Chemistry 121 Exam 1 Questions With Correct Answers!!

What are the three states of matter? - Answer-solid, liquid and gas ___ is the study of properties and behavior of matter. - Answer-chemistry ___ is the physical material of the universe. It is also anything the has mass and occupies space. - Answer-matter __ is matter that is made up of one "thing" - Answer-pure substance __ is a mixture that doesn't have the same composition, properties, and appearance throughout. - Answer-heterogeneous __ is a mixture that is uniform throughout. - Answer-homogeneous Solid to a gas is - Answer-sublimation Gas to a solid is - Answer-deposition Liquid to a solid is - Answer-freezing Liquid to a gas is - Answer-vaporization Gas to a liquid is - Answer-condensation Solid to a liquid is - Answer-melting What two things make up pure substances? - Answer-elements and compounds (molecules) How many known elements are there? - Answer-118What are most elements? - Answer-monatomic What seven elements are diatomic? - Answer-H2, F2, Cl2, I2, O2, N2, BI2, Which of the following are heterogeneous? Magnesium, concrete, seawater, milkshake. - Answerconcrete & milkshake __ precipitate less soluble component and separate solid from liquid - Answer-filtration ___ separate by boiling point - Answer-distillation __ separate by solubility or attraction (chemical property) - Answer-chromatography __ depends upon amount of sample: (mass, volume, length) - Answer-extensive __ does not depend on amount of sample: (color, temperature, melting point, density) - Answerintensive __ __ __ __ are determined by studying how substances change or react to make new substances and to give off or absorb energy. - Answer-chemical properties of matter __ changes in physical appearance of a substance but not its chemical composition. - Answer-physical changes transformations of substances into chemically different substances - Answer-chemical changes which of the following is a physical process? rusting of iron, boiling canned soup, dissolving of sugar in water, or burning of wood - Answer-boiling canned soup and dissolving of sugar in water __ is a measure of how tightly packed the particles in a substance are. - Answer-densityWho worked with cathode ray tubes in the late 1800's that lead to the discovery of the electron? - Answer-J.J. Thomson In 1919 who lead the oil drop experiment that discovered both the charge and the mass of an electron? - Answer-Robert Millikan Who proposed the plum pudding model of an atom? - Answer-J.J. Thomson Who preformed the gold foil experiment? - Answer-Ernest Rutherford The atom has a dense center of _ charge (the nucleus) with _ moving around it at a distance that is large relative to the nuclear radius. - Answer-positive & electrons Who discovered the proton? - Answer-Rutherford Who discovered the neutron? - Answer-James Chadwick _ is an atom that has gained or lost electrons - Answer-ion Atoms of an element may differ in the number of neutrons is an _. - Answer-isotope H - 1p + 0n = __ - Answer-hydrogen H - 1p + 1n = __ - Answer-deuterium H - 1p + 2n = __ - Answer-tritium What is the atomic number in Sb? - Answer-51 What is the mass number in Sb? - Answer-121What are some words to describe a metal? - Answer-malleable, ductile, lustrous, great thermal and electrical conductors What are some words to describe nonmetals? - Answer-brittle, dull, poor thermal and electrical conductors Rows in a periodic table are called? - Answer-periods