CHEM 1010 Homework 2
Predict the chemical formula for the ionic compound formed by NH₄⁺ and PO₄³⁻
(NH₄)₃PO₄
Determine the number of protons (p) and electrons (e) in N³⁻.
7 p, 10 e
Write the chemical formula for aluminum fluoride
AlF₃
Predict the chemical formula for the ionic compound formed by the elements Al and I
AlI₃
Determine the correct formula for aluminum oxide.
Al₂O₃
Write the chemical formula for barium nitride
Ba₃N₂
Write the chemical formula for carbon tetrafluoride
CF₄
Write the empirical formula corresponding to adenine, C₅H₅N₅.
CHN
Write the chemical formula for the carbonate ion
CO₃²⁻
Write the chemical formula for calcium sulfate dihydrate
CaSO₄•2H₂O
Predict the chemical formula for the ionic compound formed by Cu²⁺ and P³⁻
Cu₃P₂
Cathode rays are composed of what fundamental particle?
Electrons
Which scientist developed the nuclear model of the atom?
Ernest Rutherford
Columns on the periodic table are known as
Groups
Write the chemical formula for hydrobromic acid
HBr
Classify the following compounds as ionic or covalent: KCl, CrCl₃, Cl₂O.
Ionic, ionic, covalent.
Predict the chemical formula for the ionic compound formed by the elements K and S
K₂S
Which of the following is most likely to form a +2 ion?
Mg
Write the chemical formula for the ammonium ion
NH₄⁺
The nucleus of an atom contains:
Protons and neutrons
Which scientist determined the charge of the electron?
Robert Millikan
Of the following compounds, which contains a metalloid?
SiF₄
Which of the following represents a species with 16 protons and 18 electrons?
S²⁻
Consider two compounds. Compound A contains 15.7 g of sulfur and 18.6 g of fluorine. Compound B contains 25.4 g of sulfur and 60.2 g of fluorine. a. What is the mass ratio of fluorine to sulfur in Compound A? b. What is the mass ratio of fluorine to sulfur in Compound B? c. For Compound A, the ratio of fluorine to sulfur is 1.18. For Compound B, the ratio of fluorine to sulfur is 2.37. Using the Law of Definite Proportions (also called the Law of Constant Composition), could Compound A and Compound B be the same compound?
a. 18.6/15.7 = 1.18 b. 60.2/25.4 = 2.37 c. No, because they have different ratios of the same elements.
Provide the correct IUPAC name for Al(IO₃)₃.
aluminum iodate
Provide the correct IUPAC name for AlPO₄?
aluminum phosphate
Provide the correct IUPAC name for Ba(OH)₂.
barium hydroxide
Provide the correct IUPAC name for BaS.
barium sulfide
Provide the correct IUPAC name for BrCl₃.
bromine trichloride
Provide the correct IUPAC name for Ca(C₂H₃O₂)₂.
calcium acetate
Provide the correct IUPAC name for CaCO₃.
calcium carbonate
Provide the correct IUPAC name for CaCl₂ · 2H₂O.
calcium chloride dihydrate
Provide the correct IUPAC name for Ca(NO₃)₂?
calcium nitrate
Provide the correct IUPAC name for N₂O₄.
dinitrogen tetroxide
Provide the correct IUPAC name for HCN(aq).
hydrocyanic acid
Provide the correct IUPAC name for LiCl.
lithium chloride
Provide the correct IUPAC name for Mg₃P₂.
magnesium phosphide
Carbon dioxide is a _____ compound composed two types of _____ atoms.
molecular; nonmetal
Provide the correct IUPAC name for HNO₂(aq).
nitrous acid
Provide the correct IUPAC name for K₂SO₄?
potassium sulfate
An unknown element X has the following isotopes: ²⁵X (80.50% abundant, mass = 25.03 amu) and ²⁷X (19.50% abundant, mass = 26.98 amu). What is the average atomic mass of X in amu?
(0.8050 * 25.03) + (0.1950 * 26.98) = (20.15) + (5.261) = 25.41 amu
Determine the number of protons (p) and electrons (e) in Mg²⁺.
12 p, 10 e
There are two naturally occurring isotopes of europium, ¹⁵¹Eu (151.0 amu) and ¹⁵³Eu (153.0 amu). If the atomic mass of Eu is 151.96, what is the approximate natural abundance of ¹⁵¹Eu?
50%
Write the chemical formula for lead(II) nitrate
Pb(NO₃)₂
What element with a mass number of 100 has 56 neutrons in its nucleus?
Ruthenium (Ru)
Which is not one of Dalton's hypotheses of atomic theory?
The atoms of one element are the same as atoms of another element.
The Millikan oil drop experiment determined:
The charge of the electron
In two chemical reactions, 4.0 grams of oxygen combine with 3.0 grams of carbon to form one compound, and 8.0 grams of oxygen combine with 3 grams of carbon to form another. This can be explained by:
The law of multiple proportions
Which of the following pairs represent isotopes?
²⁸Si and ²⁹Si
Which of the following would be an isotope of ¹⁴N?
¹⁶N
