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問題一覧
1
You can filter sea water to remove any debris and slowly evaporate the water by heating the filtrate in an evaporating dish until salt crystals start forming
evaporation
2
is a subatomic particle, symbol p or p⁺ , with a positive electric charge of +1e elementary charge and a mass slightly less than that of a neutron
proton
3
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals.
atomic structure
4
_____is the fourth state of matter
plasma
5
It involves assigning numbers to characteristics of objects or events in such a way that the numbers reflect reality.
measurement
6
Is how close measure values are to each other, basically how many decimal places are at the end of a given measurement.
precision
7
___________is composed of particles packed so loosely that it has neither a defined shape nor a defined volume.
gaseous matter
8
_________is made of more loosely packed particles
liquid matter
9
________is composed of tightly packed particles
solid matter
10
what are the different types of measurement scales
nominal, ordinal, interval, ratio
11
___________can be measured without changing a substance's chemical identity
physical properties
12
Uses gravity and centrifugal force to separate particles heavier than the liquid medium
centrifugation
13
_______ are the elements that have the same atomic no. but different in atomic mass.
isotopes
14
___________is the mass of an object divided by its volume.
density
15
the ion that losses e
cation
16
_____ spin the material at high rotation speeds and separate the particulate from the liquid.
centrifuges
17
__________ can be measured only by changing a substance's chemical identity
chemical properties
18
is an ionized gas, a gas into which sufficient energy is provided to free electrons from atoms or molecules and to allow both species, ions and electrons, to coexist.
plasma
19
Is how close a measure value is to the true value.
accuracy
20
The most basic form of filtration is using gravity to filter a mixture
general filtration
21
All ________ is particulate in nature.
matter
22
two or more elements can combine to form different compounds in whole-number ratios
law of multiple proportions
23
Are neutral particles made of two or more atoms bonded together.
molecules
24
A set of chemical symbols showing the elements present in a compound and their relative proportions and in some cases the structure of the compound.
chemical formulas
25
__________is the process of separating suspended solid matter from a liquid, by causing the latter to pass through the pores of some substance, called a filter.
filtration
26
________Is the calculation of reactants and products in chemical reactions
stoichiometry
27
the ion that gains e
anion
28
______are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value.
significant figures
29
The concept of the mole can be used to convert between mass and number of particles.
avogadros no
30
It is used as the bridge between chemistry on the atomic and macroscopic scale
atomic mass
31
States that matter can neither be created nor destroyed. This law was put forth by Antoine Lavoisier 1789
law of conservation of mass
32
can exist in one of three main states: solid, liquid, or gas.
matter
33
is a subatomic particle, symbol e⁻ or β⁻ , whose electric charge is negative one elementary charge
electron
34
The number 6.022 × 10²³ is known as________
avogadros number
35
Accuracy matters too, but it's best when measurements are both precise and accurate
true
36
Each atom is made up of smaller particles______,______,______
electron, proton, neutron
37
Is a method used by scientists for separating organic and inorganic compounds so that they can be analyzed and studied.
chromatography
38
__________is calculated from a molecular formula by dividing the mass of a single element in one mole of a compound by the mass of one mole of the entire compound.
percent composition
39
_________such as density and colour, do not depend on the amount of the substance present.
intensive properties
40
Chemical laboratory process used to separate mixtures.
decanting
41
______is defined as the difference between the true or actual value and the measured value.
measurement error
42
is a subatomic particle, symbol n or n⁰ , with no electric charge and a mass slightly greater than that of a proton
neutron
43
Is a positively or negatively charged particle.
ion
44
This law was given by a French chemist joseph proust. He stated that a given compound always contains exactly the same proportion of element by weight.
law of definite proportions
45
All matter is made up of tiny particles called______
atom