Stem Ch 2 Online Test
Covers basic chemistry and water
- 1.Atoms are composed of
- A.
Protons with a positive charge
- B.
Neutrons with no charge
- C.
Electrons with a negative charge
- D.
All of the above
- 2.Electrons of an atom
- A.
Are found in the nucleus along with the protons
- B.
Orbit the nucleus in various energy levels
- C.
Have a positive charge
- D.
Are attracted to the positive charge of neutrons
- 3.The bond formed when two atoms share a pair of electrons is called a
- A.
Hydrogen bond
- B.
Nonpolar bond
- C.
Covalent bond
- D.
Ionic bond
- 4.An atom that has gained or lost electrons is called a (an)
- A.
Molecule
- B.
Quark
- C.
Ion
- D.
Element
- 5.Atoms become more stable when they form compounds because
- A.
They always lost electrons when they form compounds
- B.
Their outer orbitals become filled when they form compounds
- C.
They always gain electrons when they form compounds
- D.
Their nucleus loses extra protons when they form compounds
- 6.A water molecule is polar because its hydrogen and oxygen atoms
- A.
Both lose electrons
- B.
Become ions
- C.
Both gain electrons
- D.
Do not share the electrons equally
- 7.Polar molecules, such as water, have
- A.
No negative and positive poles
- B.
Both negative and positive poles
- C.
Only a negative pole
- D.
Only a positive pole
- 8.Which of the following characteristics of water is NOT a result of hydrogen bonding?
- A.
Adhesion
- B.
Capillarity
- C.
Cohesion
- D.
All of the above are a result of hydrogen bonding
- 9.Is HCl an ionic or covalent compound?
- A.
Ionic
- B.
Covalent
- C.
Neither
- D.
Both
- 10.When drawing a Bohr diagram, how many electrons can fit on the inner orbital closest to the nucleus?
- A.
1
- B.
2
- C.
4
- D.
8
- 11.On a Bohr diagram, the electrons on the outermost shell are called...
- A.
Ions
- B.
Valence electrons
- C.
Isotopes
- D.
Electronegative
- 12.If you were to draw the Bohr diagram for Sulfur, how many protons would be on the diagram?
- A.
6
- B.
10
- C.
16
- D.
32
- 13.On the Bohr diagram of Sulfur, how many orbitals (shells) would the drawing contain?
- A.
1
- B.
2
- C.
3
- D.
4
- 14.On a Lewis Dot diagram of Sulfur, how many dots would you draw around the S?
- A.
3
- B.
6
- C.
16
- D.
32
- 15.How many neutrons does Chlorine have?
- A.
10
- B.
17
- C.
18
- D.
34
- 16.
If you were to bond Magnesium with Fluorine to make magnesium fluoride, how would you write the final compound out with charges?(Imagine the numbers on the compound choices are subscripts)- A.
MgF2 with Mg having a charge of +2 and Fluorine having a charge each of -1.
- B.
Mg2F with Mg having a charge each of -1 and Fluorine having a charge of +2
- C.
MgF no charges on either because it is a covalent bond
- D.
F2Mg with Fluorine having a charge each of +1 and Magnesium having a charge of -2.
- 17.If you were to bond hydrogen with bromine, would the bond between them be single or a double bond?
- A.
Single
- B.
Double
- C.
Both
- D.
Neither
- 18.Which property of water explains the fact that a penny can hold a lot of water drops?
- 19.How many electrons does fluorine need to gain or lose in order to fill its outer shell?
- 20.Give a specific example of a cation.
- 21.Imagine sucrose has the formula C12H22O11. (The numbers are subscripts here). How many atoms does oxygen contain?
- 22.What is the atomic mass number of carbon?
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