Question

instructional science review quiz (term 2)
kankakee high school
name:
date:
score: /15 (this will be recorded as a classwork)
part a: multiple choice (1 point each)
choose the best answer. circle the letter of your choice.

1. the smallest part of an element that still has its properties is called a

a. cell b. atom c. molecule d. compound

1. which of the following is made of only one kind of atom?

a. water b. salt c. iron d. sugar

1. when two or more atoms join together, they form a.

a. mixture b. molecule c. element d. solution

1. which of these is an example of a molecule?

a. oxygen-o₂ b. salt-nacl c. water-h₂o d. both a and c

1. which of these is a compound?

a. oxygen gas (o₂) b. hydrogen gas (h₂) c. water (h₂o) d. gold (au)

1. what is the symbol for oxygen?

a. o b. ox c. oy d. om

1. it is considered as an element.

a. carbon b. carbon dioxide c. carbon monoxide d. carbohydrate

1. the periodic table shows all elements.

a. 108 b. 118 c. 128 d. 138

1. which of the following is a mixture, not a compound?

a. air b. water c. salt d. sugar

1. water has a chemical symbol of?

a. ho2 b. hho2 c. h20 d. h2o2

Explanation:

1. An atom is the smallest part of an element that retains its properties.
2. Iron is an element made of only one kind of atom.
3. When two or more atoms join, they form a molecule.
4. Both \(O_2\) (oxygen) and \(H_2O\) (water) are molecules.
5. Water (\(H_2O\)) is a compound.
6. The symbol for oxygen is \(O\).
7. Carbon is an element.
8. The Periodic Table shows 118 elements.
9. Air is a mixture.
10. The chemical symbol for water is \(H_2O\).

Answer:

1. B. Atom
2. C. Iron
3. B. Molecule
4. D. Both a and c
5. C. Water (\(H_2O\))
6. A. \(O\)
7. A. Carbon
8. B. 118
9. A. Air
10. C. \(H_2O\)