Atoms and PT
What are the three subatomic particles?
Neutrons, protons, and electrons
How many miles will a person run during a 10 kilometer race?
(0.621 mi=1.00 km)
6 miles
180
2
How many protons, neutrons, and electrons are in Bromine (as seen on periodic table)?
35 protons, 35 electrons, 45 neutrons
How close a measurement is to the accepted value is called ______
accuracy
How many groups and periods are on the periodic table?
18 groups (vertical)
7 periods (rows)
How many minutes are in 1.5 years?
(use 365 days= 1 year)
788,400 minutes
790,000 minutes rounded to 2 sig figs
How many sig figs in the following number:
0.0400
3
What is the atomic number, symbol, and atomic mass of Carbon (in that order)?
6, C, 12.011 g/mol
Complete the two unit conversions:
3779 µg = ? g
1738 km = ? m
3.779 x 10-3 g; 1,738,000 m
Nitrogen with a 3- charge has how many total electrons?
10
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, acid volume will be 123 mL
Solve the following and round correctly:
4.0 x 13.3
53
(53.2 rounds to two sig figs)
The element copper has naturally occurring isotopes with mass numbers of 63 and 65.
The relative abundance and atomic masses are 69.2% for a mass of 62.93amu and 30.8% for a
mass of 64.93amu. Calculate the average atomic mass of copper.
(g/mol and amu are interchangeable!)
63.5 amu or g/mol
Convert the temperature of scalding water, 54 °C, into degrees Fahrenheit and kelvin.
129.2 °F
327.15 K
(F = (9/5)C + 32) and (K= C + 273.15)
Consider the species 72^Zn, 75^As and 74^Ge
They have the same number of which subatomic particle(s)?
Convert 1.00 km3 to cubic micrometers.
1.00 x 10^27 μm^3
Solve the following and round correctly:
(2.33 + 1.5) / 123.1
0.031
Magnesium has three naturally occurring isotopes with masses of 23.99 amu, 24.99
amu, and 25.98 amu and natural abundances of 78.99%, 10.00%, and 11.01%,
respectively. Calculate the atomic mass of magnesium.
24.31 g/mol
Calculate the density in g/cm^3 for a 2.75 kg substance that occupies 250.0 cm^3 of space.
11.0 g/cm^3
Name 3 metalloids
The density of air in a room is 1.19 g/L. However, we don't measure the volume of rooms in Liters, so convert this density to kg/ft^3
1 in = 2.54 cm (exactly) 1 L = 10^3 cm^3
Solve the following and round correctly:
4.659 x 3.9870 ÷ (452.6775 - 452.31) =
51
Gallium has two naturally occurring isotopes: Ga-69 with a mass of 68.9265 amu and a
natural abundance of 60.11%, and Ga-71. Use the atomic mass of gallium from the
periodic table to find the mass of Ga-71.
70.92 g/mol
A beaker containing a black-yellow powder has a magnet put into it. When the magnet is removed, black particles are stuck to it, leaving a yellow powder behind in the beaker.
The black-yellow powder is therefore
a mixture