All categories

2 years ago

34

Chemistry

1 answer:

ddd [48]2 years ago

7 0

Answer:

116 °C

Explanation:

The given parameters of the Substance Q are;

The boiling point of Q = 445°

The substance Q is a solid at room temperature

Given that Q has a single fixed boiling point, Q, is suspected to be a pure substance, and it will therefore also have a fixed single melting point above room temperature;

Therefore, the best option is option C. 116 °C, which is above a single temperature value above 116 °C

You might be interested in

How many grams of material is lost in the aqueous phase if two extractions are carried out on 100 mL of a 5% (m/v) aqueous solut

san4es73 [151]

Answer:

4.94g of material

Explanation:

Partition coefficient (Kp) of a substance is defined as the ratio between concentration of organic solution and aqueous solution, that is:

Kp = 8 = Concentration in Ethyl acetate / Concentration in water

100mL of a 5% solution contains 5g of material in 100mL of water. Thus:

8 = X / 100mL / (5g-X) / 100mL

Where X is the amount of material in grams that comes to the organic phase.

8 = X / 100mL / (5g-X) / 100mL

8 = 100X / (500-100X)

4000 - 800X = 100X

4000 = 900X

4.44g = X

Thus, in the first extraction you will lost 4.44g of material from the aqueous phase.

And will remain 5g-4.44g = 0.56g.

In the second extraction:

8 = X / 100mL / (0.56g-X) / 100mL

8 = 100X / (56-100X)

448 - 800X = 100X

448 = 900X

0.50g = X

In the second extraction, you will extract 0.50g of material

Thus, after the two extraction you will lost:

4.44g + 0.50g = 4.94g of material

6 0

2 years ago

If a balloon is filled with a mixture of helium and oxygen, which gas will escape faster? Why?

Serjik [45]

Answer:

The rate of leakage will be higher for helium; its molecules move about 3 times faster than oxygen’s

Explanation:

Step 1: Data given

Molar mass helium = 4.0 g/mol

Molar mass O2 = 32 g/mol

Step 2: Graham's law

Graham's Law of Effusion states that the rate of effusion of a gas is inversely proportional to the square root of the molecular mass : 1/(Mr)^0.5

Rate of escape for He = 1/(4.0)^0.5 = 0.5

Rate of escape for O2 = 1/(32)^0.5 = 0.177

The rate of leakage will be higher for helium; its molecules move about 3 times faster than oxygen’s

4 0

3 years ago

A zinc block with a mass of 230 g is given 1320 J of energy. What is the change in

Mariana [72]

Answer:

14.7°C

Explanation:

Q = m·ΔT·c

ΔT = $\frac{Q}{m*c}$

ΔT = $\frac{1320 J}{230 g* 0.39 J/gC}$

= 1320 J / ((230 g) * (.39 J/g°C)

ΔT = 14.7 °C

4 0

3 years ago

True or false If an atom is charged positive, it contains more protons than electrons.

tia_tia [17]

Answer:

TRUE

Explanation: because it is positively charged and protons are positive ions

7 0

3 years ago

How can the system restore equilibrium when disturbed (forward or reverse)

aivan3 [116]

It will be forward okay

7 0

3 years ago

Read 2 more answers