test review 1a (2014-2015) the practice of chemistry

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

297285-59-73