Chem Unit 2 Quiz and Homework Review
What is the atomic symbol and mass number for an atom containing 50 protons and 64 neutrons?
114 Sn
Covalent bonds
2 nonmetals
What is the electron arrangement for Potassium?
2,8,8,1
Pitchblende is a common ore of the element uranium, containing various proportions of its several oxides. Where on the Periodic Table is uranium found?
Actinides
Write the chemical formula for aluminum acetate
Al(C2H3O2)3
When you have a hydrogen bond, you also have
All 3 forces
Write the chemical formula for bromine pentachloride
BrCl5
Nonpolar bonds
Cancel
Hydrogen bonds are
Covalently bonded to N,O, or F
Identify the species that is oxidized in the following reaction: Cu(s) + 2 Ag⁺¹(aq) → Cu⁺²(aq) + 2 Ag (s)
Cu
Cathode rays are composed of what fundamental particle?
Electrons
Which scientist developed the nuclear model of the atom?
Ernest Rutherford
Ionic bonds
Metal and nonmetal
Hydrogen bonds must have a hydrogen and
N, O or F
Dispersion forces are
Nonpolar
How to find atomic number
Number of protons
Dipole - dipole forces are
Polar
Which two particles of the atom have nearly identical masses?
Proton and neutron
Atomic mass is
Protons + neutrons
How to find mass number
Protons + neutrons
The nucleus of an atom contains:
Protons and neutrons
Which type of electromagnetic radiation has the largest wavelength?
Radio waves
Which scientist determined the charge of the electron?
Robert Millikan
What is the atomic symbol for the element in Group 5A (15) and the fifth period?
Sb
The cathode ray tube experiment determined:
The existence of electrons
Atomic number is the same as
The number of protons
The atomic mass of germanium (Ge) on the periodic table is 72.630 amu. Which of the following best explains why the atomic mass is a fraction between 72 and 73?
The presence of different isotopes
What element was originally named stannum?
Tin
Light wave A has a greater frequency than light wave B. Which has a greater wavelength?
Wave B
In general, atomic radius
decreases across a period and increases down a group.
Forces weakest to strongest
dispersion - dipole - dipole - hydrogen
Polar bonds
don't cancel
Columns on the periodic table are known as
groups
Ionization energy increases from
left to right and from the bottom to the top of the periodic table
Rutherford's gold foil experiment determined that
most of the space in an atom is empty except for a concentrated area called the nucleus.
Neutral atoms of all isotopes of a given element have the same
number of electrons
Transistors are made from Si, but in the past, were made from Ge. What elements do these symbols represent?
silicon; germanium
Bigger the molecular weight
the stronger the dispersion force
What does the mass number of an atom represent?
total number of protons and neutrons in the atom
