Chemistry 1411 Examination 1

Which of the following groups represent the alkaline earth metals?

• Group B

• Group IA

• Group IIA

• Group IVA

An elemental ion has 47 protons, 46 electrons, and 61 neutrons. What isotope is it?

• Ag+

• Pd -

• Ag +

• Pd+

Which of the following equals 24.0 nm?

• 2.40 x 10 -8 m

• 2.40 x 10 -11 cm

• 2400 um

• 2.4 pm

A temperature of 63 oF is ----------- K.

• 290 K

• 304 K

• 17 K

• 326 K

The number 1.05 x 10 9 has how many significant figures?

• 2

• 3

• 4

• 9

30.79 g + 1.678 g + 854 g = ?

• 881 g

• 886.5 g

• 886 g

• 889g

The correct formula for Tin (II) carbonate is:

• TiCO3

• SnCO3

• Ti2CO3

• Sn(CO3)2

What is the number of moles of ammonium chloride in 32.0 g of ammonium chloride, NH4Cl?

• 3.15 x 10 23

• 0.598

• 4.33 x 10 22

• 1.89 x 10 24

Which one of the following represents the oxide ion?

• OH-

• O2-

• O-

• O22-

What is the number of oxygen atoms in 54.68 g of sodium sulfate, Na2SO4 ? ( Avogadro's number = 6.02 x 10 23 )

• 1.244 x 10 23 O atoms

• 4.976 x 10 23 O atoms

• 2.195 x 10 24 O atoms

• 9.273 x 10 23 O atoms