Two changes are described below.
A. A green banana turns yellow and ripens.
B. A layer of ru...
Two changes are described below.
A. A green banana turns yellow and ripens.
B. A layer of rust forms on an iron nail.
Which statement is true about the two changes? (5 points)
Both are chemical changes because new substances are formed.
O Both are physical changes because only the physical state of the substances change.
A is a physical change due to a change of state, but B is a chemical change because new molecules are formed.
ОО
A is a chemical change due to a change of state, but B is a physical change because new molecules are formed.
Answers: 2
Chemistry, 22.06.2019 12:00, daytonalive83481
Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.
Answers: 1
Chemistry, 23.06.2019 04:30, Har13526574
Two liquids are poured into a beaker. after a few seconds, the beaker becomes warm. which of the following best describes this reaction? a. an exothermic reaction b. a decomposition reaction c. an endothermic reaction d. a single-displacement reaction
Answers: 1
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