A student is observing a chemical reaction occurring with visible bubbling. The bubbling eventually stops. The student can see that some of the original reactants are still intact inside the beaker, so he knows that not all the reactant has been used up. Therefore, the student knows he is now observing:
A. A failed reaction.
B. Equilibrium.
C. A decrease in temperature.
D. A completed reaction.
What are isotopes?
A. Elements which have the same number of protons but a different number of neutrons.
B. Elements with the same atomic number but different atomic mass numbers.
C. Elements which have a different number of protons than electrons.
D. Both A and B are correct.
The chemical 4[NH4Fe(SO4)2 × 12H] contains how many more hydrogen atoms than oxygen atoms?
A. 16 hydrogen atoms
B. There are more oxygen atoms than hydrogen atoms.
C. 32 hydrogen atoms
D. 64 hydrogen atoms
Which of these is a polar molecule?
A. CO2
B. BF3
C. C6H6
D. NH3
An unknown element has a mass number of 33 and an atomic number of 12. How many neutrons does the element contain?
A. 21
B. 12
C. 33
D. 45
Rank the following intermolecular forces in decreasing strength: hydrogen bonding, London dispersion forces, ion-dipole interactions, ion bonding, and dipole-dipole interactions.
A. ionic bonding > dipole-dipole interactions > ion-dipole interactions > hydrogen bonding > London dispersion forces
B. ionic bonding > hydrogen bonding > ion-dipole interactions > dipole-dipole interactions > London dispersion forces
C. ionic bonding < ion-dipole interactions < dipole-dipole interactions < hydrogen bonding < London dispersion forces
D. ionic bonding > ion-dipole interactions > hydrogen bonding > dipole-dipole interactions > London dispersion forces
An unknown element is found to contain 45 protons and an atomic mass of 64, what is its atomic number?
A. It cannot be determined.
B. 19
C. 45
D. 64
Elements that are in the same column of the periodic table are in the same:
A. period.
B. group.
C. row.
D. classification
What is the purpose of scientific notation?
A. There is no purpose.
B. The purpose is to handle bigger numbers more easily.
C. The purpose is to handle smaller numbers more easily.
D. The purpose is to handle both smaller and bigger numbers more easily.
What is the metric prefix meaning one billionth?
A. Nano
B. Milli
C. Micro
D. Pico
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