2AgNO 3 How many atoms are contained in the following chemical formula?

1. 2AgNO3 • How many atoms are contained in the following chemical • formula? a. 3. c. 10 b. 5 d. 2

2. H2SO4 + 2KOH----->K2SO4 + 2H2O • 2. How many elements are found on each side of the following chemical • equation? a. 13. c. 10 b. 14. d. 4

3. 3. Which of the following elements has 6 protons, 6 electrons and 6 neutrons? a. Carbon c. Oxygen b. Magnesium d. Argon

4. 4. How many elements are in the formula for TNT? a. 3 c. 4 b. 21 d. 19

5. 5. How many total atoms are in the formula for TNT? a. 3 c. 4 b. 21 d. 19

6. 6. Which nonmetal has 8 valence electrons? a. carbon c. oxygen b. sulfur d. neon

7. 7. Bromine (Br) is in the same family of which of the following elements? • a. Chlorine (Cl) c. Boron (B) b. Selenium (Se) d. Argon (Ar)

8. 8. The picture shows a model of the element — Atomic # of 4 a. fluorine b. helium c. beryllium d. oxygen

9. 9. Students made observations of several different substances and classified them into groups shown in chart. Which of the following should be classified into Group 3 of the chart? a. glass- solid c. granite- solid b. helium- gas d. soil- solid

10. 10. The elements in Group 18 of the periodic table which usually do not react with others are called: • a. Metalloids c. alkali earth metals • b. noble gases d. metals

11. 11. Fill in the blank with the best answer. When an egg rots, milk sours or an apple slice turns brown,a(n) change occurs. • a. physical c. chemical • b. phase d. appearance 12. Which is an example of a chemical change? a. melting ice c. burning wood b. mixing salt and water d. using steam to create electricity

12. 13. The nucleus of an atom contains: ( remember Pee iN the middle) a. positive protons and negative neutrons c. positive protons and neutralneutrons b. negative electrons and neutral neutronsd. positive protons and negative electrons 14. Which elements make up the compound CO2? a. Cobalt and Oxygen c. Carbon and Oxygen b. Calcium and Ozone d. Carbon and Ozone 15. Which part of an atom orbits around the nucleus? a. electrons c. protons b. neutrons d. photons

13. 16. A student wants to measure the amount of liquid left after a chemical reaction. Which tool should be used? • a. triple-beam balance- g c. ruler- cm • b. graduated cylinder- ml d. spring scale- N 17. Which elements are in the compound C6H12O6? a. Carbon, Helium and Oxygen c. Calcium, Helium and Oxygen b. Carbon, Hydrogen and Oxygen d. Cobalt, Hydrogen and Oxygen 18. Which part of the atom has a negative charge? a. proton c. nucleus b. neutron d. electrons

14. 19. What part of the atom is represented by the grapes in the picture to the right? a. nucleus c. electrons b. protons d. orbital 20. How many molecules of baking soda acid are shown? 5 NaHCO3 a. 11 c. 30 b. 5 d. 4 21. What is the approximate mass of an atom with 31 protons and 38 neutrons? (Atomic number + neutrons = Atomic mass) a. 31 c. 69 b. 38 d. it is not possible to find out without knowing protons

15. 22. Which of the following is an example of a chemical reaction? a. Ice melting when it is removed from the freezer b. Trimming a bush with clippers c. A marshmallow cooked over a campfire d. water boiling on the stove 23. This picture shows one part of the periodic table. According to this information, how many protons does an iron atom contain? a. 55.847 c. 13 • b. .847 d. 26

16. 24. Which letter in this model of a boron atom represents a neutron? a. W c. Y b. X d. Z

17. 25. According to the periodic table, which of the following best represents a carbon atom? A B C D

18. 26. The table below shows the number of protons in an atom of four different elements. According to the periodic table, which of these elements is a metal? a. T b. Q c. X d. Z

19. 27. The shaded outer area in this model of an atom represents a: • A. cloud of negatively charged electrons • B. cloud of positively charged electrons • C. cloud of negatively charge protons • D. cloud of positively charge protons

20. 28. Which two elements are most similar? a. Fe and Co c. Cu and Ag b. Li and F d. H and O • 29. What does the arrow ( ) sign mean in a chemical equation? a. add c. subtract b. Produces/yields d. nothing 30. Which of the following contains elements that have similar physical or chemical properties? a. group or family c. row b. period d. luster

21. 31. The two parts to a chemical equation are: a. radioactive and poisons c. solution and product b. reactant and product d. reaction and production 32. The Law of Conservation of Mass best explains why: a. equations must be balanced on both sides b. there are more atoms of an element in the reactants than the products c. there are more atoms of and element in the product than the reactants d. coefficients tell the number of molecules present in an equation

22. 33. Which of the following are good conductors of heat and electricity? a. nonmetals c. metals b. noble gas d. metalloids

23. 34. Which atom has the most electrons on its shells? a. b. c. d.

24. 35. The chemical formula for water is H2O. How many protons are in a molecule of • water? (remember A.P.E.) a. 3 c. 2 b. 10 d. 18 36. What should students do after using dry chemicals in a laboratory experiment? a. place them in a sealed container before throwing them away b. ask a teacher about the safest way to dispose of them c. mark them with labels that indicate that they are poisonous d. pour them into a sink and carefully wash them down the drain

25. 37. What phrase can be used to remember how to find the number of protons in anatom? a. APE MAN c. TAIL b. Pee iN the middle d. GEORGE