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3 years ago

The columns in the periodic table are also called A. sets. B. periods. C. families. D. energy levels

Chemistry

2 answers:

melomori [17]3 years ago

6 0

The columns in the periodic table are also called C. Families.

faust18 [17]3 years ago

3 0

It depends if you are talking about the ones that go up or down
or left and right

the ones that go up and down are called groups

the onesthat go left and right are periods

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What is the definition for molarity?

Akimi4 [234]

Molarity is a concentration unit, the number of moles of solute divided by the numbers of liters in a solution. Pertaining to chem

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4 years ago

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Which of the solutions below is a weak electrolyte? nacl(aq) koh(aq) hcl(aq) h2so3(aq) all of these?

Deffense [45]

Answer:-

H2SO3 (aq)

Explanation:-

NaCl, KOH and HCl ionic compounds.

Ionic compounds dissociate into ions in water.

Ions can carry electricity in water. So NaCl, KOH and HCl are all strong electrolytes.

H2SO3 is not a strong acid and dissociates to a small extent into ions in water.

Hence number of ions formed is less. Hence it is a weak electrolyte.

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3 years ago

Consider the following balanced equation for the following reaction:

balandron [24]

<u>Answer:</u> The amount of carbon dioxide formed in the reaction is 47.48 grams

<u>Explanation:</u>

For the given chemical equation:

$15O_2(g)+2C_6H_5COOH(aq.)\rightarrow 14CO_2(g)+6H_2O(l)$

To calculate the actual yield of carbon dioxide, we use the equation:

$\%\text{ yield}=\frac{\text{Actual yield}}{\text{Theoretical yield}}\times 100$

Percentage yield of carbon dioxide = 83 %

Theoretical yield of carbon dioxide = 1.30 moles

Putting values in above equation, we get:

$83=\frac{\text{Actual yield of carbon dioxide}}{1.30moles}\times 100\\\\\text{Actual yield of carbon dioxide}=\frac{1.30\times 83}{100}=1.079moles$

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Molar mass of carbon dioxide = 44 g/mol

Moles of carbon dioxide = 1.079 moles

Putting values in above equation, we get:

$1.079mol=\frac{\text{Mass of carbon dioxide}}{44g/mol}\\\\\text{Mass of carbon dioxide}=(1.079mol\times 44g/mol)=47.48g$

Hence, the amount of carbon dioxide formed in the reaction is 47.48 grams

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4 years ago

An atom that has 13 protons and 15 neutrons is isotope of the element

wariber [46]

Answer=c

Atoms dont "lose" or "gain" protons, if they did, they'd be completely different elements. So basically, anything with 13 protons is a form of Aluminum.

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3 years ago

Select the correct statement about isotopes. A. All the isotopes of an element are radioactive. B. Isotopes of the same element

frutty [35]

Answer: Option (B) is the correct answer.

Explanation:

Isotopes are the substances or species that contain same number of protons but different number of neutrons.

As it is known that atomic number means the total number of protons present in an atom. Hence, this also means that in isotopes atomic number of the species is same.

For example, isotopes of hydrogen are $^{1}_{1}H$ , $^{2}_{1}H$ , and $^{3}_{1}H$ .

Isotopes of only heavier elements are radioactive in nature as they have large difference in the number of protons and neutrons.

Thus, we can conclude that the statement isotopes of the same element have the same atomic number but differ in their atomic masses, is correct.

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