[ 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
Select your answer:
Random Topics:
Cardiology ServicesVerb ConjugationPresent simple & ContinuousGrammar - Present PerfectGrammar: AgreementGerund vs InfinitiveComparative AdverbPresent Perfect Simple & Present Perfect ContinuousAdjectives-Comparison, SuperlativeOther quiz:
COUNT - NONCOUNT NOUNS › ViewLet me give you some advice: Walk for half an hour every day.
A. COUNT NOUN
B. NON-COUNT NOUN
Grammar › View
The mouse is _____________ behind the tree.
A. hide
B. hides
C. hiding