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4 years ago

Hope me with all this slide :( TYSMMM

Chemistry

1 answer:

White raven [17]4 years ago

7 0

Answer:

exemples of elements with 1 valence electron: Hydrogen, lithium, potassium.

exemples of elements with 2 valence electrons: magnessium, calcium.

boron has 3 valence electrons. Phosphorus has 5 valence electrons.

carbon has 4 valence electrons.

exemples of elements with 5 valence electrons: Phosphorus, nitrogen

exemples of elements with 7 valence electrons: fluorine, chlorine

exemples of elements with 8 valence electrons: helium, argon

Explanation:

the easiest way to know the number of electrons are by the number of the group so 14 is 4, 16 is 6.

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Answer:

Explanation:

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3 years ago

5. A standardized mass was known to weigh exactly 5.0000g. It was weighed on a newly

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Answer:

Absolute error $= 0.001$

% Error $= 002$ 5

Explanation:

The absolute error is the the difference in the measured value and the actual value of a quantity.

Here the actual value is $5.0000$ grams

The measured value is $5.001$ grams

Absolute error

$5.001 - 5.000\\= 0.001$

Percent error

$= \frac{AE}{AV}$

Where AE stands for absolute error and AV stands for absolute value.

$= \frac{0.001}{5.000} * 100\\$

$= 0.02$ %

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4 years ago

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3 years ago

Read 2 more answers

If 20 grams of zinc reacts with hydrochloric acid, how much zinc chloride is produced?

Oksi-84 [34.3K]

Assuming there is excess acid, the equation for the reaction is Zn + 2HCl -> ZnCl2 + H2.
Mols of zinc = 20/65 (mass/relative atomic mass)
Ratio of Zn : ZnCl2 = 1 : 1
Hence mols of Zinc = mols of Zinc chloride
Mass of ZnCl2 = (20/65)(65+71)
= 41.8g

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4 years ago