Chemistry291

Answer: NaCl is an ionic compound. Explanation: NaCl is composed of two elements.The first element is sodium.Sodium is a metal.The second element is the chlorine.Chlorine is a nonmetal. We know that metals release its valence electrons to follow the octet rule.On the other hand,nonmetals receive electrons to  to follow the octet rule. Here to form NaCl compound, the metal sodium has released one electron and the nonmetal chlorine has received one electron. Na------>Na+ + e Cl +e --------> Cl- So,ionic bond exists between sodium ion and chloride ion.The sodium ion is called cation and the chloride ion is called anion. Summary: In NaCl, the position of Na is in the left side of the periodic table(Group 1A),so Na is a metal. And the position of the Cl is the right side of the periodic table(Group 7A),so Cl is a nonmetal.Therefore,ionic bond exists between Na and Cl and NaCl is a ionic compound.

The NH3 compound name is ammonia or nitrogen trihydride.Actually,the common name of NH3 is ammonia and the systematic or IUPAC name for NH3 is nitrogen  trihydride . Also,the IUPAC name of NH3 is ammonia.The IUPAC has recognized the common name of NH3 as systematic name. Explanation: In NH3 compound,both nitrogen and hydrogen are nonmetals,so to name NH3 compound we will apply the rules for binary compounds with two non metals. Rules:  1. Firstly,write the name for the first element using a prefix if there is more than one atom.   2. Then,write the stem of the second element and add the suffix -ide. Use a prefix to indicate the number of atoms for the second element. ●Remember that two nonmetals form a covalent compound.  ●Notice that The name of the second element retains the -ide ending as though it were an anion. Now for NH3 compound,we get nitrogen trihydride.

  NaCO3 Compound Name Answer: The name of the compound NaCO3 is sodium carbonate. Explanation: The NaCO3 compound has two ions which are Na+ and CO₃²- . CO₃²-   is a polyatomic ion. To name  NaCO3 compound,at first write the name of sodium ion,then write the name of carbonate ion. NaCO3 =Sodium carbonate 【 Rules: 1)Write the name of the cation 2)Write the name of the anion】 This is an ionic compound. Next

  P2O5 Compound Name Answer: The IUPAC or systematic name for the compound P2O5 is phosphorus (V) oxide.Here the roman numeral  (V) indicates the oxidation number of phosphorus that is +5. Here is the alternative name of P2O5.P2O5 is called diphosphorus pentoxide.Sometimes,we leave the prefix di- and we call P2O5 as phosphorus pentoxide. Look, Penta + Oxide ---a-->Pentoxide. So, we  are getting three name for P2O5 compound.These are: ● P hosphorus pentoxide ●Di phosphorus pentoxide ●P hosphorus (V) oxide

1)HCHO 2)CH3CHO 3)CH3CH2CHO 4)CH3COCH3 5)CH3COOH 6)P2O5 Solution: 1)The IUPAC name for the compound HCHO is methanal. 2)The IUPAC name for the compound CH3-CHO is ethanal. 3) The IUPAC name for the compound CH3-CH2-CHO is propanal. 4) The IUPAC name for the compound CH3-CO-CH3 is propanone. 5) The IUPAC name for the compound CH3COOH is ethanoic acid . 6) The IUPAC name for the compound P2O5 is phosphorus (V)oxide. ●What is the IUPAC name for the following compound? 1)CH3OH 2)CH3-CH3 3)CuCl2 Solution: 1) The IUPAC name for the compound CH3OH is methanol. 2) The IUPAC name for the compound CH3-CH3 is ethane. 3) The IUPAC name for the compound CuCl2  is copper (II) chloride.

Write the formula for the polyatomic ion in NH4Cl Answer: The  formula for the polyatomic ion in NH4Cl is  NH  4   + . Explanation: The  chemical formula for ammonium chloride is  NH₄Cl.In this compound ( NH₄Cl),we get ammonium ion  NH  4   + and chloride ion Cl -  . The charge on the polyatomic ion in  NH₄Cl  is 1+ and the charge on the anion in  NH₄Cl is 1-.

What is the charge on the polyatomic ion in sodium carbonate? Answer: The charge on the polyatomic ion in sodium carbonate is 2-. Explanation: The chemical formula for sodium carbonate is Na₂CO₃.Here the charge of cation sodium is 1+ and the charge on the polyatomic ion CO₃²- is 2-.T he polyatomic ion CO₃²- is called carbonate ion. ●Some Questions and Answers ● Does sodium carbonate contain a polyatomic ion? Answer: Yes,sodium carbonate contain a polyatomic ion which is called carbonate ion.The formula for carbonate ion is CO₃²-. ● What is the charge of sodium carbonate? Answer: The  net charge of sodium carbonate compound is zero. ● What is the ion of sodium carbonate? Answer: Na¹+ and CO₃²- are  the ions of sodium carbonate.

Answer: From     the electron configuration of 1s22s22p63s23p5,we can see that this atom has 17 electrons.We know that in a neutral atom the number of electrons is equal to the number of protons.So this atom has 17 protons which indicates that this atom is chlorine whose atomic number is 17. From   the electron configuration of the atom 1s22s22p63s23p5,we also see that its outermost shell is the third shell( 3s23p5) and it has 7 valence electrons. To draw the electron dot symbol or Lewis dot symbol of this atom,we need to only consider the valence electrons. More Knowledge

3/4 Divided by 1/8 Solution: 3/4 divided by 1/8 =3/4 ÷ 1/8 (Translating) =3/4 × 8/1(Change of division sign and multiplied by the reciprocal fraction) =(3×8)/(4×1) [Multiply top to top and bottom to bottom numbers) Now reduce by canceling the common factor =(3×4×2)/(2×2×1) =(3×4)/(2×1)  = (3×2×2)/(2×1) =(3×2)/1 =6 The answer for 3/4 divided by 1/8   is 6.

  3/4 Divided by 1/4 Solution: 3/4 divided by 1/4 =3/4 ÷ 1/4 (Translating) =3/4 × 4/1(Change of division sign and multiplied by the reciprocal fraction) =(3×4)/(4×1) [Multiply top to top and bottom to bottom numbers) Now reduce by canceling the common factor =(3×4)/(4×1)  =3/1 =3 The answer for 3/4 divided by 1/4   is 3.

  Electronic Configuration of Fe is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶. The Order of Electron Removal in the Formation of Fe³⁺ is Solution: Given, Fe(26)= 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶ Fe³⁺ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s 3d⁵ The order of electron removal in the formation of Fe³⁺ is that we need to first remove two electrons from 4S as the principal quantum number ,n, has the highest value which is 4.After that,we need to remove one electron from 3d .This is because n+l value is higher for 3d than others.

  3/4 Divided by 2/5 Solution: 3/4 divided by 2/5 =3/4 ÷ 2/5 (Translating) =3/4 × 5/2(Change of division sign and multiplied by the reciprocal fraction) =(3×5)/(4×2) [Multiply top to top and bottom to bottom numbers) =15/8 The answer for 3/4 divided by 2/5   is 15/8.But this is a improper fraction,so we need to change this improper fraction to a mixed number.If we change 15/8 as mixed number ,we get 1 7/8.

  3/4 Divided by 1/2 Solution: 3/4 divided by 1/2 =3/4 ÷ 1/2 (Translating) =3/4 × 2/1(Change of division sign and multiplied by the reciprocal fraction) =(3×2)/(4×1) [Multiply top to top and bottom to bottom numbers) =6/4 =(3×2)/(2×2)  (Reducing) (Cancel 2 from both sides) =3/2 The answer for 3/4 divided by 1/2   is 3/2.But this is a improper fraction,so we need to change this improper fraction to a mixed number.If we change 3/2 as mixed number ,we get 1 1/2.

  3/4 Divided by 3 Solution: 3/4 divided by 3 =3/4 ÷ 3 (Translating) = 3/4 ÷ 3/1 (Whole number to fraction) =3/4 × 1/3(Change of division sign and multiplied by the reciprocal fraction) =(3×1)/(4×3) [Multiply top to top and bottom to bottom numbers) =1/4 (Reducing) (Cancel 3 from both sides) The answer for 3/4 divided by 3  is 1/4.

  3/4 Divided by 2 Solution: 3/4 divided by 2 =3/4 ÷ 2 (Translating) = 3/4 ÷ 2/1 (Whole number to fraction) =3/4 × 1/2(Change of division sign and multiplied by the reciprocal fraction) =(3×1)/(4×2) [Multiply top to top and bottom to bottom numbers) =3/8 The answer for 3/4 divided by 2  is 3/8.

3 Divided by 1/4 Solution: 3 divided by 1/4 =3 ÷ 1/4 (Translating) = 3/1 ÷ 1/4 (Whole number to fraction) =3/1 × 4/1(Change of division sign and multiplied by the reciprocal fraction) =(3×4)/(1×1) [Multiply top to top and bottom to bottom numbers) =12/1 =12 The answer for 3 divided by 1/4 is 12.

3 Divided by 1/8 Solution: 3 divided by 1/8 =3 ÷ 1/8 (Translating) = 3/1 ÷ 1/8 (Whole number to fraction) =3/1 × 8/1(Change of division sign and multiplied by the reciprocal fraction) =(3×8)/(1×1) [Multiply top to top and bottom to bottom numbers) =24/1 =24 The answer for 3 divided by 1/8 is 24.

3 Divided by 1/6 Solution: 3 divided by 1/6 =3 ÷ 1/6 (Translating) = 3/1 ÷ 1/6 (Whole number to fraction) =3/1 × 6/1(Change of division sign and multiplied by the reciprocal fraction) =(3×6)/(1×1) [Multiply top to top and bottom to bottom numbers) =18/1 =18 The answer for 3 divided by 1/6 is 18.

  3 Divided by 1/5 Solution: 3 divided by 1/5 =3 ÷ 1/5 (Translating) = 3/1 ÷ 1/5 (Whole number to fraction) =3/1 × 5/1(Change of division sign and multiplied by the reciprocal fraction) =(3×5)/(1×1) [Multiply top to top and bottom to bottom numbers) =15/1 =15 The answer for 3 divided by 1/5 is 15.

3 Divided by 1/2 Solution: 3 divided by 1/2 =3 ÷ 1/2 (Translating) = 3/1 ÷ 1/2 (Whole number to fraction) =3/1 × 2/1(Change of division sign and multiplied by the reciprocal fraction) =(3×2)/(1×1) [Multiply top to top and bottom to bottom numbers) =6/1 The answer for 3 divided by 1/2 is 6.

  3 Divided by 1/3 Solution: 3 divided by 1/3 =3 ÷ 1/3 (Translating) = 3/1 ÷ 1/3 (Whole number to fraction) =3/1 × 3/1(Change of division sign and multiplied by the reciprocal fraction) =(3×3)/(1×1) [Multiply top to top and bottom to bottom numbers) =9/2 =9 The answer for 3 divided by 1/3 is 9.

  2/3 Times 12 in Fraction Form Solution:            2/3 Times 12                  Step-1: Times means "×" sign =2/3 × 12 Now express 12 as a fraction considering 1 as a denominator. =2/3 × 12/1                   Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×12)/(3×1)                  Step-3: Now simplify the new fraction by canceling the common factors if needed. =(2×12)/(3×1) =(2×3×4)/(3×1) =(2×4)/1 =6/1 =6 So,2/3 times 12   is 6.(Answer)

3/4 Times 3/4 Times 3/4 in fraction Form Solution: 3/4 Times 3/4 Times 3/4                 Step-1: Times means "×" sign =3/4 × 3/4 × 3/4                  Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(3×3×3)/(4×4×4)                 Step-3: Now simplify the new fraction by canceling the common factors if needed. =(3×3×3)/(4×4×4) =27/64 As there is no common factor of 26 and 64 , So,3/4 times 3/4 times 3/4 as a fraction is 27/64.

  3/10 Times 2/3 in fraction Form Solution:            3/10 Times 2/3                  Step-1: Times means "×" sign =3/10 × 2/3                   Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(3×2)/(10×3)                  Step-3: Now simplify the new fraction by canceling the common factors if needed. =(3×2)/(10×3) =2/10 =2/(5×2) =1/5 As there is no common factor of 1 and 5 , So,3/10 times 2/3 as a fraction is  1/5.

  2/3 Times 10 in fraction Form Solution:            2/3 Times 10                 Step-1: Times means "×" sign =2/3 × 10 Now express 10 as a fraction considering 1 as a denominator. =2/3 × 10/1                   Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×10)/(3×1)                  Step-3: Now simplify the new fraction by canceling the common factors if needed. =(2×10)/(3×1) =20/3 As there is no common factor of 20 and 3 , So,2/3 times 10 as a fraction is  20/3. But as this is an improper fraction,we need to change it as a mixed fraction. So,2/3 times 10   is 6 2/3.(Answer) So,2/3 times 10   is 6 2/3.(Answer)

2/3 Times 1 in Fraction Form Solution:                   Step-1:                      2/3 Times 1 Times means "×" sign =2/3 × 1 Now express 1 as a fraction considering 1 as a denominator. =2/3 × 1/1                  Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×1)/(3×1)                 Step-3: Now simplify the new fraction by canceling the common factors if needed. =(2×1)/(3×1) =2/3 As there is no common factor of 2 and 3 , So,2/3 times 1 as a fraction is 2/3. So,2/3 times 1 is 2/3.(Answer)

  2/3 Times 9 in fraction Form Solution:            2/3 Times 9              Step-1: Times means "×" sign =2/3 × 9 Now express 9 as a fraction considering 1 as a denominator. =2/3 × 9/1                   Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×9)/(3×1)                  Step-3: Now simplify the new fraction by canceling the common factors if needed. =(2×9)/(3×1) =(2×3×3)/(3×1) =(2×3)/1 =6/1 =6 As there is no common factor of 6 and 1 , So,2/3 times 9 as a fraction is 6. So,2/3 times 9   is 6.(Answer)

  2/3 Times 8 in fraction Form Solution:            2/3 Times 8              Step-1: Times means "×" sign =2/3 × 8 Now express 8 as a fraction considering 1 as a denominator. =2/3 × 8/1                   Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×8)/(3×1)                  Step-3: Now simplify the new fraction by canceling the common factors if needed. =(2×8)/(3×1) =16/3 As there is no common factor of 16 and 3 , So,2/3 times 8 as a fraction is  16/3. But as this is an improper fraction,we need to change it as a mixed fraction. So,2/3 times 8   is 5 1/3.(Answer)

   2/3 Times 7 in fraction Form Solution: 2/3 Times 7              Step-1: Times means "×" sign =2/3 × 7 Now express 7 as a fraction considering 1 as a denominator. =2/3 × 7/1                   Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×7)/(3×1)                 Step-3: Now simplify the new fraction by canceling the common factors if needed. =(2×7)/(3×1) =14/3 As there is no common factor of 14 and 3 , So,2/3 times 7 as a fraction is  14/3. But as this is an improper fraction,we need to change it as a mixed fraction.4 2/3 is the answer So,2/3 times 7   is 4 2/3.(Answer)

  2/3 Times 6 in fraction Form Solution: 2/3 Times 6 Step-1:Times means "×" sign =2/3 × 6 Now express 6 as a fraction considering 1 as a denominator. =2/3 × 6/1 Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×6)/(3×1) Step-3: Now simplify the new fraction by canceling the common factors if needed. =(2×6)/(3×1) =(2×3×2)/(3×1) =(2×2)/1 =4/1 =4 So,2/3 times 6   is 4.(Answer)

2/3 Times 3 in fraction Form Solution: 2/3 Times 3 Step-1:Times means "×" sign =2/3 × 3 Now express 3 as a fraction considering 1 as a denominator. =2/3 × 3/1 Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×3)/(3×1) Step-3: Now simplify the new fraction by canceling the common factors if needed. =(2×3)/(3×1) =2/1 =2 So,2/3 times 3  is 2.(Answer)

  2/3 Times 4 in fraction   Form Answer: 2/3 Times 4 Step-1:Times means "×" sign =2/3 × 4 Now express 4 as a fraction considering 1 as a denominator. =2/3 × 4/1 Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×4)/(3×1) =8/3 Step-3: Now simplify the new fraction by canceling the common factors if needed. =8/3 As there is no common factor of 8 and 3 , So,2/3 times 4 as a fraction is  8/3. But as this is an improper fraction,we need to change it as a mixed fraction.2 2/3 is the answer.

   2/3 Times 1/2 in fraction   Form Answer: 2/3 Times 1/2 Step-1:Times means "×" sign =2/3 × 1/2 Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×1)/(3×2) Step-3: Now simplify the new fraction by canceling the common factors if needed. =(2×1)/(3×2) =1/3 As there is no common factor of 1 and 3 , So,2/3 times 1/2 as a fraction is  1/3.

  2/3 Times 1/5 in fraction   Form Answer: 2/3 Times 1/5 Step-1:Times means "×" sign =2/3 × 1/5 Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×1)/(3×5) =2/15 Step-3: Now simplify the new fraction by canceling the common factors if needed. =2/15 As there is no common factor of 2 and 15 , So,2/3 times 1/5 as a fraction is  2/15.

  2/3 Times 1/4 in fraction   Form Answer: 2/3 Times 1/4 Step-1:Times means "×" sign =2/3 × 1/4  Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×1)/(3×4) =2/12 Step-3: Now simplify the new fraction by canceling the common factors if needed. =2/12 =2/(6×2) =1/6 As there is no common factor of 1 and 6 , So,2/3 times 1/4 as a fraction is  1/6.

  2/3 Times 2/5 in fraction   Form Answer: 2/3 Times 2/5 Step-1:Times means "×" sign =2/3 × 2/5  Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(2×2)/(3×5) =4/15 Step-3: Now simplify the new fraction by canceling the common factors if needed. =4/15 As there is no common factor of 4 and 15 , So,2/3 times 2/5 as a fraction is  4/15.

1/3 Times 2/3 in fraction Form Solution: 1/3 Times 2/3 Step-1:Times means "×" sign =1/3 × 2/3 Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(1×2)/(3×3) =2/9 Step-3: Now simplify the new fraction by canceling the common factors if needed. =2/9 As there is no common factor of 2 and 9 , So,2/9 times 2/3 as a fraction is 2/9.

  3/4 × 1/2 × 1/2 in Fraction Solution: 3/4 times 1/2 times 1/2 Step-1:Times means "×" sign 3/4 × 1/2 × 1/2 Step-2: ●Multiply all top numbers.The obtained number will be the numerator of the new fraction. ●Multiply all bottom numbers.The obtained number will be the denominator of the new fraction. =(3×1×1)/(4×2×2) Step-3: Now simplify the new fraction by canceling the common factors if needed. =3/16 There is no common factor of 3 and16 ,so 3/16 is the answer.