Download presentation

1
**AP Chemistry Chapter I Lesson 3**

Significant Numbers

2
Giving the Cat Bath

3
Question A sample of carbon dioxide that undergoes a transformation from solid to liquid to gas would undergo (A) a change in mass (B) a change in density (C) a change in composition (D) no change in physical properties Answer B

4
**Question A solution is a(n)**

(A) compound (B) pure substance (C) homogeneous mixture of substances (D) heterogeneous mixture of substances Answer C

5
Chemical Equation Symbolic representation of the change or changes occurring. sodium bicarbonate + hydrochloric acid Sodium chloride + water + carbon dioxide

6
Reactant Substances reacting to produce product.

7
Product Substances that are produced. iron + oxygen Iron III oxide

8
Example 2 Na + Cl2 2 NaCl Reactants Product

9
Accuracy How close is measurement to the true value.

10
Precision Agreement between several measurements of some quantity.

11
**Ions electrically charged atoms or groups of atoms. Cations (+)**

charged ions Anion (-) charged ions

12
Convert 7 in to cm 17.8 cm

13
Convert 179 m to cm 1.790 x 104 cm

14
Convert 15 km/L to mi/gal 35 mi /gal

15
**Calculation of significant figures**

Preceding zeros do NOT count. Ex: is 2 sig #’s Zero between non zero digits count. Ex: is 6 sig #’s

16
**Calculation of significant figures cont.**

Trailing zeros do NOT count. Ex: 100 is 1 sig # Zeros behind the decimal after a non zero digit DO count. Ex: 1.00 x 102 is 3 sig #’s

17
Answer Significant # for A B 6 sig # 6 sig #

18
Answer Significant # for: A B 3 sig # 1 sig #

19
**Rules for Significant figures in multiplying and dividing.**

Ex: 4.56 x 1.4 = 6.38 round to 6.4 use the number that has the least number of significant figures. Due to the least precise number.

20
**Rule for significant figures and addition and subtraction.**

Ex: round to nearest tenth due to digit with least precise measurement. So correct answer would be 31.1 due to (18.0).

21
Mass Amount of matter in an object.

22
Volume 1 L = 1000ml = 1000 cm3 = 1 dm3

23
Temperature property of matter that determines whether heat energy can be transferred from one body to another and the direction of that transfer.

24
**Formulas: a. Convert oF to o C (o F - 32) x 5/9 = o C**

b. Convert o C to o F o C x 9/ = o F Celsius Fahrenheit

25
**Formulas: c. Convert o C to K o C + 273.15 = K or K - 273.15 = o C**

Lord Kelvin

26
Absolute Zero lowest possible temperature. Where all motion of molecules ceases.

Similar presentations

OK

CHEMISTRY 1211 Chapter 1. CHEMISTRY WHAT IS IT? SCIENCE DEALING WITH THE COMPOSITION AND ENERGY OF MATTER AND THE CHANGES IN COMPOSITION AND ENERGY THAT.

CHEMISTRY 1211 Chapter 1. CHEMISTRY WHAT IS IT? SCIENCE DEALING WITH THE COMPOSITION AND ENERGY OF MATTER AND THE CHANGES IN COMPOSITION AND ENERGY THAT.

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Download ppt on oxidation and reduction definition Ppt on data collection methods for research Ppt on panel discussion sample Easy ppt on artificial intelligence Ppt on glasgow coma scale Free download ppt on minerals and energy resources Ppt on 5 elements of earth Ppt on origin of life Strategic management ppt on nestle Glass fiber post ppt online