Chemistry Unit 0

1. What is matter? – anything that has mass or takes up space 2. What is the difference between mass and weight? Mass is the amount of matter in an object, weight is gravity’s effect on that mass 3. What is density? – the amount of mass contained in a certain amount of volume 4. If an object has a mass of 25 g and a volume of 75.0 mL, what is its density? .33 g/mL 5. If an object has a density of 2.00 g/mL and a volume of 52.5 mL, what is its mass? 104 g 6. If an object has a density of 15 g/mL and a mass of 25 g, what is its volume? 1.7 mL 7. Give 2 examples of a physical property. Length, mass, density, etc. 8. Give 2 examples of a chemical property. Flammability, react to acid, rust, etc 9. Give 2 examples of a chemical change. Burning, tarnishing, rusting, etc 10. Give 2 examples of a physical change. Cutting, melting, freezing, etc. 11. What is a homogenous mixture? A combination of 2+ substances that is evenly mixed/spread out 12. Give 2 examples of a homogeneous mixture. Air, brass, salt water, etc 13. What is a heterogeneous mixture? A combination of 2+ substances that is not even mixed/spread out 14. Give 2 examples of a heterogeneous mixture. Pizza, Italian salad dressing, etc 15. What is a substance? Matter made up of a single kind 16. What is an element? Matter comprised of only one kind of atom 17. What is a compound? Matter comprised of 2+ atoms chemical combined 18. Explain the difference between a pure substance and a mixture. Specifically, address how they are bonded and how they can be separated. Pure substance has 1 kind of matter, mixture has 2+ that can be physically separated. 19. What is conductivity? The ability to transfer energy through a material 20. What is malleability? The ability to hammer into thin sheets (bend without breaking or tearing) 21. What is viscosity? A fluid’s resistance to flow 22. What is flammability? Ability to burn 23. What is reactivity? Ability to combine and create a new substance 24. What happens to the temperature of a substance during a phase change? It stays constant 25. Describe the difference between vaporization and evaporation. Vaporization is any change from liquid to gas. Evaporation is liquid to gas without the addition of heat 26. What are three things you can look for as evidence for a chemical change? a. Color change b. Gas production c. Heat production 27. What ONE THING must you look for to indicate that a chemical change has occurred? A new substance is formed