General Chemistry ACS Exam 40 Questions with Verified Answers,100% CORRECT, Exams of Chemistry

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General Chemistry ACS Exam 40 Questions with Verified

Answers

Chemistry - CORRECT ANSWER the study of matter, its properties, and the changes that matter undergoes matter - CORRECT ANSWER physical material of the universe

• anything that has mass and occupies space property - CORRECT ANSWER any characteristic that allows us to recognize a particular type of matter and to distinguish it from other types element - CORRECT ANSWER combinations of substances in matter atom - CORRECT ANSWER small building block of matter
• composition: kinds of atoms the matter contains
• structure: arrangement of atoms molecule - CORRECT ANSWER 2+ atoms joined in specific shape matter is characterized by... - CORRECT ANSWER 1. physical state

2. composition gas - CORRECT ANSWER - no fixed volume/shape

• uniformly fills container
• can be compressed or expanded liquid - CORRECT ANSWER - volume independent of container
• assumes shape of container
• not compressible solid - CORRECT ANSWER - definite shape and volume
• not compressible

pure substance - CORRECT ANSWER matter that has distinct properties and a composition that doesn't vary from sample to sample

• element: cannot be decomposed into simpler substances
• compound: composed of 2+ elements
• mixture: combinations of 2+ substances; retains chemical identity electrolysis - CORRECT ANSWER an electrical current passes through a substance and decomposes it into its component elements mixture - CORRECT ANSWER composition can vary (components)
• heterogeneous mixture: vary in texture/appearance
• homogeneous mixture: uniform throughout (aka solution) physical properties - CORRECT ANSWER observed without changing a substance's identity and composition
• color, odor, density, melting point, boiling point, hardness chemical properties - CORRECT ANSWER the way a substance may react to form other substances
• flammability intensive property - CORRECT ANSWER don't depend on amount of sample being examined
• temperature, melting point extensive property - CORRECT ANSWER depend on amount of sample
• mass, volume physical change - CORRECT ANSWER substance changes appearance but not composition
• ex: water evaporation chemical change/reaction - CORRECT ANSWER substance is transformed into a chemically different substance
• ex: hydrogen burning in air

filtration - CORRECT ANSWER mixture of solid and liquid is poured through filter paper; liquid passes through, solid stays distillation - CORRECT ANSWER depends on different abilities of substances to form gases chromatography - CORRECT ANSWER depends on substance's ability to adhere to surfaces of solids energy - CORRECT ANSWER the capacity to do work/transfer heat work - CORRECT ANSWER the energy transferred when a force exerted on an object causes displacement heat - CORRECT ANSWER the energy used to cause the temperature of an object to increase force - CORRECT ANSWER any push/pull exerted on an object work equation - CORRECT ANSWER w = Fd

• w: work
• F: force
• d: distance kinetic energy - CORRECT ANSWER energy of motion kinetic energy equation - CORRECT ANSWER Ek = 1/2 mv^
• Ek: kinetic energy
• m: mass
• v: volume potential energy - CORRECT ANSWER stored energy metric system - CORRECT ANSWER units of scientific measurement SI units - CORRECT ANSWER choice of standard metric units

mass - CORRECT ANSWER amount of material in an object weight - CORRECT ANSWER force exerted on mass by gravity temperature - CORRECT ANSWER hotness/coldness of an object Kelvin equation - CORRECT ANSWER K = C + 273.

• K: Kelvin
• C: Celsius derived unit - CORRECT ANSWER multiplied/divided of base units density - CORRECT ANSWER amount of mass in a unit volume of a substance density equation - CORRECT ANSWER d = m/v
• d: density
• m: mass
• v: volume joule - CORRECT ANSWER SI unit for energy
• 1cal = 4.184J