test review 1a (2014-2015) the practice of chemistry
TRANSCRIPT
TEST
REVIEW
1A (2
014-
2015)T
HE
PR
AC
TI C
E O
F CH
EM
I ST
RY
LAB EQUIPMENT
Flask
Goggles
WHAT IS THIS?
Beakers
Flask
Test tubes
PIPPETTE
Crucible Tongs
NAME THE FOLLOWING
A
B
C
DFlask
Test Tube E
Test tube rack
Graduated Cylinder
Beaker
WHAT IS THE THE ORDER OF THE STEPS OF THE SCIENTIFIC METHOD
1.Observation2.Hypothesis3.Experiment4.Data collection5.Conclusion
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
DENSITY
What is the mass of a 100 milliliter sample of water?
Remember the density of water is 1 g/cm3
100grams
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
A _____________observation is one that can be made without measurement
Qualitative
A ____________ observation is one that uses measurementQuantitative
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
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
METRIC CONVERSION
Convert 6000 mg to cgConvert 400 Liters to mLConvert 2.5 m to km
K H Dk base d c m
600 cg400000 mL0.0025 km
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 86.12 mL. What is the density of the copper sample?
8.93g/mL
86.12mL – 85mL=1.12mL
10g /1.12mL=
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?
=5.69 g/cm3
16.3 grams
1.42 X 1.42 X 1.42=2.86 cm3
2.86 cm3
DIMENSIONAL ANALYSIS
How many eggs are in 4 dozen
4dozen x 12eggs/1 dozen = 48 eggs
• Percent error is the ratio of an error to an accepted value.
Percent error
Percent error = actual – experimental actual
X100
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/cm3 - 2.50 g/cm3 X 100 =20% 2.50 g/cm3 0.5 g/cm3
2.50 g/cm3 X 100 = 20%
=3.50%
What is the percent error if a measured value is 24.59 g/mL and the accepted value is 25.49 g/mL?
25.49-24.59= 0.925.49
X100
DIMENSIONAL ANALYSIS
How many minutes are in 4 days
4 days X 24 hours/1 day X 60 minutes/1 hour = 5,760 minutes
LAB SAFETY
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?
300g -160g= 140g m
D V140 g/75 ml=
1.9g/mL
Weird 11
ELEMENT: WHAT IS THE SYMBOL AND NAME
47Ag
Silver
ELEMENT: WHAT IS THE SYMBOL AND NAME
26Fe
Iron
ELEMENT: WHAT IS THE SYMBOL AND NAME
51Sb
Antimony
ELEMENT: WHAT IS THE SYMBOL AND NAME
80
MercuryHg
ELEMENT: WHAT IS THE SYMBOL AND NAME
79Au
Gold
ELEMENT: WHAT IS THE SYMBOL AND NAME
82Pb
Lead
ELEMENT: WHAT IS THE SYMBOL AND NAME
Tungsten
74W
ELEMENT: WHAT IS THE SYMBOL AND NAME
11Na
Sodium
ELEMENT: WHAT IS THE SYMBOL AND NAME
19K
Potassium
ELEMENT: WHAT IS THE SYMBOL AND NAME
29
CuCopper
ELEMENT: WHAT IS THE SYMBOL AND NAME
50Sn
Tin
•The freezing point in Celsius is ____ and the boiling point is ______
0
100
273K
•On the Kelvin scale, water freezes at about _____ and boils at about ____ K.
373
CONVERT THE FOLLOWING
24oC = _____K12oC = _____K214K = _____oC200K = _____oC
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