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NeX [460]
3 years ago
10

What were the first 5 planets that were observed? Why were those the only ones? Help pls!

Chemistry
1 answer:
pogonyaev3 years ago
4 0
Mercury Venus mars Jupiter Saturn
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Here is my question only answer if you understand this question​
sasho [114]
1- false
2- true
3- true
4- false
5- true
6- false
7- true
8- true
9- true
10- false

Hope it helps :)
8 0
3 years ago
Which of the following describes a physical property? A) gunpowder explodes B) when two substances are mixed with a precipitate
ValentinkaMS [17]
The correct answer is C) A substance changes color when heated, but changes back when cooled. Hope this helps.
5 0
3 years ago
Read 2 more answers
In a fluorine atom, on which energy level are the valence electrons found?
aivan3 [116]

Answer:

second energy level

Explanation:

Valence electrons are those electrons which are present in outer most orbital of the atom.

This can be easily found through the electronic configuration of atom.

Electronic configuration of F:

F₉ = 1s² 2s² 2p⁵

We can see that the valence electrons are present in second energy level of F atom.

There are seven valence electrons of fluorine.

It is called halogens.

Halogens are very reactive these elements can not be found free in nature. Their boiling points also increases down the group which changes their physical states. i.e fluorine is gas while iodine is solid.

Fluorine:

1. it is yellow in color.

2. it is flammable gas.

3. it is highly corrosive.

4. fluorine has pungent smell.

5. its reactions with all other elements are very vigorous except neon, oxygen, krypton and helium.  

6 0
3 years ago
The reaction takes place in water. What happens to the equilibrium when the pressure is increased? a)It favors formation of prod
OLga [1]

Answer:

I don't really get the options but it favoures the reactant side.

Explanation:

Increasing pressure favours the side with fewer moles of gas while decreasing pressure favours the side with the more moles of gas. E.g

If there is 0 moles of gas particles in the reactant side and 1 mole of gas particle in the product side, increasing pressure favours the reactants while decreasing pressure favours the product side.

With the explanations I have made, I hope the question is now clear to you.

6 0
4 years ago
Can you explain the relationship between the spinning pinwheel, the X, and the electron cloud model of the atom
Viefleur [7K]

they are different form of energy movement


8 0
3 years ago
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