Chemistry Practice Quiz

1. An atom is:

A. any molecule with equal numbers of electrons and protons.
B. a noble gas.
C. held together with a covalent bond.
D. the smallest particle of an element.

2. In magnesium atoms (Mg), the number of electrons in the third shell will be: (Periodic Table)

A. 0.
B. 1.
C. 2.
D. 3.

3. Chemical activity between atoms usually involves:

A. Outer shell electrons.
B. Only the neutrons.
C. Some of the protons
D. All of the electrons.
E. None of the above

4. An electron in a "s" suborbital has the following approximate geometry:

A. three "dumbbell" shaped orbitals at right angles.
B. three "donut" shaped orbitals at right angles.
C. spherical orbital.
D. flat or sheet-like orbital.
E. None of the above

5. Potassium fluoride is represented by which formula?

B. KF2
C. K2F
E. None of the above

6. An unstable isotope that gives off radiation or matter is described as:

A. Radioactive.
B. A radical.
C. A strong nuclear force.
D. An ion.
E. None of the above

7. Any atom that has lost or gained electrons is known as a/an:

A. Molecule.
B. Compound.
C. Crystal.
D. Ion.
E. None of the above.

8. Which of the following elements has the greatest electronegativity? (Periodic Table)

A. Carbon.
B. Oxygen.
C. Sodium.
D. Chlorine.
E. Nitrogen.

For the next four questions information must be extracted from a (Periodic Table).

9. How many electrons does nitrogen have in its outermost (valence) energy level?

A. 4
B. 8
C. 7
D. 5
E. 2

10. A radioactive isotope of sulfur has the mass number 35. How many neutrons does 35S have? (Periodic Table)

A. 16
B. 19
C. 32
D. 35
E. 51

11. Based on electron configuration, which of the elements below would exhibit chemical behavior most like that of oxygen? (Periodic Table)

A. C
B. H
C. N
D. S
E. P

12. Based on the (Periodic Table), which of the atoms would have the same valence as that of carbon?

A. Nitrogen (N)
B. Fluorine (F)
C. Neon (Ne)
D. Magnesium (Mg)
E. Silicon (Si)


13. An example of a trace element that is essential to humans is:

A. nitrogen
B. calcium
C. iodine
D. carbon
E. oxygen

14. A covalent bond is likely to be polar if:

A. one of the atoms sharing electrons is much more electronegative than the other atom
B. the two atoms sharing electrons are equally electronegative
C. the two atoms sharing electrons are of the same element
D. it is between two atoms that are both very strong electron acceptors
E. it joins a carbon atom to a hydrogen atom

15. The ionic bond of sodium chloride is formed when:

A. chlorine gains an electron from sodium
B. sodium and chlorine share an electron pair
C. sodium and chlorine both lose electrons from their outer energy levels
D. sodium gains an electron from chlorine
E. chlorine gains a proton from sodium

16. A covalent chemical bond is one in which:

A. electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged
B. protons or neutrons are shared by two atoms so as to satisfy the requirements of both
C. outer shell electrons are shared by two atoms so as to satisfactorily fill the outer electron shells of both
D. outer shell electrons on one atom are transferred to the inner electron shells of another atom
E. the inner shell electrons of one atom are transferred to the outer shell of another atom

17. Isotopes are atoms of an element that differ from those usually found in that they have different:

A. Numbers of electrons.
B. Numbers of nuclei.
C. Numbers of protons.
D. Chemical properties.
E. None of the above.

18. Hydrogen bonds can be accurately categorized as:

A. Very strong bonds.
B. High energy bonds.
C. Weak attractive forces between hydrogen of one molecule and oxygen or nitrogen of another.
D. Bonds where electrons are shared.
E. None of the above.

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