Lab: Rate of Chemical Reactions — Unit test Answers

Which statement best describes the difference between endothermic and exothermic reactions?

Ciara’s bike has rusted, which means that the iron in the metal changed to rust.

Which represents an endothermic reaction?

Nio conducts a science experiment. He puts yeast into a bottle with water and sugar, and then caps the bottle with a balloon. He returns two hours later and notices there are bubbles on the surface of the mixture in the bottle and that the balloon has inflated, but there are no other apparent changes.

For the equation BaCl2 + Na2SO4 → BaSO4 + 2NaCl, how many chlorine atoms are on the reactants side and on the products side?

When balanced, which equation would have the coefficient 3 in front of any of the reactants?

Which type of reaction is Mg + S → MgS?

In the reaction C + O2 → CO2, 18 g of carbon react with oxygen to produce 72 g of carbon dioxide. What mass of oxygen would be needed in the reaction?

What are the coefficients for the reaction _Cl2O5 + _H2O → _HClO3 once it is balanced?

Lars is balancing equations with his study group. He is unsure about one equation because each member of the study group came up with a different answer. Which is the proper way to balance the equation Ca(OH)2 + H3PO4 → Ca3(PO4)2 + H2O?

What is produced during the replacement reaction of Cu(NO3)2 and Zn?

The equation for water is H2 +O2 → H2O. To balance the equation, which coefficient should be placed in front of H2 and H2O?

Which best represents the reaction of calcium and zinc carbonate (ZnCO3) to form calcium carbonate (CaCO3) and zinc?

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What else is produced during the replacement reaction of magnesium and hydrochloric acid?Mg + 2HCl H2 + ________