Welcome back!! Take out your Homework packet (HW# 11and 12) Content Quiz on Thursday (4/11/13)

1. L.T: I can review my homework packet about physical and chemical changes. Welcome back!! Take out your Homework packet (HW# 11and 12) Content Quiz on Thursday (4/11/13)

2. L.T: I can review my homework packet about physical and chemical changes. Electon Proton Label the part an the atom below (next to the arrows): Neutron

3. L.T: I can review my homework packet about physical and chemical changes. Very, very tiny. a) The size of electrons (e-) in comparison to the nucleus. Response: __________________________________ b) The size of the nucleus in comparison to the rest of the atom. Response: ___________________________________ c) How the nucleus and electron move. Response: ____________________________________ *d) Atoms consist mostly of: _____________________ Very large. Electrons fly around nucleus. Nucleus vibrates Empty Space

4. L.T: I can review my homework packet about physical and chemical changes. atoms All matter (anything that takes up space) is made up of extremely tiny “lego blocks” called__________.  Examples of things that are made up of atoms are _______, _________, and _________________. Atoms are made up of 3 main parts called ____________, _________, and _____________. Electronshave a ___________ charge, while protons have a_______________charge. Neutronshave _________________ charge. air food people protons neutrons electrons negative (-) positive (+) no charge (0)

5. L.T: I can review my homework packet about physical and chemical changes. atomic number The number of protons also called the____________ tells you the identity of the atom. For example, ONLY atoms of the element named ______________ have 6 protons, while ONLY atoms of the element named _________________ have 8 protons. The electrons allow atoms to_______________ to form molecules and ________________molecules. At the center of atoms is the _____________ which is made up of _____________ and ______________. The role of the __________________ is to act like glue to hold the nucleus together. Carbon Oxygen connect/bond compound nucleus protons neutrons neutrons

6. L.T: I can review my homework packet about physical and chemical changes. J Match the following words with the definitions 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) I E D G H F B K A C

7. L.T: I can review my homework packet about physical and chemical changes. W X N 12) 13) 14) 15) 16) 17) 18) 19) 20) 21) 22) 23) 24) O M T R V Q L S U P

8. L.T: I can review my homework packet about physical and chemical changes. 1) Which of the following represents a physical change? a) Milk souring b) H2O (s) H2O (l) c) 2 H2 (g) + O2(g) 2 H2O (l)d) 2 Na (s) + Cl2 (g)  2 NaCl(s)

9. 2) Identify the reactants, products, and the total # of atoms in the products for the following chemical equation: 2 NaCl(s) 2 Na (s) + Cl2 (g) a) Reactants : _____________ (b) Products: _____________ c) Total number of atoms in the products: ___________ 2 NaCl(s) 2 Na (s) + Cl2 (g) 4

10. L.T: I can review my homework packet about physical and chemical changes. 7) The independent variable is ___________________________  8) The dependent variable is ______________________________ 9) As the water temperature is increased from 30oC to 90oC, how much more grams of potassium bromide will dissolve in 100 grams of water? Response: ________________g temperature solubility 100g - 70g = 30

11. L.T: I can review my homework packet about physical and chemical changes.  10) NaOH a) 39.997 amub) 59.028 amuc) 85.977 amud) 119.991 amu 11) 6 CaBr2 a) 199.886 amub) 231.874 amuc) 400.276 amud) 1199.316 amu

12. L.T: I can review my homework packet about physical and chemical changes. 12) Sodium(Na) is a metal that reacts with H2O very quickly. Which of following elements most likely reacts very quickly with water? a) Magnesium (Mg) b) Calcium (Ca) c) Flourine(F) d) Potassium (K) e) Sulfur (S) 13) All of the elements that are heavier than Hydrogen came from ________________________, which are super-heated gas balls of hydrogen , through a process called ________________________. a) Planets, Fission b) Stars, Fusion c) Compounds, Fusiond) Planets, Fusion stars Fusion

13. L.T: I can review my homework packet about physical and chemical changes. H2 He • A chemical reaction between two H atoms that bond at their electrons produces ________________, however a nuclear reaction between two H atoms where their nucleus fuses produces ________________. a) 2 H, H2b) He, 2H c) He, H2d) H2, He 15) The elements fluorine (F), chlorine(Cl), bromine (B), and iodine (I) are all found in group (17) on the Periodic Table of Elements. These elements are grouped together because they a) are all metals b) are all gases c) have the same atomic mass d) react in similar ways 16) Water (H2O) is not found on the Periodic Table of Elements because water is a) an atom b) a liquid c) a mixture d) a compound