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3 years ago

Which of these objects has kinetic energy?

Chemistry

1 answer:

Bingel [31]3 years ago

8 0

Answer:

Explanation:

Anything moving I'd using Kinetic Energy

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The air in a living room has a mass of 60 Kg and a specific heat of 1,020 J/kg°C. What is the change in thermal energy of the ai

arlik [135]

Answer:

Q = 306 kJ

Explanation:

Given that,

Mass, m = 60 kg

Specific heat, c = 1020 J/kg°C

The temperature changes from 20°C to 25°C.

Let Q be the change in thermal energy. The formula for the heat released is given by :

$Q=mc\Delta T$

Put all the values,

$Q=60\times 1020\times (25-20)\\\\Q=306000\ J\\\\or\\\\Q=306\ kJ$

So, 306 kJ is the change in thermal energy.

4 0

3 years ago

What did the photoelectric experiment demonstrate?

arlik [135]

Explanation:

When an electromagnetic wave like light hits a material, the electrons gets emitted. The emission of electrons is called photoelectric effect. The emitted electrons are called photoelectrons. In this process the transfer of energy takes place from light to an electron.

Hence, the correct option regarding the photoelectric experiment is (A) " Light can cause electrons to be released from the surface of a metal."

4 0

4 years ago

Calculate the number of formula units in 1.87 mol of NH4Cl

Whitepunk [10]

Hey I’m sorry bro I’m not sure if you are interested or t1 I can send link that you have to do that for you guys I can do that tomorrow if you want me to send you a link or if I say yes I will do that for you I can

7 0

3 years ago

Acrostic poem for matter

Feliz [49]

Answer:

M-Molecules are always moving

A-Anything that has mass and volume

T-Temperature determines how fast the molecules are moving

T-The states of matter are gas,liquid, and plasma

E-Evaporation makes a liquid turn to gas

R-Racing molecules make the space between the molucles increase

Explanation:

<h2>MATTER</h2>

7 0

3 years ago

If 15 ml of water is added to a solution of hydrochloric acid with a pH of 2, how will the solution change?

Katarina [22]

Answer:

pH of the solution will slightly increase as it becomes less acidic for which it turns out to be more diluted.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to calculate the pH change of the solution by firstly calculating the HCl concentration, as equal to that of the hydrogen ions whose pH is 2 as this is a strong acid:

$[HCl]=[H^+]=10^{-pH}=10^{-2}=0.01M\\$

Now, since water is added to the solution, but we do not have the initial volume of this solution, we can ensure that its pH will increase, become less acidic, because the concentration of the acid, and consequently that of the hydrogen ions, is diminished as the volume is increased.

Best regards!

5 0

3 years ago