1. In the modern Periodic Table, the elements are arranged in order of increasing
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1 1. In the modern Periodic Table, the elements are arranged in order of increasing A atomic number B mass number C oxidation number D valence number 2. Berylium is classified as A an alkaline earth metal C a transition metal B an alkali metal D a noble gas
2 3. More than two-thirds of the elements of the Periodic Table are A metalloids B metals C nonmetals D noble gases 4. Which atom has a nucleus that contains 13 protons and 14 neutrons? A Mg B Be C Al D N
3 5. Which type of matter is composed of two or more different elements that are chemically combined in a definite ratio? A a solution C a homogeneous mixture B a compound D a heterogeneous mixture 6. Which process is a chemical change? A melting of ice C subliming of ice B boiling of water D decomposing of water
4 7. An atom of any element must contain A an equal number of protons and neutrons C more electrons than neutrons B an equal number of protons and electrons D more electrons than protons 8. In the box provided below, draw the electron-dot (Lewis) structure of an atom of calcium.
5 9. What is the atomic number of an element that has six protons and eight neutrons? A 6 B 2 C 8 D An example of a heterogeneous mixture is A soil B sugar C carbon monoxide D carbon dioxide
6 11. What is the total number of valence electrons in an atom of phosphorus in the ground state? A 5 B 2 C 3 D Which statement is an identifying characteristic of a mixture? A A mixture can consist of a single element. B A mixture can be separated by physical means. C A mixture must have a definite composition by weight. D A mixture must be homogeneous.
7 13. Which is an example of a chemical reaction? A nails rusting B glass melting C sugar dissolving D alcohol vaporizing 14. According to the periodic table, the neutral atom of what element has 4 protons, 5 neutrons, and 4 electrons? A beryllium B boron C fluorine D aluminum
8 15. Use the Periodic Table of Elements to answer the following question(s). Which sentence about the periodic table of elements is true? A All elements in period 2 are metals. B All elements in group 18 are metals. C Metals are found on the left side of the periodic table. D Metals are found on the right side of the periodic table. 16. Which of the following is best classified as a compound? A Helium (He), because it contains only one type of atom B Oxygen (O2), because it contains two of the same type of atoms C Carbon dioxide (CO2), because it contains two different types of atoms D Manganese (Mn), because it contains a metal and a nonmetal
9 17. Use this element from the periodic table to answer the question. What is the atomic mass for silicon? A 14.0 B 14.1 C 28.1 D The atomic number of an element indicates which of the following? A the number of neutrons in the atom B the number of protons in the atom C the sum of the neutrons and protons in the atom D the sum of the protons and electrons in the atom
10 19. Which of the following explains why saltwater is considered a mixture? A It is composed of one element. B It is composed of one compound. C It is composed of two or more substances and has new chemical properties. D It is composed of two or more substances that retain their own chemical properties. 20. When electricity passes through water, hydrogen and oxygen are produced. Which table correctly labels the compounds and elements involved in the process? A Water Compound Hydrogen Compound Oxygen Element B Water-Compound Hydrogen-Element Oxygen-Compound C Water-Compound Hydrogen-Element Oxygen-Element D Water-Element Hydrogen-Element Oxygen-Compound
11 21. Which of the following will form a compound when combined? A Atoms B Elements C Neutrons D Electrons 22. Anita has a small sample of an unknown element that she is trying to identify. Anita divides the mass of the sample by its volume. Which property of matter is Anita using to identify the element? A Weight B Density C Texture D Freezing point
12 23. Which pure substance is composed of more than one element? A carbon B gold C water D sodium 24. The smallest particle of any element that still has the properties of that element is called A an atom. B a compound. C a solution. D a mixture.
13 25. Use the partial periodic table to answer the following question. The noble gas neon is used for filling neon signs. Like other noble elements, it has a full octet (complete outer energy level) of electrons, which makes the gas A freeze at room temperature. C unlikely to combine with other elements. B react with other gases in the air. D solidify at standard pressure and temperature. 26. Which action will result in a product with new chemical properties? A shredding a newspaper C cutting wood B breaking a mirror D popping popcorn
14 27. C 3 H 8 + O 2 CO 2 + H 2 O This chemical equation represents the combustion of propane. coefficient for water is When correctly balanced, the A 2. B 4. C 8. D A balanced chemical equation reflects the idea that the mass of the products A is greater than the mass of the reactants. C equals the mass of the reactants. B is less than the mass of the reactants. D is not related to the mass of the reactants.
15 29. The law of conservation of mass can be demonstrated by a chemical reaction. Which of the following models of a chemical reaction best represents the law of conservation of mass? A B C D
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