Chemistry, 30.01.2020 18:51 ayoismeisjuam
1. a substance that can be separated into two or more substances only by a chemical change is a(n)
solution
element
mixture
compound
2.
which of the following materials is a substance?
air
gasoline
stainless steel
silver
3.
the first figure in a properly written chemical symbol always is
boldfaced
capitalized
italicized
underlined
4.
which of the following represents a compound?
h
h-3
h2o
o-16
5. what do chemical symbols and formulas represent, respectively?
elements and compounds
atoms and mixtures
compounds and mixtures
elements and ions
Answers: 1
Chemistry, 21.06.2019 13:30
One of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description?
Answers: 3
Chemistry, 22.06.2019 07:30
The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.
Answers: 2
Chemistry, 22.06.2019 07:40
The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder
Answers: 3
1. a substance that can be separated into two or more substances only by a chemical change is a(n)...
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