Topics: Vocabulary
The same amount of matter exists before and after the change—none is created or destroyed
A. closed system
B. conservation of matter
C. chemical reaction
D. solution
Select your answer:
Random Topics:
Modal Verbs and ConditionalsCollocations & TensesGrammar: wishes and regretsModals & ConditionalsVerb Usage and GrammarPronouns ( Interrogative )Grammar - Punctuation of SentencesTravel VocabularyInversion + Passive VoiceGerunds and InfinitivesOther quiz:
Grammar › ViewThe color of the house ___ white.
A. are
B. is
C. is to
D. be
Grammar › View
Mary often ……… TV after dinner with her parents.
A. watch
B. watches
C. watched
D. to watch