Name: _________________________________ Date: _____________ Period: ____ Chapters 2 and 3 Test Test: Wednesday, 10/24 Chapter 2 1. Know the differences between mass and weight Mass: stays constant, measured in grams, measurement of amount of matter in an object Weight: can change, measured in Newtons, measurement of gravitational force 2. Know how to calculate density and know what units to use. Know if something will float in water. Density = mass divided by volume Units: g/cm3 or g/mL Water has the density of 1.00 g/cm3. If the object is less dense (less than 1) it will float. 3. Know where the densest layer in a graduated cylinder would be. The densest layer would be at the bottom. The least dense would float on top. 4. Know the physical and chemical properties of matter. Physical: Solubility, thermal conductivity, malleability, volume, mass, weight, density, ductility Chemical: flammability, reactivity 5. Be able to identify a physical change vs. a chemical change. Know at least four examples of physical changes. Physical changes: matter retains its identity (ripping, crumpling, freezing, melting, changing container Chemical change: permanent change 6. Know the 6 signs of a chemical change. Gas produced (bubbles), odor, temperature change, permanent color change, substance disappears, solid is formed 7. Know the procedure for measuring the volume of an irregular solid. Take a graduated cylinder and fill it with an amount of water, measure the volume of water. Place irregular solid in the water and measure the difference. The difference is the volume of the irregular solid. Chapter 3 1. Know what has to happen to the particles in a solid to become a liquid; a liquid to a gas; solid to a gas; liquid to a solid; gas to a liquid Solid to liquid, liquid to gas, solid to gas add energy Liquid to solid, gas to liquid take away energy 2. Know how atoms/molecules interact. Atoms and molecules are constantly moving and colliding with each other. They are also attracted to each other. 3. Be able to discuss why liquids can flow (hint: talk about their particles) Their particles can slide past each other, unlike in a solid. 4. Know what needs to happen to slow or speed up particles of matter. You must add energy or increase temperature to speed up particles You must take away energy or decrease temperature to slow down particles. 5. Know Boyle’s and Charles’ Laws and what they explain. Boyle’s Law: volume is inversely related to pressure (when one goes up, the other will decrease) Charles’ Law: temperature and volume are directly related (when one increase, the other will also increase) 6. Know the relationship between the volume and pressure of a gas. When the volume increases, the pressure decreases. When the volume decreases, the pressure increases. 7. USE NOTES, VOCABULARY, HOMEWORK, DO NOWS and LABS to study!