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I am Lyosha [343]
3 years ago
15

WHAT ELEMENT IS THIS

Chemistry
1 answer:
LenaWriter [7]3 years ago
4 0

Answer: emission spectrum

Explanation:

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Plz tell me if I'm correct I am terrible at science if I'm not correct me plz correct me!!! I promise I'll give brainliest!!! Oh
adell [148]

Answer:

You are mostly correcet but im pretty sure that the nonmetals are brittle because they can break easily

Explanation:

5 0
3 years ago
When atoms gain electrons, they can become larger, because the addition of an electron increases electrostatic repulsion.
astra-53 [7]

Answer:True

Explanation: An anion has a larger radius than a neutral atom because it gains valence electrons. There are added electron/electron repulsions in the valence shell that expand the size of the electron cloud, which results in a larger radius for the anion.

hit the crown for me pls :)

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6 0
2 years ago
We can know what elements make up a star by studying the star's position in the
Amanda [17]
The answer is "night sky"
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7 0
3 years ago
The following thermochemical equation is for the reaction of sodium(s) with water(l) to form sodium hydroxide(aq) and hydrogen(g
ra1l [238]

Answer:

1) When 6.97 grams of sodium(s) react with excess water(l), 56.0 kJ of energy are evolved.

2) When 10.4 grams of carbon monoxide(g) react with excess water(l), 1.04 kJ of energy are absorbed.

Explanation:

1) The following thermochemical equation is for the reaction of sodium(s) with water(l) to form sodium hydroxide(aq) and hydrogen(g).

2 Na(s) + 2H₂O(l) ⇒ 2NaOH(aq) + H₂(g) ΔH = -369 kJ

The enthalpy of the reaction is negative, which means that 369 kJ of energy are evolved per 2 moles of sodium. The energy evolved for 6.97 g of Na (molar mass 22.98 g/mol) is:

6.97g.\frac{1mol}{22.98g} .\frac{-369kJ}{2mol} =-56.0kJ

2) The following thermochemical equation is for the reaction of carbon monoxide(g) with water(l) to form carbon dioxide(g) and hydrogen(g).

CO(g) + H₂O(l) ⇒ CO₂(g) + H₂(g)  ΔH = 2.80 kJ

The enthalpy of the reaction is positive, which means that 2.80 kJ of energy are absorbed per mole of carbon monoxide. The energy evolved for 10.4 g of CO (molar mass 28.01 g/mol) is:

10.4g.\frac{1mol}{28.01g} .\frac{2.80kJ}{mol} =1.04kJ

3 0
3 years ago
A scilentific experiment is repeated, but its results cannot be repeated by others. What can you conclude about the experiment?
klasskru [66]

If the results of the experiment on repeating are not same, it shows the results are not standard, there are some factors, which are not constant

6 0
2 years ago
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