Quiz Standard 1 Answer Key Teacher Name: Quiz Generated On: 04-28-2016 1) Identify the number of neutrons in one atom of sulfur with an isotopic mass number of 34 amu. A) 16 B) 18 C) 32 D) 34 E) None of the above Explanation: One atom of sulfur with an isotopic mass number of 34 has 18 neutrons. 34 (total) - 16 (protons) = 18 (neutrons). 2) Which is true of ionic compounds? A) They are good conductors as solids. B) They are made by sharing electrons. C) They are made of metals and nonmetals. D) They are electrically neutral when dissolved in a solution. E) None of the above Explanation: They are made of metals and nonmetals is true of compounds. They usually form between elements on opposite sides of the periodic table. Ionic compounds are only good conductors when molten or dissolved. When dissolved, they form ions, charged particles. Ionic compounds transfer electrons. 3) Which is true of all covalent compounds?
A) Anything that has mass and occupies space. B) The smallest particle that has the properties of an element. C) A substance that cannot be broken down chemically into simpler substances. D) The smallest unit of a substance that exhibits all of the properties characteristic of that substance. E) None of the above Explanation: The smallest particle that has the properties of an element, is the correct definition of an atom. A is the definition of matter; C is the definition of an element; and D is the definition of a molecule. 14) This image is an example of a(n) A) atom. B) compound. C) mixture. D) molecule. E) None of the above Explanation: The correct answer is atom. It is the smallest unit of an element, all of the others require more than one element. 15)
C) 30 kg D) 70 kg E) None of the Explanation: 10 kg of 4FE + 3O2 would be required to produce 10 kg of rust. This is the Law of Conservation of Matter. 19) K2O Use IUPAC nomenclature rules to properly identify this compound. A) potassium oxide B) dipotassium C) potassium (I) oxide D) dipotassium monoxide E) None of the Explanation: The correct name is potassium oxide. It is a binary ionic compound, so no prefixes are used. Since potassium is a representative metal with only one possible charge, no roman numerals are used. 20) Hydrogen peroxide is a chemical used to clean bacteria out of cuts. It does this through creating germ-eating oxygen in this decomposition reaction. What set of coefficients, respectively, balance this equation? H2O2 → H2O + O2 A) 1 → 1,2 B) 2 → 2,1
C) 2 → 2,2 D) 4 → 4,1 E) None of the above Explanation: 2 → 2,1 Start by balancing the O, by putting a 2 in front of H2O (this gives an even number of O). This creates a total of 4 O on the product side and 4 H. To balance the H, put a coefficient of 2 on the reactant side. 21) The correct chemical formula for magnesium sulfide is A) Mg2S B) Mg3S4 C) MgS D) MgS2 E) None of the Explanation: The correct chemical formula for magnesium sulfide is MgS. This is an ionic compound. The Mg ion has a charge of 2+, the sulfide a charge of 2-, so they bond in a 1:1 ratio. 22) Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s) This chemical equation represents a ______________ reaction. A) synthesis B) decomposition C) neutralization D) single replacement
B) NH3 C) N3H D) N3H3 E) None of the above Explanation: The elements involved at 2 nonmetals that will form covalent bonds. NH3 33) Ca3(PO4)2 + H2SO4 → CaSO4 + H3PO4 Balance this reaction if necessary. A) balanced B) 1, 3, 3, 2 C) 1, 2, 3, 3 D) 3, 2, 1, 3 E) None of the above Explanation: 1, 3, 3, 2 Ca3(PO4)2 + 3H2SO4 → 3CaSO4 + 2H3PO4 34) H2SO4 + NaOH → Na2SO4 + H2O Balance this reaction if necessary. A) balanced B) 1, 2, 1, 2 C) 1, 2, 1, 4 D) 1, 2, 2, 2
C) 25 D) 50 grams E) None of the above Explanation: 25 grams would remain after one half-life (4.5 billion years). Find the point where percent remaining is 50% and that will tell you it is one half-life. 16) What is one reason nuclear fuel is a positive alternative to fossil fuels for the creation of electrical energy? A) Nuclear power is much less hazardous than coal or oil power production. B) Nuclear power is much more widely available than coal or oil power production. C) Nuclear power produces no carbon dioxide emissions unlike coal or oil power production. D) Nuclear does not require the use of natural resources like coal or oil power production. E) None of the above