REVIEW J.U3L1-Chemical Reactions Question Preview (ID: 58924)


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A student observed a precipitate form during a chemical reaction. What is her CLAIM?
a) Bubbles of gas floated to the top of a solution.
b) The color of a liquid changed when a solid was added to it.
c) Steam rose from a flask when a powder was added to a liquid.
d) A solid sank to the bottom of a container when two liquids were mixed.

Flammability and reactivity are examples of physical properties. T or F?
a) TRUE
b) FALSE
c) flammability means it can catch fire
d) flammability can be dangerous around flames

What is your REASONING for what occurs in a chemical reaction?
a) The atoms in the reactants were regrouped into different molecules to form the products.
b) The atoms in the products were regrouped into different molecules to form the reactants.
c) The atoms in the products were destroyed and new molecules appeared to form the reactants.
d) The atoms in the reactants were destroyed and new molecules appeared to form the products.

Which statement indicates that a chemical reaction has taken place?
a) A loud noise is produced by crushing a water bottle
b) An odor is produced by burning maple syrup
c) A puddle is produced by melting ice
d) A shard of glass is produced by breaking a bottle

A precipitate is a SOLID produced in a chemical reaction. T or F?
a) TRUE
b) FALSE
c) precipitates don't exist in nature
d) precipitates don't occur in the lab

To separate a mixture, Austin uses a magnet, boiling water, and a filter. Which statement is true about his process?
a) Austin uses only chemical changes to separate the mixture’s components.
b) Austin uses both physical and chemical changes to separate the mixture’s components.
c) Austin uses neither physical nor chemical changes to separate the mixture’s components.
d) Austin uses only physical changes to separate the mixture’s components.

Which real-life process does indicate a chemical reaction is taking place?
a) chopping weeds
b) heating a cup of tea
c) cooking an eggplant
d) drying clothes in the dryer

Which property could be used to identify a specific substance?
a) volume
b) mass
c) weight
d) density

Which laboratory EVIDENCE is not an indicator of a chemical reaction?
a) change in volume
b) change in odor
c) change in color
d) energy released as heat or light

Chemical properties define how a substance CHANGES into different substances. T or F?
a) TRUE
b) FALSE
c) chemicals cannot change
d) substances cannot change

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