CHEM 134 LECTURE EXAM 1 QUESTIONS WITH ANSWERS

CHEM 134 LECTURE EXAM 1 |\ |\ |\ |\ |\




QUESTIONS WITH ANSWERS |\ |\




What is matter? give examples of matter. - CORRECT ANSWERS
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✔✔anything that takes up space and has mass. ex: you, trees, water,
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a house, air
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What is a substance? ex - CORRECT ANSWERS ✔✔A form of
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matter that has a definite (constant) composition and distinct
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properties (water, ammonia, sugar, table salt)
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What is a mixture? ex - CORRECT ANSWERS ✔✔is a combination
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of two or more substances in which the substances retain their
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distinct identities (constant composition throughout) ex: sweat
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what are the two types of mixtures? - CORRECT ANSWERS
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✔✔homogeneous and heterogeneous mixtures |\ |\ |\




What is a homogeneous mixture? ex - CORRECT ANSWERS ✔✔a
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mixture that is the same throughout (coffee)
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,What is a heterogeneous mixture? ex - CORRECT ANSWERS ✔✔a
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mixture in which the composition is not uniform throughout
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(pieces of seaweed in water) |\ |\ |\ |\




what are the three states of matter? - CORRECT ANSWERS
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✔✔solid, liquid, gas |\ |\




how do you identify a substance? - CORRECT ANSWERS ✔✔based
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on their properties and their composition
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what are the four types of properties? - CORRECT ANSWERS
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✔✔physical, chemical, intensive, extensive |\ |\ |\




What is a physical property/how is it measured? ex of physical
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changes - CORRECT ANSWERS ✔✔Measured without changing
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the composition of the substance (color, melting pt, boiling pt.
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--------- SUBSTANCE IS THE SAME BUT IT PHYSICALLY
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CHANGES)


what is a chemical property/how is it measured? ex of chemical
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changes - CORRECT ANSWERS ✔✔a chemical property is
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measures via carrying out a chemical change. (ex burning H2 to in
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O2 to make H2O)
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,What is an extensive property? How is it measured ( using mass,
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volume, or density)? - CORRECT ANSWERS ✔✔a property that
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depends on the amount of matter in a sample(measured using mass
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an volume.
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What is an intensive property? How is it measured ( using mass,
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volume, or density)? - CORRECT ANSWERS ✔✔a property that
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depends on the type of matter in a sample, not the amount of
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matter. Measured using density
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are all types of properties measured using the same instruments? -
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CORRECT ANSWERS ✔✔No |\ |\




what is a measured quantity? - CORRECT ANSWERS ✔✔written as
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number with an appropriate unit and are essential to stating
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measurement correctly. |\




what is metric unit? - CORRECT ANSWERS ✔✔a metric unit is
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mass length volume. related decimally to the power of 10
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what is a revised metric system? - CORRECT ANSWERS
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✔✔international system of units called SI units |\ |\ |\ |\ |\ |\

, What is length measured in and what is the symbol for this
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measurement? - CORRECT ANSWERS ✔✔meters (m)|\ |\ |\ |\ |\




what is mass measured in? symbol - CORRECT ANSWERS
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✔✔kilograms (kg) |\




what is time measured in? symbol - CORRECT ANSWERS
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✔✔seconds (s) |\




what is electrical current measured in? symbol - CORRECT
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ANSWERS ✔✔ampere (A)
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what is temperature measured in? - CORRECT ANSWERS ✔✔(K)
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Kelvin


what is the amount of a substance measured in? symbol -
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CORRECT ANSWERS ✔✔Mole (mol)
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what luminous intensity measured in? - CORRECT ANSWERS
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✔✔candela (cd) |\




what is the symbol for tera and what does it mean in SI units? -
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CORRECT ANSWERS ✔✔T. SI units: 10^12
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