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2 years ago

What is true about all the elements in the same column of the periodic table

2 answers:

8 0

The columns each one in the periodic table is called groups. The elements in each group contains the same number of electrons in the outer orbital.

for example, every element in the first column has one electron in its outer shell. In the second column,two electrons in outer shell.

katrin2010 [14]2 years ago

3 0

Each column is called a group.

<u>The elements in each group have the same number of electrons</u> in the outer orbital

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The pka of hf is 3.2 determine the pkb of hf?

Julli [10]

Well, first we must remember that

$pK_{a}+pK_{b}=14$

This is because

$K_{a}*K_{b}=10^{-14}$

$-log(K_{a}*K_{b})=-log(10^{-14})\\-logK_{a}+-logK_{b}=-log(10^{-14})\\pK_{a}+pK_{b}=14$

So then

$pK_{b}=14-pK_{a}=14-3.2=1.8$

7 0

3 years ago

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The nucleus of unstable _____ of an element will decay leading to emission of radiation.question 1 options:moleculescationsanion

Marta_Voda [28]

Isotopes of same element has different number of neutrons with different masses and having same number of protons and electrons.

Radioactive isotopes are those isotopes which are radioactive in nature. The unstable nucleus results in the radioactivity process and this process will go on until the stable isotope (element) forms.

Thus, the nucleus of unstable isotopes of an element will decay leading to emission of radiation.

6 0

2 years ago

Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular the

Nutka1998 [239]

Boyle's law which plays a major role in the kinetic-theory states that Volume and Pressure are inversely proportional

4 0

3 years ago

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Silicon carbide (SiC) is an important ceramic material made by reacting sand (silicon dioxide, SiO2) with powdered carbon at a h

makkiz [27]

Answer:

Percent yield of SiC is 77.0%.

Explanation:

Balanced reaction: $SiO_{2}+3C\rightarrow SiC+2CO$

Molar mass of SiC = 40.11 g/mol

Molar mass of $SiO_{2}$ = 60.08 g/mol

So, 100.0 kg of $SiO_{2}$ = $\frac{100.0\times 10^{3}}{60.08}$ moles of $SiO_{2}$ = 1664 moles of $SiO_{2}$

According to balanced equation, 1 mol of $SiO_{2}$ produces 1 mol of SiC

Therefore, 1664 moles of $SiO_{2}$ produce 1664 moles of SiC

Mass of 1664 moles of SiC = $(1664\times 40.11)g$ = 66743g = 66.74 kg (4 sig. fig.)

Percent yield of SiC = [(actual yield of SiC)/(theoretical yield of SiC)] $\times 100$ %

= $\frac{51.4kg}{66.74kg}\times 100$ %

= 77.0%

4 0

2 years ago

An electrochemical cell has the following standard cell notation.

Alona [7]

Explanation:

The given following standard cell notation.

Mg(s) | Mg^2+ (aq) || Aq^+(aq) | Aq(s)

Oxidation:

$Mg(s)\rightarrow Mg^{2+}+2e^-$ ....(1)

Magnesium metal by loosing 2 electrons is getting converted into magnesium cation. Hence, getting oxidized

Reduction:

$Ag^+(aq)+1e^-\rightarrow Ag(s)$ ...(2)

Silver ion by gaining 1 electrons is getting converted into silver metal. Hence, getting reduced.

Overall redox reaction: (1)+2 × (2)

$Mg(s)+2Ag^+(aq)\rightarrow Mg^{2+}+2Ag(s)$

4 0

3 years ago