Chapter 1 - Chemical Foundations

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Chemistry

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20 Terms

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quantitative observation
A(n) ________ is also known as measurement involves a number and a unit.
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pure substance
When a mixture contains several volatile components, the one- step distillation does not give a(n) ________ in the receiving flasks, and more elaborate methods are required.
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possible explanation
A hypothesis is a(n) ________ for an observation.
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mixture
When a(n) ________ is separated, the absolute purity of the separated components is an ideal.
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electric current passes
When a(n) ________ through, water is decomposed to hydrogen and oxygen, which makes them be two- atom molecules.
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STM
The ________ uses an electron current from a tiny needle to probe the surface of a substance.
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Solid
________ is rigid and has a fixed volume.
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gasoline
Wood, ________, wine, soil, and air are the mixtures.
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hydrogen
Water is composed of two types of atoms: ________ and oxygen.
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qualitative
A(n) ________ does not involve a number.
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liquid
A(n) ________ has a definite volume but no specific shape.
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bridges
The atoms are connected to one another by ________.
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motives
Science is affected by profit ________, budgets, fads, wars, and religious belief.
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Celsius
Both the ________ and Kelvin scale are used in physical sciences.
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Density measurement
________ is also used to determine the amount of antifreeze and the level of protection against freezing.
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Distillation
________ is one of the most important methods for separating the components of a mixture.
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Theories
________ are human inventions that represent attempts to explain observed natural behavior.
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Physical change
________**: It is used to separate a used mixture into pure compounds and change in the form of a substance.
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pure substances
Mixtures can be separated into ________ by physical methods.
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