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Nonamiya [84]
3 years ago
7

20 Points!! 10 Each Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!

Chemistry
2 answers:
True [87]3 years ago
5 0

Answer:

18.B

19.B

20.D

21.A

Explanation:

emmasim [6.3K]3 years ago
3 0

Answer:

1.a 2.d 3.c 4.b

Explanation:

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In which atmosphere layer do humans live most of their life
marysya [2.9K]
Troposphere, this is the layer of the atmosphere closest to the earths crust.
3 0
3 years ago
Rutherford’s gold foil experiment gave evidence that an atom is mostly empty space. true false
Sholpan [36]

The given statement is true .

<h3>What is Rutherford’s gold foil  experiment?</h3>
  • A piece of gold foil was hit with alpha particles, which have a favorable charge. Most alpha particles went right around. This showed that the gold particles were mostly space.
  • The Rutherford gold leaf investigation supposed that most (99%) of all the mass of an atom is in the middle of the atom, that the nucleus is very small (105 times small than the length of the atom) and that is positively captured.
  • For the distribution experiment, Rutherford enjoyed a metal sheet that could be as thin as practicable. Gold is the most malleable of all known metals. It can easily be converted into very thin sheets. Hence, Rutherford established a gold foil for his alpha-ray scattering experimentation.

To learn more about Rutherford’s gold foil experiment, refer to:

brainly.com/question/4113533

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4 0
1 year ago
If an atom has 11 atomic number and 11 neutrons how many electrons are there??
Fantom [35]

Answer:

11 electrons

Explanation:

The atomic number of sodium is 11. This tells us that sodium has 11 protons and because it is neutral it has 11 electrons. The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass).

5 0
3 years ago
How many atoms of hydrogen are there in 18g of water ?
Bingel [31]

Answer:

They are 1.204×10^24 atoms of hydrogen present in 18 grams of water. In order to calculate this,it is necessary to compute the number of hydrogen moles present in the sample.

6 0
2 years ago
Which of the following is an example of chemical energy being released or stored?
Monica [59]

Answer:

C

Explanation:

When something is chemical it is warped into a completely new substance and when coal is burned it is new so it is definitely C.

7 0
3 years ago
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