Atomic Theory
What does the atomic number represent in an element?
the number of protons
Which subatomic particles are found in the nucleus of an atom?
neutrons and protons
What are the units for concentration?
M or mol/L
What term is associated with the part of a solution that is present in the smallest amount?
Solute
What is the definition of electronegativity?
the measurement of how much a species attracts electrons
The atomic number of sulfur is 16. How many electrons does a neutral atom of sulfur contain?
16 electrons.
Write the correct dissociation of potassium phosphate
K3PO4 (aq) → 3 K + (aq) + PO43 -(aq)
Which of the following expressions best describes the term net ionic equation?
a. an equation where all reactants and products are ions
b. an equation listing all ions that are not spectator ions
c. an equation where soluble substances are written in dissociated form d. an equation where only products are written in dissociated form
What is the atomic radii trend?
Decrease from left to right across a period. Increase from top to bottom in a group.
Which of the following elements has the smallest ionization energy: Mg, Si, Cl?
Mg
A 25.0mL solution of 0.900M HCl is diluted to a final volume of 55.0mL. What is the new concentration?
0.409M
When added to an iron (III) iodide solution, which of the following compounds will create a precipitate?
cesium nitrate
hydrochloric acid
copper (II) sulphate
ammonium hydroxide
4
What does the term isoelectronic mean?
having the same electron configuration
Which of the following atoms has the largest atomic radius: Ba, Pb, At?
Ba
Find the molar concentration of 3.12g of CuF2 in 150.0mL of solution
0.205M
What can be added to a solution containing ions to precipitate the ions from the solution?
a. lithium chloride
b. potassium hydroxide
c. sodium acetate
d. Two of the above are correct
D
24.1% of all the isotopes of an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average mass of the element?
74.92 amu
An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?
10.812 amu, Boron
If 85.0mL of 0.340 M K2CO3 is added to 35.0mL of 0.750 M Li2CO3, what is the molar concentration of the CO3 ion
0.463M
Name three factors that affect solubility and explain how they work
-Size
-polarity
-Temperature
-pressure
-density?