11) an atom that has lost an electron is A) a cation. B) unlikely to be found in homogeneous mixtures. C) electrically neutral. D) likely to behave exactly like the parent atom. E) an anion. 12) Molecules can be described as A)Â mixtures of two or more pure substances. B) mixtures of two or more elements that has a specific ratio between components. C) two or more atoms chemically joined together. D) heterogeneous mixtures. E) homogeneous mixtures. 13) Give the composition of water. A) two hydrogen atoms and two oxygen atoms B) one hydrogen atom and one oxygen atom C) two hydrogen atoms and one oxygen atom D) one hydrogen atom and two oxygen atoms 14) Give the composition of hydrogen peroxide. A) two hydrogen atoms and two oxygen atoms B) one hydrogen atom and one oxygen atom C) two hydrogen atoms and one oxygen atom D) one hydrogen atom and two oxygen atoms 15) Identify the characteristics of a liquid. A) definite volume and definite shape B) definite volume and no definite shape C) no definite shape and definite volume D) no definite shape and no definite volume 16) Identify the characteristics of a solid. A) definite volume and definite shape B) definite volume and no definite shape C) no definite shape and definite volume D) no definite shape and no definite volume 17) Identify the characteristics of a gas. A) definite volume and definite shape B) definite volume and no definite shape C) no definite shape and definite volume D) no definite shape and no definite volume 18) Which of the following statements about the phases of matter is true? A) In both solids and liquids, the atoms or molecules pack closely to one another. B) Solids are highly compressible. C) Gaseous substances have long-range repeating order. D) There is only one type of geometric arrangement that the atoms or molecules in any solid can adopt. E) Liquids have a large portion of empty volume between molecules. 19) A substance that can’t be chemically broken down into simpler substances is A) a homogeneous mixture. B) an element. C) a heterogeneous mixture. D) a compound. E) a gas. 20) A substance composed of two or more elements in a fixed, definite proportion is A) a homogeneous mixture. B) a heterogeneous mixture. C) a compound. D) a solution. E) an alloy.