94.69 grams ≈ 94.7 grams

There will be 94.7 grams of krypton gas

5 0

3 years ago

WHAT IS THE NAME OF THE COMPOUND Co(BrO)3?

MatroZZZ [7]

Answer:

Explanation:

Cobalt bromate is the name of this compound

6 0

3 years ago