Chemistry, 26.03.2021 01:00, stephb1369
Hi. I am having a hard to understanding chemistry. currently the problem I'm working on is C2H4+3O2=2CO2+2H20. I need to know the total and exothermic/ endothermic.
Answers: 3
Chemistry, 22.06.2019 12:30, hayleyconsole
Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.
Answers: 3
Chemistry, 22.06.2019 16:50, Pookiev
Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.
Answers: 1
Chemistry, 22.06.2019 22:30, arodavoarodavo
Which is a characteristic of the electron sea model for metallic bonding? molecular orbitals overlap to produce bands. electrons flow easily between metal nuclei. electrons are in fixed positions in the orbitals. atomic nuclei are arranged in an irregular pattern.
Answers: 3
Hi. I am having a hard to understanding chemistry. currently the problem I'm working on is C2H4+3O2=...
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