warm-up (8/21) classify carbon dioxide (co 2 ) and oxygen gas (o 2 ). be specific. due tomorrow:...
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What is Chemistry? Describing Matter Density Unit Conversion Classifying MatterTRANSCRIPT
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Warm-Up (8/21) Classify carbon dioxide (CO2) and
oxygen gas (O2). Be specific. Due Tomorrow:
•Homework #3: P. 28 #6-7•Homework #2: Describing Matter Worksheet (Half-page) •Homework #1: Page 19 #2, 4, 7•Warm-Ups (8/18 – 8/21) 4 minimum
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What is Chemistry?
Describing Matter Density Unit
ConversionClassifying
Matter
10 10 10 10 10
20 20 20 20 20
30 30 30 30 30
40 40 40 40 40
50 50 50 50 50
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What is Chemistry - 10
•Which state of matter has a defined volume, but takes the shape of its container?
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What is Chemistry – 10
•Liquid
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What is Chemistry - 20
•What is chemistry?
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What is Chemistry – 20
•Chemistry is the study of matter (and the ways in which it interacts, combines, and changes)
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What is chemistry- 30
•What is a chemical? (Exact definition)
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What is chemistry– 30
•Any substance with a definite composition
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What is chemistry- 40
•What are the two types of change in matter and list 2 examples of each.
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What is chemistry– 40
• Physical – Melting, freezing, evaporation, sublimation, etc…
• Chemical – light emission, combustible, color change, iron rust, odor change
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What is chemistry- 50
• Your friend mentions she eats only natural foods because she wants her food to be free of chemicals. Is she right? Why or why not?
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What is chemistry– 50
•Her reasoning is WRONG! All matter, including natural foods, is made of chemicals.
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Describing matter- 10
•All matter must have two physical properties. What are they?
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Describing matter– 10
•All matter has mass and volume.
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Describing matter- 20
•Explain the difference between mass and weight.
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Describing matter– 20
• Mass is a measure of the amount of matter in an object
• Weight is a measure of the gravitational force on an object
• Weight can vary with location in the universe, whereas mass will remain the same
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Describing matter- 30
• In chemistry, we use _______________ to convert a measurement from one unit to the another.
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Describing matter– 30
•Conversion factors/ dimensional analysis
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Describing Matter- 40
•Is burning a candle a physical or chemical change? Explain.
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Describing Matter– 40
•Burning a candle is a chemical change. The wick becomes black and gases are released along with energy (light & heat)
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Describing matter- 50
• Describe three common physical properties between salt and sugar. What is one physical property used to distinguish the two (NOT taste)
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Describing Matter– 50
•White, crystal, solids, soluble in water
•Density of salt is different from the density of sugar
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Density- 10
•What is density?
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Density– 10
•Density is the ratio of a mass of a substance to the volume of the substance
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Density- 20
• What are the three most common units of volume that may be used to express density?
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Density– 20
•Liters, milliliters, cm3
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Density- 30
•What is the density of a substance that has a mass of 38 grams and occupies 152 mL?
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Density– 30
•0.25 g/mL
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Density - 40
•A substance has a density of 6 g/cm3. The substance has a mass of 72 grams. How much space does this substance occupy?
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Density– 40
•12 cm3
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Density- 50
•What is the mass of a cube with a height of 5 cm and density of 4 g/ cm3 ?
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Density– 50
•500 grams
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Unit Conversion- 10
•Convert 3000 mL to Liters.
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Unit Conversion– 10
•3 Liters
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Unit Conversion- 20
•How many minutes are in two days?
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Unit Conversion– 20
•2880 minutes
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Unit Conversion- 30
•Convert 17.3 cm3
to Liters.
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Unit Conversion– 30
•0.0173 Liters
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Unit Conversion - 40
•How many seconds are in one week?
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Unit Conversion– 40
•604,800 seconds
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Unit Conversion - 50
•Show that kg/L and g/cm3 are equivalent units of density
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Unit Conversion– 50
•Kg/L x 1000g/kg x 1 L/1000mL x 1mL/1cm3
•= 1 g/cm3
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Classifying Matter- 10
• List two different compounds
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Classifying Matter– 10
•Sugar, water, H2O, NaCl, KCl, CO2
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Classifying Matter- 20
•Classify the molecule S8 and sugar water. (be Specific)
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Classifying Matter– 20
•the molecule S8 is an element and sugar water is a homogenous mixture
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Classifying Matter- 30
•Explain the difference between a compound and a mixture.
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Classifying Matter– 30
•A compound is chemically combined, whereas a mixture is physically combined.
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Classifying Matter- 40
• Classify the ocean. Explain your reasoning.
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Classifying Matter– 40
• It can be both, so it depends on your POV• Homogenous – the ocean is essentially
made of salt and water everywhere in the world
• Heterogenous – if you look at the sand and ocean water (say on a beach) then sand + water is a heterogenous mixture
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Classifying Matter- 50
• Identify two foods/drinks and label one as homogenous and the other heterogenous. Expain your choices
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Classifying Matter– 50
•Pizza – heterogenous•Gatorade - homogenous