Chemistry, 01.02.2021 23:40, faithrawlins14
What statement best supports the representation of the model below?
Hydrogen
-Hydrogen
Oxygen
(Not drawn to scale)
O it is a compound because it has two bonds
O it is a compound because it is made of two different atoms
o it is a mixture because it has two gases
o it is an element because it is water
Answers: 3
Chemistry, 21.06.2019 22:50, rndschopplein
Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas. in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point
Answers: 1
Chemistry, 22.06.2019 05:50, mrylenastewart
What are transitions between a liquid and a solid called? identify which way they are transitioning
Answers: 2
What statement best supports the representation of the model below?
Hydrogen
-Hydrogen
...
-Hydrogen
...
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