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21) Two or more substances in variable proportions, where the composition is constant throughout are A) a compound. B) an element. C) a heterogeneous mixture. D) a homogeneous mixture. E) a crystalline solid. 22) Two or more substances in variable proportions, where the composition is variable throughout are A) a solution. B) a homogeneous mixture. C) a compound. D) an amorphous solid. E) a heterogeneous mixture. 23) All of the following are SI base units of measurement, except A) meter. B) gram. C) second. D) kelvin. E) mole. 24) Which of the following represents a hypothesis? A) Sodium reacts with water to form sodium hydroxide and hydrogen gas. B) Nitrogen gas is a fairly inert substance. C) Nickel has a silvery sheen. D) When a substance combusts, it combines with air. E) When wood burns, heat is given off. 25) Which of the following represents a valid hypothesis? A) Neon does not react with oxygen. B) Sodium metal reacts violently with water. C) Lead is soft and malleable. D) Oxygen is a gas at room temperature. E) Metals tend to lose electrons. 26) The statement, “In a chemical reaction, matter is neither created nor destroyed” is called A) the Law of Conservation of Mass. B) Dalton’s Atomic Theory. C) the Scientific Method. D) the Law of Multiple Proportions. E) the Law of Definite Proportions. 27) Dalton’s Atomic Theory states A) that all elements have several isotopes. B) that matter is composed of small indestructible particles. C) that the properties of matter are determined by the properties of atoms. D) that energy is neither created nor destroyed during a chemical reaction. E) that an atom is predominantly empty space. 28) The Scientific Method A) is just a theory. B) is a strict set of rules and procedures that lead to inarguable fact. C) isn’t used much in modern chemistry. D) is based on continued observation and experiment. E) is a framework for proving an argument you know to be true. 29) Which of the following statements is true? A) A scientific law is fact. B) Once a theory is constructed, it is considered fact. C) A hypothesis is speculation that is difficult to test. D) An observation explains why nature does something. E) A scientific law summarizes a series of related observations. 30) All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements. Which law does this refer to? A) Law of Definite Proportions B) Law of the Conservation of Mass C) Law of Modern Atomic Theory D) Law of Multiple Proportions E) First Law of Thermodynamics

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