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2 years ago

Group 4A (or 14) elements have _________ electrons in their valence shell. A. 2 B. 3 C. 4 D. 5

Chemistry

2 answers:

pashok25 [27]2 years ago

8 0

The carbon group has 4 valence electrons

joja [24]2 years ago

7 0

Answer: Option (C) is the correct answer.

Explanation:

Elements of group 4A include carbon, silicon, germanium, tin and lead.

Also, it is known that valence shell is the shell which is present in the outermost side of an element.

Hence, the electrons present in this outermost shell are known as valence electrons.

For example, atomic number of carbon is 6 and its electronic configuration is $1s^{2}2s^{2}2p^{2}$ .

This means that there are 4 electrons present in the outermost shell.

Thus, we can conclude that group 4A (or 14) elements have 4 electrons in their valence shell.

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How much heat will be given off when 1500 g of water cools down by 20 C? please help and explain:)))

docker41 [41]

Answer:

126000J

Explanation:

From the question given, we obtained the following information:

M = 1500g

C = 4.2J/g°C

ΔT = 20°C

Q =?

Q= MCΔT

Q = 1500 x 4.2 x 20 =

Q = 126000J

7 0

3 years ago

HELP WITH A THESIS STATEMENT

lina2011 [118]

The second thesis statement is perfect. It supports the claim and presents main idea.

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2 years ago

A sample of sodium sulfite has a mass of 2.80 g.

Gnom [1K]

Answer:

For a: The number of sodium ions in given amount of sodium sulfite are $2.65\times 10^{22}$

For b: The number of sulfite ions in given amount of sodium sulfite are $1.325\times 10^{22}$

For c: The mass of one formula unit of sodium ions is $2.09\times 10^{-22}$ grams

Explanation:

The chemical formula of sodium sulfite is $Na_2SO_3$ . It is formed by the combination of 2 sodium $(Na^+)$ ions and 1 sulfite $(SO_3^{2-})$ ions

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of sodium sulfite = 2.80 g

Molar mass of sodium sulfite = 126 g/mol

Putting values in above equation, we get:

$\text{Moles of sodium sulfite}=\frac{2.80g}{126g/mol}=0.022mol$

For a:

Moles of sodium ions in sodium sulfite = (2 × 0.022) moles

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of particles

So, 0.022 moles of sodium sulfite will contain = $(2\times 0.022\times 6.022\times 10^{23})=2.65\times 10^{22}$ number of sodium ions

Hence, the number of sodium ions in given amount of sodium sulfite are $2.65\times 10^{22}$

For b:

Moles of sulfite ions in sodium sulfite = (1 × 0.022) moles

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of particles

So, 0.022 moles of sodium sulfite will contain = $(1\times 0.022\times 6.022\times 10^{23})=1.325\times 10^{22}$ number of sulfite ions

Hence, the number of sulfite ions in given amount of sodium sulfite are $1.325\times 10^{22}$

For c:

Molar mass of sodium sulfite = 126 g/mol

According to mole concept:

$6.022\times 10^{23}$ number of formula units are present in 1 mole of a compound

Or, $6.022\times 10^{23}$ number of formula units of sodium sulfite have a mass of 126 grams

So, 1 formula unit of sodium sulfite will have a mass of = $\frac{126}{6.022\times 10^{23}}\times 1=2.09\times 10^{-22}g$

Hence, the mass of one formula unit of sodium ions is $2.09\times 10^{-22}$ grams

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3 years ago

What is the volume of a gas at 756.14 Torr. If the volume was 588.56 mL at 588.56 torr.

creativ13 [48]

Answer:

Explanation:

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2 years ago

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a box contains 4 bags of sugar.the total mass of all 4 bags is 6kg.what is the mass of each bag in grams

andre [41]

The answer is 1.5kg because 6\4=1.5

3 0

3 years ago

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