The Atom Worksheet Template (With Answers)
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1
2Name:______________________Date:_______________________Period: _____________________
Unit 1: The Atom
Homework #1
Directions: Circle the correct answer. Explain your reasoning on a separate sheet of paper. Attach the
separate sheet with you explanations to this sheet.
1. Which pair are classified as chemical substances?
a. Mixtures and solutions
b. Compounds and solutions
c. Elements and mixtures
d. Compounds and elements
A chemical substance is matter which has a specific composition and specific properties. Every pure
element is a substance. Every pure compound is a substance.
2. Which of the following substances cannot be decomposed by chemical change?
a. Sulfuric acid
b. Ammonia
c. Water
d. Argon
Argon is an element. The other choices are compounds. Elements can be broken down into simpler
components.
3. Which substances can be decomposed by a chemical change?
a. Beryllium
b. Boron
c. Methanol
d. Magnesium
Methanol is a compound composed of carbon, hydrogen, and oxygen. Compounds can be broken down
into their componenets by chemical means. The other choices are elements.
4. Which substances can be decomposed chemically (by chemical means)?
a. CaO and Ca
b. MgO and Mg
c. CO and Co
d. CaO and MgO
CaO and MgO are both compounds. In the other choces the first substance is a compound and the
second substance is an element.
5. Which formula represents a binary compound?
a. Ne
b. Br
2
c. C
H
3
8
d. NaOH
A binary compound is a compound composed of only 2 different elements in fixed portions. C
H
3
8
(propane) is composed of carbon and hydrogen.
6. Given the equation:
O 2NaOH + H
2Na + 2H
O
2
2
which substance in this equation is a binary compound?
a. Na
b. H
2
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