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Tomtit [17]
3 years ago
10

Select all that apply.

Chemistry
2 answers:
Ilya [14]3 years ago
5 0
The definition of heat transfer through convection involves the movement of a fluid that causes heat to move away from a hear source. That being said, convection can take place in a lake, air inside, and air outside since both liquids and gasses are considered to be fluids. I hope this helps. Let me know if anything is unclear.
mr Goodwill [35]3 years ago
5 0

<u>Answer:</u> The correct answers are a lake, the air in a room  and the air outside.

<u>Explanation:</u>

There are 3 modes by which heat can be transferred:

1. Conduction: In this process, heat is transferred whenever there is a direct contact between the two objects.

2. Convection: In this process, the heat is transferred whenever there is a movement of fluid. Fluid can be a liquid or gas.

3. Radiation: In this process, the heat is transferred whenever there is direct transfer of energy through the space.

From the given options,

Heat flow due to convection can occur in a lake, the air in a room and the air outside because, in these hot air rises up after capturing heat energy and cold air being more dense settles down and the process of heating continues.

Hence, the correct answers are a lake, the air in a room  and the air outside.

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What phenomenon in nature do scientists use to define the length of a meter? Why is this a better definition than “the length of
sergey [27]

Answer:

The natural phenomenon used to describe the length of a meter is the speed of light. The length of a meter is the length a light path travels in 1/(299792458) seconds through a vacuum.

The definition is better due to the uncertainty involved in the use of the length of a standard meter stick because the length of the meter stick could change due to atmospheric conditions from place to place

Explanation:

8 0
3 years ago
In an isothermal gas chromatography experiment using an ECD detector, 1.69 nmols of nchlorohexane, C6H13Cl, was added as an inte
prohojiy [21]

Answer:

The amount of Chlorodecane in the unknown is 0.105nmols

Explanation:

a) Since the GC is in an isothermal state, Chlorohexane C6H13Cl (1.69 nmols) because of its lower boiling point will elute first and Chlorodecane C12H21Cl will elute second.

The area of the first peak corresponding to Chlorohexane is 32434 units.

The area of the second peak corresponding to chlorodecane is 2022 units.

Since the response factor of the compound is not given in question and considering the response factor is same for both the compounds, the answer will be as follow:

1.69 nmols of Chlorohexane gives 32434 units

How much of chlorodecane gives 2022 units

By cross multiplication;

Moles of Chlorodecane = 2022*1.69/32434

                                         =0.105nmols

4 0
3 years ago
A molecule consisting of more than one element that are chemically combined.
BaLLatris [955]

Answer:

compound, but I could be wrong

4 0
3 years ago
Which type of wave do the particles in a medium move parallel to the direction that the waves move
Talja [164]
Longitudinal waves. In a longitudinal wave the particles in the medium move parallel  to the direction waves go. A good example can be the p-waves in an earthquake.
8 0
3 years ago
Why is cake so yummy
SOVA2 [1]
Because there is so much suger thats how it is so sweet and people like it!
4 0
3 years ago
Read 2 more answers
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