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The Practice of Chemistry
Test Review 1A ( ) The Practice of Chemistry
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Lab Equipment Goggles Flask
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What is this? Beakers
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Flask
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Test tubes
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Crucible Tongs Pippette
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A D B E C Flask Graduated Cylinder Test Tube Beaker Test tube rack
Name the following A D Flask Graduated Cylinder B E Test Tube Beaker C Test tube rack
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What is the The Order of the steps of the scientific method
Observation Hypothesis Experiment Data collection Conclusion
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Density A bottle contains 100 mL of a liquid. The total mass of the bottle and the liquid together is 250 g. The mass of the empty bottle is 50 g. What is the density of the liquid? Formula d=m/v 200g /100 mL=2.0 g/mL
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Density What is the mass of a 100 milliliter sample of water? Remember the density of water is 1 g/cm3 100grams
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Density A sample has a mass of 50 grams and a volume of 25 cm3. What is the density? 50 g /25 cm3 = 2 g/cm3 The same sample is cut in half. It has a mass of 25 grams and a volume of 12.5 cm3. What is the density? 25 g /12.5 cm3 = 2 g/cm3
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Qualitative A _____________observation is one that can be made without measurement
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Quantitative A ____________ observation is one that uses measurement
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Chemistry and Matter: Basic Concepts
Identify each of the following as either a qualitative or quantitative observation. A. The density of water is 1.0 g/mL Quantitative B. An base has a bitter taste Qualitative
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Chemistry and Matter: Basic Concepts
Identify each of the following as either a qualitative or quantitative observation. A. The mass of the rock is 25 grams. Quantitative B. A leaf has a green color. Qualitative
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Metric conversion Convert 6000 mg to cg Convert 400 Liters to mL Convert 2.5 m to km K H Dk base d c m 600 cg mL km
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A vessel contains 85 mL of water. A sample of 10
A vessel contains 85 mL of water. A sample of 10.0 g of copper metal is dropped into this vessel, raising the level of water in it to mL. What is the density of the copper sample? 86.12mL – 85mL=1.12mL 10g /1.12mL= 8.93g/mL
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A cube of metal is 1. 42 centimeters on an edge. It has a mass of 16
A cube of metal is 1.42 centimeters on an edge. It has a mass of 16.3 grams. What is the density of this metal? 1.42 X 1.42 X 1.42=2.86 cm3 16.3 grams 2.86 cm3 =5.69 g/cm3
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How many eggs are in 4 dozen
Dimensional analysis How many eggs are in 4 dozen 4dozen x 12eggs/1 dozen = 48 eggs
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Percent error = actual – experimental actual X100 Percent error
Percent error is the ratio of an error to an accepted value. Percent error = actual – experimental actual X100
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Calculate the percent error.
The density of an object is 3.00 g/cm3. Does it sink or float? Sink because greater than 1.0 g/cm3 The accepted value of density is 2.50 g/cm3. Calculate the percent error. 3.00 g/cm g/cm3 X 100 =20% 2.50 g/cm3 0.5 g/cm3 X 100 = 20%
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What is the percent error if a measured value is 24
What is the percent error if a measured value is g/mL and the accepted value is g/mL? = 0.9 X100 25.49 =3.50%
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How many minutes are in 4 days
Dimensional analysis How many minutes are in 4 days 4 days X 24 hours/1 day X 60 minutes/1 hour = 5,760 minutes
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Lab safety
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A bottle contains 75 mL of a liquid
A bottle contains 75 mL of a liquid. The total mass of the bottle and the liquid together is 300 g. The mass of the empty bottle is 160 g. What is the density of the liquid? m D V 300g -160g= 140g 140 g/75 ml= 1.9g/mL
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Weird 11
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Element: What is the Symbol and name
47 Ag Silver
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Element: What is the Symbol and name
26 Fe Iron
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Element: What is the Symbol and name
51 Sb Antimony
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Element: What is the Symbol and name
80 Hg Mercury
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Element: What is the Symbol and name
79 Au Gold
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Element: What is the Symbol and name
82 Pb Lead
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Element: What is the Symbol and name
74 W Tungsten
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Element: What is the Symbol and name
11 Na Sodium
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Element: What is the Symbol and name
19 K Potassium
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Element: What is the Symbol and name
29 Cu Copper
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Element: What is the Symbol and name
50 Sn Tin
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The freezing point in Celsius is ____ and the boiling point is ______
100
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On the Kelvin scale, water freezes at about _____ and boils at about ____ K.
373
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Convert the following 297 24oC = _____K 12oC = _____K 214K = _____oC 200K = _____oC 285 -59 -73
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