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3 years ago

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Select the correct answer. There are four samples on a laboratory table. Sample A. is a hard crystalline solid, which does not b

reak easily. Sample B is a solid that readily dissolves in water. Sample C is a liquid that evaporates at room temperature. Sample D is a colored liquid that conducts electricity. Based on this information, which sample is most likely to be a covalent compound?

2 answers:

harkovskaia [24]3 years ago

8 0

Answer is C for Plato users.

german3 years ago

3 0

Answer: Option (C) is the correct answer.

Explanation:

A covalent compound is formed by sharing of electrons between two chemically combining atoms.

A covalent bond will always form between non-metals.

Some properties of covalent compounds are as follows.

Covalent compounds are brittle in nature. This means they tend to break easily.

Covalent compounds have low melting and boiling point.

These compounds are unable to conduct heat and electricity.
Covalent compounds generally do not dissolve in water.

As covalent compounds have low melting and boiling point so, it is possible that they evaporate at room temperature.

Thus, we can conclude that sample C is a liquid that evaporates at room temperature, most likely to be a covalent compound.

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What prefix should be used to name a hydrocarbon that has a six-carbon parent chain?a.hex- b.meth- c.non- d.sept-

liberstina [14]

A. hex- Normally with 6, the prefix is hex-. For example a polygon having 6 sides is known as hexagon.

8 0

3 years ago

(I)how many atoms are present in 7g of lithium?

ICE Princess25 [194]

Answer :

(i) The number of atoms present in 7 g of lithium are, $6.07\times 10^{23}$

(ii) The number of atoms present in 7 g of lithium are, $1.204\times 10^{24}$

(iii) The number of moles of $F_2$ is, 1 mole

The number of moles of $CO_2$ is, 0.5 mole

The number of moles of $OH^-$ is, 1 mole

Explanation :

<u>Part (i) :</u>

First we have to calculate the moles of lithium.

$\text{Moles of }Li=\frac{\text{Mass of }Li}{\text{Molar mass of }Li}$

Molar mass of Li = 6.94 g/mole

$\text{Moles of }Li=\frac{7g}{6.94g/mol}=1.008mole$

Now we have to calculate the number of atoms present.

As, 1 mole of lithium contains $6.022\times 10^{23}$ number of atoms

So, 1.008 mole of lithium contains $1.008\times 6.022\times 10^{23}=6.07\times 10^{23}$ number of atoms

Thus, the number of atoms present in 7 g of lithium are, $6.07\times 10^{23}$

<u>Part (ii) :</u>

First we have to calculate the moles of carbon.

$\text{Moles of }C=\frac{\text{Mass of }C}{\text{Molar mass of }C}$

Molar mass of C = 12 g/mole

$\text{Moles of }C=\frac{24g}{12g/mol}=2mole$

Now we have to calculate the number of atoms present.

As, 1 mole of carbon contains $6.022\times 10^{23}$ number of atoms

So, 2 mole of carbon contains $2\times 6.022\times 10^{23}=1.204\times 10^{24}$ number of atoms

Thus, the number of atoms present in 7 g of lithium are, $1.204\times 10^{24}$

<u>Part (iii) :</u>

<u>To calculate the moles of </u> $F_2$ <u> :</u>

$\text{Moles of }F_2=\frac{\text{Mass of }F_2}{\text{Molar mass of }F_2}$

Molar mass of $F_2$ = 38 g/mole

$\text{Moles of }F_2=\frac{19g}{19g/mol}=1mole$

Thus, the number of moles of $F_2$ is, 1 mole

<u>To calculate the moles of </u> $CO_2$ <u> :</u>

$\text{Moles of }CO_2=\frac{\text{Mass of }CO_2}{\text{Molar mass of }CO_2}$

Molar mass of $CO_2$ = 44 g/mole

$\text{Moles of }CO_2=\frac{22g}{44g/mol}=0.5mole$

Thus, the number of moles of $CO_2$ is, 0.5 mole

<u>To calculate the moles of </u> $OH^-$ <u> ions :</u>

$\text{Moles of }OH^-=\frac{\text{Mass of }OH^-}{\text{Molar mass of }OH^-}$

Molar mass of $OH^-$ = 17 g/mole

$\text{Moles of }OH^-=\frac{17g}{17g/mol}=1mole$

Thus, the number of moles of $OH^-$ is, 1 mole

4 0

3 years ago

Which model best represents an element?

Kobotan [32]

Answer:

c. gold marbles because they have one type of atom

an element is a substance that is entirely made from one type of atom.

7 0

3 years ago

How is the composition of a meteorite relevant to finding out the composition of earth’s core?

boyakko [2]

Explanation:

Since scientists think planets and meteorites were made at the same time and in the same place, it seems logical that whatever a meteorite is made of is also what planets are made of.

5 0

2 years ago

Read 2 more answers

An ionic bond can be formed when one or more electrons are(1) equally shared by two atoms(2) unequally shared by two atoms(3) tr

irakobra [83]

<span>Correct answer: option 4 i.e. transferred from valence shell of atom atom to the valence shell of another atom.

Reason:
<em>Ionic bonds are preferentially formed when there is large difference in electronegativity of bonding atoms</em>.

Atom that is highy electronegative in nature tends to accept electron from electropositive element. Stability of both of these atoms increases because, during the process to exchange of electrons, they acquire the electronic configuration of nearest inert gas.

For example: In NaCl, Na donates the proton to Cl. In ionized form, Na acquires the electronic configuration of 1s2 2s2 2p6, while electronic configuration of Cl becomes 1s2 2s2 2p6 3s2 3p6. Thus, in present case, electron is transferred from valence shell of Na to valence shell of Cl</span>

8 0

3 years ago