Download presentation

Published byAlfredo Holbert Modified over 6 years ago

1
**Ch. 2 - Measurement I. Units of Measurement (p.34-45)**

Number vs. Quantity SI Base Units & Prefixes Derived Units Density Calculations

2
A. Number vs. Quantity Quantity - number + unit UNITS MATTER!!

3
**B. SI Units Base Unit Length- I meter m Mass- m gram g Time- t second**

Quantity & Symbol Base Unit Unit Symbol Length- I meter m Mass- m gram g Time- t second s Temp- T kelvin K Current- I ampere A

4
**B. SI Units Prefix Factor mega- M 106 kilo- k 103 deci- d 10-1 centi-**

Pre- Symbol Factor mega- M 106 kilo- k 103 deci- d 10-1 centi- c 10-2 milli- m 10-3 micro- 10-6 nano- n 10-9 pico- p 10-12

5
**D m V D= m V C. Derived Units Combination of base units.**

Volume - length length length 1 cm3 = 1 mL dm3 = 1 L Density - mass per unit volume (g/cm3) D m V D= m V

6
Problem Solving Steps 1 Givens: 2 Unknowns: 3 Equations: 4 Answer:

7
**D m V D. Density V = 825 cm3 m = DV D = 13.6 g/cm3**

An object has a volume of 825 cm3 and a density of 13.6 g/cm3. Find its mass. GIVEN: V = 825 cm3 D = 13.6 g/cm3 m = ? WORK: m = DV m = (13.6 g/cm3)(825cm3) m = 11,220 g D m V

8
**Problem Solving Steps 1 Givens:**

Include quantity, number, & unit symbols 2 Unknowns: Include quantity & unit symbols 3 Equations: Base equation & manipulated equation 4 Answer: Do the units agree? Is it reasonable?

9
**D m V D. Density D = 0.87 g/mL V = m V = ? m = 25 g V = 25 g 0.87 g/mL**

1) A liquid has a density of 0.87 g/mL. What volume is occupied by 25 g of the liquid? GIVEN: D = 0.87 g/mL V = ? m = 25 g WORK: V = m D D m V V = g 0.87 g/mL V = 28.7 mL

10
**D m V D. Density m = 620 g D = m V = 753 cm3 D = ? D = 620 g 753 cm3**

2) You have a sample with a mass of 620 g & a volume of 753 cm3. Find density. GIVEN: m = 620 g V = 753 cm3 D = ? WORK: D = m V D m V D = g 753 cm3 D = 0.82 g/cm3

Similar presentations

© 2022 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google