Adv. Chemistry-Semester 1 Review 2021

Front

What evidence supports the idea that electrons in atoms are arranged in distinct energy levels?

Back

The observation of line spectra from gas discharge tubes.

Front

Which of the following molecules is nonpolar? H2O, BF3, CH3Br, NF3, SO2

Back

BF3

Front

How many p electrons does Selenium (Se) have? (Atomic number 34)

Back

16

Front

Convert 2.360 moles of lead (II) oxide (PbO) into its corresponding mass in grams.

Back

526.8 g

Front

What is the electronegativity of Hydrogen (H) compared to Carbon (C)?

Back

About equal to that of C.

Front

Define electronegativity.

Back

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.

Front

What is the significance of line spectra in chemistry?

Back

Line spectra provide evidence for the quantized energy levels of electrons in atoms.

Front

What is the molecular geometry of BF3?

Back

Trigonal planar.

Front

How do you calculate the mass of a substance from moles?

Back

Mass (g) = Moles × Molar Mass (g/mol).

Front

What is the molar mass of lead (II) oxide (PbO)?

Back

207.2 g/mol (Pb) + 16.0 g/mol (O) = 223.2 g/mol.