Balancing Chemical Equations — Unit test Answers

What is a limitation of using a chemical formula, such as C6H12O6, to represent a compound?

What does the chemical formula C3H6O2 tell about a molecule of the compound it represents?

Suna passes an electric current through a sample of clear, colorless, and odorless liquid. As the experiment continues, bubbles form, and the volume of liquid decreases. Suna collects samples of two colorless, odorless gases that bubble out of the liquid. One of the gases burns. Neither the original liquid nor the other gas burns.Which is the best explanation of her results?

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

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

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

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?

Which term best describes all atoms in ionic bonds?

Lionel has a hot plate, a thermometer, a container of water, a spoon, and a small hammer. Using these tools, Lionel can test several properties of an ionic compound.Which property of the compound will he not be able to test?

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

The first chart shows the effect of the normal breakdown of material from reactants to products. The second chart shows the same reaction but with an added modification.

Mora measures the speed of the particles in a solid mass. She wants to speed up the action. Which action will allow her to do so?

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.