chapter 1

chem

37 cards·by authentic_yauni

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What is the study of matter and the changes it undergoes.

chemistry

things we can visualize with the human eye, touch, taste and feel

macroscopic

things we can't see touch, feel, taste, and need a microscope to see

microscopic

a systematic approach

scientific method

consisting of general observations about the system

qualitative

comprising numbers obtained by various measurements in the system

quantitative

a tentative explanation

hypothesis

is a concise verbal or mathematical relationship between phenomena that is always the same under the same conditions

law

observation deals with

events in macroscopic world

describes he experiments in symbols and chemical equation

representation

explains the observation and known sense rather than thought

interpretation

is a unifying principle that explains a body of facts and those laws that are based on them

theory

an increase in mass or in the acceleration of an object will always

increase the force proportionally, and a decrease in mass of acceleration will always decrease the force

anything that occupies space and has a mass

matter

substances, mixtures, elements, and compounds are all classifications of:

matter

is a form of matter that has a definite compostion and distinct properties

substance

water, ammonia, table sugar, gold, and oxygen

substances

is a combination of two or more substances in which the substances retain their distinct identies

mixture

______is either homogeneous or heterogeneous

mixture

any_____, whether homogeneous or heterogeneous can be created or seperated by its physical means into pure components

mixture

is a substance that can't be seperated into simpler substances by chemical means

element

Atoms of most elements form together to form

compounds

a_______is a substance composed of atoms of two or more elements chemically united in fixed proportions

compound

All substances exist in three states of matter:

solid, liquid, and gas

the color, melting point, and boiling point

physical properties

can be measured or observed without the changing in composition or identity of a substance

physical property

hydrogen gas burns in oxygen gas to form water

chemical property

boiling a hard boiled egg is a

chemical change

additive; mass, length,and volume

extensive property

not additive; density-- doesn't depend on how much mass is being considered and (temperature)

intensive property

mass/volume

density

force that gravity exerts on a object

weight

chemist are primarily interested in

mass

absolute temperature

kelvin

meaningful digits in a measured calculated quantity

significant digits

tells us how close the measurement is to the value of the quantity that was measured

accuracy

refers to how close a measurements of the same quantity agree with one another

precision