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love history [14]
3 years ago
9

Which statement is correct? (

Chemistry
1 answer:
Ronch [10]3 years ago
5 0
A is correct. If an atom has more protons than electrons it is positively charged, if more electrons than protons it is negatively charged. An equal number of each will make it neutral
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4 years ago
A sample of gas has a pressure of 100.0 KPa and 25C. Calculate the pressure if the temperature is changed to 125C while the volu
atroni [7]

Answer:

133.56kPa

Explanation:

Applying Pressure Law,

P/T = P'/T'....................... Equation 1

Where P = Initial pressure, T = Initial Temperature, P' = Final pressure, T' = Final Temperature.

From the question, we were asked to calculate P'

There, we make P' the subject of the equation

P' = PT'/T...................... Equation 2

Given: P = 100kPa, T = 25°C = (273+25) = 298K, T' = 125°C = (273+1250K = 398 K

Substitute these values into equation 2

P' = (100×398)/298

P' = 133.56kPa

Hence the pressure is 133.56kPa

6 0
3 years ago
Part H
Dvinal [7]

Answer:

See explanation.

Explanation:

-_-

Part H: C

Review:

1. joules

2. c

3. kinetic energy

4. mass

5. heat and light

6. conduction, convection, or radiation

7. the amount of energy in the universe is constant / energy can neither be created nor destroyed

8. Law of Conservation of Energy / Impossibility of Perpetual Motion

9. F

10. The earth's core.

11. Potential energy.

12. Nice to know.

a) Sir Seymour. The kinetic energy equation has velocity squared. Increasing velocity is much more destructive..

b) Jupiter. Weight is gravity acting on mass. Gravity increases with mass. So  Jupiter.

13. True.

14. Second Law of Thermodynamics describes heat flow from hot to cold objects. So, for the refrigerator to work, it needs to steadily expell hot air or objects inside won't cool as they releases heat to the surrounding air inside the refrigerator.

7 0
2 years ago
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