General Chemistry Answers

i. Define the term ‘electronegativity.’

ii. Explain how the concept of electronegativity relates to bond polarity.

i. State THREE (3) properties of covalent compounds.

ii. Draw the Lewis structure for the molecule of ammonia (NH₃).

iii. State the geometry of, and the bond angles in, the ammonia (NH₃) molecule.

iv. PH3 has the same geometry as NH3, however, the bond angle in PH3 is less than that in NH₃. Provide an explanation for this observation. 

Differentiate between the following types of bonds, using an illustration in each case to assist in your answer.

i. Metallic bonding

ii. Hydrogen bonding

iii. Ionic bonding

What is the molar concentration of 1.29 mol of KCl dissolved in 350. mL of solution?

the different methods used to measure soil pH and how they compare to each other

All elements have radioactive isotopes that occur naturally in nature.

When 40 cm³ of solution containing 1 mol of HCl is mixed with 10 cm³ of solution containing 1 mol of NaOH, the temperature rise is t^oC. What is the temperature rise when 20 cm³ of a solution containing 2 mol of NaOH?

Which of the following concentration of ions will form precipitate?

Li₂CO₃(s)  ⇌ 2Li⁺(aq) + CO₃²⁻(aq)        K_sp = 2.5 × 10⁻²

1.    For each segment (i.e. A, B, C) on the graph shown below, calculate the lapse rate of the atmosphere and indicate if the atmosphere is stable or unstable for wet air parcels.

1.    Determine the atmospheric stability for each of the following temperature profiles. Show all work and explain choices.

a.        Z, m   T, 8C

2.00   5.00

50.00 4.52

b.        Z, m   T, 8C

2.00   5.00

50.00 5.00

c.        Z, m   T, 8C

2.0     -21.01

50.0   -25.17