CHM 090 EXAM 2 QUESTIONS WITH ACCURATE ANSWERS

SI system of measurement - correct answers the International System of Units developed by scientists as a worldwide standard of measurement Si units for mass - correct answers kilograms(kg) Si units for time - correct answers seconds (s) Si units for temperature - correct answers Kelvin (K) SI units for length - correct answers meter (m) Mass - correct answers the amount of matter in an object Weight - correct answers A measure of the force of gravity on an object boiling point of water in Celsius - correct answers 100 Boiling point of water in kelvin - correct answers 373.15 Boiling point of water in Fahrenheit - correct answers 212 Freezing point of water in Celsius - correct answers 0 Freezing point of water in kelvin - correct answers 273.15 Freezing point of water in Fahrenheit - correct answers 32 absolute zero - correct answers The coldest temperature, 0 Kelvin, that can be reached. It is the hypothetical temperature at which all molecular motion stops. Density - correct answers mass divided by volume Metals - correct answers Metals have a shiny metallic luster. Metals conduct heat and electric currents well Metals are malleable - this means they are can be extended or shaped, without breaking, by the blows of a hammer. Nonmetals - correct answers brittle, not malleable, poor conductors of heat and electricity. Nonmetal elements also tend to gain electrons in chemical reactions. Metalloids - correct answers Metalloids tend to be economically important because of their unique conductive properties - they only partially conduct electricity. Isotopes - correct answers atoms of the same element that have different numbers of neutrons Isotopes examples - correct answers Carbon atoms Solid - correct answers Constant shape and volume Liquid - correct answers Different shape same volume Gas - correct answers Different shape and volume Energy - correct answers energy is the capacity to do work. Heat - correct answers energy that is transferred from a region of higher temperature to a region of lower temperature. Temperature - correct answers measure of the average motion of particles in a system. kinetic energy - correct answers energy due to motion potential energy - correct answers stored energy Insulator - correct answers A material that does not conduct heat well Conductor - correct answers A material that conducts heat well Specific heat - correct answers The amount of energy required to raise the temperature of 1 gram of a substance by 1 degree celcius chemical change - correct answers A change in matter that produces one or more new substances Chemical change examples - correct answers rusting, burning something, spoiled food or baking/cooking physical change - correct answers A change in a substance that does not involve a change in the identity of the substance physical change example - correct answers cutting paper Melting - correct answers solid to liquid Freezing - correct answers liquid to solid Evaporation - correct answers Liquid to gas Condensation - correct answers Gas to liquid Sublimation - correct answers solid to gas Deposition - correct answers gas to soli