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il63
2 months ago
5

Which of the following refers to a chemical property?. . a. At room temperature, mercury is a liquid, but gold is a solid.. . b.

Water will not burn, but gasoline is flammable.. . c. A diamond is harder than chalk.. . d. Butter melts at room temperature, but gelatin does not.
Chemistry
1 answer:
alisha [2.9K]2 months ago
6 0
Among the listed options, the one indicating a chemical property is B. Water does not ignite, whereas gasoline is capable of burning. This distinction arises because both combustion and flammability are categorized as chemical properties. 
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How many molecules of PF5 are found in 39.5 grams of PF5?
Anarel [2989]

Response:

1.9 \times 10^{23} molecules of PF_5 can be found in 39.5 grams of PF_5.

Clarification:

Atomic weights: P= 31, F= 19,

The molar mass equals 1 atomic weight of P + 5 atomic weights of

 F= 31+5 × 19\times = 31+95

=126 g/mole

The number of moles in 39.5 gm of

equals \frac{Mass}{Molar mass}

 = \frac{39.5}{126}moles

 =0.3134 moles

1 mole of any substance encompasses

0.3131 moles comprises 0.3134

= 1.9 \times 10^{23} molecules

Thus, 1.9 \times 10^{23} molecules of PF_5 can be found in 39.5 grams of PF_5.

7 0
1 month ago
A sample of helium gas has a volume of 0.180L, a pressure of 0.800a and a temperature of 29 C. What is the new temp or gas of vo
Anarel [2989]

Solution:

The gas's new temperature is 604K

Justification:

Assuming standard temperature and pressure, we can determine the gas's temperature using the ideal gas law;

Step 1: Formulate the general gas law equation

P1V1/T1 = P2V2/T2

Step 2: Insert the values, converting as needed to standard units.

P1 = 0.800 atm

V1 = 0.180 L

T1 = 29°C = 273 + 29 = 302K

P2 = 3.20 atm

V2 = 90 mL = 90 * 10^-3 L = 0.09 L

Step 3: Solve for T2

The new gas temperature T2 is calculated as:

T2 = P2V2T1/(P1V1)

T2 = 3.20 * 0.09 * 302 / (0.800 * 0.180)

T2 = 86.976 / 0.144

T2 = 604K

The gas's new temperature is 604K.

7 0
2 months ago
Complete the two acid dissociation reactions for the ethylenediammonium ion and select the correct symbol for the equilibrium co
lorasvet [2795]

Answer:

Step 1:

N

H

+

3

C

H

2

C

H

2

N

H

+

3

(

a

q

)

⇌

A.

K

a

1

B.

K

a

2

C.

K

b

1

D.

K

b

2

Step 2:

N

H

2

C

H

2

C

H

2

N

H

+

3

(

a

q

)

⇌

A.

K

a

1

B.

K

a

2

C.

K

b

1

D.

K

b

2

Acid-

5 0
2 months ago
a 5.00 L sample of helium expands to 12.0 L at which point the pressure is measured to be 0.720atm. what was the original pressu
lorasvet [2795]

Response:

The conclusion to your inquiry is Pressure 1 = 1.73 atm

Clarification:

Data provided

Volume 1 = 5 l

Pressure 1 =?

Volume 2 = 12 l

Pressure 2 = 0.72 atm

Procedure

To resolve this issue, Boyle's law is applied

                 Pressure 1 x Volume 1 = Pressure 2 x Volume 2

-Finding Pressure 1

                 Pressure 1 = Pressure 2 x Volume 2 / Volume 1

-Replace values

                 Pressure 1 = 0.72 x 12 / 5

-Calculating

                Pressure 1 = 8.64/5

-Final outcome

                 Pressure 1 = 1.73 atm

5 0
1 month ago
A particular car has a gas mileage of 24.5 miles per gallon. If the cost of gas is $4.25 per gallon, and the car travels at a co
KiRa [2933]

Response:

$30.39

Rationale:

a lot of calculations

3 0
1 month ago
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