1. Review For Midterm Exam Physical Science

2. Set up the a graph for the following experiment. For this, the time (sec) is the independent variable, and the distance (mi) is the dependant variable. Time (seconds) Distance (mi)

3. What part of the experiment is described in each sentence 1.One day you don’t wear any perfume at all. 2.While testing the different types, you spray the same amount on you each day. You take a shower and wash with the same soap and the same shampoo. You test the perfume by asking the same people how they like the perfume. 3.Each day you spray a different kind of perfume on yourself. 4.Each day a different number of people like the perfume best. 5.At the end of the experiment, you decide based on your data, people prefer the first perfume the best.

4. answer 1.One day you don’t wear any perfume at all. control 2. While testing the different types, you spray the same amount on you each day. You take a shower and wash with the same soap and the same shampoo. You test the perfume by asking the same people how they like the perfume. Constant 3. Each day you spray a different kind of perfume on yourself. Independent variable 4. Each day a different number of people like the perfume best. Dependent variable 5. At the end of the experiment, you decide based on your data, people prefer the first perfume the best. conclusion

5. converting 1. 80kg = _______ g 2. 565 cm = ________m 3. 68 mg = _______hg 4. 300 dg = _______mg 80000 g 5.65m.00068hg 30000mg

6. How many millimeters in one hectometer? How many meters in one decameter? 100000 10

7. What is the volume of this liquid 52.8 ml

8. Identify each material listed below as a pure substance or a mixture. 1.Nickel, Ni 2.Coca-Cola 3.Snickers bar 4.Sugar, C 121 H 22 O 11 Pure sub Mixture Pure sub.

9. Identify each mixture listed below as heterogeneous or homogeneous. – Kool-Aid – Sand and water – Italian salad dressing Homogenous Heterogenous heterogenous

10. The density of a sample of wood is.85 g/mL. The mass of the wood is 24.5 grams. What is the volume of the sample? 28.8 mL

11. 1.Between what letters is the substance a solid? 2.Between what letters is the substance melting? 3.Is it possible to change the temperature of a substance while you are changing its phase? A B-C No,

12. Which substance is more dense…why?

13. which block has greater mass? which block has greater volume? which block has greater density? B They are equal in density

14. Number of neutrons in 34 S Mass number of a phosphorus atom with 17 neutrons Mass number of a boron atom with 7 neutrons 18 32 12

15. Calculate the average atomic mass for the following isotopes: (2 pts) 53 Mn – 12% 54 Mn – 74% 57 Mn – 14% 54.3 amu

16. How many electrons are in each energy level of a Scandium atom? What charge ion will it probably form? 2 in the 1 st 8 in the 2 nd 9 in the 3 rd 2 in the 4 th It will probably lose 2 electrons and have a charge of +2

17. What is the charge and location of a – Proton – Neutron – electron Proton: positive in the nucleus Neutron: neutral in the nucleus Electron: negative in energy levels in the electron cloud

18. Believed that the atom was made of a nucleus and electrons that moved around the nucleus in set paths called orbits. Discovered the nucleus by conducting a gold foil experiment Thought that atoms where solid spheres Thought that atoms were solid positive spheres with bits of negative material. Bohr Rutherford Dalton Thompson

19. Symbol Atomic # Mass Charge Protons Neutrons electrons Li 3 6 0 3

20. Forces that hold different atoms or ions together bonds

21. How many valence electrons do most atoms need to be stable? How many do H and He need? What type of bond occurs between 2 non metals What is the overall charge of any molecule? 8 2 Covalent 0

22. Write the chemical formula for Sodium + Sulfur Write the chemical formula for Manganese (III) Sulfide Na 2 S Mn 2 S 3

23. Write the name for N 2 O 2 Write the name for SrCl 2 Write the name for CrO 3 Dinitrogen dioxide Strontium chloride Chromium (VI) oxide

24. A solid melts- is this a chemical reaction? Bubbles are produced when a solid is added to a liquid- is this a chemical reaction? A firecracker explodes- is this chemical reaction? How do you know? For the reaction A + B + energy --> AB, is energy absorbed or released? No, physical- no new material is formed Yes Yes – energy is released absorbed

25. Balance the reaction: K 3 PO 4 + HCl --> KCl + H 3 PO 4 K 3 PO 4 + 3HCl --> 3KCl + H 3 PO 4

26. For the reaction AX + BY -->AY + BX, what type of reaction is this? what are the products? what are the reactants? Double displacement Products AY + BX Reactants AX + BY