뒤로Anatomy & Physiology: Basic Chemistry and Matter Concepts
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Chemistry is the study of matter and the changes it undergoes.
Matter is anything that occupies space and has mass.
Pure substances, mixtures, elements, compounds, molecules, and atoms.
Homogeneous and heterogeneous mixtures.
98 elements occur naturally on Earth.
20 elements have been created by scientists.
A compound is a pure substance composed of atoms of two or more different elements chemically united in fixed proportions.
A molecule is a substance composed of two or more atoms chemically united in fixed proportions.
A compound contains atoms of different elements; a molecule can be atoms of the same or different elements.
Physical changes do not change composition; chemical changes alter the composition of matter.
Solids, liquids, and gases.
Solids have a fixed shape and are not easy to compress.
Liquids have no defined shape and are not easy to compress.
Gases have no fixed shape and are invisible and intangible.
Change of state from solid to liquid.
Change of state from liquid to solid.
Change of state from solid directly to gas.
Change of state from gas directly to solid.
Change of state from liquid to gas.
Change of state from gas to liquid.
A plateau indicates a change of state where temperature remains constant.
Solid state.
Gas state.
Liquid state.
Density is mass per unit volume, calculated as \(D=\frac{M}{V}\).
Method to find volume of irregular objects by subtracting initial water volume from final volume.
Volume of object = Final volume - Initial volume (Vobj = Vf - Vi).
The object will float.
The object will sink.
Ratio of the density of a substance to the density of pure water.
Kelvin, Celsius, and Fahrenheit.