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gulaghasi [49]
3 years ago
5

Correct each of the following statements: (a) In the modern periodic table, the elements are arranged in order of increasing ato

mic mass. (b) Elements in a period have similar chemical properties. (c) Elements can be classified as either metalloids or nonmetals.
Chemistry
1 answer:
marissa [1.9K]3 years ago
6 0

Answer:

(a) Correct - In modern periodic table, the atoms are arranged in the order of increasing atomic number.

b)  Correct - Elements in a group have similar chemical properties.

(c)  Correct - Elements can be classified as metals, metalloids or nonmetals.

Explanation:

(a)  Correct - In modern periodic table, the atoms are arranged in the order of increasing atomic number.

Mendeleev's periodic table was the one in which the elements are arranged in the order of increasing atomic mass and thus that have limitations and as a result modern periodic table was introduced in which the elements are arranged in the order of increasing atomic numbers.

(b)  Correct - Elements in a group have similar chemical properties.

The modern periodic table consists of 18 groups in which the general electronic configuration is same due to which the elements in the same group usually shows same chemical properties.

(c)  Correct - Elements can be classified as metals, metalloids or nonmetals.

Based on the properties the elements can be classified as:

Metals are the good conductors of the heat and the electricity, and are malleable and ductile in nature. Most of them are solids at room temperature and have a characteristic silvery shine.  

Nonmetals usually are poor conductors of the heat and the electricity, and are not malleable/ductile and non metals can be gaseous, liquid and solids.

Metalloids are intermediate in the properties of metals and non metals.

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A buffer solution is composed of 4.00 4.00 mol of acid and 3.25 3.25 mol of the conjugate base. If the p K a pKa of the acid is
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<u>Answer:</u> The pH of the buffer is 4.61

<u>Explanation:</u>

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We are given:

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What is the theoretical yield of Calcium if we begin with 12.6 grams of Aluminium?
AlladinOne [14]

The question is incomplete, here is the complete question:

The given chemical reaction is:

2Al+3Cu(NO_3)_2\rightarrow 3Cu+2Al(NO_3)_3

What is the theoretical yield of Calcium if we begin with 12.6 grams of Aluminium?

<u>Answer:</u> The theoretical yield of copper is 44.48 grams

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\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}     .....(1)

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The given chemical equation follows:

2Al+3Cu(NO_3)_2\rightarrow 3Cu+2Al(NO_3)_3

By Stoichiometry of the reaction:

2 moles of aluminium produces 3 moles of copper

So, 0.467 moles of aluminium will produce = \frac{3}{2}\times 0.467=0.7005mol of copper

Now, calculating the mass of copper  from equation 1, we get:

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Moles of copper = 0.7005 moles

Putting values in equation 1, we get:

0.7005mol=\frac{\text{Mass of copper}}{63.5g/mol}\\\\\text{Mass of copper}=(0.7005mol\times 63.5g/mol)=44.48g

Hence, the theoretical yield of copper is 44.48 grams

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3 years ago
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