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Nonamiya [84]
3 years ago
7

20 Points!! 10 Each Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!

Chemistry
2 answers:
True [87]3 years ago
5 0

Answer:

18.B

19.B

20.D

21.A

Explanation:

emmasim [6.3K]3 years ago
3 0

Answer:

1.a 2.d 3.c 4.b

Explanation:

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Explain why the metals conduct electricity.
aleksley [76]

Answer:

Metals conduct electricity because they have free Electrons in them which helps the current to move eaisily

6 0
3 years ago
Determine the velocity of a 55-kg skier whose kinetic energy is 8900 J
goldfiish [28.3K]

Answer:

Kinetic energy = 1/2mv^2

8900 j =1/2*55*v^2

v^2=8900*2/55

v^2=323.6

v=17.98

Explanation:

4 0
3 years ago
A 50.5 L flask contains 3.25 mol of an unknown gas at 288.6 K, what is the pressure of<br> this gas?
Ivahew [28]

Answer:

1.52atm is the pressure of the gas

Explanation:

To solve this question we must use the general gas law:

PV = nRT

<em>Where P is pressure in atm = Our incognite</em>

<em>V is volume = 50.5L</em>

<em>n are moles of gas = 3.25moles</em>

<em>R is gas constat = 0.082atmL/molK</em>

<em>And T is absolute temperature = 288.6K</em>

To solve pressure:

P = nRT / V

P = 3.25mol*0.082atmL/molK*288.6K / 50.5L

P = 1.52atm is the pressure of the gas

3 0
3 years ago
The compound Fe₂O3contains how many atoms?<br> 2<br> 3<br> 5<br> 7
BaLLatris [955]

Answer:

5

Explanation:

in this compound:

Fe has 2 atoms

oxygen has 3 atoms

4 0
2 years ago
A scientist has found two samples of radioactive material. The first sample has a mass of 1.0 g and an activity of 2.0 mc022-1.j
Degger [83]
1.5 g is your answer 
4 0
3 years ago
Read 2 more answers
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