Unit 1: Atomic Structure and Properties

Looking at the following Mass Spectra and molecular ion, what element is possibly found in this compound??

• Cl

• N

• Br

• S

Which species would get deflected by the greatest degree in the mass spectrometer?

• ¹²C⁺
• ¹³C⁺
• ¹³C²⁺
• ¹⁴C⁺

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-5

What do the peaks on the mass spectrum represent?

• anions
• different isotopes
• atoms with differing numbers of electrons
• numbers of electrons

Tags

NGSS.HS-PS1-8

What do the heights of the peaks represent in the mass spectrum?

• number of isotopes
• relative abundance of each isotope
• average atomic mass
• charge:mass ratio

Find the molar mass of C₈H₁₈.

• 114.28 g/mol
• 26.00 g/mol
• 66.18 g/mol
• 338.52 g/mol

How many representative particles are found in 1.23 mol of Polonium. 

• 2.41x10²⁴
• 7.53x10²³
• 6.02x10²³
• 1.20x10²⁴

How many moles are in 1.00x10²⁵ Ni²⁺ ions?

• 1.661 mol
• 16.61 mol
• 0.1661 mol
• 166.1 mol

Tags

NGSS.HS-PS1-7

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements

• SO
• SO₂
• SO₃
• SO₄

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

• C₂H₅
• C₄H₁₀
• C₁H_2.5
• C₄H₈

Which of the following is the correct empirical formula for C₄H₁₀

• C₂H₅
• CH_2.5
• C₈H₂₀
• C₄H₁₀