Which of the following is a physical property of paper?
It does not rust when exposed to oxygen.
It is flammable.
It can be easily ripped into smaller pieces.
Chemical properties can always be determined by simply touching or looking at a substance.
Boiling water is a chemical change.
Drying a wet dish with a towel is a physical change.
Which of the following are examples of physical changes?
A banana is sliced and put in a fruit salad.
An ice cube sits in the hot sun and melts into a puddle, then evaporates.
A slice of bread is left in the toaster too long and burns to a crisp.
A milk carton is left out of the refrigerator and turns sour.
You are examining a certain substance as part of an experiment. The substance's atoms are moving randomly and rapidly, and take the shape of the container they are placed in. When you open the container, the substance diffuses quickly into the air. Given this information, you conclude that the substance is a:
Solid
Liquid
Gas
Which of the following are NOT properties of a solid?
Tightly packed atoms
Atoms diffuse quickly
Can be compressed
Definite shape and volume
Dry ice is the solid form of carbon dioxide, which lacks a liquid state. By which process is dry ice created?
deposition
freezing
condensation
sublimation
Which two changes of state result in a liquid?
Freezing
Sublimation
Melting
Condensation
When enough heat is added to most solids, they will either melt or sublimate.
Electrons have a positive charge.
"Average atomic mass" is the number of protons plus electrons in an atom.
Which of the following terms refers to the number of protons and neutrons in an atom's nucleus?
Mass number
Atomic number
Average atomic mass
Nuclear total
A given atom has no charge. It has an atomic number of 5. How many electrons does it have?
10
8
5
2
If an atom has an atomic mass number of 10, and you know it has 7 neutrons, the atomic number must be 3.
Which parts of an atom orbit around the nucleus?
Protons
Electrons
Neutrons
Protons and electrons
Electrons are negative, protons are positive, and neutrons have no charge.
A particular atom has two isotopes. The mass of the first isotope, in amu, is 20.802, and its percent abundance is 42.5. The mass of the second isotope, in amu, is 35.599, and its percentage abundance is 57.5. What is the atom's average atomic mass?
29.310 amu
29 grams
13.783 amu
146.55 amu
Oxygen has three naturally occurring isotopes: Mass of 15.995, natural abundance of 99.76% Mass of 16.999, natural abundance of 0.038% Mass of 17.999, natural abundance of 0.205%
What is the average atomic mass?
16.000 amu
15.9 grams
33.334 amu
15.8 amu
Atomic mass is measured in amu, a unit derived from the mass of carbon-12.
