1. Chemistry 11 Unit 2

2.  Chemistry: the study of matter and the changes that matter may undergo.  Matter: anything that has mass and volume a) Solid - Fixed shape & volume - Fixed shape & volume b) Liquid - Fixed volume - Shape of the container - Fixed volume - Shape of the container c) Gas - Shape and volume of the container - Shape and volume of the container

3. Qualitative Observations: Characteristics that can be observed without the need for calculation and measurement. eg: Colour, texture, shape. Quantitative Observations: Characteristics that requires measuring. eg: temperature, volume, mass, length Complete the Warm-up Questions on P.16

4. Discuss Scientific Method & Sources of Error on Page 17 Complete Quick Check Question 3 on Page 17

5.  Useful to express very large and very small numbers.  Consists of 2 parts: Mantissa (Decimal portion): A number between 1 and 10. (rewrite the number with the decimal after the first non-zero digit) Ordinate (Exponent portion): The base 10 raised to some power. (What you need to multiply the mantissa by) 6.022 x 10 23 mantissaordinate

6. Positive exponents = large numbers (greater than mantissa) Negative exponents = small numbers (smaller than mantissa) 3.425 x 10 6 3425000 3.425 x 10 -4 0.0003425 3.425 x 10 0 3.425 Using your calculator, solve the following without using brackets: 4.325 x 10 6 ÷ 2.46 x 10 -4 = 1.758 x 10 10

7. Your Calculator and Scientific Notation: Your Calculator should have one of the following 3 buttons to allow for entering numbers in scientific notation: ExpEEE or To enter 4.325 x 10 6 you would press the following keys: 4.325Exp EE E 6

8. To enter 2.46 x 10 -4 you would press the following keys: 2.46 (-)(-) Exp EE E 6 +/- Now try the question again! 4.325 x 10 6 ÷ 2.46 x 10 -4 = 1.758 x 10 10