Do First Actions Turn in your graph worksheet

Do First Actions: Turn in your graph worksheet into the hw drawer and take you name tent out 1. and 2. Find two things wrong with the graph below:

Agenda • Absent Policy • Metric System Notes • Metric Conversion Practice

If you are absent 1. Do not ask the teacher: “What did I miss? ” 2. Check the website: jainahs. weebly. com 3. Grab your missing worksheets from the back 4. Look at the Do First/DOL sheet in the back 5. If you are confused about something covered, then ask the teacher before class, after class, or during RISE. Do not ask during class unless it is being covered.

The Metric System And converting among units

The Metric System • The metric system is used by scientists world-wide to minimize confusion • Also known as Système Internationale d’Unités, or “SI”

The Metric System • The essence of metric to metric conversions is recognizing the base units – Length = meter (m) There are more base – Volume = liter (L) units, but these are the – Mass = gram (g) most common – Time = second (s) • Each base unit can have one of many prefixes attached to it • As with any other prefix, the prefix means the same thing regardless of the base unit it is attached to

The Metric System How to use the staircase model King Kilo- Henry Hecto- Example: Meters to centimeters Died Decka- by Base Unit (m/L/g/s) drinking deci- 1. Identify the two units you need to find an equality between chocolate centi- milk milli-

The Metric System How to use the staircase model King Kilo- Henry Hecto- Example: Meters to centimeters Died Decka- by Base Unit (m/L/g/s) 1 drinking deci- chocolate centi- milk milli- 1 2. Put a “ 1” under the “higher” unit and a “ 1” under the lower unit

The Metric System How to use the staircase model King Kilo- Henry Hecto- Example: Meters to centimeters Died Decka- by Base Unit (m/L/g/s) 1 drinking deci- chocolate centi- milk milli- 1 3. Count how many steps it takes to get to the lower unit.

The Metric System How to use the staircase model King Kilo- Henry Hecto- Example: Meters to centimeters Died Decka- by Base Unit (m/L/g/s) 1 drinking deci- chocolate centi- 10 0 4. Add that many zeros to the “ 1” under the lower unit. milk milli-

The Metric System How to use the staircase model King Kilo- Henry Hecto- Example: Meters to centimeters Died Decka- by Base Unit (m/L/g/s) 1 m drinking deci- = chocolate centi- milk milli- 10 0 C m 5. Add the units to each number and an “equals” sign between the two numbers

m 1 d 1 dm³ • Volume is the space occupied by an object • Its unit (liter) is a combination of other base units • A LITER is actually one cubic decimeter (dm³) • A milliliter is actually one cubic centimeter (cm³) ³ A Note about Volume 1 dm³

Temperature • Kelvin is the SI base unit for temperature • Zero Kelvin is a point where all particles are at their lowest possible energy state • Scientists often use the Celsius scale for ease of use • Kelvin (K) = °C + 273

Density • Density is defined as the amount of mass per unit of volume • Like volume, it is found by combining two other base units • The equation for Density is: Density = Mass / Volume

Density • Example: What is the density of an object if its mass is 13. 5 grams and its volume is 5 cm³? 3 3

Density • Example: What is the density of an object if it’s mass is 13. 5 grams and it’s volume is 5 cm³? 3 3

Density • Example: What is the density of an object if it’s mass is 13. 5 grams and it’s volume is 5 cm³? 3 3

Density • Example: What is the density of an object if it’s mass is 13. 5 grams and it’s volume is 5 cm³? 3 3

Converting among Metric Units • To convert among units, change the equalities into fractions, and arrange the fractions so that the units cancel out • Example: – How many milligrams are in 35 grams? – We know that 1 gram = 1000 mg, which is the same as writing it as – Which fraction should we use? – We want to CANCEL OUT grams and be left with milligrams

Converting among Metric Units

Converting among Metric Units

Converting among Metric Units

Converting among Metric Units • Example: – How many grams are in 35 milligrams? – We know that 1 gram = 1000 mg, which is the same as writing it as – Which fraction should we use? – We want to CANCEL OUT milligrams and be left with grams

Converting among Metric Units

Converting among Metric Units

Converting among Metric Units

Metric Conversion Practice • SHOW YOUR WORK!

DYL: Did you Learn? • 1. What is the formula for density? • 2. What is the phrase to remember for metric units?