Answer:
Explanation:
Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate). Crystals, in general, are pure substances. Tin, sulfur, and diamond are examples of pure substances that are chemical elements.
D. Cycloalkene
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Answer:

Explanation:
The unbalanced nuclear equation is

It is convenient to replace the question by an atomic symbol,
, where <em>x </em>= the atomic number, <em>y</em> = the mass number, and Z = the symbol of the element.

Then your equation becomes

The main point to remember in balancing nuclear equations is that the <em>sums of the superscripts and of the subscripts</em> must be the same on each side of the equation.
Then
93 – 1 = <em>x</em>, so <em>x</em> = 92
232 + 0 = <em>y</em>, so <em>y</em> = 232
Element 92 is uranium, so the nuclear equation becomes
