Unit 1 Homework PDF
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This document appears to be homework or classwork covering basic chemistry concepts including elements, compounds, mixtures, and properties of matter, likely for high school students. It includes several questions and a table with physical properties of various substances. The document also includes some Regents Practice questions.
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UNIT 1 HOMEWORK I) 1. Classify each of the following with the combination of terms listed below. pure substance – element mixture – homogeneous pure substance – compound mixture –heterogeneous i.) HCl (aq) mixture – homogeneous ii). C11H22O11 (s) pure substance – compou...
UNIT 1 HOMEWORK I) 1. Classify each of the following with the combination of terms listed below. pure substance – element mixture – homogeneous pure substance – compound mixture –heterogeneous i.) HCl (aq) mixture – homogeneous ii). C11H22O11 (s) pure substance – compound iii). KBr (s) pure substance – compound iv). Soil v). Cl2 (g) vi). CH2(OH)2 (aq) vii). Na (s) 2. Which of the following is a pure substance element? a. ocean water b. vanilla ice cream c. a diamond pure element d. quartz crystals pure compound 3. True or False: The identity of a pure substance will change when it is melted or frozen. II) REGENTS PRACTICE 1 UNIT 1 HOMEWORK 2 UNIT 1 HOMEWORK 1. Explain why water is considered a pure substance, while milk is not. 2. List at least three physical properties of silver. 3. Give an example of an extensive property and an intensive property of an iron nail. Explain. 4. Compare the arrangements of particles in the three states of matter. 5. The odor of gasoline is very strong and distinctive. Can gasoline in the gaseous state be referred to as a vapor? Explain. 6. Describe how the sharpening of a pencil is a different type of physical change than dissolving some sugar in water 3 UNIT 1 HOMEWORK Use the Data below to answer the following questions. 7. What is the physical state of each of the following substances at room temperature? a. oxygen b. iron c. mercury 8. What is the name of the physical change that occurs in each of the following instances? a. Oxygen is cooled from -150°C to -200°C. b. Iron is cooled from 1600°C to 1500°C. c. Mercury is heated from -130°C to -100°C. 9. Which colorless substance is a solid at -50°C? 10. Which substance is a liquid at 1000°C? 11. Which substance condenses from a gas to a liquid as the temperature is cooled from 20°C to -50°C? Properties of Substances Substance Color Melting Point (°C) Boiling Point (°C) Bromine red-brown -7 59 Chlorine yellow-green -101 -34 Gold yellow 1064 2856 Iron silver 1538 2862 Mercury silvery-white -117 78 Nitrogen colorless -210 -196 Oxygen colorless -219 -183 Sodium chloride white 801 1413 Water colorless 0 100 4
