問題一覧
1
can be observed without changing tha composition of a substance
physical property
2
composed of 2 or more elements combined chemically in definite proportions
compounds
3
are caused by non ideal chemical or physical behavior of the reaction system
method error
4
4th state of matter.formed by ionizing a gas
plasma
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Empedocles
earth, water, air, and fire
6
composed of a uniform composition of particles
homogeneous
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occurs between metal and a non metal
ionic bond
8
he discovered the x-ray
wilhelm conrad roentgen
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he discovered the elctron while studying the nature of cathode rays
joseph john thompson
10
can combine chemically to form compounds
elements
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thales of miletus
water
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occurs when a group of metal atoms shares a cloud of valence electrons
mattalic bonding
13
space it occupies
volume
14
it refers to the closeness of measurement within a set of data
precision
15
are expressed as exact whole number
counted items
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used in mixtures of liquids and heavy insoluble solids
decantation
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simplest type of matter that is composed of only one kind of atom
elements
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he is known as the father of modern chemistry
antoine lavoisier
19
accurate to 1 decimal place in grams
triple beam balance
20
are inherent to the measuring apparatus
random error
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method used to seperate components of different degrees of solubility using a moving stationary fluid
chromatography
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liquid into ice
freezing
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the number of electrons lost or gained
charged number
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are exact numbers but are not always whole number
defined relations
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former student of Rutherford
james chadwick
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is the curvature, either convex or curvature
meniscus
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the quantity of matter packed into a unit volume of material
density
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can be observed with an accompanying change in the chemical composition of a substance
chemical property
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states that all things from the same type have the same proportions of the elements that compose them
law of constant proportions
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cellular respiration
oxygen
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accurate to 3 decimal places
analytical balance
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are caused by incompetence of the experimentor
operative/personal error
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solid to gas
sublimation
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substances that are chemically unreactive with other substances
inert
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turns the water vapor into liquid water
condensation
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radioactivity of uranium
henri becquerel
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multi-phase substances in a non-uniform composition
heterogeneous
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the one that does the dissolving
solvent
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Anaximenes
air
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can he separated by chemical means into elements
compounds
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nonmetals on the other hand, gain electrons and become negatively charged
anions
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are those that can be attributed to definite causes
systematic error
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substituted with a sulfur atom
polyatomic ions
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different properties
particulate nature, physical and chemical properties, and extensive and intensive properties
45
Leucippus and Democritus 5 principles
1. all matter is made up of atoms that are too tiny. 2. atoms are in constant motion around an empty space called void. 3. atoms are completely solid. 4. atoms are uniform with no internal structure. 5. atoms come in different sizes and shapes.
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energy required to remove an electron from the atom
ionization energy
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basic building blocks of most cells
carbon
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also known as "factor units method"
dimensional analysis
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ability of atoms to hold electrons tightly
electronegativity
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are rhose that are severe enough or the measurements or the entire analysis altogether has to be separated
gross error
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accurate to 2 decimal places
top loading balances
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are caused by failures or imperfections of the measuring device
instrumental errors
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can be separated by physical means into pure substances
mixtures
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as water, which comprises in the body fluids
hydrogen
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homogeneous mixture of substances and can be physically combined in varying proportions
solution
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it indicates how close a measurements is to the true or accepted value
accuracy
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the substances that gets dissolved
solute
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tha amount of matter
mass
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the force exerted on a mass by gravity
weight
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produced when clouds of bosons is cooled to temperature ver close to absolute zero
Bose Einstein condensate
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brought about by absorbing or releasing an amount of energy into or out of matter
phase changes
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reverse process of sublimation
deposition
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ice turns to liquid water
melting
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particles in an compound are held together by faces of attraction
chemical bond
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Heraclitus
fire
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seperates miscible liquids of different boiling points such as ethyl alcohol and water
distillation
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opposite of ionization energy
electron affinity
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discovered and describe alpha and beta ray as positively and negatively charged radiations
Ernest Rutherford
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addition of heat changes liquid water into vapor
vaporization
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British chemist and physicist who discovered the element thallium in 1861
sir william crookes
71
popularized atomism, the philosophy that matter is amde up of atoms
epirucus
72
those that are obtained from reading measuring devices
measured numbers
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metal tends to lose electrons and become positively charged
cations
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more commonly used in science than the english system
metric system