Select the THREE answers that are correct concerning a saturated solution of PbCl2. PbCl2(s) Pb+2(aq) + 2Cl-(aq)

Answers

Answer 1

Answer:

Answer:

a b d

Explanation:

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An antacid tablet containing 0.50 g of NaHCO3 is dissolved in 250 mL of water. What is the molar concentration of NaHCO3 in the solution?

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c (speed of light) = v (frequency) x lambda (wavelength)

What is the number of pairs of electrons that are shared between the nitrogen atoms in a molecule of N2?(1) 1(2) 2(3) 3(4) 6

Answers

The answer is (3) 3. The sharing of electrons is important to help elements get 8 electrons in the outer shell to be stable. To achieve this aim, the nitrogen needs to share three pairs of electrons.

The number of pairs of electrons that are shared between nitrogen atoms in a molecule of ${{\text{N}}_{\text{2}}}$ is $\boxed{\left( 3 \right){\text{ 3}}}$ .

Further explanation:

Covalent Bond

It is a type of chemical bond where electrons are mutually shared between the bonded atoms. This bond is also known as a molecular bond. The compounds formed as a result of this bonding are covalent compounds.

Octet Rule

It is a thumb rule that describes the tendency of elements to bond with other elements in order to acquire eight valence electrons. As a result, elements tend to achieve stable noble gas configuration.

The atomic number of nitrogen is 7 and it has an electronic configuration of $1{s^2}2{s^2}2{p^3}$ . Nitrogen has five valence electrons in it and is three electrons short of the stable noble gas configuration of neon. So it can share three electrons with another nitrogen atom to complete its octet. As a result, three covalent bonds are formed between two nitrogen atoms. In other words, nitrogen atoms have a triple bond between them in molecule (For structure, refer to the attached image).

Learn more:

Identification of ionic bonding: brainly.com/question/1603987
Chemical bonds in NaCl: brainly.com/question/5008811

Answer details:

Grade: High School

Chapter: Ionic and covalent compounds

Subject: Chemistry

Keywords:covalent bonds, triple bond, nitrogen, 7, five, three, octet rule, covalent compound, molecular bond, electrons.

An unknown compound contains only carbon, hydrogen, and oxygen (CxHyOzCxHyOz). Combustion of 5.50 gg of this compound produced 8.07 gg of carbon dioxide and 3.30 gg of water. How many moles of carbon, C, were in the original sample? Express your answer to three significant figures and include the appropriate units.

Answers

Answer:

Moles of Carbon in the product = 0.183 mol

Explanation:

Complete combustion of an organic compound in the presence of excess oxygen will give carbon dioxide (CO2) and water vapour(H2O).

Equation of reaction

CxHyOz(s) + (2x + y/2 - z)/2 O2(g) --> x CO2(g) + y/2 H2O(l)

Moles of products

CO2

Molar mass of CO2 = 12 + (16*2)

= 44 g/mol

n(CO2) = 8.07/44.0

= 0.183 mol

One compound of CO2 has 1 Carbon atom and 2 Oxygen atom.

So if we have,

0.183 moles of carbon dioxide then

0.183 moles of carbon.

The mass of carbon in the product, m = 0.183*12

= 2.20 g

H2O:

Molar mass of H2O = (1*2) + 16

= 18 g/mol

Number of moles of H2O =

= 3.3/18

= 0.183 mol

One compound of H2O has 2 Hydrogen atom and 1 Oxygen atom.

0.183 moles of water then we also have

= 2*(0.183)

= 0.367 moles of hydrogen in the sample.

The mass of hydrogen in the compound, m

= 0.367*1

= 0.367 g

Adding these two values together will give us the mass of our compound that C and H;

2.2 + 0.367

= 2.567 g

So for the Oxygen,

5.5 g - 2.567

= 2.933 g

Moles of Oxygen;

Molar mass of O = 16 g/mol

= 2.933/16

= 0.183 mol

There are 0.030 moles of carbon in the original sample as per the mole concept.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is given by the formula,

$\rm{number \ of \ moles}=\frac{\rm{mass}}{molar \ mass}$

The given values are,mass= $5.50 \ g$

molar mass= $178g/mol$

Substitution of values in formula gives,

$\rm{number \ of \ moles}=(5.50)/(178)\n=0.030$

Thus, there are 0.030 moles of carbon in the original sample as per the mole concept.

Learn more about mole concept,here:

brainly.com/question/31123980

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In which solution will thymol blue indicator appear blue?(1) 0.1 M CH3COOH (3) 0.1 M HCl
(2) 0.1 M KOH (4) 0.1 M H2SO4

Answers

Answer: (2) 0.1 M KOH

Explanation:

Thymol blue is an universal indicator. Thymol blue has a blue color when in basic conditions (pH > 7), a green color in neutral conditions (pH =7), and a yellow color in acidic conditions (pH < 7).

pH or pOH is the measure of acidity or alkalinity of a solution. pH is calculated by taking negative logarithm of hydrogen ion concentration.

0.1 M $CH_3COOH$ , 0.1 M $HCl$ and 0.1 M $H_2SO4$ are all acidic in nature.

Thus thymol blue will appear blue in basic 0.1 M KOH.

In 0.1 M KOH, thymol blue indicator would appear blue.

Which one of the following equations is not balanced?6H2O + 6CO2 ---> C6H12O6 + 6O2
C7H16 + 11O2 ---> 7CO2 + 8H2O
PCl2 + 4H2O --->H3PO4 + 5HCL
Fe3O4 + 4H2 ---> 3Fe + 4H2O

Answers

The key inthe balancing of chemical reaction is to make sure that you got the exactchemical formula of the substance that is reacting and the yielded product.After getting the formula, identify first the hardest element/atom to bebalanced such as Na, Zn, Cl, C, O, etc. Then proceed to the easier ones such asO, H. Make sure to note the atoms present in the molecule of the substance. Amongthe three equations, PCl2 + 4H2O --->H3PO4 + 5HCL is not balanced. Thehardest element here is the Cl. Observe that there are 5Cls in the product sideso you must add 5 to the PCl2. However, there are only 2Cl atoms and it needs3 to balance the equation. Also, there is no P in the product side. This equationis invalid.

The third one is incorrectly balance because the are only two chlorine on the reactant side and five on the product side. The correct balanced equation is 2PCL2 + 8H2O -> 2H3PO4 + 5H2 + 4Cl. The reason HCl is broken into two parts is because it is a strong acid and would immediately dissolve if put together.

A sample of gas in a balloon has an initial temperature of 2.0 ∘C and a volume of 1.53×103 L . If the temperature changes to 99 ∘C , and there is no change of pressure or amount of gas, what is the new volume, V2, of the gas?

Answers

(V1/T1)=(V2/T2) this is Charles' law where T is in Kelvin
So: (1.53x10^3)/(275K) = V2/(372K)
V2= 2.07x10^3L

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