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gregori [183]

2 years ago

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Chemistry

2 answers:

I am Lyosha [343]2 years ago

6 0

Answer:

Question 1:

Answer: True

• A nucleus comprises of "proton and neutron"

Question 2:

Answer: True

• Lithium atom has 3 protons while helium atom has 2 protons.

Question 3:

Answer: False

• Molecular compounds are formed when elements are combined be it metal or non-metal.

• A compound formed from a metal and non-metal is an ionic compound.

Question 4:

Answer: False

• Noble gases are inert / unreactive. They don't undergo any reaction because they are very stable.

Question 5:

Answer: True

Question 6:

Answer: False

${ \rm{H _{2}O \: \dashrightarrow \: water}}$

• The formular in the question is for hydrogen peroxide.

Question 7:

Answer: False

• What you have to know is that, molecular compounds such as halogens are made of discrete particles with weak vander waals forces of attraction, hence energy required to break these forces is quite low. Hence low melting points.

Question 8:

Answer: True

• Ionic compounds such as sodium chloride are highly soluble in water.

Question 9:

Answer: False

• Water is a polar covalent compound because it is formed due to hydrogen and covalent bonding. It is polar because oxygen is highly electronegative than hydrogen.

Question 10:

Answer: False

• Check answer for question 4

Question 11:

Answer: False

• They form charge of +1

Question 12:

Answer: True

• This are called radicals

Question 13:

Answer: False

• least reactive families are halogens and noble gases.

Question 14:

Answer: True

• This is a situation of ionic bonding.

Question 15:

Answer: False

• It is made up of 3 atoms.

Sladkaya [172]2 years ago

4 0

True
True
True
False
False
False
False
True
False
False
False
True
False
True
False

After looking at answers I agree with the statement Chemistry is fun.

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Write Lewis structures for the following molecules: (a) ICl, (b) PH3, (c) P4 (each P is bonded to three other P atoms), (d) H2S,

spin [16.1K]

Answer : The Lewis-dot structure for the following molecules are shown below.

Explanation :

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.

In the Lewis-dot structure the valance electrons are shown by 'dot'.

Now we have to determine the Lewis-dot structure for the following molecules.

(a) The given molecule is, $ICl$

As we know that iodine and chlorine have '7' valence electrons.

Therefore, the total number of valence electrons in $ICl$ = 7 + 7 = 14

According to Lewis-dot structure, there are 2 number of bonding electrons and 12 number of non-bonding electrons.

(b) The given molecule is, $PH_3$

As we know that phosphorous has '5' valence electrons and hydrogen has '1' valence electrons.

Therefore, the total number of valence electrons in $PH_3$ = 5 + 3(1) = 8

According to Lewis-dot structure, there are 6 number of bonding electrons and 2 number of non-bonding electrons.

(c) The given molecule is, $P_4$

As we know that phosphorous has '5' valence electrons.

Therefore, the total number of valence electrons in $P_4$ = 4(5) = 20

According to Lewis-dot structure, there are 6 number of bonding electrons and 14 number of non-bonding electrons.

(d) The given molecule is, $H_2S$

As we know that sulfur has '6' valence electrons and hydrogen has '1' valence electrons.

Therefore, the total number of valence electrons in $H_2S$ = 6 + 2(1) = 8

According to Lewis-dot structure, there are 4 number of bonding electrons and 4 number of non-bonding electrons.

(e) The given molecule is, $N_2H_4$

As we know that nitrogen has '5' valence electrons and hydrogen has '1' valence electrons.

Therefore, the total number of valence electrons in $N_2H_4$ = 2(5) + 4(1) = 14

According to Lewis-dot structure, there are 10 number of bonding electrons and 4 number of non-bonding electrons.

(f) The given molecule is, $HClO_3$

As we know that chlorine has '7' valence electrons, oxygen has '6' valence electrons and hydrogen has '1' valence electrons.

Therefore, the total number of valence electrons in $HClO_3$ = 1 + 7 + 3(6) = 26

According to Lewis-dot structure, there are 12 number of bonding electrons and 14 number of non-bonding electrons.

(g) The given molecule is, $COBr_2$

As we know that bromine has '7' valence electrons, oxygen has '6' valence electrons and carbon has '4' valence electrons.

Therefore, the total number of valence electrons in $COBr_2$ = 4 + 6 + 2(7) = 24

According to Lewis-dot structure, there are 8 number of bonding electrons and 16 number of non-bonding electrons.

3 0

3 years ago

What are two ways that substances can pass through a cell membrane out of the cell

Paha777 [63]

Answer:

Passive transport, and Active transport

Explanation:

Do u need an explanation?

If so you can tell me and I'll edit it

Hope this helped a little!

3 0

3 years ago

The name given to the main group elements in group 2 is _______.

navik [9.2K]

Answer:

Alkaline Earth Metals

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2 years ago

Idk what is asking ?

castortr0y [4]

It's asking about air currents and temperature and how they affect each other. Since the land is hotter than the water during the day, it will create different pressures that force air to move. The wind will blow from the higher pressure over the water to lower pressure over the land causing the sea breeze. The opposite happens at night, and that causes a land breeze.

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3 years ago

Which is an unreliable source?

son4ous [18]

A source with opinions, no factual information.

8 0

3 years ago

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