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vivado [14]
3 years ago
13

3. Why does å star begin shining?

Chemistry
2 answers:
steposvetlana [31]3 years ago
8 0

Answer:

a star shines due to thermonuclear fusion

Explanation:

Nimfa-mama [501]3 years ago
8 0

Answer:

If heated and intense enough nuclear fusion is in the center of the star will continue. It takes a star the size of our sun about 20 million years to reach this point. Once it starts nuclear fusion, the star can shine for about 10 billion years.

Explanation:

You might be interested in
An iron has a net charge of 3+. If this job has 8 protons, how many electrons does it have
kati45 [8]

Answer:

5 electrons

Explanation:

When an atom loses are gain the electrons ions are formed.

There are two types of ions.

Anion

Cation

1 = Anion

It is formed when an atom gain the electrons. when atom gain electron negative charge is created on atom. For example.

X + e⁻ → X⁻

2= Cation

It is formed when an atom loses the electrons. when atom lose electron positive charge is created on atom. For example.

X → X⁺ + e⁻

When an atom loses three electrons +3 charge is created. If this atom have 8 protons it means there were 8 electrons too. When it lost three electrons then remaining number of electrons are 5.

X → X³⁺ + 3e⁻

4 0
3 years ago
Mercury is a liquid meteal but it is not hard? how can we say it is a metal
NNADVOKAT [17]
What's the problem ? Hardness is not the definition of a metal. You need to expand your thinking. EVERY element is solid, liquid, and gas, over different ranges of temperature ... including all of the metals. There are only TWO elements that are liquid AT ROOM TEMPERATURE, and mercury is one of them. But on a mild day at the south pole, mercury is solid too.
7 0
3 years ago
How is matter and energy conserved when liquid is frozen
Brut [27]

Answer:

The big energy change when water freezes is in the potential energy of interactions between the water molecules.

Explanation:

I am not to sure if this is correct, but I hope it helps in some way.

3 0
3 years ago
Oxidation of Nitrogen in NO2​
tiny-mole [99]

Explanation:

oxidation of Nitrogen in NO2 is +4

8 0
2 years ago
A compound contains only nitrogen and oxygen and has a formula mass of 44.02. What is the formula of the compound
ch4aika [34]
N₂O

N = 14.01 amu
O ≈ 16 amu

14.01 × 2 = 28.02 ; 2 Nitrogen

44.02 - 28.02 = 16 ; 1 Oxygen

Check

28.02 + 16 ≈ 44.02amu
8 0
3 years ago
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