Chapter 1: The Study of Change Dr. Nouf Alotaibi

Which of the following would NOT be a physical change? freezing water to make ice cubes. melting gold to make jewelry. burning a piece of paper. tearing a piece of aluminum foil. Which of the following would be a chemical change? perfume evaporating on your skin. melting butter for popcorn. burning sugar.  a hot glass breaking when placed in cold water.

Which of the following is an example of a physical property? A) Combustibility B) Corrosiveness C) Explosiveness D) Density Which of the following would NOT be an extensive property? volume of a substance in beaker. mass of a soccer ball. boiling point of water. length of a class room.

What is the SI unit of mass? A) Meter B) Centimeter C) Gram D) Kilogram (kg) The symbol for density in SI system is: m3/s kg kg/m3 g/ml  

Convert 240 K and 468 K to the Celsius scale. A) 513oC and 741oC B) -59oC and 351oC C) -18.3oC and 108oC D) -33oC and 295oC

Calculate the volume occupied by 4. 50 X 102 g of gold (density = 19 Calculate the volume occupied by 4.50 X 102 g of gold (density = 19.3 g/cm3). A) 23.3 cm3 B) 8.69 x 103 cm3 C) 19.3 cm3 D) 450 cm3 The melting point of bromine is -7 oC. What is this melting point expressed in oF? A) 45 oF B) -28 oF C) -13 oF D) 19 oF

The number of significant figures in 0.053 is 1 4 2  What is the Scientific form for 3,500,000,000 3.5x109 3x109 3.5x108 3.50x109

How many significant figures are there in the measurement 3.4080 g? B) 5 C) 4 D) 3 E) 2 Multiply (4x 105) (6.2x107) 2.48 x 1013

3.57096 x 105 5.600 x 10-3 Convert 357,096 to Scientific Notation

Given: 2.46 x 106 + 3.476 x 103 Shift decimal 3 places to the left for 103. Move: 0.003476 x 103+3 Add: 2.46 x 106 + .003476 x 106 Answer: 2.463 x 106

Given: 5.762 x 103 – 2.65 x 10-1 Shift decimal 4 places to the right for 10-1. Move: 0.000265 x 10(-1+4) Subtract: 5.762 x 103-.000265 x 103 Answer: 5.762 x 103

5.4 x 106 Evaluate: 9.0 x 102 5.4 ÷ 9.0 = 0.6 106 ÷ 102 = 104 0.6 x 104 6.0 x 103 1. Divide the coefficients 2. Divide the powers of ten 3. Combine those results 4. Put in proper form

Practice Rule #1 Zeros 6 3 5 2 4 All digits count Leading 0’s don’t Trailing 0’s do 0’s count in decimal form 0’s don’t count w/o decimal 0’s between digits count as well as trailing in decimal form 45.8736 .000239 .00023900 48000. 48000 3.982106 1.00040

Addition and Subtraction Look for the last important digit .71 82000 .1 .56 + .153 = .713 82000 + 5.32 = 82005.32 10.0 - 9.8742 = .12580 10 – 9.8742 = .12580 __ ___ __

Multiplication and division 32.27  1.54 = 49.6958 3.68  .07925 = 46.4353312 1.750  .0342000 = 0.05985 3.2650106  4.858 = 1.586137  107 6.0221023  1.66110-24 = 1.000000 49.7 46.4 .05985 1.586 107 1.000