This problem can be solved by using oxidation states. The oxidation state is based on the electrons an atom loses or gain, or appears to use when forming compounds.To find the formula for Copper (I) Sulfide, we have to first consider the individual ions that come together to form it. Copper (I) is an ion of copper that has a charge of +1, i.e 
. Sulfur is an element in group 6 of the periodic table. The sulfur ion has a charge of -2, i.e 
. To form Copper (I) Sulfide, which is electrically neutral, we need 2 Copper (I) ions and 1 sulfur ion.
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The reaction is represented by the equation below
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The correct answer is (C)
Answer:
Las propiedades físicas, como la dureza y el punto de ebullición, y los cambios físicos, como la fusión o la congelación, no implican un cambio en la composición de la materia.
Explanation:Creo que es correcta
Newton’s first law of inertia
Less force, same work
