Chm 104 practice set
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47 Terms
Ductility
Ability to be drawn into thin wires.
Metalloids/Semimetals
Elements with properties of both metals and nonmetals.
Element
Cannot be broken down by ordinary chemical means.
Theory
General statement explaining many observations.
Significant Figures
Digits in a number that contribute to its precision.
Chemical Property
A characteristic that describes how a substance interacts with other substances.
Physical Change
A change that affects one or more physical properties of a substance without altering its chemical composition.
Element
A pure substance made of only one kind of atom.
Compound
A substance formed when two or more elements are chemically bonded together.
Mixture
A physical combination of two or more substances.
Density
Mass per unit volume of a substance.
Proton
A subatomic particle with a positive charge, located in the nucleus.
Neutron
A subatomic particle with no charge (neutral), also located in the nucleus.
Electron
A subatomic particle with a negative charge, found in orbitals around the nucleus.
Atomic Number
The number of protons in the nucleus of an atom, which determines the element.
Atomic Mass
The weighted average mass of an element's isotopes.
Significant Figures Rules
Guidelines to determine which digits are significant in a number.
Volume of a Cube
Calculated by raising the length of an edge to the third power.
Conversion Factor
A ratio used to convert from one unit to another.
Mass
A measure of the amount of matter in an object.
Chemical Reactivity
The tendency of a substance to undergo chemical reactions.
Combustibility
The ability of a substance to ignite and burn.
Ductility
Ability to be drawn into thin wires.
Metalloids/Semimetals
Elements with properties of both metals and nonmetals.
Element
Cannot be broken down by ordinary chemical means.
Theory
General statement explaining many observations.
Significant Figures
Digits in a number that contribute to its precision.
Chemical Property
A characteristic that describes how a substance interacts with other substances.
Physical Change
A change that affects one or more physical properties of a substance without altering its chemical composition.
Element
A pure substance made of only one kind of atom.
Compound
A substance formed when two or more elements are chemically bonded together.
Mixture
A physical combination of two or more substances.
Density
Mass per unit volume of a substance.
Proton
A subatomic particle with a positive charge, located in the nucleus.
Neutron
A subatomic particle with no charge (neutral), also located in the nucleus.
Electron
A subatomic particle with a negative charge, found in orbitals around the nucleus.
Atomic Number
The number of protons in the nucleus of an atom, which determines the element.
Atomic Mass
The weighted average mass of an element's isotopes.
Significant Figures Rules
Guidelines to determine which digits are significant in a number.
Volume of a Cube
Calculated by raising the length of an edge to the third power.
Conversion Factor
A ratio used to convert from one unit to another.
Mass
A measure of the amount of matter in an object.
Chemical Reactivity
The tendency of a substance to undergo chemical reactions.
Combustibility
The ability of a substance to ignite and burn.
Isobars
Atoms of different elements that have the same mass number but different atomic numbers.
Isotopes
Atoms of the same element that have the same atomic number but different mass numbers (due to different numbers of neutrons).
Isotones
Nuclides of different elements that have the same number of neutrons but different numbers of protons and mass numbers.
Flashcards (35)