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Chapter 2

Chapter 2. Matter and Energy Pg 38 - 69. Measurement. Measuring matter Mass – how much matter is in an object Volume – how much space an object takes up Weight – how much gravity is on an object Density – amount of mass in a certain volume. Units. All numbers need units

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Chapter 2

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  1. Chapter 2 Matter and Energy Pg 38 - 69

  2. Measurement • Measuring matter • Mass – how much matter is in an object • Volume – how much space an object takes up • Weight – how much gravity is on an object • Density – amount of mass in a certain volume

  3. Units • All numbers need units • All numbers need units • All numbers need units

  4. Units • Mass – measured in grams • mg, cg, dg, g, Dg, Hg, Kg • Volume – measured in cm3 or liters • mm3, cm3, m3, ml, cl, dl, L, DL, HL, KL • Density – measured in mass over volume • g , g , g , mg , mg , Kg , Kg cm3 ml L mm3 ml m3 L

  5. Metric system and International system (SI) • Length – Meter • Mass – Kilogram • Temperature – Kelvin • Amount of substance – Mole • Kilo, Hecto, Deca, (g, m, L), deci, centi, milli

  6. Energy • All physical and chemical changes involve a change in energy • Energy goes in or energy comes out. • If energy goes in it is endothermic • Ice melting • If energy comes out it is exothermic • Water freezing, paper burning

  7. Energy • Law of conservation of energy • Energy cannot be created or destroyed • It can only change form from one type to another

  8. Heat • Heat is a form of energy • Heat is the amount of particle movement • The faster the particles move, the more heat there is • Heat makes the particles move faster • Kinetic energy is the energy of movement • Heat is the amount of kinetic energy the particles have

  9. Temperature • Different scales • We use Celsius and Kelvin • We use Kelvin in all calculations • K = oC + 273

  10. Scientific Notation • 602,000,000,000,000,000,000,000 is a very important number in chemistry • 6.02 x 1023 atoms in 1 mole of any substance • 0.00000000000000000000000001673 kg is the mass of 1 atom • 1.673 x 10-27 kg

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