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Unit Assessment: Introduction to Chemistry Quiz 2
Question 1
Chemistry
Neon has an atomic number of 10 and an atomic mass of approximately 20. How many neutrons does neon have?
- 10
- 20
- 5
- 30
Question 2
Which is the biggest?
- Electron
- Atom
- Neutron
- Proton
Question 3
Gold is abbreviated Au in the periodic table.
What is the atomic mass of gold?
- 79
- 197
- 118
- 276
Question 4
Fluorine, F, has an atomic number of 9 and an approximate atomic mass of 19. How many protons does a fluorine atom have?
- 9
- 19
- 28
- 10
Question 5
The lines on the above drawing of caffeine indicate:
- Covalent bonds
- Hydrogen bonds
- Ionic bonds
- Polar bonds
Question 6
The partial negative charge at one end of a water molecule is attracted to the partial positive charge of another water molecule. This attraction is called:
- a covalent bond
- a hydrogen bond
- an ionic bond
Question 7
A double covalent bond is the sharing of a total of how many electrons?
- 4
- 2
- 6
- 8
Question 8
What determines the number of covalent bonds formed by an atom?
- Orbitals found in the atom
- Electrons in the outer valence shell of the atom
- Electrons in each orbital of the atom
- Valence shells in the atom
Question 9
Which characteristic of water protects fish when a lake freezes?
- All these characteristics
- water as a solvent
- Water is less dense as a solid
- cohesion
Question 10
Which of the following molecules is hydrophilic?
- table salt
- butter
- olive oil
Question 11
Which of the following statements is true concerning hydrogen bonding and the liquid and solid states of water?
- Only solid water forms hydrogen bonds.
- Both liquid and solid states of water form hydrogen bonds.
- Only liquid water forms hydrogen bonds.
Question 12
You test soda (pH 2.5) with blue litmus paper. What color would you expect to see?
- Red
- Green
- Blue
- Yellow
Question 13
You test bleach (pH 13) with red litmus paper. What color would you expect to see?
- Blue
- Red
- Green
- Yellow
Question 14
pH is a measure of
- hydrogen ions
- toxicity
- chemical reactivity
- electrical charge
Question 15
You have a solution that has a pH of 5 and need it to be pH 8. What do you do?
- Add a base
- Add an acid
- Add a base
Question 1
Beryllium, Be, has an atomic number of 4 and an atomic mass of approximately 9. How many protons does a beryllium atom have?
- 4
- 5
- 13
- 9
Question 2
An element has 43 protons and 50 neutrons. What is the ATOMIC MASS of this element?
- 43
- 93
- 50
Question 3
An atom is converted into an ion by adding or removing ___________________.
- neutrons
- protons
- electrons
Question 4
Neon has an atomic number of 10 and an atomic mass of approximately 20. How many electrons does neon have in its first shell?
- 20
- 2
- 10
- 8
Question 5
A shared pair of electrons is called a: _________.
- covalent bond
- hydrogen bond
- ionic bond
- polar bond
Question 6
Which bond is the weakest?
- Covalent bonds
- Hydrogen bonds
- Ionic bonds
- All 3 of these bonds are approximately the same strength.
Question 7
Will a polar covalent bond form between the two nitrogen atoms in nitrogen gas (N2)?
- No because hydrogen is needed to form polar covalent bonds.
- Yes, because nitrogen is not very electronegative.
- Yes, because nitrogen is very electronegative.
- No because both atoms are equally electronegative.
Question 8
A covalent chemical bond is one in which:
- Outer shell electrons of one atom are transferred to the inner electron shells of another atom.
- Protons or neutrons are shared by two atoms so as to satisfy the requirements of both.
- Outer shell electrons are shared by two atoms so as to satisfactorily fill the outer electron shells of both.
- Electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged
Question 9
Which characteristic of water protects fish when a lake freezes?
- cohesion
- All of these characteristics.
- water as a solvent
- water is less dense as a solid
Question 10
You are able to fill a glass with water so that the water goes above the rim of the glass. What property of water have you observed?
- density
- moderates temperature
- cohesiveness
Question 11
Which of the following molecules is hydrophilic?
- table salt
- olive oil
- butter
Question 12
You have a solution that has a pH of 8 and need it to be pH 5. What do you do?
- Add water
- Add an acid
- Add a base
Question 13
The pH of a solution is a measure of what in the solution?
- Concentration of hydrogen ions
- Total concentration of all ions in a solution
- Concentration of electrons
- Potential energy
Question 14
A substance with a pH of 4 is _______________?
- basic
- neutral
- acidic
Question 15
You test bleach (pH 13) with red litmus paper. What color would you expect to see?
- Red
- Blue
- Yellow
- Green