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100
Select the correct symbol for an atom of tritium. a. n c. H b. H d. H
What is d. H
100
How is the number of neutrons in the nucleus of an atom calculated? a. Add the number of electrons and protons together. b. Subtract the number of electrons from the number of protons. c. Subtract the number of protons from the mass number. d. Add the mass number to the number of electrons.
What is c. Subtract the number of protons from the mass number.
100
What unit is used to measure weighted average atomic mass? a. amu c. angstrom b. gram d. nanogram
What is a. amu
100
Which of the following statements is NOT true? a. Protons have a positive charge. b. Electrons are negatively charged and have a mass of 1 amu. c. The nucleus of an atom is positively charged. d. Neutrons are located in the nucleus of an atom.
What is b. Electrons are negatively charged and have a mass of 1 amu.
100
What is the maximum number of d orbitals in a principal energy level? a. 1 c. 3 b. 2 d. 5
What is d. 5
200
All atoms are ____. a. positively charged, with the number of protons exceeding the number of electrons b. negatively charged, with the number of electrons exceeding the number of protons c. neutral, with the number of protons equaling the number of electrons d. neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons
What is c. neutral, with the number of protons equaling the number of electrons
200
As a consequence of the discovery of the nucleus by Rutherford, which model of the atom is thought to be true? a. Protons, electrons, and neutrons are evenly distributed throughout the volume of the atom. b. The nucleus is made of protons, electrons, and neutrons. c. Electrons are distributed around the nucleus and occupy almost all the volume of the atom. d. The nucleus is made of electrons and protons.
What is c. Electrons are distributed around the nucleus and occupy almost all the volume of the atom.
200
Isotopes of the same element have different ____. a. positions on the periodic table c. atomic numbers b. chemical behavior d. mass numbers
What is d. mass numbers
200
In which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly? a. In, 49 protons, 49 electrons c. Cs, 55 protons, 132.9 electrons b. Zn, 30 protons, 60 electrons d. F, 19 protons, 19 electrons
What is a. In, 49 protons, 49 electrons
200
Using the periodic table, determine the number of neutrons in O. a. 4 c. 16 b. 8 d. 24
What is b. 8
300
distance between wave crests
What is wavelength
300
separation of light into different wavelengths
What is spectrum
300
What is the temperature –34 C expressed in kelvins? a. 139 K c. 239 K b. 207 K d. 339 K
What is 239 K
300
What is the volume of 45.6 g of silver if the density of silver is 10.5 g/mL? a. 0.23 mL c. 479 mL b. 4.34 mL d. none of the above
What is 4.34 mL
300
Which hypothesis led to the discovery of the proton? a. When a neutral hydrogen atom loses an electron, a positively-charged particle should remain. b. A proton should be 1840 times heavier than an electron. c. Cathode rays should be attracted to a positively-charged plate. d. The nucleus of an atom should contain neutrons.
What is When a neutral hydrogen atom loses an electron, a positively-charged particle should remain.
400
a substance formed in a chemical reaction
What is product
400
starting substance in a chemical reaction
What is reactant
400
discrete bundle of electromagnetic energy
What is photon
400
energy needed to move an electron from one energy level to another
What is quantum
400
number of wave cycles passing a point per unit of time
What is frequency
500
gaseous state of substance that is a liquid or solid at room temperature
What is vapor
500
a physical blend of two or more components
What is mixture
500
part of a sample having uniform composition and properties
What is phase
500
not uniform in composition
What is heterogeneous mixture
500
a substance formed in a chemical reaction
What is product