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3 years ago

Can you help with this thanks

Chemistry

1 answer:

pickupchik [31]3 years ago

8 0

Answer:

Steam escapes from a teapot. Is a chemical reaction occurring? No, because liquid to gas would be a physical change, not a chemical change

Explanation:

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The empirical formula of styrene is CH; its molar mass is 104.1 g/mol. What is the molecular formula of styrene?

Natalija [7]

You got the answer correct. If you would double check
given:C (12 g/mol) H (1 g/mol).

12(8) + 1(8) = 104 g/mol

and for C2H4
12(2)+1(4) = 28g/mol

Also, chemical formula of styrene is<span> C6H5CH=CH2.</span>

7 0

3 years ago

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[ ]transport moves substances from an area of high concentration to an area of low concentration.

Arisa [49]

Answer:

The answer is Diffusion.

Explanation:

Diffusion is a movement of molecules(substances) from a region of high concentration to a region of low concentration down a concentration gradient.

4 0

3 years ago

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1. What did Henri Becquerel discover about<br> radiation emitted from uranium salts?

Dmitriy789 [7]

Explanation:

When Henri Becquerel investigated the newly discovered X-rays in 1896, it led to studies of how uranium salts are affected by light. By accident, he discovered that uranium salts spontaneously emit a penetrating radiation that can be registered on a photographic plate.

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3 years ago

A molecule of ammonia (NH3) contains

mafiozo [28]

A molecule of ammonia clearly contains 1 nitrogen (N) atom and 3 of the hydrogen (H) atoms combined by sharing of the valence electrons of the atoms. Ammonia is a colorless gas and is usually characterized by its pungent odor.

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4 years ago

If air is a fluid, why do we not include the buoyant force caused by the displacement of air by the objects in this experiment?

uysha [10]

Archimedes' principle allows us to find that the reasons why the thrust is not written when a body is in the air is:

The thrust of air is about 800 times less than the thrust of a fluid

In general the other forces (weight, tension) are much greater than thrust

Archimedes' principle establishes that the thrust is equal to the weight of the dislodged liquid (fluid)

B = ρ g V

Where B is the thrust, ρ and V the density and volume of the fluid, respectively, g the acceleration due to gravity.

In the attachment you have a diagram of a system in equilibrium in air and water, we can see that in the two cases for a system in equilibrium

B -W = 0

B = W

Let's find the value of the thrust in each case and compare

$B_{air} = \rho_{air} g V_{air}$

$B_{water} = \rho_{water} \ g V_{water}$

Used the density

$\rho_{air} = \ 1.26 \ kg/m^3 \\\rho_{water} = 997 kg/m^3$

$B_{air} = 1.26 \ g \ V_{air}\\B_{water} = 997 \ g \ V_{water}$

Suppose that the volume of the two bodies is the same

$B_{water} = 792 B_{air}$ r

We can see that the thrust in air or other gas is about 800 times less than the thrust in liquids. This is the reason that in many problems the thrust is not written when the body is in the air.

In conclusion, using Archimedes' principle, we find that the reason why the healed thrust is not written for a body is in the air is:

The thrust of air is about 800 times less than the thrust of a fluid

In general the other forces (weight, tension) are much greater than thrust

Learn more about Archimedes' principle here:

brainly.com/question/787619

5 0

2 years ago