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3 years ago

How are the codes (chemical formulas) for pure substances different from those for mixtures?

Chemistry

1 answer:

Gnesinka [82]3 years ago

5 0

Answer : The chemical formula of pure substances are different from those of mixtures because all the matter that exists on earth can be classified into two categories namely; pure substances and mixtures.

A pure substance always consists of a single element or compound. Example Oxygen is formed only of oxygen (O) atoms; whereas the table salt which is formed only by sodium chloride (NaCl) molecules is a compound which is made up of pure elements. A pure substance cannot be further divided into its components.

A mixture is made up of different compounds and/or elements. It can be easily separated using any physical method. Example, sand, salt and saw dust mixed together as a mixture. Also, it will not have a definite chemical formula.

Please refer the attachment for better understanding.

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Which of the following is not true of carbon?

photoshop1234 [79]

We have to know which of the given statement is not true of carbon.

Not true statement of carbon is - it forms strong ionic bonds.

It can not form ionic bond. to produce ionic bond, carbon has to be converted into either C⁴⁺ or C⁴⁻.

The electronic configuration of C-atom is 1s²2s²2p⁴.

To form C⁴⁺ cation, four electrons must be removed from outermost shell of carbon atom which requires huge energy to supply.

To form C⁴⁻ anion, four electrons must be added to outermost shell of carbon atom which is not possible as outermost shell of C-atom does not have 2d orbital to accommodate extra electrons.

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4 years ago

Many classic experiments have given us indirect evidence of the nature of the atom. Which of the experiments listed below did no

uranmaximum [27]

Answer:

Option A, The Rutherford experiment proved the Thomson "plum-pudding" model of the atom to be essentially correct.

Explanation:

Thomson's plum pudding model:

Plum pudding model was proposed by J.J Thomson. In Thomson's model, atoms are proposed as sea of positively charge in which electrons are distributed through out.

Result of Rutherford experiment:

As per Rutherford's experiment:

Most of the space inside the atom is empty.

Positively charge of the atom are concentrated in the centre of the atom known as nucleus.

Electrons are present outside the nucleus and revolve around it.

As it is clear that, result of Rutherford experiment did not supported the Thomson model.

4 0

3 years ago

A chemical reaction in which one element replaces another element in a compound can be catergorized as a

Gwar [14]

Answer:

$\huge\boxed{\sf Single \ displacement \ reaction}$

Explanation:

<h2><u>Displacement reaction:</u></h2>

A reaction in which an element displaces or replaces another element of a compound is called a displacement reaction.

<h3><u>Types:</u></h3>

There are 2 types:

<h3><u>1. Single displacement reaction:</u></h3>

If one element displaces 1 other element of a compound, it is called single displacement reaction.
<u>Example</u>: $CuSO_4 +Fe \longrightarrow \ FeSO_4 + Cu$
Here, 1 element (Fe) displaces 1 other element (Cu) of a compound.

<h3><u>2. Double displacement reaction:</u></h3>

If two elements in two compounds displace one another, it is called double displacement reaction.
<u>Example:</u> $CuSO_4+NaOH \longrightarrow Cu(OH)_2 + Na_2SO_4$
Here, Copper and sodium both displace each other.

$\rule[225]{225}{2}$

4 0

2 years ago

Which sample contains more atoms:<br> 3.89 g of nickel or 6.61 g of silver?<br> Defend your answer.

Alenkinab [10]

Nickel contains more atoms

3 0

2 years ago

1. A rock with a mass of 66.5g<br>occupies 23.0 cm. Density?

telo118 [61]

Answer:

2.89 g/cm^3

Explanation:

Since density equals mass over volume (or also seen as $d=\frac{m}{v}$ ), simply divide 66.5 grams by 23.0 cm. This will output an answer of 2.89 g/cm^3.

7 0

3 years ago