Chem 1045 final chapter 1-3
Osmium has a density of 22.6 g/cm3. What volume (in cm3) would be occupied by a 21.8 g sample of osmium?
0.965
How many moles contain 6.022 x 1023 lithium atoms?
1 mole
How many moles are in 1.25 g of calcium chloride, CaCl2?
1.13 x 10-2moles
What is the total number of atoms contained in 2.11 moles of nickel?
1.27 x 1024atoms
When 0.500 mol of HC2H3O2 is combined with enough water to make a 300.0 mL solution, the concentration of HC2H3O2 is ________ M.
1.67
How many electrons does Al3+ contain
10
The prefix milli- in the metric system represents a factor of _____.
10-3
The prefix nano- in the metric system represents a factor of _____
10-9
Which solution has the same number of moles of NaOH as 50.0 mL of 0.100 M solution of NaOH?
100.0 mL of 0.0500 M solution of NaOH
What volume (mL) of a concentrated solution of magnesium chloride (9.00 M) must be diluted to 350. mL to make a 2.75 M solution of magnesium chloride?
107
The correct result (indicating the proper number of significant figures) of the following addition is ________.121.20.12+ 0.012
13
What is the answer for the following calculation: (1.249 - 0.0234) x 139.37?
170.9
Using the periodic table, what is the atomic number of argon? 26.98
18
Which of the following has the same number of significant figures as the number 1.00310?
199.791
How many significant figures are in 0.20 L?
2
Sulfur forms an ion with a charge of ________.
2-
How many grams are in 12.5 moles of Ba(OH)2?
2.14 x 103g
How many neutrons are in chlorine-37?
20
How many milliliters of a stock solution of 11.7 M HNO3 would be needed to prepare 0.500 L of 0.500 M HNO3?
21.4
The mass % of H in methane (CH4) is ________.
25.13
The temperature of 25 °C is ________ in Kelvins.
298
How many significant figures are in 0.0000401 kg?
3
How many significant figures should be retained in the result of the following calculation?12.00000 × (0.9893 + 13.00335) × 0.0107
3
The charge on the manganese in the salt MnF3 is ________.
3+
How many protons are there in one atom of 71Ga?
31
Round the number 3456.5 to two significant figures.
3500
How many grams are in 2.05 x 1023 molecules of dinitrogen pentoxide?
36.8 g
Which one of the following is the highest temperature?
38 °C
To dilute a HCl solution from 0.500 M to 0.100 M the final volume must be:
5 times the original volume
How many atoms can be found in 1.00 mole of mercury?
6.02 x 1023atoms
What is Avogadro's number?
6.022 x 10^23particles/mole
What mass (g) of potassium chloride is contained in 430.0 mL of a potassium chloride solution that has a chloride ion concentration of 0.193 M?
6.19
6.02 x 1023atoms
7.29 x 1023molecules
The correct answer (reported to the proper number of significant figures) to the following is ________.(12.67 + 19.2)(3.99) / (1.36 + 11.366) = ________
9.999
What is a cation?
A cation is defined as an atom that has lost electrons and forms a positive charge.
The formula for the compound formed between aluminum ions and phosphate ions is ________.
AlPO4
The correct name for Al(OH)3 is ________.
Aluminum hydroxide
What is an anion?
An anion is defined as an atom that has gained electrons and forms a negative charge.
A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. The molecular weight of the compound is 60.05 amu. The molecular formula of this compound is ________.
C2H4O2
An unknown hydrocarbon compound was analyzed for hydrogen by elemental analysis and results show that it contains 15.88 % H and 84.12 % C. What is the empirical formula?
C4H9
What is the formula of the ionic compound formed between Ca and S?
CaS
What is the correct formula for cobalt(III) chloride?
CoCl3
Determine the formula for copper(II) nitrate.
Cu(NO3)2
Which subatomic particles has the smallest mass?
Electrons
What is the correct formula for iron(III) chloride?
FeCl3
Which elements are considered noble gases?
He, Ne, Ar
What is the correct formula for iodine monochloride?
ICl
What is the formula for the ionic compound formed between Li and N?
Li3N
Predict the empirical formula of the ionic compound that forms from magnesium and oxygen.
MgO
Which of the following is an ionic compound?
Na2O
Of the following, ________ contains the greatest number of electrons.
P3-
Of the choices below, which one is not an ionic compound?
PCl5
An anion is defined as an atom that has gained electrons and forms a negative charge.
Pb(NO3)2
Which statement about subatomic particles is NOT true?
Protons and neutrons have the same charge
Precision is defined as how _____ the measured values are to one another.
Reproducible
An experiment requires you to make several measurements. Based on the values in the table below, what would be the best statement that represents the data set if the true value is 2.73?
The measurements in Trial B are precise, however, not accurate. Trial's A and C are neither accurate nor precise.
An explanation for the collection of observations is considered a _____.
Theory
Which of the following would be considered a chemical change?
a rusting nail
Which is of the following is an example of a physical property?
acids are sour and bases are bitter
How would you prepare a 0.5 M solution of sodium hydroxide?
add 20.0 grams of sodium hydroxide to 1 L of water
Which is of the following is an example of a chemical property?
an iron nail rusts
The number of protons in one atom of an element is that element's __________.
atomic number
Isotopes are atoms that have the same ________ but differing ________.
atomic numbers, mass numbers
What can be used to measure the mass of an object?
balance
Which of the following would be considered a physical change?
boiling water
The following is an example of a chemical change.
burning paper
The correct name for H2CO3 is ________.
carbonic acid
The correct name for HClO3 is ________.
chloric acid
All atoms of a given element have the same ________.
density
The correct name for N2O5 is ________.
dinitrogen pentoxide
A sulfur oxide is 50.0% by mass sulfur and 50.0 % by mass oxygen. This molecular formula could be ________.
either SO2 or S2O4
What are the proper units for molar mass in chemistry?
g/mol
1 mole of which of the following will have the largest mass?
gold
A combination of sand, salt, and water is an example of a ________. Note that sand is not water soluble.
heterogeneous mixture
A salt water solution is classified as what type of matter?
homogeneous mixture
The correct name for HCl (aq) is ________.
hydrochloric acid
Where would you expect to find a stored bottle of NaOH in the laboratory?
in the storage cabinet labeled strong bases
The only time Roman Numerals are used when naming a compound is if the compound is
ionic and contains a Family B cation
What is the name of Fe2O3?
iron(III) oxide
An element in the upper right corner of the periodic table ________.
is definitely a nonmetal
The gold foil experiment performed in Rutherford's lab ________.
led to the discovery of the atomic nucleus
To calculate the number of neutrons in an atom, you would do which of the following?
mass number - atomic number
When a metal and a nonmetal react, the ________ tends to lose electrons and the ________ tends to gain electrons.
metal, nonmetal
Isotopes of carbon differ with respect to the number of _________.
neutrons
The correct name for NiF2 is ________.
nickel (II) fluoride
The correct name for HNO2 is ________.
nitrous acid
Elements arranged horizontally in the periodic table are in the same_____
period
Which list of elements contains ONLY nonmetals?
phosphorus, nitrogen, oxygen
The correct name for K2S is ________.
potassium sulfide
The correct name for NaHCO3 is ________.
sodium bicarbonate
Which of the following elements form +2 ions?
strontium, magnesium, calcium
Due to periodicity, which of the following elements has chemical behavior similar to that of Oxygen?
sulfur
Which of the following is not an exact number?
the volume was measured at 45.6 mL
Accuracy is defined as how close a measured value comes to a _____.
true value
The correct name for V(SO4) is ________.
vandium (II) sulfate
The formula for the compound formed between ammonium ions and phosphate ions is ________.
(NH4)3PO4
The charge on the copper ion in the salt CuO is ________.
+2
Express 1.40 x 10-3 L in decimal notation.
0.00140 L
Round the number 0.007222 to three significant figures.
0.00722
In which one of the following numbers are none of the zeros significant? 10.0
0.009
What is the concentration (M) of a NaCl solution prepared by dissolving 9.3 g of NaCl in sufficient water to give 350 mL of solution?
0.45
