Chem 125 Solve the problems Scientific Methods

Chem 125 Solve the problems Scientific Methods Question 1 Every sample of water has the same ratio of the mass of hydrogen to the mass of oxygen. Is this a hypothesis, law, or theory? Question 2 The universe was created in an initial explosion, the “big bang”. Is this a hypothesis, law, or theory? Question 3 New material can be created, which will shield radioactivity, but still be lightweight. Is this a hypothesis, law, or theory? Type of Matter Give an example of each of the following a. an element Na, H, etc. b. a compound H2O CH4 etc. c. a homogeneous mixture of filtered coffee etc. (one domain) d. a heterogeneous mixture of ice water, tea with bag, etc. (More than one domain). Conversions 1. How many milliliters are in 0.050 L? 2. 0.0035L to mL 3. 430.0mL to L 4. 0.0400 grams to mg Atomic Theory of Matter 1. What are the laws known before the atomic theory of matter was developed? 2. How does Dalton’s Theory differ from our current picture? The Structure of the atom 1. How many O atoms are present in Al(NO3)3 2. Which is larger A. Hydron atom B. Nucleus of Francium Atom The Periodic Table 1. What is the period for Cl a. 3 b. 6 c. 9 2. What is the group for Mg a. Rare gases b. Alkali earths c. Halogens d. Transition metals 3. What is the group for Cl a. Rare gases b. Alkali earths c. Halogens d. Transition metals 4. What is the group for Kr a. Rare gases b. Alkali metals c. Halogens d. Transitions metals 5. What is the group for K a. Rare gases b. Alkali metals c. Halogens d. Transitions metals 6. Which element is a nonmetal a. K b. Fe c. I d. Pb 7. Which is a metalloid a. Fe b. B c. C d. H 8. Which is a transition metal a. Cu b. AI c. Si 9. What is the chemical symbol for an element with 9 protons, 10 neutrons and 10 electrons? a. Ne b. F c. F- 10. How many protons are present in 32P? a. 32 b. 15 c. 16 d. 17 11. How many neutrons are present in 32P? a. 32 b. 15 c. 16 d. 17 12. What is the relationship between 12C and 13C a. They are isomers b. They are the same c. They are isotopes 13. What does the 12.01 correspond to on your periodic table on the square with C? a. It is the number of protons + the number of neutrons. b. It is the number of protons c. It is the average atomic mass 1. Give the correct chemical symbol for the following ionic compounds a. containing K and O b. containing Mg and HCO3 – 2. How many moles are present in 12.6 gram sample of iron? 3. What is the molar mass of C2H4? 4. How many moles are present in a 5.80 gram sample of KCl 2. Give the correct chemical symbol for the following ionic compounds a. containing K and O b. containing Mg and HCO3 3. How many moles are present in 12.6 gram sample of iron? 4. What is the molar mass of C2H4? 5. How many moles are present in a 5.80 gram sample of KCl? 6. How many atoms of Cl are present in a 3.65 mole sample of MgCl2? Electronic Structure 1. How are the electrons arranged in atoms? 2. Why is the periodic table, the way it is? 1. What type of bond is formed between Li and I? a. Ionic b. Covalent 2. What type of bond is formed between C and H? a. Ionic b. Covalent 3. What type of bond is formed between Cl and O? a. Ionic b. Covalent

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