Essay (1 Point) 1. Explain the difference between an ionic bond and a covalent b

Question

Essay (1 Point) 1. Explain the difference between an ionic bond and a covalent bond.

Essay (1 Point) 2. What kinds of elements form ionic compounds? What kinds of elements form molecular compounds?

Essay (1 Point) 3. Give the general form for naming ionic compounds.

Essay (1 Point) 4. Give the general form for naming molecular compounds

(1 Point) 5. Classify each compound as ionic or molecular

A. KCl

B. CO2

C. N2O

D. NaNO3

(1 Point) 6. Name Each Compound:

a) CaCl2

b) N2O

c) SO2

d) BCl3

(1 Point) 7. Calculate the formula mass for this compound NH4ClShow your work.

(1 Point) 8. Find the number of moles of oxygen in each of the following: Show your work.

a) 0.35 mol of N2O4

b) 2.26 mol of CO2

c) 1.55 mol of CO

d) 42.7 grams of H2O

9. Balance the chemical equation by putting the correct number (1,2,3 etc) in front of each compound:

__ PbO + ___NH3 ------> ___Pb + ___N2 + ___H2O

10. The US Food and Drug Administration recommends that you consume less than 2.4 grams of sodium per day. How much sodium chloride (salt) can you consume each day and still be within the FDA limit? Show your work.

Explanation / Answer

Essay (1 Point) 1. Explain the difference between an ionic bond and a covalent bond. Ionic bond as the name suggests is the bond formed by the transfer of ion i.e. electrons. It is formed between a metal ans non-metal. Usually, a metal looses an electron and a non-metal gains an electron to complete their valence shell. eg. NaCl is formed when Na donates an electron and Cl accepts one. Covalent Bond is formed by sharing of electrons between two non-metals. This is done to attain full outer energy level. This sharing allows the atoms to stay together. eg. CH4 (Methane) . Carbon has 4 covalent bonds with 1 hydrogen each. Essay (1 Point) 2. What kinds of elements form ionic compounds? What kinds of elements form molecular compounds? ionic compounds : Metals + Non-Metals (eg. KCl, MgSO4 ) molecular compounds : non-metals (eg. O2, N2 ) Essay (1 Point) 3. Give the general form for naming ionic compounds. Naming : Metal (Valency if variable) Essay (1 Point) 4. Give the general form for naming molecular compounds Naming: Metal (valency if variable ) Non-metal -ide eg: NaCl - Sodium Chloride FeCl2 - Iron(II)Chloride or Ferric Chloride (1 Point) 5. Classify each compound as ionic or molecular A. KCl - ionic B. CO2 - molecular C. N2O - molecular D. NaNO3 - ionic (1 Point) 6. Name Each Compound: a) CaCl2 - Calcium Chloride b) N2O - Nitrous Oxide c) SO2 - Sulphur Dioxide d) BCl3 - Boron trichloride (1 Point) 7. Calculate the formula mass for this compound NH4Cl Show your work. Mass of Nitrogen (N) = 14 g Mass of Hydrogen(H)= 1g Mass of Chlorine (Cl)= 35.5 g So, mass of NH4Cl =14 +1X4 +35.5 =53.5 g (1 Point) 8. Find the number of moles of oxygen in each of the following: Show your work. a) 0.35 mol of N2O4 Moles of o2 = 2*moles of N2O4 = 0.35*2 = 0.7 mol b) 2.26 mol of CO2 Moles of O2= 226 mol c) 1.55 mol of CO Moles of O2 = 1.55/2 = 0.77 mol d) 42.7 grams of H2O mol wt of H2O = 18g so moles of H2O= 42.7/18 =2.71 So, moles of O2 = 2.71/2 = 1.35 mol 9. Balance the chemical equation by putting the correct number (1,2,3 etc) in front of each compound: 3__ PbO + 2 ___NH3 ------> 3___Pb + 1___N2 + 3___H2O 10. The US Food and Drug Administration recommends that you consume less than 2.4 grams of sodium per day. How much sodium chloride (salt) can you consume each day and still be within the FDA limit? Show your work. Mass of Na =23g Mass of Cl= 35.5 g so 58.5 g NaCl has 23g Na 1 g Na in 58.5/23 g naCl 2.4 g Na in 58.5/23 *2.4 g Nacl So, 6.1g NaCl should be consumed at max.

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