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4 years ago

What group is calcium and sodium in?

Chemistry

2 answers:

LuckyWell [14K]4 years ago

8 0

Answer:

Calcium: Alkaline Earth

Sodium: Alkali Metal

Hope it helps!

Anarel [89]4 years ago

7 0

Answer:

Calcium is in Alkaline Earth

Sodium is in Alkali Metal

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How many molecules are in 2.0 moles of carbon dioxide?

zubka84 [21]

Answer:

There are 1.51 x 1024 molecules of carbon dioxide in 2.50 moles of carbon dioxide.

Explanation:

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3 years ago

The gravitational pull of the Moon has the greatest influence on the water levels of Earth’s ocean tides. If the distance betwee

kherson [118]

The water levels would lower, because as the moon gets farther away, it's gravitational pull decreases. Hope this helps! :)

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3 years ago

Photosynthesis in a plant is an example of which characteristic of living things?

lutik1710 [3]

Answer:

<h2><em><u>4. Ability to obtain and use energy</u></em></h2>

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3 years ago

The empirical formula of an organic compound is C2H4O. The molecular mass of the compound is 176g/mol.

Brrunno [24]

Answer:

The molecular formula of the compound is $C_{8}H_{16}O_{4}$ . The molecular formula is obtained by the following expression shown below

$\textrm{Molecular formula }= n\times \textrm{Empirical formula}$

Explanation:

Given molecular mass of the compound is 176 g/mol

Given empirical formula is $C_{2}H_{4}O$

Atomic mass of carbon, hydrogen and oxygen are 12 u , 1 u and 16 u respectively.

Empirical formula mass of the compound = $\left ( 2\times12+4+16 \right ) \textrm{ u} = 44 \textrm{ g/mol}$

$n = \displaystyle \frac{\textrm{Molecular formula mass}}{\textrm{Empirical formula mass}} \\n = \displaystyle \frac{176}{44} = 4$

$\textrm{Molecular formula }= n\times \textrm{Empirical formula}$

Molecular formula = 4 $\times$ $C_{2}H_{4}O$

Molecular formula is $C_{8}H_{16}O_{4}$

6 0

3 years ago

Answer it answer it answer it

Archy [21]

Answer:

Explanation:

A chemical change is when a new substance is created, which often has its own chemical properties, so A is the correct answer.

4 0

4 years ago