Color, conductivity, state of matter, magnetism, luster, malleability, etc.
100
To which atom are all other atom's masses compared?
Carbon-12 is exactly 12 amu.
100
Name the three subatomic particles.
Protons, neutrons and electrons.
100
Which orbit in Bohr's atomic model has the greatest energy?
E6
200
Is iodine a metal or a nonmetal?
Iodine is a nonmetal.
200
Who created the modern periodic table?
Mendeleev
200
Define an atom.
An atom is the smallest representative unit of an element that retains its identity in a chemical reaction.
200
What is the charge on the nucleus of an atom?
A nucleus has a positive charge.
200
What is the equation for frequency?
Frequency= speed of light/wavelength
300
The mass of a beaker is 21.77 grams. The mass of the beaker and aluminum is 22.04 grams. How many grams of aluminum were used?
0.27 grams of aluminum
300
Define chemial property.
A chemical property is a characteristic that a substance undergoes in a chemical reaction that produces a new substance.
300
What is different about atoms of different elements?
They have different mass.
300
What two conclusions did Rutherford make from his gold foil experiment?
Rutherford concluded that atoms have a dense, small nucleus with a positive charge. He also concluded that an atom is mostly empty space.
300
If the frequency of a wave is 5.82 x 10^16 hz, and Planck's constant is equal to 6.63 x 10^-34 j.s, find the energy. Round to two decimal places.
E= 3.86 x 10^-17 j
400
Describe how the modern periodic table is organized.
The periodic table is organized by least to greatest atomic number. The periods (horizontal rows) go from least to greatest valence electrons. The groups (vertical columns) have the same number of valence electrons, which gives them similar chemical characteristics.
400
What is the difference between an element and a compound?
An element is the simplest form of matter that has a unique set of properties. An element can't be broken down into simpler substances by chemical means. A compound is a substance that contains two or more elements chemically combined in a fixed proportion.
400
What is the Law of Definite Proportions?
Atoms combine in simple, whole number ratios by weight.
400
Describe Thomson's plum-pudding model of an atom.
Thomson believed that an atom is a positively charged sphere with negatively charged electrons embedded into this sphere like plum-pudding.
400
Is a wavelength of 10^-8 infared, visible, or ultraviolet?
Ultraviolet
500
Does sulfur react with HCl?
Sulfur does not react with HCl.
500
Which Greek philosopher defined an element as, "a body into which other bodies may be analyzed...and not itself divisible into bodies different in form."+
Aristotle.
500
List two of Dalton's ideas.
1. All matter is made up of atoms.
2. Atoms are indivisible.
3. Atoms of the same kind of matter are the same. Atoms of different kinds of matter are different.
4. The Law of Definite Proportions
5. The same atoms may combine is more than 1 ratio.
500
What is an alpha particle?
An alpha particle is a positively charged particle consisting of two protons and two neutrons. It is identical to the nucleus of a helium atom.
500
How is the color produced in a neon sign?
An electric current is passed through one or more noble gases.