[ Vocabulary ]
a physical system that does not allow transfer of matter in or out of the system
A. conservation of matter
B. closed system
C. reactant
D. chemical reaction
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Random Topics:
Subject – Predicate Each or EveryCorrelative ConjunctionThird ConditionalsBasic TensesModal VerbsPresent Perfect Simple and ContinuousSubject and Verbs AgreementModals for Advice, Obligation/Prohibition, Necessity and Lack of Necessity
Other quiz:
Grammar › ViewThey don’t need ____ that programme if they don’t like it
A. watching
B. to watch
C. watch
D. watched
Conjunction › View
Some English words have the same pronounciation………….
A. or they spell differently
B. unless spelled differently
C. though they are spelled differently
D. because of their difference in spelling
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