Chemistry Final Exam Review Modern Chemistry

A compound is _________. a homogeneous substance made of two or more elements chemically combined made of two or more elements physically combined both the first and second choices

The molar mass of an element is _________. the mass of protons only the atomic number, in grams the pass of the protons and neutrons the mass of one mole of that element

An isotope is ________. atoms with the same number of protons and neutrons an element with a charge atoms of the same element that have different number of neutrons none of the above

An atom with a + charge is called a(n) _________ anion cation dogion muon

Valence electrons are ______. electrons closest to the nucleus only found in isotopes only found in the d and f orbitals are significant in determining how atoms form bonds

An atom with 9 protons, 9 neutrons, and 10 electrons is ____ an isotope a neon atom a fluorine ion a fluorine atom

What is the total number of moles of sulfur atoms in 1 mole of Fe2(SO4)3? 12 2

What is the correct formula for sodium nitrate? NaNO2 Na(NO3)2 Na(NO)3 NaNO3

What is the correct formula for ammounium sulfate? (NH4)2SO4 NH4(SO4)2 NH4SO4 (NH4)2(SO4)2

Name the compound NH4Cl. ammonium chlorate nitrate chloride ammonium chloride nitrogen hydroxide chloride

When the pressure of a gas is increased, the volume _____. stays the same increases decreases explodes

What are the units of STP? 0°C and 1 atm

At 120°C, the pressure of a sample of nitrogen gas is 1. 20 atm At 120°C, the pressure of a sample of nitrogen gas is 1.20 atm. What will the pressure be at 200°C, assuming constant volume? 1.44 kPa 1.44 atm 14.4 atm 0.72 atm

The volume of gas at 25°C and 0. 100 atm is 600. 0 mL The volume of gas at 25°C and 0.100 atm is 600.0 mL. What volume will the same gas sample occupy at STP? 5.5 mL 5.5 L 55.0 mL 550 mL

A weather balloon with a volume of 1 A weather balloon with a volume of 1.5 L is released from the earth’s surface where the pressure is 1 atm. What volume will the balloon occupy at an altitude of 20.0 km, where the air pressure is 0.2 atm? Assume a constant temperature. 75 L 7.5 L 7.5 atm 0.75 atm

A gas has a pressure of 1. 26 atm and occupies a volume of 7. 40 L A gas has a pressure of 1.26 atm and occupies a volume of 7.40 L. If the gas is compressed to a volume of 2.93 L, what will its pressure be, assuming constant temperature? 31 atm 17.2 atm 3.18 atm 5.87 atm

The volume of a gas at 27. 0°C and 0. 200 atm is 80. 0 mL The volume of a gas at 27.0°C and 0.200 atm is 80.0 mL. What volume will the same gas sample occupy at standard temperature and pressure? 14.56 mL 1.46 mL 0.05 mL 204.75 mL

The volume of a gas is 30. 0 mL at 27. 0°C and 1. 0 atm The volume of a gas is 30.0 mL at 27.0°C and 1.0 atm. What will the volume be at 10.0°C and 0.5 atm? 67.92 mL 6.8 mL 22.22 mL 2.22 mL

Find the formula masses of the following compounds: H2O 18 g/mol   NaCl 58.45 g/mol H2SO4  98.1 g/mol Al2(SO4)3 342.26 g/mol    Pb(NO3)2 331.2 g/mol

What is the number of atoms or molecules in 1 mole of anything? 6.02 x 1023 This is known as Avogadro’s Number!!!!

What is the volume of 1 mole of any gas at STP? This is known as the molar volume and can be used for ANY gas as long as it is at STP.

Go to mole problems on review sheet.