問題一覧
1
formed when a pair of electrons is shared between two atoms
covalent bond
2
classification of matter:
pure substance , mixture
3
branches of chemistry:
organic , inorganic , physical , analytical , biochemistry
4
a mole consists of _____ particles such as atoms, molecular or ions
6.02 x10^23
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properties of the substance that are related to its size and shape examples: volume, mass, and weight
extrinsic property
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properties which matter can show without being destroyed
physical property
7
a matter that has definite composition and a definite boiling point
pure substance
8
mixtures whose parts or composition are not distinguishable even to some extent through a microscope
homogenous mixture
9
it this bond, the electron cloud is equally distributed to the atoms
non-polar covalent bond
10
properties which matter can show by losing its identity
chemical property
11
it is the sum of the protons and neutrons in the atom
atomic weight
12
formed by the overlap of atomic orbitals in the original atoms
molecular orbital
13
in this bond, the electron cloud is shifted more toward one of the atom
polar covalent bond
14
it represents the mass of a chemical compound
molecular weight
15
it is a negatively charged electrode
cathode
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physical or chemical changes which causes energy release from the substance to the surroundings
exothermic changes
17
the smallest particles of elements
atom
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charge of proton:
1.60 217 663 x10^-19 c
19
a homogenous mixture made up of a solute dissolved in solvent, the composition of which is variable
solution
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a substance that is composed of only one kind of atom
element
21
refers to the amount of solute in a given amount of solvent or solution
concentration of a solution
22
charge of electron:
-1.60 217 663 x10^-19 c
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formed when electrons are transferred from one atom to another
ionic bond
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a matter that has neither definite boiling point nor definite composition
mixture
25
types of pure substance:
element , compound
26
4 major categories of elements:
metals , non-metals , metalloids , noble gases
27
"when two elements react to form more than one compound, the different weights of one that combine with a fixed weight of the other are in the ratio of small whole numbers"
law of multiple proportion
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properties of matter:
intrinsic , extrinsic , physical , chemical , endothermic changes , exothermic changes
29
it is the central part of an atom which protons and neutrons are located
nucleus
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way of representing a chemical reaction using chemical formulas to indicate the reactants and products
chemical equation
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a substance that is composed of two or more elements chemically combined in definite and constant proportion
compound
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it is number of protons in the nucleus
atomic number
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this bond have two pairs of electrons between two atoms
double bond
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types of mixture:
homogenous , heterogenous
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3 subatomic particles:
proton , neutron , electron
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the smallest particles of compounds
molecule
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"a pure compound is always made up of same constituent elements combined in a definite proportion by weight"
law of definite proportion
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properties of the substance that are independent of the shape and size of the substance examples: temperature and pressure
intrinsic property
39
"energy can not be created nor destroyed. It can only be transformed from one form to another"
conservation of energy
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it is a positively charged electrode
anode
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“mass can neither be created nor be destroyed”
conservation of mass
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this bond have three pairs of electrons between two atoms
triple bond
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mass of neutron:
1.0087 amu
44
mixtures whose parts or composition are readily visible or easily identifiable
heterogenous mixture
45
bonding which always gain or loss enough electrons to attain a noble gas electron configuration
monatomic bond
46
physical or chemical changes in which energy is absorbed by the substance
endothermic changes
47
a branch of science which deals with the study of matter and the changes it undergoes
chemistry
48
mass of electron:
0.00055 amu
49
mass of proton:
1.0073 amu
50
it is anything anything that occupies space and has mass
matter