Chemistry, 31.03.2021 19:10 rosepederson80
Did you know that the night sky is an illusion? Stars are so far away that it takes millions or billions of years for the light to shine on the Earth. This means that when we see the stars, the 'stars' we are seeing aren't actually there anymore. They have moved but since the light took so long to get to Earth, the stars aren't there. Scientists think that if we put a giant mirror 20 thousand light-years from earth and looked into it, we would be able to see the dinosaurs. This proves that time travel is possible and we just don't have the technology yet.
Answers: 1
Chemistry, 22.06.2019 13:30, kassandrarosario1115
How many protons, electrons, and neutrons are in each of the following isotopes? a. zirconium-90 b. palladium-108 c. bromine-81 d. antimony-123
Answers: 1
Chemistry, 23.06.2019 10:30, genyjoannerubiera
4al + 3o2 → 2al2o3 what does the "3" in front of o2 stand for? a) it indicates that there are 5 oxygen atoms after you add the coefficient and the subscript. b) it indicates that that there are are total of 6 oxygen atoms all bonded together as a single molecule. c) it indicates that there are 3 oxygen molecules chemically bonded to each other in the reaction. d) it indicates that there are 3 separate oxygen molecules in the reaction.
Answers: 2
Chemistry, 23.06.2019 11:30, nadine6085859r
Which of the following is a property of nonmetals? a. nonmetals are ductile. b. nonmetals have a shiny luster. c. nonmetals have high density. d. nonmetals are nonconductors.
Answers: 1
Did you know that the night sky is an illusion?
Stars are so far away that it takes millions or bil...
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