Chemistry ch. 1Matter and Change

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what doesn't change the amount of metter present

a chemical change

what is a change in which a substance is converted into a differnt substance

a chemical change

what is the same thing as a chemical reaction

a chemical change

what is a reaction that uses up energy

a endothermic reaction

what is a reaction that gives off energy

a exothermic reaction

what has a indefinite shape

a liquid and a gas

what is a blend of 2 or more types of matter

a mixture

what has a definite shape

a solid

what are chemicals

any substance with definite composition

matter

anything that has mass and volume

some nonmetals are solid, but the are usually what

brittle

how are elements organized

by properties on the periodic table

what is when a machine that spins quickly so that components with different densities will separate

centrifuge

chemist use______ to tell substances apart and to seperate them

characteristic properties

every sample of a pure substance has the same

characteristic properties and composition

groups have a similar what

chemical property

What do chemists work with

chemicals

what is the study of matter and the changes it undergoes

chemistry

what has parts that fall under both physical and biological science

chemisty

how doe periods' properties change

consistently across a period

what is when liquid is poered off after a solid has settled to the bottom

decanting

what are some examples of the intensive propertie

density, boiling point, ability to conduct

different grades of chemicals are used for what

different purposes

what does it meant if it can be made into wire

ductile

what is never destroyed or created

energy

when change occurs, what is involved

energy

what is another name for groups

families

what is when solid parts are trapped by fillter paper and the liquid part runs through the paper

filtration

what are some ways for physical separation

filtration, vaporization, decanting, centrifuge, and paper chromatography

what are some examples of physical changes

grinding, cutting, boiling

soil, concrete, blood, and choclolate chip cookies are all examples of what

heterogeneous mixtures

what mixture has visible parts and no uniform compositon

heterogeneous mixtures

a wgat has no visible parts and is unifrom in composition

homogeneous mixtures

vinegar, clear water and salt water are all examples of what

homogeneous mixtures

are periods horziontal or verticle columns or rows

horizontal rows

all chemicals have some level of what

impurity

when are atoms far apart

in a gas

when do atoms have a pretty weak attractive force

in a gas

when do atoms move very quickly

in a gas

when are atoms close

in a liquid

when can atoms overcome attractive forces to flow

in a liquid

when are atoms packed together in a fixed position

in a solid

when is their a strong attractive force between atoms

in a solid

what has a definite volume

in a solid, liquid, and gas

many sciences are very what

interrelated

what does it mean to have high tensile strength

it can resist breakage when pulled

what are the two rows below the periodic table called

lanthanide and actinide series

each square on the periodic table shows whe name and what

letter symbol for each element

what does it mean if it can be rolled or hammed into sheets

malleable

what is it called when a solid goes to a liquid and vice versa

melting and freezing

what element is a semiconductor

metalloids

what element is less malleable then metals, but less brittle than nonmetals

metalloids

what element is solid at room temperature

metalloids

what is an element that has some characteristics of both metal and nonmetals

metalloids

what element has a silvery or grayish white luster

metals

what is an element that at room temperature, most are solid

metals

what is an element that is a good conducter of electricity

metals

in mixtures, components are only physically what

mixed

what element is generally unreactive gases

noble gases

what element has poor conductory of heat and electricity

nonmetals

what element may be gases to room temperature

nonmetals

what are pure substances made of

one type of a element or compunds

what are the branches of chemistry

organic, inorganic, physical, analytical, biochemistry, and theoretical

what is used to separate mixtures becasue doffernt parts move quicker on paper than other

paper chromatography

science used to divided iinto strit categories. what were they

physical and biological

what are the types of properties

physical and chemical and extensive and intensive

what includes all chages of state

physical changes

what is a change in a substance that doesn't change the identity of the substance

physical changes

what is hign in temperature in which atoms lose their electrons

plasma

what is the substance that will form from a reaction

product

chemicals in the lab are treated as what

pure

elements are _____ substances

pure

element

pure substances made of only one type of atom

what is the substance that will react

reactants

what are some examples of the chemical property

rusting, combustion, tarnishing, and hardening

atom

smallest unit of an element that keeps the properties of the element

what is another name for homogeneuous mixtures

solution

what is it called when a solid goes to a gas and vice versa

sublimation

some certain properties define a group of what

substances

compound

substances made of 2 or more types of atoms that are chemicaly bonded

what are some examples of the physical property

temperature, color, melting point, amount, odor

what is physical chemistry

the study of changes of matter and their energy

what is analytical chemistry

the study of composition of materials

what is organic chemistry

the study of compounds contaninig carbon

what is inorganic chemistry

the study of compounds that aren't organic

what is biochemistry

the study of substances and the processes in living things

what is an example of a plasma

the sun

what is theoretical chemistry

the use of math and computers to inderstand chamical behaviors and design new compounds

how can a mixture be seperated

through physical means

why do chemists use instruments

to improve their ability to observe and make measurments

why are the lanthanide and actinide series at the bottom of the periodic table

to keep the width of the chart smaller

molecule

type of compound in which bonds are covalent bonds

technological development

type of research done to improve quality of life

basic research

type of research done to increase knowledge

applied research

type of research done to solve a problem

what do element symbls relate to

usually the english name, but some come form older names such as latin

what is where the liquid portion is evaportaed off to leave a solid

vaporization

what is it called whe a liquid goes to a gas and vice versa

vaporization and condensation

are groups horziontal or verticle columns or rows

verticle columns

what are some examples of the extensive propertie

volume, mass, amount of energy

physical property

what are characteristics that can be observed or measured without chaging the identity of a substance

extensive

what depends on the amount of matter

intensive

what does not depend on the amount of matter

technology

what is the application of knowledge for practical purposes

chemical property

what relates to a substances ability to undergi chages that transforms it into a different substance

during the reaction

when is chemical chages easiest to see

where do the lanthanide and actinide series fit

#57 and #89

what are groups numbered

1 -18

what are periods numbered

1-7

how many branches of chemisty are their

6


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