Chemistry Quiz 1 Lab Safety/equipment

How do you go from Celsius to Fahrenheit

(x*1.8) +32

How do you go from Fahrenheit to Celsius

(x-32)/1.8

Convert 11.5°F

-11.4

Convert −273.15°C

-459.67

Convert −20.92°C

-5.67

57.9 kg/m3 to g/cm3

.0579

923 mL to liters

.923

How many significant figures in 0.0000003 cm

1

A 6.0−ft person weighs 166 lb. Express this person's height in meters and weight in kilograms(1 lb = 453.6 g; 1 m = 3.28 ft).

1.8 M 75.2976 KG

How many significant figures in 4.6 x 1019

2

Carry out the following conversion and report the answer using scientific notation. 59.7 millimeters per second to kilometers per hour

2.15 x 10-1 km/hr

If the average speed of a helium atom at a certain temperature is 1290 m/s, what is the speed in miles per hour? (1 mi = 1609 m)

2.886 x 10^3

A piece of platinum metal with a density of 20.8 g/cm3 has a volume of 6.98 cm3. What is its mass? Round your answer to the nearest gram

20.8 g/cm3 = m/6.98cm3 6.98cm3 x 20.8 g/cm3 = M M= 145.184g answer: 145.18

How many Significant figures in 40.2g

3

Convert 96.9°F

36.1

Convert 102.1°F

38.9

How many Significant figures in 60,104 tons

5

The following procedure was used to determine the volume of a flask. The flask was weighed dry and then filled with water. If the masses of the empty flask and filled flask were 43.68 g and 99.02 g, respectively, and the density of water is 0.9976 g/cm3, calculate the volume of the flask in cm3.

55.47 cm^3

85.3 m to decimeters

853

Convert 1645°F

896

Carry out the following conversion and report the answer using scientific notation. 56.35 miles to centimeters

9.07 x 10^9 cm

99.5 mg to kilograms

9.95 x 10^-5

The density of ammonia gas under certain conditions 0.650 g/L. Calculate its density in g/cm3.

Converstion unit 1L = 1000cm^3 .000650 g/cm^3

What is the equation for finding Density?

D=m/v

The density of lithium(Li), is 5.34 × 102 kg/m3. Convert the density to g/cm3

Kilograms = 1 x 10^3 10^2-10^3= 10^-1 answer = 5.34 x 10^-1 g/m^3

Three apprentice tailors (X, Y, and Z) are assigned the task of measuring the seam of a pair of trousers. Each one makes three measurements. The results in inches areX (32.5, 32.6, 32.4); Y (33.8, 33.3, 33.7); Z (32.9, 33.2, 33.1). The true length is 33.0 in. Comment on the precision and the accuracy of each tailor's measurements.

Most Accurate Tailor Z Least Accurate Tailor Y Most Precise Tailor X Least Precise Tailor Y

Which of the following statements describe chemical properties? Oxygen gas supports combustion. Hydrofluoric acid reacts with glass. Fertilizers help to increase agricultural production. Water boils below 100°C on top of a mountain. Lead is denser than aluminum.

Oxygen gas supports combustion. Hydrofluoric acid reacts with glass. Fertilizers help to increase agricultural production.

Precision vs. Accuracy

Precision is how close results are to each other Accuracy is how close the results are to the known value

What are significant figures?

Significant figures are the valid digits in a measurement.

In determining the density of a rectangular metal bar, a student made the following measurements: length, 8.53 cm; width, 2.4 cm; height, 1.0 cm; mass, 52.7064 g. Calculate the density of the metal to the correct number of significant figures.

V=LWH D=m/v 2.6 g/cm^3 (use least sig figs)

How would you classify sodium chloride (table salt)? element heterogeneous mixture homogeneous mixture compound

compound

Cu copper cesium carbon

copper

F phosphorus francium fluorine

fluorine

How would you classify a soft drink in a sealed bottle? heterogeneous mixture compound homogeneous mixture element

homogeneous mixture

Li lutetium lanthanum lithium

lithium

P lead platinum phosphorus

phosphorus