Chemistry Competency Exam PCC
# of electrons in ions - ANS-In ions, # Electrons = # Protons - (Charge)
Accuracy - ANS-closeness of a measured price to a fashionable or regarded cost
Anion - ANS-ion with a terrible price
Atomic Mass - ANS-common mass of atoms of an element
Atomic Number - ANS-Number of Protons (superb particles in an atom)
Atomic # = Number of Protons = fantastic debris in an atom
Atomic Number - ANS-general wide variety of protons and neutrons
Atoms - ANS-Atoms are composed of subatomic debris
Protons (+)
Neutrons
Electrons (-)
Structure
Nucleus --> protons and neutrons
Electrons fly around the nucleus in a small cloud
- Like costs repel each other; unlike expenses attract
- In a everyday (neutral) atom the wide variety of protons and the quantity of electrons are
equal
- Everything in the universe is made from be counted, and rely is fabricated from atoms
Cation - ANS-ion with a nice fee
Centi - ANS-10^-2
Charges on periodic table - ANS-On a periodic desk, the factors on the left usually have a
effective charge and factors on the right have a terrible rate
Chemical Change - ANS-A exchange that occurs while one or extra substances alternate
into totally new substances with different properties. (ex. Wooden burning)
Chemical Property - ANS-A function which can handiest be observed by changing the
identity of the substance (ex. Flammability, toxicity, pH)
Compound - ANS-consists of atoms of or more one of a kind factors certain collectively,
, Can be broken down right into a less complicated kind of be counted (factors) through
chemical approach (however not via bodily way),
Has houses which are one of a kind from its aspect factors, and
Always carries the same ratio of its aspect atoms.
Covalent Bond - ANS-Sharing of electron pairs among atoms
Density Formula - ANS-M/V
Element - ANS-Consists of best one type of atom,
Cannot be broken down right into a less difficult sort of depend with the aid of both physical
or chemical method, and
Can exist as either atoms (e.G. Argon) or molecules (e.G., nitrogen).
Cannot be broken down with the aid of chemical approach
Atoms of an element all have the equal range of protons, however they could have
extraordinary numbers of electrons and neutrons
Families - ANS-set of elements sharing not unusual houses
- Classified via 3 important categories of factors:
1. Metals
2. Nonmetals
3. Semimetals
Determined by way of # of electrons inside the outer power shell
Groups - ANS-vertical columns, each detail in a collection has the equal # of valence
electrons and generally behave in a comparable way while bonding with other factors
Bottom 2 rows --> lanthanides and actinides all belong to the 3B organization and are
indexed one at a time
Heterogenous - ANS-mixture in which the components of the aggregate are not uniform or
have localized regions with exceptional properties
Different samples from the mixture aren't equal to every different
Always or greater phases in a heterogeneous aggregate, in which you may pick out a
vicinity with residences which can be distinct from the ones of another area, even if they're
the same country of matter (e.G., liquid, stable)
Examples: cereal in milk, vegetable soup, pizza, gravel, soil
Homogenous - ANS-combination wherein the components that make up the combination are
uniformly disbursed at some stage in the combination
Examples: air, sugar water, rainwater, vodka, vinegar, metallic
Ion - ANS-charged particle formed with the aid of the elimination or addition of an electron
Metal atoms tend to lose electrons and nonmetal atoms tend to advantage electrons
# of electrons in ions - ANS-In ions, # Electrons = # Protons - (Charge)
Accuracy - ANS-closeness of a measured price to a fashionable or regarded cost
Anion - ANS-ion with a terrible price
Atomic Mass - ANS-common mass of atoms of an element
Atomic Number - ANS-Number of Protons (superb particles in an atom)
Atomic # = Number of Protons = fantastic debris in an atom
Atomic Number - ANS-general wide variety of protons and neutrons
Atoms - ANS-Atoms are composed of subatomic debris
Protons (+)
Neutrons
Electrons (-)
Structure
Nucleus --> protons and neutrons
Electrons fly around the nucleus in a small cloud
- Like costs repel each other; unlike expenses attract
- In a everyday (neutral) atom the wide variety of protons and the quantity of electrons are
equal
- Everything in the universe is made from be counted, and rely is fabricated from atoms
Cation - ANS-ion with a nice fee
Centi - ANS-10^-2
Charges on periodic table - ANS-On a periodic desk, the factors on the left usually have a
effective charge and factors on the right have a terrible rate
Chemical Change - ANS-A exchange that occurs while one or extra substances alternate
into totally new substances with different properties. (ex. Wooden burning)
Chemical Property - ANS-A function which can handiest be observed by changing the
identity of the substance (ex. Flammability, toxicity, pH)
Compound - ANS-consists of atoms of or more one of a kind factors certain collectively,
, Can be broken down right into a less complicated kind of be counted (factors) through
chemical approach (however not via bodily way),
Has houses which are one of a kind from its aspect factors, and
Always carries the same ratio of its aspect atoms.
Covalent Bond - ANS-Sharing of electron pairs among atoms
Density Formula - ANS-M/V
Element - ANS-Consists of best one type of atom,
Cannot be broken down right into a less difficult sort of depend with the aid of both physical
or chemical method, and
Can exist as either atoms (e.G. Argon) or molecules (e.G., nitrogen).
Cannot be broken down with the aid of chemical approach
Atoms of an element all have the equal range of protons, however they could have
extraordinary numbers of electrons and neutrons
Families - ANS-set of elements sharing not unusual houses
- Classified via 3 important categories of factors:
1. Metals
2. Nonmetals
3. Semimetals
Determined by way of # of electrons inside the outer power shell
Groups - ANS-vertical columns, each detail in a collection has the equal # of valence
electrons and generally behave in a comparable way while bonding with other factors
Bottom 2 rows --> lanthanides and actinides all belong to the 3B organization and are
indexed one at a time
Heterogenous - ANS-mixture in which the components of the aggregate are not uniform or
have localized regions with exceptional properties
Different samples from the mixture aren't equal to every different
Always or greater phases in a heterogeneous aggregate, in which you may pick out a
vicinity with residences which can be distinct from the ones of another area, even if they're
the same country of matter (e.G., liquid, stable)
Examples: cereal in milk, vegetable soup, pizza, gravel, soil
Homogenous - ANS-combination wherein the components that make up the combination are
uniformly disbursed at some stage in the combination
Examples: air, sugar water, rainwater, vodka, vinegar, metallic
Ion - ANS-charged particle formed with the aid of the elimination or addition of an electron
Metal atoms tend to lose electrons and nonmetal atoms tend to advantage electrons
