Periodic Table
What are the symbols for iron, bromine, lithium, oxygen, copper, and chlorine?
Fe, Br, Li, O, Cu, Cl
Answer the problem with the proper amount of sig figs.
125 × 9.000
1,130 or 1.13x103
How many miles will a person run during a 10 kilometer race?
(0.621 mi=1.00 km)
6 miles
Determine the number of protons, neutrons, and electrons in the following isotope:
atomic number 53, atomic mass number 131, charge of 1−
p: 53; n: 78; e: 54
What is the formula for dinitrogen trioxide
N2O3
Label each element by what group they are in:
1) magnesium
2) chlorine
3) xenon
1) alkaline earth metals 2) halogens 3) noble gases
Answer the problem with the proper amount of sig figs.
13.77 + 908.226 + 515
1,437 or 1.437x103
Complete the two unit conversions:
3779 µg = ? g
1738 km = ? m
3.779 x 10-3 g; 1,738,000 m
What's the symbol of the ion having 16 protons and 18 electrons?
sulfide ion, S2-
What is the name of the polyatomic ion SO42-
sulphate
What are the chemical names for the symbols Xe, Rb, Mn, Co, Sn, and B?
Xenon, Rubidium, Manganese, Cobalt, Tin, Boron
Answer the problem with the proper amount of sig figs.
118.7/2.0 grams−35.5 grams
24
Express a speed of 65 mi/h in SI units (m/s)
29 m/s
2963 Cu
What is the atomic number and the mass number of the element listed above? How many protons, neutrons, and electrons does it have?
atomic number: 29
mass number: 63
p: 29 n: 34 e: 29
What is the formula for the nitrite ion
NO2-
Ag (silver) is in ____ 11 and ____ 5, and is part of the _______.
a) group, period, transition metals/coinage metals
b) group, period, inner transition metals/coinage metals
c) period, group, inner transition metals/coinage metals
e) period, group, transition metals
A
A meter has 1000 millimeters in it. How many significant figures does this number have?
The conversion is exact. An infinite number of significant figures
As an instructor is preparing for an experiment, he requires 225 g phosphoric acid. The only container readily available is a 150-mL Erlenmeyer flask. Is it large enough to contain the acid, the density of which is 1.83 g/mL?
Yes, because the acid's volume will be 123 mL
Bromine has two isotopes, 79-Br and 81-Br, whose masses (78.9183 and 80.9163 amu) and abundances (50.69% and 49.31%) were determined in earlier experiments. Calculate the average atomic mass of Br based on these experiments. How does this compare to the value given on the periodic table?
79.90 amu; this matches the value on the periodic table,
What are the resulting compound formulas of each of these combinations:
1) Mg2+ and Cl-
2) Fe3+ and CO32-
1) MgCl2
2) Fe2(CO3)3
What are the common charges of the following elements:
1) Ba 2) C 3) Ar 4) Ag 5) K 6) S 7) Br 8) N
1) +2 2) +4 3) 0, it's neutral
4) +1, it's an exception when it comes to transition metals
5) +1 6) -2 7) -1 8) -3
Write these numbers in scientific notation and with proper sig figs: 42,000; 27.0040; 150,000,000; 0.00000003500; 50,000; 0.0205
(hint: the sig figs stay the same as they are in the number above)
4.2 x 104; 2.70040 x 101; 1.5 x 108, 3.500 x 10-8; 5 x 104; 2.05 x 10-2
Find the mass, in pounds, of 1.00 m3 of corn syrup (density of 1.38 g/cm3). Hint: 1 km=2.20462 lb
3.04 x 103 lb
Rubidium has 2 isotopes: Rubidium-85 (atomic mass of 84.911 amu) and Rubidium-87 (atomic mass of 86.909 amu). The atomic weight of Rubidium is reported to be 85.47 according to the periodic table. Based on this information, which of the isotopes is more abundant?
Rubidium-85
What are the names for ClO- and ClO3-
hypochlorite and chlorate