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3 years ago

How does heat transfer between objects

Chemistry

1 answer:

pentagon [3]3 years ago

8 0

Answer:

Explanation:

Heat can transfer between objects in two different ways. Generally, heat will travel from places of higher heat to places of lower heat.

The first is conduction. This is when the object being heated and releasing heat are in direct contact. Not as much heat is lost in this process, since the thermal energy has nowhere else to go except for the object it is touching. An example would be putting a kettle on a hot stove, but it could also be grabbing a cold pole with your relatively warm hands.

The second is convection. This is where heat is radiated into the air, and thus, transferred by the air, to another object. The actual heat that you feel is actually electromagnetic waves, and its transfer from an object is called electromagnetic radiation. Convection is the heat you feel from a near fire or a space heater. This is also why wind is present in our atmosphere.

There is also radiation. This is caused from the burning or breaking down of a substance. This might come from the sun.

I hope I did enough to deserve the 45 points!

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For a principal quantum number n, how many atomic orbitals are possible?

slavikrds [6]

Answer:

The total number of orbitals for a given n value is n2.

Explanation:

For a hydrogen atom with n=1, the electron is in its ground state; if the electron is in the n=2 orbital, it is in an excited state.

5 0

3 years ago

A weather system moving through the American Midwest produced rain with an average pH of 5.02. By the time the system reached Ne

bulgar [2K]

Answer:

The rain falling in New England is 2.29 times more acidic than the one in the American Midwest.

Explanation:

The acidity of a solution depends on the concentration of H⁺ ions ([H⁺]). We can calculate this concentration from the pH using the following expression.

pH = -log ([H⁺])

American Midwest

pH = -log ([H⁺])

5.02 = -log ([H⁺])

[H⁺] = antilog (-5.02) = 9.55 × 10⁻⁶ M

New England

pH = -log ([H⁺])

4.66 = -log ([H⁺])

[H⁺] = antilog (-4.66) = 2.19 × 10⁻⁵ M

The ratio of concentrations is:

$\frac{2.19 \times 10^{-5} M }{9.55 \times 10^{-6} M} =2.29$

The rain falling in New England is 2.29 times more acidic than the one in the American Midwest.

4 0

2 years ago

What do the superscripts and subscripts in the notation ^40 K represent?

raketka [301]

Explanation:

subscript is K

superscript is ^

subscript K means a unit of temperature like F or C

superscript ^ means to the power of

So all together it means to the power of 40 K

3 0

3 years ago

20.00 g of aluminum (al) reacts with 78.78 grams of molecular chlorine (cl2) all of each reactant is completely consumed and a s

marysya [2.9K]

The mass of the product is 98.78 g.

The word equation is

aluminum + chlorine → product

20.00 g + 98.78 g → x g

If each reactant is completely consumed, the Law of conservation of Mass tells us the mass of the product must be 98.78 g.

8 0

3 years ago

Which of the following are characteristics of vertebrates?

djverab [1.8K]

Answer:
All of the above

Explanation:
Vertebrates are a class of creatures falling under kingdom "Animalia" that are characterized by the presence of an internal skeleton composed of bones.

Vertebrates are characterized by the following:
1- presence of internal skeleton
2- developed brain
3- the presence of an advanced nervous system connected to the brain
4- presence of muscles that allow movement
5- protective skin
6- circulation of blood in the bodies in the vessels

Comparing the mentioned characteristics with the options given, we will find that the most suitable answer is: "all of the above".

Hope this helps :)

5 0

3 years ago

Read 2 more answers