Matter and Energy
When a quantity of electricity is converted to heat, the heat energy produced is measured in...
Calories
What is the total number of protons and neutrons in an atom of Se?
79
What is the total number of electrons in an Mg +2
ion?
10
Beryllium is classified as what in the Periodic Table?
An alkaline earth metal
What is the mass of 2.0 moles of nitrogen gas?
56g
In a closed system, as the temperature of a liquid increases, the vapor pressure of the liquid...
Increases
When an atom goes from the excited state to the ground state, the total energy of the atom...?
Decreases
The attraction between molecules of methane in the liquid state is primarily due to...?
Which group contains the most active metals?
Group 1
The approx. percent by mass of potassium in KHCO3 is...?
39%
What is the volume of 4.40 grams of CO2 at STP?
2.24 L
The total number of orbitals in the 4f sublevel is...?
7
Which type of bonding is found in a molecule of HBr?
Polar Covalent
The density of a gas is 3.00 g/L at STP. What is the gram molecular mass of the gas?
67.2g
When the vapor pressure of a liquid in an open container equals the atmospheric pressure, the liquid will...
Boil
The amount of energy required to remove the most loosely bound electron from an atom in the gaseous phase is called?
Ionization energy
Which type of bond exists between carbon atoms in a diamond?
Covalent
In Period 2, the number of elements that are gases at STP is...?
4
How many calories of heat are absorbed when 50g of water at 100 degrees C are completely vaporized?
27,000 calories
10 grams of oxygen gas is added to 10 grams of nitrogen gas. No energy change occurs.
Is this sample a mixture or a compound?
What percent of the mass does oxygen make up?
A mixture that is 50% oxygen by mass.
Which emission from a radioactive source is NOT affected by an electric field?
(Gamma, beta, alpha...)
gamma rays
A pure substance melts at 38 degrees C and does not conduct electricity in either the solid or liquid phase. The substance is classified as...?
(Ionic, metallic, electrovalent, molecular...)
Molecular
All of the elements in Period 3 have a total of 2 electrons in which sublevel?
2s sublevel
A solution in which an equilibrium exists between dissolved and undissolved solute must be...?
Saturated