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Category:
Chemistry
A few years ago a young chemist in Vienna, Austria, wanted to see just how permanent the gold was in his wedding band. The ring was 1818 -carat gold. ( 1818 -carat gold is 75\mathrm{\%}75% gold with the remainder copper and silver.) One week after his wedding day he took off the ring, cleaned it car...
Coursepivot August 22, 2022 21:20
Part 1: Step 1 of 2 Chemical symbols are defined as shorthand abbreviations for elements which are derived based on their Greek or Latin origin of its name, or the (View full solution)
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Category:
Chemistry
The following photo shows the element potassium reacting with water to form the element hydrogen, a gas, and a solution of the compound potassium hydroxide. (a) What states of matter are involved in the reaction? (b) Is the observed change chemical or physical? (c) What are the reactants in this rea...
Coursepivot August 22, 2022 21:16
A. Explanation States of matter: It refers to different forms in which matter can exist. Solid, liquid and gas are the states of matter. Potassium exists in the solid state (View full solution)
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Category:
Chemistry
A copper-colored metal is found to conduct an electric current. Can you say with certainty that it is copper? Why or why not? Suggest additional information that could provide unequivocal confirmation that it is copper.
Coursepivot August 22, 2022 21:17
Here is the step-by-step explanation, verified by an educator: Step 1 of 2 Conductors are substances that allow the flow of current through them. In conductors, the valence electrons are (View full solution)
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Category:
Chemistry
The photo below shows elemental iodine dissolving in ethanol to give a solution. Is this a physical or chemical change?
Coursepivot August 22, 2022 21:18
Here is the full solution including the answer and explanation. Explanation "Physical change" is correct "Chemical change" is incorrect Substances around us may undergo two kinds of changes: physical change (View full solution)
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solution
Category:
Chemistry
Suggest a way to determine if the colorless liquid in a beaker is water. How could you discover if there is salt dissolved in the water?
Coursepivot August 22, 2022 21:14
Explanation Boiling point is the temperature where the vapor pressure of a liquid becomes equal to the pressure surrounding the liquid and the liquid changes into vapor. The process in (View full solution)