Basic Chemistry and Cells Quiz

25 Jun Basic Chemistry and Cells Quiz

Question
Basic Chemistry and Cells Quiz

2. What kind of interaction is shown between sodium and chlorine?

a. The chlorine atom gives up one neutron.

b. The chlorine atom gives up one electron.

c. The sodium atom gives up one proton.

d. The sodium atom gives up one electron.

e. The sodium atom gives up one neutron.

3. Out of covalent, ionic, and hydrogen, the hydrogen bond is the strongest

a. True

b. False

A hydrogen bond is weaker than an ionic or covalent bond.

4. A chemist found one atom with 9 protons, 8 neutrons and 7 electrons. Another atom has 8 protons, 9 neutrons and 10 electrons. Which of the following statements is correct?

a. Both atoms have the same mass number.

b. Both atoms have fulfilled the octet rule.

c. Both atoms are isotopes of the same element.

d. Both atoms have -2 electrical charge.

e. Both atoms are chemically non-reactive and would not interact with other atoms.

5. This diagram shows that two oxygen atoms interact

a. to form hydrogen bonds.

b. to form two covalent bonds.

c. to form one covalent bond.

d. to form four covalent bonds.

e. to form an ionic bond.

A double covalent bond occurs when two atoms share two pairs of electrons.

6. Which term describes the tendency of water molecules to cling to other water molecules?

a. nonpolar

b. adhesion

c. ccohesion

d. polar

e. electronegativity

Water molecules exhibit cohesion when they stick together.

7. From the following, select all boxes that contain the term or symbol which corresponds to one of the six types of atoms that are basic to life.

8. The identity of any atom can be determined by the

a. atomic charge.

b. atomic mass.

c. number of electrons.

d. number of neutrons.

e. number of protons.

9. The atomic number is the number of protons in the nucleus of an atom, which determines the identity of the atom.

a. Positive protons and negative electrons in the nucleus are surrounded by neutral neutrons.

b. Positive protons and negative neutrons in the nucleus are surrounded by neutral electrons.

c. Negative protons and positive neutrons in the nucleus are surrounded by neutral electrons.

d. Neutral protons and negative neutrons in the nucleus are surrounded by positive electrons.

e. Positive protons and neutral neutrons in the nucleus are surrounded by negative electrons.

10. When there in an unequal sharing of electrons between two atoms, what will be the result?

a. a polar molecule, such as water.

b. an ionic compound, such as salt.

c. an electronegative molecule, such as calcium ion.

d. a hydrophobic molecule, such as fat.

e. a nonpolar molecule, such as methane.

11. Drag the appropriate descriptions of the subatomic particles into the following boxes.

12. This diagram shows an atom of phosphorus. How many electrons are in the valence shell?

a. 2

b. 4

c. 5

d. 6

e. 8

13. Which of the following statements is not true about most other solvents, rather than about water ice?

a. It is less dense than liquid water

b. It freezes from top to bottom

c. It floats in water

d. It is denser than liquid water

e. It insulates and slows down the freezing of water below

14. Complete the following statements about water acting as a hydrophilic solvent. Not all choices will be used.

15. The attraction of an atom for the electrons in a covalent bond is called electronegativity.

a. True

b. False

16. Complete the following statements using the pH scale provided when necessary.

17. A solution which resists pH changes is

a. a hydrophilic solution.

b. a buffer.

c. a hydrophobic solution.

d. a base.

e. an acid.

18. A neutral atom of phosphorus was found to have an atomic number of 15 and a mass number of 31. What is the total number of electrons in this atom?

a. 31

b. 8

c. 16

d. 15

e. 46

19. In a solution, if the hydroxide ion concentration exceeds the hydrogen ion concentration the solution is considered to be

a. a base.

b. a neutral solution.

c. an acid.

d. a buffer.

e. a solute.

20. If a neutral oxygen atom gains two electrons from another atom, then the overall charge of this oxygen atom will become

a. 2 more than its original mass number

b. +2

c. 0

d. -2

e. unknown, as you need to know how many protons are present