Regents Chemistry - Year End Review

Front

What is the classification of the element in Group 14, Period 3 of the Periodic Table?

Back

Metalloid

Front

What is the effect of a catalyst on a chemical reaction?

Back

It provides a new reaction pathway that results in a lower activation energy.

Front

In the reaction 3CuCl2(aq) + 2Al(s) → 3Cu(s) + 2AlCl3(aq), what is the change in oxidation number of copper?

Back

+2 to 0

Front

How do you calculate the concentration of a solution in parts per million (ppm)?

Back

ppm = (mass of solute in grams / mass of solution in grams) x 10^6

Front

What is a benefit of using fission reactions?

Back

Large amounts of energy are produced per mole of reactant.

Front

Define metalloid.

Back

An element that has properties of both metals and nonmetals.

Front

What is activation energy?

Back

The minimum energy required for a chemical reaction to occur.

Front

What is the significance of oxidation numbers in chemical reactions?

Back

They indicate the degree of oxidation or reduction of an element in a compound.

Front

How is concentration expressed in parts per million (ppm)?

Back

It is expressed as the mass of solute per million parts of solution.

Front

What is the role of a catalyst in a chemical reaction?

Back

To speed up the reaction without being consumed in the process.