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Chemistry Exam midte

Chemistry Mid-Term Exam Review

QuestionAnswer
He believed that atoms were indivisible and indestructible? Democritus
He used experimental methods to transform Democritus's ideas on atomic theory? John Dalton
He arranged the elements in his periodic table in order of increasing atomic mass? Dmitri Mendeleev
He determined an atomic number for each known element? Henry Moseley
He discovered the electrons? J.J Thompson
He made a model known as the nuclear atom? Ernest Rutherford
He proposed that an electron is found only in specific circular paths, or orbits, around the nucleus? Neils Bohr
He confirmed the existence of yet another subatomic particle James Chadwick
He carried out experiments to find the quantity of charge by an electron? R.A Millikan
What are the basic steps of the the scientific method? Making observations,testing hypotheses, and developing theories
What is a measure of the space occupied by the object? Volume
What is a force that measures the pull on a given mass by gravity? Weight
What is a measure of the amount of matter an object contains? Mass
What is an intensive property that depends only on the composition of a substance , no the size? Density
What are the three (primary) states of matter? Briefly describe each. Solid: has a definite shape and volume, Liquid: indefinite shape, yet fixed volume, Gas,takes both the shape and size of its container.
A copper penny has a mass of 3.1 g and a volume of 0.35 cm3. What is the density of the copper?
What is the law of conservation of mass? Mass that cannot be created nor destroyed in a chemical reaction.
What does luster mean? How shiny something is
List four properties of metals? High luster , malleable, ductile good conductors of heat and electricity, hard shiny.
List at least four properties of nonmetals? They rarely have metallic luster, usually gas a room temperature, neither malleable nor ductile, and poor conductors of heat and electricity.
List the Metalliods? Boron, silicon, Germanium, arsenic, antimony, tellurium, and astatine.
describe the location of protons, neutrons, and electrons in the atom. Describe their charge and relative mass when compared to one another? Proton located in the nucleus, charge +1; Neutron located in the nucleus, charge 0; Electron located outside the nucleus, charge -1.
What does the atomic number and mass number tell us about the atom? What is the nuclear symbol for aluminum? Atomic number = number of protons; Mass number = the number of protons and neutrons added together; nuclear symbol for aluminum = 27 Al 13
Smallest particle of an element that retains its identity in a chemical reaction? Atom
Neutral group of atoms joined together by covalent bonds? Molecule
Simplest form of matter that has a unique set of properties; can't be broken down into simpler substance by chemical means? Element
Substance that contains two or more elements chemically combined in a fixed proportion? Compound
Physical blend of two or more substances that are not chemically combined? Mixture
Mixture that is in composition ; components are evenly distributed? Homogeneous mixture
Mixture that is not uniform? Heterogeneous mixture
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