Learning Catalytics - Ch 2 and 3

Questions from chapter 2 and 3

Titanium (Ti) has an atomic number of 22. How many protons, neutrons, and electrons are in an isotope of titanium with mass number of 48?

p = 22, n = 26, e = 22

An atom of oxygen (O) has an atomic number of 8. How many electrons are in the first, second, and third electron shells, respectively?

2, 6, 0

An atom of phosphorous (P) has an atomic number of 15. How many electrons are in the first, second, and third electron shells, respectively?

2, 8, 5

What do elements with atomic numbers 6, 14, and 22 have in common?

Same number of valence electrons and will form the same number of covalent bonds

An atom of oxygen (O) has an atomic number of 8. How many valence electrons does it have?

6

An atom of oxygen (O) has an atomic number of 8. What is its valence?

2

An atom of oxygen (O) has an atomic number of 8. How many covalent bonds can it form?

2

An atom of berylium (Be) has an atomic number of 4. How many covalent bonds can it form?

2

Based on the periodic table shown here, which elements will most likely form a nonpolar covalent bond?

H and H

Based on the periodic table shown here, which elements will most likely form an ionic bond?

Na and Cl & Li and F

Water shows high cohesion and surface tension and can absorb large amounts of heat because of large numbers of which type of bonds between water molecules?

Hydrogen bonds

The molecular mass of Sucrose (C₁₂H₂₂O₁₁) is:

342

How many grams of NaCl would you need to make 1 liter of a 1 molar solution?

56

How many grams of glucose (C₆H₁₂O₆) would you need to make 1 liter of a 0.25 M glucose solution?

45

Based on the dissociation patterns below, which of the following is an acid?

HCl

Solve for X. Log₂8 = X

3

What is the concentration of hydroxide ions in a solution where pH = 10?

1 × 10^–4 M​

Compared to an acidic solution at pH 5, a basic solution at pH 8 has

1,000 times fewer hydrogen ions