Question

1. identify each of the following being qualitative (1) or quantitative (2)

a. ___the stop sign is red and white
b. ___acids taste sour
c. ___seawaters ph has dropped from 8.23 to 8.14 in the last 250 years
d. ___the oceans water is becoming more acidic
e. ___the oceans concentration of hydrogen ions (h+) has increased 30% in the last 250 years
f. ___carbon dioxide is colorless
g. ___a molecule of carbon dioxide has a molecular mass of 44.00 amu
h. ___sunrise is getting earlier every day
i. ___i am going to study for at least 2 hours for the exam
j. ___mods 1,2 and 3 are shorter on early dismissal days

1. choose one of the answers below for each statement. answers can be used more than once!

a. physical property c. physical change
b. chemical property d. chemical change
sodium will react with water
the boiling point of water is 212°f
the acid turned the penny green
lead is very dense
the reaction between the acid and the zinc produced hydrogen gas
copper sulfate is blue
reactivity
the cobalt was attracted to the magnet

Explanation:

• Sodium will react with water: A chemical property describes a substance's ability to undergo a chemical change. Sodium reacting with water is a chemical property (B).
• The Boiling point of water is \(212^{\circ}F\): A physical property can be observed without changing the substance's chemical composition. Boiling point is a physical property (A).
• The acid turned the penny green: A chemical change results in a new substance. The penny turning green (due to a reaction) is a chemical change (D).
• Lead is very dense: Density is a physical property (A).
• The reaction between the acid and the zinc produced hydrogen gas: Production of a new substance (hydrogen gas) indicates a chemical change (D).
• Copper sulfate is blue: Color is a physical property (A).
• Reactivity: Reactivity is a chemical property (B).
• The Cobalt was attracted to the Magnet: Attraction to a magnet (a physical interaction without chemical change) is a physical property (A).

Answer:

1. Sodium will react with water - B. Chemical Property
2. The Boiling point of water is \(212^{\circ}F\) - A. Physical Property
3. The acid turned the penny green - D. Chemical Change
4. Lead is very dense - A. Physical Property
5. The reaction between the acid and the zinc produced hydrogen gas - D. Chemical Change
6. Copper sulfate is blue - A. Physical Property
7. Reactivity - B. Chemical Property
8. The Cobalt was attracted to the Magnet - A. Physical Property