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CHEM 1301 exam 1 review questions with accurate
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detailed solutions ||
3 classifications of matter - ✔✔elements
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compounds
mixtures
compounds - ✔✔pure substances with a fixed composition
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combination of elements || ||
mixtures - ✔✔not substances, composition varies
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2 classes of mixtures - ✔✔heterogeneous - 1 or more visible boundary betweeen components
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homogeneous- has no visible boundaries || || || || ||
also called a solution bc components are mixed
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qualitative observation - ✔✔does not involve a number
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quantitative observation - ✔✔is called a measurement and does involve a number and unit
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rules for sig figs - ✔✔1. non zero numbers always count ex. 12455
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2. leading zeros are not sig. ex. 00.0023
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3. captive zeros count ex. 2003
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4. trailing zeros count if there is a decimal ex. 1000.
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5. exact numbers have unlimited amount of sig figs
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, 2
addition and subtraction in calculations - ✔✔want the least number of decimal places
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multiplying and dividing in calculations - ✔✔want the least number of sig figs
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element - ✔✔pure substance with unique physical and chemical properties that cannot be broken
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down
dalton's atomic theory - ✔✔1. elements are made of tiny particles called atoms
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2. all atoms are identical
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3. the atoms of that given element are different from any other element
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4. atoms can combine with other atoms to form compounds
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5. atoms are indivisible in chemical processes. they are not created or destroyed in chemical
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reactions
elements are made of tiny particles called atoms - ✔✔true
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all atoms of a given element are identical - ✔✔false. because the element can differ by mass
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the atoms of a given element are different from those of any other element - ✔✔true
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a given compound always has the same relative numbers and types of atoms - ✔✔true
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Joseph J. Thompson - ✔✔showed that cathode rays consist of tiny negatively charged particles
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Robert A. Millikan & Harvey Fletcher - ✔✔discovered the charge and mass of the electron
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CHEM 1301 exam 1 review questions with accurate
|| || || || || || || ||
detailed solutions ||
3 classifications of matter - ✔✔elements
|| || || || ||
compounds
mixtures
compounds - ✔✔pure substances with a fixed composition
|| || || || || || ||
combination of elements || ||
mixtures - ✔✔not substances, composition varies
|| || || || ||
2 classes of mixtures - ✔✔heterogeneous - 1 or more visible boundary betweeen components
|| || || || || || || || || || || || || ||
homogeneous- has no visible boundaries || || || || ||
also called a solution bc components are mixed
|| || || || || || ||
qualitative observation - ✔✔does not involve a number
|| || || || || || ||
quantitative observation - ✔✔is called a measurement and does involve a number and unit
|| || || || || || || || || || || || ||
rules for sig figs - ✔✔1. non zero numbers always count ex. 12455
|| || || || || || || || || || || ||
2. leading zeros are not sig. ex. 00.0023
|| || || || || || ||
3. captive zeros count ex. 2003
|| || || || ||
4. trailing zeros count if there is a decimal ex. 1000.
|| || || || || || || || || ||
5. exact numbers have unlimited amount of sig figs
|| || || || || || || ||
, 2
addition and subtraction in calculations - ✔✔want the least number of decimal places
|| || || || || || || || || || || ||
multiplying and dividing in calculations - ✔✔want the least number of sig figs
|| || || || || || || || || || || ||
element - ✔✔pure substance with unique physical and chemical properties that cannot be broken
|| || || || || || || || || || || || || ||
down
dalton's atomic theory - ✔✔1. elements are made of tiny particles called atoms
|| || || || || || || || || || || ||
2. all atoms are identical
|| || || ||
3. the atoms of that given element are different from any other element
|| || || || || || || || || || || || ||
4. atoms can combine with other atoms to form compounds
|| || || || || || || || || ||
5. atoms are indivisible in chemical processes. they are not created or destroyed in chemical
|| || || || || || || || || || || || || || ||
reactions
elements are made of tiny particles called atoms - ✔✔true
|| || || || || || || || ||
all atoms of a given element are identical - ✔✔false. because the element can differ by mass
|| || || || || || || || || || || || || || || ||
the atoms of a given element are different from those of any other element - ✔✔true
|| || || || || || || || || || || || || || ||
a given compound always has the same relative numbers and types of atoms - ✔✔true
|| || || || || || || || || || || || || ||
Joseph J. Thompson - ✔✔showed that cathode rays consist of tiny negatively charged particles
|| || || || || || || || || || || || ||
Robert A. Millikan & Harvey Fletcher - ✔✔discovered the charge and mass of the electron
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