CHEM 101-Straighterline Exam 1 Questions with Complete Solutions 2023/2024 A substance in which the atoms or molecules are free to move relative to one another. It always assumes the shape and volume of its container. - Correct Answer gas A substance in which the atoms or molecules pack closer than a gas, but are still able to freely move relative to one another. It exhibits a fixed volume, but not a fixed shape. - Correct Answer liquid A substance in which the atoms or molecules are fixed at a specific position. It exhibits a fixed volume and rigid shape. - Correct Answer solid A solid that has atoms and molecules in a repeatable pattern. - Correct Answer crystalline solid A solid whose atoms or molecules are not arranged in a specific pattern. - Correct Answer amorphous solid A substance does not vary its composition within the substance nor between samples of the same substance. - Correct Answer pure substance A physical combination of substances in which each substance keeps its own physical and chemical properties. - Correct Answer mixture A physical combination of substances of non-uniform composition. - Correct Answer heterogeneous mixture A physical combination of substances of uniform composition. - Correct Answer homogeneous mixture A pure substance that cannot be broken into component parts. Examples include helium, nitrogen, and oxygen. - Correct Answer element A pure substance made up of two or more elements. - Correct Answer compound A quantitative observation. - Correct Answer measurement Any division of a quantity that may be used in a measurement. - Correct Answer unit The SI unit for length. - Correct Answer meter The SI unit for time. - Correct Answer second The SI unit for mass. - Correct Answer kilogram 1 / 2
The standard unit of measurement used to count atoms. - Correct Answer mole A unit system abbreviated as SI that is used by scientists. - Correct Answer International System of Units A unit system of measurement used throughout the world. - Correct Answer metric system A unit system of measurement mainly used in the United States. - Correct Answer english system Changes the SI unit by a power of 10. - Correct Answer prefix multiplier An English temperature unit system used mainly in the United States. - Correct Answer fahrenheit A combination of SI units. - Correct Answer derived units A metric temperature unit system used throughout the world. - Correct Answer celsius A derived unit defined as mass/volume. - Correct Answer density A property that does not depend on the amount of a substance. - Correct Answer intensive property A property that depends on the amount of a substance. - Correct Answer extensive property A measurement that is repeatable in an experimental setup, within an acceptable range of error. - Correct Answer reliable measurements How close a series of measurements are to each other. - Correct Answer precision How close a series of measurements are to the actual value. - Correct Answer accuracy A non-place-holding digit in any numerical measurement. - Correct Answer significant digit Rounding numerical data to the nearest power of 10 for rapid estimated calculations. - Correct Answer order-of-magnitude estimation The force that holds atoms together in molecules and materials. - Correct Answer chemical bond A bond between two or more atoms in which the electrons are shared. - Correct Answer covalent bond
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