Physical Science Chemical Reactions—Day 26 Materials Needed: Writing Utensil Folder Notebook *Pick up the handout on the front table!

Day 26 Bell Work: Look at your Exit Slips. Write a short summary of what we learned this unit. Agenda: Unit Review

Q: What results in increasing the rate of a chemical reaction? NeSA-S Review Q: What results in increasing the rate of a chemical reaction? Using larger pieces of reactant(s). Heating the container of reactant(s). Using a smaller amount of reactant(s). Limiting contact between the reactant(s). SC812.2.1.eDOK.1

Mathematics Booster Which years after 1980 had the highest percentage of savings? What was the savings rate in the year you were born?

Greek/Latin Greek/Latin Meaning Paragraph sci- know nota mark, note, sign centum one hundred milli a thousand thesis put, place; a proposition hetero different homo same genus kind non not peri around, about trans across, change

Objectives I will review for my chemistry unit test.

Bell Work Answers Look at your Exit Slips. Write a short summary of what we learned this unit.

A: What results in increasing the rate of a chemical reaction? Using larger pieces of reactant(s). – Incorrect. This would decrease the reaction rate because there would be fewer collisions. Heating the container of reactant(s). – Correct. This would increase the reaction rate because it increases the number of collisions. Using a smaller amount of reactant(s). – Incorrect. This would decrease the reaction rate because there is less to react. Limiting contact between the reactant(s). – Incorrect. This would decrease the reaction rate because this decreases the number of collisions. SC812.2.1.eDOK.1

Mathematics Booster Which years after 1980 had the highest percentage of savings? 1983 & 1998 What was the savings rate in the year you were born? Answers will vary

Physical Science Chemistry Review 1 Valence Electrons are found outside of the nucleus.   2. Compounds can be broken down into simpler substances only through chemical changes. 3. Substances in a mixture keep their identities because no chemical change takes place, they are only sharing space.   4. A (n) catalyst increases how fast a reaction occurs (reaction rate).

8. When a reaction gives off energy, it is a(n) exothermic reaction. 5. Atoms of the same element, but with different numbers of neutrons in the nucleus mean they are isotopes of the that element.   6. Nuclear radiation is charged particles and energy that are given emitted from the nuclei of radioisotopes. 7. An atom’s atomic mass is equal to the average of the masses of naturally occurring isotopes of the element.   8. When a reaction gives off energy, it is a(n) exothermic reaction.

9. The number of valence determine how a substance will react.   10. Solids, liquids and gases are all states of matter. 11. Fusion is a process in which the nuclei of two atoms combine to form a larger nucleus.   12. Elements and compounds are pure substances because they contain only 1 type of particle.

15. A substance that has a pH of 13.4 is a. indicator b. neutral 13. Elements in a compound a. cannot be separated by chemical changes. b. join in a specific ratio, for example H2O. c. do not combine with other elements. d. combine their properties.   14. In general, an increase in temperature a. does not affect reaction rate b. decreases reaction rate c. increases reaction rate d. acts as a catalyst 15. A substance that has a pH of 13.4 is a. indicator b. neutral c. acidic d. basic   16. Nuclear power plants generate electricity from a. nuclear fission b. nuclear fusion c. radioactivity d. combustion

17. Which of the following has no electric charge? a. proton b. neutron c. electron   18. Which of the following determines the identity of an element? a. atomic mass b. mass number c. atomic number d. valence electrons 19. The types of changes of state include? a. melting, freezing, and condensation b. solids, liquids, gases and plasma c. metal, metalloids, nonmetals d. burning, boiling and baking   20. One way to classify the periodic table? b. solids, noble gases and mixtures

21. Number of Protons = 53 22. Number of Neutrons = 74 23. Number of Electrons = 53 24. Number of Valence Electrons = 7 25. List 1 property of Iodine or Group 17. Answers will vary 26. What would be the result if one proton were to be added to Iodine? It would become Xenon.

Alike: Answers will vary 27. Compare and contrast ionic and covalent bonds. Give one way they are alike, and one way they are different. Alike: Answers will vary They hold atoms together Different: Answers will vary   Covalent shares electrons, ionic transfers electrons 28. Give one true characteristic of a base. Answers will vary. pH > 7, slippery, bitter taste   29. List at least 2 signs of a physical change. Answers will vary. melting, freezing, sublimation, boiling, evaporation, deposition, condensation

30. Give two sources of everyday radiation. Answers will vary A. sun, tv, power plant … 31. Why do chemists balance chemical equations? Answers will vary. But should include to make sure all atoms are accounted for, prove the law of Conservation of Mass. 32. List 1 similarity and 1 difference that the elements of a group share? Answers will vary. Similarities – valence electrons, chemical and physical properties Differences - # of particles   33. Explain the difference in exothermic reactions and endothermic reactions in regards to energy. Exothermic – releases energy into its environment endothermic – absorbs energy from its environment

34. Name 2 ways to determine the number of valence electrons for Barium (Ba) element # 56. a. Draw a Bohr diagram b. Look at the group the element is in   35. What is necessary to sustain a nuclear chain reaction? Answers will vary. But should include that there needs to be ample neutrons released and a large number of other atoms to bang into. 36. How is it that H2O is beneficial to humans, when the elements by themselves can be harmful? (H = highly flammable, O = needed for combustion) Answers will vary. But should include that the properties of a compound have NOTHING to do with the elements that make it up.

Homework Greek/Latin paragraph Study for Chemistry Unit Assessment Give students approximately 3 minutes to look at each poster, then have groups rotate around the room.

Exit Ticket Identify one thing you are going to study tonight for the unit assessment.