Chapter One: Chemistry And Measurements
Chapter One: Chemistry and Measurements
Describe the “scientific method” in terms of hypothesis, experiment, theory, and law. • The scientific method begins with observation (a woodpecker is make a hole in a tree). • Followed by hypothesis (because the tree has termites) • Followed by experiment (a collection of woodpeckers is observed in a setting in which trees have no termites). • Leading to a refined hypothesis and further experiment to a possible theory (woodpeckers only make holes when making a nest) • Leading to a “law” (if many additional observations cannot refute the theory).
State the Law of Conservation of Mass and use it to determine unknown masses of reactant or product in a chemical reaction. • In chemical reactions, atoms are …show more content…
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Is there a temperature at which F and C are identical?
[pic]
Define density and solve numeric problems using this definition and appropriate values of density, mass, length, and volume. • Density is a physical property, which is [pic]. • For solids and liquids the units are [pic] or [pic] [pic]. • For gases the units are [pic]. Note that density of a gas varies significantly with temperature. How many grams would gold occupy in a 2.00L block of gold? The density of gold is 19.7g/cm3. [pic]
Solve conversion problems such as “convert 2.0 lbs/ft3 to grams/cm3” using the method of dimensional analyses. • In dimensional analysis, units must cancel, excepts for units of the answer and the conversion factors must be correct. [pic] *squaring/cubing identities is sometimes necessary*
Determine the number of significant figures in measured values and in any numeric calculation based on these
Describe the “scientific method” in terms of hypothesis, experiment, theory, and law. • The scientific method begins with observation (a woodpecker is make a hole in a tree). • Followed by hypothesis (because the tree has termites) • Followed by experiment (a collection of woodpeckers is observed in a setting in which trees have no termites). • Leading to a refined hypothesis and further experiment to a possible theory (woodpeckers only make holes when making a nest) • Leading to a “law” (if many additional observations cannot refute the theory).
State the Law of Conservation of Mass and use it to determine unknown masses of reactant or product in a chemical reaction. • In chemical reactions, atoms are …show more content…
[pic] [pic] [pic]
Is there a temperature at which F and C are identical?
[pic]
Define density and solve numeric problems using this definition and appropriate values of density, mass, length, and volume. • Density is a physical property, which is [pic]. • For solids and liquids the units are [pic] or [pic] [pic]. • For gases the units are [pic]. Note that density of a gas varies significantly with temperature. How many grams would gold occupy in a 2.00L block of gold? The density of gold is 19.7g/cm3. [pic]
Solve conversion problems such as “convert 2.0 lbs/ft3 to grams/cm3” using the method of dimensional analyses. • In dimensional analysis, units must cancel, excepts for units of the answer and the conversion factors must be correct. [pic] *squaring/cubing identities is sometimes necessary*
Determine the number of significant figures in measured values and in any numeric calculation based on these