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Chem 1020 - Exam 1 Review questions and answers graded A+ by experts 2024/2025
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Chem 1020 - Exam 1 Review questions and answers graded A+ by experts 2024/2025
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Chem 1020 - Exam 1 ReviewThe scientific method emphasizes reason as the way to understand the world - ANSFalse
A scientific law is a brief statement that summarizes past observations and predicts future ones
- ANSTrue
Law of conservation of mass states... - ANSMass can neither be created or destroyed
Scientific theories are also called models - ANSTrue
Pure substance - ANSSubstances made of only one type of atom or only one type of molecule
Mixture - ANSA substance made of two or more different types of atoms or molecules
Element - ANSA substance that cannot be broken down into simpler substances (represented
by chemical symbols)
Compound - ANSA substance made of two or more elements in fixed proportions (represented
by chemical formulas)
Pure substances consist of... - ANSElements and compounds
Homogeneous mixture - ANSConsistent properties for a given sample
Heterogeneous mixture - ANSDoes NOT have consistent properties throughout
Examples of a homo mixtures? - ANSclean air, brass, bronze, steel
Examples of hetero mixtures? - ANSrocks, soil, pizza
Examples of pure substances? - ANSsugar, CO, nitrogen
Examples of mixtures? - ANSfog, tea, steam + water
Compounds can be... - ANSbroken down into elements by chemical reactions
Elements can NOT be... - ANSbroken down further by chemical reactions
Physical change - ANSInvolves changing the form but not the composition of a substance
Chemical change - ANSinvolves the change of composition of a substance
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