[ 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:
Active-Passive VoicesVerb Tenses and Past ParticiplesThe Past SimpleAbilityTemporal Conjunctions and ConnectivesRegular and Irregular VerbsQuestion TagsModal "Have to"Present Simple, Present Continuous or Present PerfectOther quiz:
Grammar › View
Which is correct?
A. The dog is thin and thirsty.
B. The dog is fierce.
C. I love the dog.
D. It is not a dog.
Grammar › View
She ________ me for the present.
A. didn’t thanked
B. didn’t thank
C. don’t thanked
D. not thanked