B - A chemist might determine the fat content in a candy bar.
1) Fatty acids stored in candy bars are (in fact) composed of chemical substances.
2) Choice A makes no sense. This activity belongs in the Biology field. Or if you're an animal activist, you might be interested in undertaking this as a hobby.
3) Choice C is absurd because either you're a Physicist who enjoys an occupation such as this, or you're just plain crazy.
4) Choice D is preposterous because either you're a Meteorologist, or a Geoscientist. Both of which have nothing to do with chemistry.
Answer:
Chemical
Explanation:
The change was chemical, because it can no longer be returned to the original form. You cannot get back the bubbles or fizz from the air.
They both involve the release of heat
Answer:
A. Hydrogen gas combining with oxygen gas to form water.
Explanation:
H2 is the symbol for Hydrogen in gaseous state and O2 is the symbol for Oxygen in gaseous state. H2O is the chemical formula of Water. It is clearly indicated in the equation that Hydrogen and Oxygen combining to form Water.
The arrow to the water indicate that the water is the product and it is NOT the decomposition reaction.
