Unit 1 Section 1 Assessment

Part 1: Matching (1-6 2 points each) Anything that takes up space and has mass. Shows movement over time. The microscopic building blocks that have chemical properties of all living and nonliving things. Protons, neutrons, and electrons. Any pure substance that cannot be broken down. There are 100 of these known to man. Newton’s law of motion stating that any object that is moving will stay moving or any object that is at rest will stay at rest, unless an outside force acts on it. ____ Atoms ____ Sub-Atomic Particles ____ Elements ____ Matter ____ Inertia ____ Motion

Part 2 (7-13 3 points each) 7. Atoms are the building blocks for ____________________________. (In other words, what can you build with atoms?)

8. What are 3 examples of things that atoms can make? a. b. c.

9. Explain why you could or could not see an atom with your naked eye

10. What are the smallest parts of an atom? a. b. c.

11. The number of _________________ an atom has decides the atomic number or chemical identity.

12. What is the difference between a Helium atom and a Hydrogen atom?

13. What makes up the mass of an atom? The protons and neutrons in the electron cloud. The protons and electrons in the nucleus. The electrons and neutrons in the nucleus. The protons and neutrons in the nucleus.

14. Structure of an atom: (8 points) Label the parts of an atom in the diagram given to the right

15. (3 points) If the symbol for gold is Au, Au has an atomic number of 79 and atomic mass of 197 then… How many protons are in Au? _______ How many electrons are in Au? ______ How many neutrons are in Au? _______

16. (3 points) If the symbol for Bromine is Br, Br has an atomic number of 35 and atomic mass of 80 then … How many protons are in Br? _______ How many electrons are in Br? ______ How many neutrons are in Br? ______

17. (5 points) Explain how you know if atoms occupy space 17. (5 points) Explain how you know if atoms occupy space. (Justify your answer using 3 details from your lab experiments.)

18. (5 points) Explain how you know if atoms have mass 18. (5 points) Explain how you know if atoms have mass. (Justify your answer using 3 details from your lab experiments.)