Quiz 1 - Periodic Table & Atomic Mass | The Periodic Table and Atomic Mass

General Chemistry 1 - Quiz 1 - Periodic Table & Atomic Mass

1

What is the second period in the periodic table?

2

Which of the following is not an element of the main group?

Main groups: the 2 groups at the extreme left and the 6 groups at the extreme right of the periodic table. Manganese (Mn) is in group 7 ⇒ it is a transition metal

3

Which of the following statements is incorrect?

4

How many atoms of hydrogen do you have in 2.0 moles of H2?

n = NNA   ⇒   number of dihydrogen atoms NH2 = nH2 x NA = 2.0 x 6.022 x 1023 atoms

⇒ number of hydrogen atoms NH = 2 x NH2

5

What is the SI unit of molar mass?

The SI unit of molar mass M is g.mol-1

6

What is the mole number of 12.4 g of MgCl2 (MMg = 24.3 g.mol-1, MCl = 35.5 g.mol-1)?

mole number nMgCl2 = mMgCl2MMgCl2


with MMgCl2 = MMg + 2 x MCl = 95.3 g.mol-1

7

Which of the following statements about metals is incorrect?

Metals are typically not brittle; they are malleable (can be hammered into thin sheets) and ductile (can be drawn into wires).

8

Which element has the highest atomic mass?

Among the given options, uranium has the highest atomic mass, with an atomic mass of approximately 238.03 amu.

9

Which group in the periodic table contains the alkali metals?

Alkali metals are found in Group 1 of the periodic table and include elements such as lithium, sodium, and potassium.

10

How many atoms are present in 2 moles of carbon dioxide (CO2)?

One mole of CO2 contains 3 atoms (1 carbon and 2 oxygen). Therefore, 2 moles of CO2 contain 2 × 3 × 6.022 × 1023 = 3.613 × 1024 atoms.