1. DO-NOW
The density of osmium, which is the densest metal, is g/cm3. What is the mass of a block of osmium that measures 1.00cm x 4.00cm x 2.50cm?
A students measures the mass of an object to be g. The accepted mass of the object is g. What is the students percent error?
Write in scientific notation
Write x 104 in numerical (Standard Notation)

2. DO-NOW
The density of osmium, which is the densest metal, is g/cm3. What is the mass of a block of osmium that measures 1.00cm x 4.00cm x 2.50cm?
A students measures the mass of an object to be g. The accepted mass of the object is g. What is the students percent error?
What is the sum of and 88.2?
What is the product of and 56.20?

3. Temperature Scales Temperature
A measure of how hot or cold something is
Heat moves from the object at the higher temperature to the object at the lower temperature
Scientists commonly use two equivalent units of temperature, degree Celsius (ºC) and kelvin (K)

4. Celsius (ºC) Temperature Scale Kelvin (K) Temperature Scale
The Celsius scale sets the freezing point of water at 0°C and the boiling point of water at 100°C
Kelvin (K) Temperature Scale
Known as the absolute scale
Freezing point of water is K and the boiling point is K

5. Comparing the ºC and K Temperature Scales
The zero point on the Kelvin scale, 0 K, or absolute zero, is equal to –273.15°C
Celsius
Kelvin
100
divisions
100°C
Boiling point
of water K
0°C
Freezing point K

6. Converting Between ºC and K
Add or subtract 273, to convert between Celsius and Kelvin scales, as shown in the following equations:
K = °C + 273
°C = K – 273

7. PRACTICE PROBLEM:
Normal human body temperature is 37°C. What is this temperature in kelvins?

8. PRACTICE PROBLEM
A student if performing an experiment and measures the temperature of water to be 350 K. What is the temperature of the water in ºC?

9. TEMPERATURE SCALES PRACTICE

10. Chapter 3.3 DIMENSIONAL ANALYSIS
(From a measurement with one unit to an equivalent measurement with different units)

11. Commonly Used Metric Prefixes
Factor
Kilo (k)
10 3 (1000)
Hecto (h)
(100)
Deca (D)
10 1 (10)
gram, liter, meter (g,l,m)
BASE UNITS
Deci (d)
10-1 (1/10)
Centi (c)
(1/100)
Milli (m)
10-3 (1/1000)

12. A conversion factor is a ratio of equivalent measurements
The two components of a conversion factor are equivalent measurements with different units...two ways of expressing the same quantity
When a measurement is multiplied by a conversion factor, the numerical value is usually changed, but the actual size of the quantity measured remains the same

13. Dimensional analysis is a way to analyze and solve problems using the units, or dimensions, of the measurements
Useful for solving conversion problems
Example #1: How many minutes are in 5.5 hours?
Example #2: How many meters(m) are in 80 centimeters(cm)?

14. Example #3: How many seconds are in a workday that lasts exactly eight hours?
Example #4: How many centimeters (cm) are in 505 kilometers?

15. Example #5: The directions for an experiment ask each student to measure 1.84 g of copper (Cu) wire. The only copper wire available is a spool with a mass of 50.0 g. How many students can do the experiment before the copper runs out?

16. Example # 6: The diameter of a sewing needle is 0. 073 cm
Example # 6: The diameter of a sewing needle is cm. What is the diameter in millimeters?

17. Example #7: The mass of these peppers was determined to be grams . What is the mass of the peppers in kilograms (kg)?