CHEMISTRY HIGH SCHOOL

Which of the following elements has the strongest attraction for electrons? a. oxygen
b. sulfur
c. aluminum
d. boron

Answers

Answer 1
Answer:

The strongest attraction for electrons has been found in Sulfur. Thus, option B is correct.

The electrons are the subatomic particles revolving around the nucleus in the atom. The number of electrons in an atom has been responsible for the reactivity of the atom.

Strongest attraction of electrons

The number of electrons in the elements has been different. The element with higher number of electrons tends to have higher force of attraction toward the last electron, and thus have high ionization energy.

The number of electrons in the following elements has been:

  • Oxygen = 8
  • Sulfur = 16
  • Aluminum = 13
  • Boron = 5

The maximum attraction for electrons has been found in Sulfur. Thus, option B is correct.

Learn more about electrons, here:

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Answer 2
Answer: c.aluminium 


Although the strongest metals are alloys, made up of more than 1 metal (like steel).

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The atomic mass of an element is calculated using the(1) atomic number and the ratios of its naturally occurring isotopes(2) atomic number and the half-lives of each of its isotopes(3) masses and the ratios of its naturally occurring isotopes(4) masses and the half-lives of each of its isotopes

Answers

The atomic mass of an element is calculated using its masses and the ratios of its naturally occurring isotopes. The answer is number 3.  The rest of the choices do not answer the question above.

Answer:

#3

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Which compound would most likely turn litmus paper to a red color?a. CH₃CH₂CH₂OH 
b. CH₃CH(Br)CH(Br)CH₃
c. CH₃CH₂CH(Br)CH₃
d. CH₃CH₂CH₂COOH 
e. CH₃CH₂CH₂CH₃

Answers

answer D, because it's acid

Suppose you wanted to dissolve 106 g of Na2CO3 in enough H2O to make 6.00 L of solution.(1) What is the molar mass of Na2CO3? (2) What is the molarity of this solution?

Answers

The molarity of the solution is the ratio of moles of solute to the volume of the solution in L.  The molar mass of sodium carbonate is 106 g/mol and molarity is 0.167 M.

What is molar mass?

Molar mass is the mass of the compound that is given by the addition of the atomic mass of the individual atom present in the compound with respect to their stoichiometry coefficients.

The molar mass (M) of sodium carbonate can be given as,

\rm M(Na_(2)CO_(3)) = 2M(Na)+M(C)+3M(O)

Here mass of sodium = 23, carbon = 12 and oxygen = 16

Substituting values of the atomic mass we get:

\begin{aligned} &=2(23)+12+3(16)\n\n&=46+12+48\n\n&=106 \;\rm g/mol\end{aligned}

Hence, the molar mass of sodium carbonate is 106 g/mol.

Now molarity of sodium carbonate can be estimated as:

\begin{aligned}\rm Molarity &= \rm (mass)/(\rm molar \; mass * Volume)\n\n&= (106)/(106 * 6)\n\n&= 0.16 \;\rm M\end{aligned}

Therefore, 106 g/mol is the molar mass and 0.16 M is the molarity of sodium carbonate.

Learn more about molar mass and molarity here:

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M(Na2CO3)=2M(Na)+M(C)+3M(O)
                 =2(23)+12+3(16)
                 =46+12+48
                 =106 g/mol
the molar mass of Na2CO3 is 106 g/mol
m=106g      M=106 g/mol  n=m/M
n=m/M    n=106/106    n=1mol

Consider the mixture of ethanol, c2h5oh, and o2. how many molecules of co2, h2o, c2h5oh, and o2 will be present if the reaction goes to completion?

Answers

The reaction between ethanol and oxygen must be a combustion reaction to give carbon dioxide and water as products.

The reaction between ethanol, C_2H_5OH and oxygen, O_2 is as follows:

C_2H_5OH+O_2\rightarrow CO_2+H_2O

In order to balance the reaction (the number of atoms of each element in the reaction are same on both the sides that is product and reactant),  O_2 is multiplied by 3 in the reactant side and CO_2 is multiplied by 2 and H_2O is multiplied by 3 on product side.

So, the balanced reaction is:

C_2H_5OH+3O_2\rightarrow 2CO_2+3H_2O

From the balanced reaction it is clear that 1 mole of C_2H_5OH reacts with 3 moles of O_2 to give 2 moles of CO_2 and 3 moles of H_2O.

Since, 1 mole = 6.022* 10^(23) molecules (Avogadro's number)

So,

Number of molecules of C_2H_5OH = 6.022* 10^(23) molecules.

Number of molecules of O_2 = 6.022* 10^(23)* 3 = 18.066* 10^(23) molecules.

Number of molecules of CO_2 = 6.022* 10^(23)* 2 = 12.044* 10^(23) molecules.

Number of molecules of H_2O = 6.022* 10^(23)* 3 = 18.066* 10^(23) molecules.

Answer : The number of molecules of CO_2,H_2O,C_2H_5OH\text{ and }O_2 are 2, 3, 1 and 3 respectively.

Explanation :

The given balanced chemical reaction is,

C_2H_5OH+3O_2\rightarrow 2CO_2+3H_2O

Balanced chemical reaction is the reaction in which the number of atoms of an individual elements present on reactant side must be equal to the product side.

The species present on the left side of the right arrow is the reactant and the species present on the right side of the right arrow is the product.

From the balanced chemical reaction, we conclude that there are 1 molecule of C_2H_5OH, 3 molecules of O_2, 2 molecules of CO_2 and 3 molecules of H_2O.

Assume you do not know which peak in GC chromatogram corresponds to each alkene (and you are not sure whether the one with lower boiling point will appear first). Propose how you can identify which peak corresponds to which alkene in terms of "spiking products"

Answers

GC chromatograms often already have a library of compounds to determine what the substance is. In case the compound cannot be found in the library, one common alternative scientists use when performing is spiking.

Spiking involves gradually increasing the concentration of one specific compound, and looking for a rise in peak height. Here, you can identify which peak corresponds to the compound you spiked. You can do this for each alkene, to determine its peak and retention time.

in the equation 2kclo3 → 2kcl + 3o2, how many moles of oxygen are produced when 3.98 mol of kclo3 decompose completely?

Answers

 2 KClO₃=  2 KCl + 3 O₂

2 moles KClO₃ -------> 3 moles O₂
3.98 moles KClO₃ -----> ?

moles O₂ = 3.98 x 3 / 2

moles O₂ = 11.94 / 2

= 5.97 moles of O₂

hope this helps!
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