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3 years ago

If calcium has two valence electrons and sulfur has six, how many calcium atoms are needed to form an ionic bond with sulfur?

Chemistry

2 answers:

Kipish [7]3 years ago

3 0

3 calcium atoms would be needed.

ch4aika [34]3 years ago

3 0

1 atom of calcium is needed to form an ionic bond with sulfur.

If calcium has two valence electrons and it needs to denote these two electrons to achieve a noble gas electronic configuration, and sulfur has six electrons, it needs two extra electrons to achieve a noble gas electronic configuration. Thus a ionic bond is formed between sulfur and calcium, in which 1 atom of calcium donate its 2 electrons to 1 atom of sulfur and formation of bond takes place.

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3 years ago

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3 years ago

1) The temperature inside my refrigerator is about 40 Celsius. If I place a balloon in my fridge that initially has a temperatur

viva [34]

Answer: The volume of the balloon when it is fully cooled by my refrigerator is 0.3 L

Explanation:

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Mathematically,

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

where,

$V_1\text{ and }T_1$ are the initial volume and temperature of the gas.

$V_2\text{ and }T_2$ are the final volume and temperature of the gas.

We are given:

$V_1=0.5L\\T_1=220^oC=(220+273)K=493K\\V_2=?\\T_2=40^oC=(40+273)K=313K$

Putting values in above equation, we get:

$\frac{0.5}{493}=\frac{V_2}{313}\\\\V_2=0.3$

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3 years ago

Water molecules have a polarity, which allows them to be electrically attracted to other water molecules and other polar molecul

-BARSIC- [3]

<h3>Answer:</h3>

Water molecules have a polarity, which allows them to be electrically attracted to other water molecules and other polar molecules by weak chemical bonds known as <u>Hydrogen Bond</u>.

<h3>Explanation:</h3>

Hydrogen Bond Interactions are those interactions which are formed between a <em>partial +ive</em> hydrogen atom bonded directly to most electronegative atoms (i.e. Fluorine, Oxygen and Nitrogen) of one molecule interacts with the <em>partial -ive</em> most electronegative atom of another molecule. These interactions are considered the strongest intermolecular interactions and are responsible for many stronger physical properties of water like, boiling point, viscosity, solubility e.t.c.

Attached figure shows the hydrogen bond interactions (green dashed lines) between water molecules. The partial charges are shown in red color.

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4 years ago