CHEMISTRY MIDDLE SCHOOL

4. The density of a compound is 15.3 g/mL. What is the mass of 50 mL of the compound?a. 765g
b. 0.306g
c. 3.26g
d. 765mL

Answers

Answer 1
Answer:

Answer:

Option A. 765g

Explanation:

From the question given, we obtained the following:

Density = 15.3 g/mL

Volume = 50mL

Mass =?

Density = Mass /volume

Mass = Density x volume

Mass = 15.3 x 50

Mass = 765g

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What is the definition of states of matter

Answers

a state of matter  is one of  the distinct forms of matter  takes on.Four  states of matter are observable in every day life: solid,liquid,gas,plasma.
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3.00 moles of helium gas (He) are in a container with a volume is 2.00 liters and a temperature is at 298 K. What is the approximate pressure in kilopascals?

Answers

Answer:

3718.628 kPa.

Explanation:

  • We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm (P = ??? atm).

V is the volume of the gas in L (V = 2.0 L).

n is the no. of moles of the gas in mol (n = 3.0 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 298.0 K).

∴ P = nRT/V = (3.0 mol)(0.0821 L.atm/mol.K)(298.0 K)/(2.0 L) = 36.7 atm.

  • To convert from atm to kPa:

∵ 1.0 atm = 101.325 kPa.

∴ P = (36.7 atm)(101.325 kPa/1.0 atm) = 3718.628 kPa.

Which is an example of an atom?A)the smallest unit of Ne
B)the smallest unit of p4
C)the smallest unit of NH3
D)the smallest unit of H2O

Answers

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The box in the picture begins motionless, and then both forces are applied at the same time. Describe the resulting motion of the box. A) The box will not move. B) The box will move to the left. C) The box will move to the right. D) The box will move to the left and then the right.

Answers

It seems that you have missed to attach the given image for us to answer this question, but anyway, here is the answer. Based on the picture of a box which is motionless, the resulting motion of the box would be option B. The box will move to the left. Hope this answer helps.

The force being applied toward the right is greater. So the box will move in the direction of the greater force being applied. The box will move toward the right. Hope this helps!!!

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Answers

Using information I've learned doing GCSE core science, the air should contain:

78% Nitrogen (N2)
21% Oxygen (02)
0.035% Carbon Dioxide (CO2)
Fluctuating proportions of noble gases (such as argon) and water vapour

There are also trace amounts of many other gases.
In clean air there are 5 elements present.
Argon
Carbon Dioxide
Nitrogen
Oxygen
and Hydrogen
Hope this helps! :)

Paul placed an ice cube into a beaker on a hot plate. The ice cube changed from a solid to a liquid and then to a gas. During this process, which property of the ice cube remained unchanged

Answers

The fact that the ice cube was water/H2O did not change:
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