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Blababa [14]
2 years ago
7

Black holes cannot be seen. However scientists think that black holes exist because of their effect on surrounding matter. Descr

ibe another force or phenomenon that cannot be seen directly. Give examples of the effects of this force on everyday objects.
BTW this is not the right subject but there is no astronomy category so I am using this subject.
Chemistry
2 answers:
san4es73 [151]2 years ago
5 0

Answer:

l

Explanation:

l

lara31 [8.8K]2 years ago
4 0

Answer:

If Black Holes Are "Black," How Do Scientists Know They Are There? A black hole can not be seen because strong gravity pulls all of the light into the middle of the black hole. But scientists can see how the strong gravity affects the stars and gas around the black hole.

Explanation:

some examples; 1. Pushing a wheel barrow.

2. Opening or closing a door.

3. Squeezing wet clothes.

4. Gravitational force.

5. Brakes applied to stop a moving vehicle.

6. A football kicked harder that decreases due to the frictional force.

7. Rubbing a glass rod with a silk.

8. Pressure applied on a pin of a notice board.

9. Running

10. Pushing

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When a change in a physical property is observed, Select the correct answer below: it could be because of a physical change. it
lord [1]

Answer:

It could be because of a physical change.

Explanation:

A physical change affects a substance's physical properties, and a chemical change affects its chemical properties.

3 0
3 years ago
A mothball, composed of naphthalene (c10h8), has a mass of 1.64 g . part a how many naphthalene molecules does it contain?
OLga [1]
The molar mass of Naphthalene is 128g/mol
Therefore; a mass of 1.64 g of Naphthalene contains'
   = 1.64g/128 g
    = 0.0128 moles
But, from the Avogadro's law 1 mole of a substance contains 6.022 × 10^23 particles
Therefore 1 mole of Naphthalene contains 6.022×10^23 molecules
Hence; 0.0128 moles × 6.022 ×10^23 molecules
          = 7.716 × 10^21 molecules
3 0
3 years ago
What state of matter has no visible shape and fills its container?
Ilia_Sergeevich [38]
I believe it is b. I hope this helps you
8 0
3 years ago
Read 2 more answers
Inventos de la física que estén entre los 800 años y 1500<br> Ocupó 15 porfa
a_sh-v [17]
Creados entre los 800 y los 1500 o inventos que llevan de creación ese tiempo,puedes ser la pregunta un poco específica?
6 0
3 years ago
May someone assist, please...? I don't know how to do chemistry work...
EastWind [94]

Answer:

1) 90.0 mL

2) 11.25 M

3) 0.477 M

4) 144 mL

Explanation:

The main formula that will be used for all these calculations is:

                                                     C₁V₁ = C₂V₂

C stands for concentration and V stands for volume and the subscripts 1 and 2 indicate an initial concentration or volume and a final concentration or volume.

For each problem, it's best to start by figuring out what you have and what you need to find. Figure out if you're looking for an initial value or a final value.

1) We need to find the initial volume. So, take what values you have and plug them in and then solve for whatever variable:

5.00 M · V₁ = 500.0mL · 0.900 M                        - divide by 5.00

C₁ = 90.0 mL

2) This time we're finding the initial concentration:

20.0mL · C₁ = 150.0mL · 1.50 M                          - divide by 20.0mL

C₂ = 11.25 M

3) Now we're finding the final concentration:

12.00mL · 3.50 M = 88.0mL · C₂                         - divide by 88.0mL

C₂ = 0.477 M

4) Finally, we're looking for the final volume:

9.0mL · 8.0 M = 0.50 M · V₂                                - divide by 0.50 M

V₂ = 144mL

6 0
3 years ago
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