CHEMISTRY HIGH SCHOOL

Which mixture can be separated through filtration because one the substances is insoluble in water? Answers:

* NaChO and Pb(ClO)
* Na SO and SrSO
* NaNO and Pb(NO)
* NaC H O and Pb ( C H O )

Answers

Answer 1
Answer: B)Na2SO4 and SrSO4 is the answer

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What volume, in Liters, of a 2.00 M KCl solution contains 2.5kg of KCl? Molar mass of KCl= 74.55g/mole

Answers

According to the molar concentration, volume in liters of 2 M KCl solution is 16.76 L.

What is molar concentration?

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Volume required is obtained by molarity formula as, 2×74.55/2500=1/V=0.05964

∴V=1/0.05964=16.67 L.

Thus, 16.67 L of  2 M KCl solution contains 2.5 kg of KCl.

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C_(m)=(n)/(V_(r))\n\nn=(m_(s))/(M)\n\nC_(m)=(m_(s))/(MV_(r)) \ \ \ |*MV_(r)\n\nC_(m)MV_(r)=m_(s) \ \ \ |:C_(m)M\n\nV_(r)=(m_(s))/(C_(m)M)\n\n\nm=2.5kg=2500g\nM=74.55(g)/(mol)\nC_(m)=2(mol)/(L)\n\nV_(r)=(2500g)/(2(mol)/(L)*74.55(g)/(mol))\approx16.77L

A measurement of the amount of solute that is dissolved in a given quantity of solvent; usually expressed as mol/L.

Answers

Answer:Concentration is a measurement of the amount of solute that is dissolved in a given quantity of solvent; usually expressed as mol/L.

Explanation:

4.00 × 1023 molecules of H3PO4 have an approximate mass of

Answers

Answer : The approximate mass of H_3PO_4 is 65 grams.

Explanation :

First we have to calculate the moles of H_3PO_4.

As, 6.022* 10^(23) molecules of H_3PO_4 present in 1 mole of H_3PO_4

So, 4.00* 10^(23) molecules of H_3PO_4 present in (4.00* 10^(23))/(6.200* 10^(23))=0.664 mole of H_3PO_4

Now we have to calculate the mass of H_3PO_4.

\text{Mass of }H_3PO_4=\text{Moles of }H_3PO_4* \text{Molar mass of }H_3PO_4

Molar mass of H_3PO_4 = 98 g/mole

\text{Mass of }H_3PO_4=0.664mole* 98g/mole=65.072g\approx 65g

Therefore, the approximate mass of H_3PO_4 is 65 grams.
1 mole --------- 6.02 x 10²³ molecules
? mole --------- 4.00 x 10²³ molecules

moles =  (4.00 x 10²³) x 1 / 6.02 x 10²³

moles = ( 4.00 x 10²³) / ( 6.02 x 10²³ )

= 0.6644 moles

Molar mass H₃PO₄ = 98.0 g/mol

mass = 0.6644 x 98.0 = 65.1112 g

hope this helps!

Which is the best example of technological design

Answers

Well, actually there are many examples. But, the one i know best is the touch mouse by Microsoft.

Which lists the elements in order from least conductive to most conductive?A. nitrogen (N), antimony (Sb), bismuth (Bi)
B. nitrogen (N), bismuth (Bi), antimony (Sb)
C. antimony (Sb), nitrogen (N), bismuth (Bi)
D. bismuth (Bi), antimony (Sb), nitrogen (N)

Answers

Answer: Option (A) is the correct answer.

Explanation:

Nitrogen is a non-metal and it is known that non-metals do not conduct electricity. Thus, it will be least conductive out of the given options.

Whereas antimony (Sb) is a metalloid. Metalloid are the substance that show properties of both metals and non-metals. Thus, antimony will conduct electricity.

On the other hand, bismuth (Bi) is a metal hence, it will conduct electricity.

Thus, we can conclude that the order from least conductive to most conductive will be nitrogen (N), antimony (Sb), bismuth (Bi).

 

Answer: The correct answer is Option A.

Explanation:

Conductivity of an element is defined as the tendency to conduct electricity. This property is shown mostly by metals and then by some metalloids and least by non-metals.

Metals are defined as the elements which loose electrons easily and thus can easily conduct electricity due to the presence of free electrons.

Metalloids are defined as the elements which show the properties of both metals and non-metals. Some metalloids are conductive, some are not.

Non-metals are defined as the elements which gain electrons easily and thus cannot conduct electricity easily and are considered as non-conductive.

From the given options:

All the three elements belong to same group but nitrogen is a non-metal, antimony is a metalloid and Bismuth is a metal.

Thus, the order of conductivity follows:

\text{Nitrogen }<\text{Antimony }<\text{ Bismuth }

Hence, the correct answer is Option A.

Given the formula:The bond between which two atoms has the greatest degree of polarity?
A. C and C
B. C and O
C. H and C
D. H and O

Answers

The bond between hydrogen and oxygen has the greatest degree of polarity as there is wide electronegativity difference between the atoms.

What is an atom?

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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I would say D because oxygen is a highly electronegative atom and the OH b bonding is known to have high levels of polarity for example H-O-H in water.  This is why alcohols are miscible in water eventhough they are mostly non-polar.

The CH bond is more likely to be non-polar as it is with alot of hydrocarbons.  
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