When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 19.2 g of carbon were burned in the presence of 68.9 g of oxygen, 17.7 g of oxygen remained unreacted. What mass of carbon dioxide was produced?

How to determine which step is the slow step in a reaction?

A substance decays so that the amount a of the substance left after t years is given by: a = a 0 · (0.9) t, where a 0 is the original amount of the substance.

When planning your oral presentation, what can you do to prepare for the presentation? A) practice reading your presentation from an index card. B) practice your presentation with your eyes closed.

A chemist obtains 500.0 mL of a solution containing an unknown concentration of calcium iodide, CaI2. He pipets 15 mL of this solution into a 100 mL volumetric flask and dilutes to the mark.

Nancy wants to find out how the steepness of a hill's slope affects the amount of soil that erodes from it. She has soil, a long pan, and a pile of books with which to build a model hillside. She has a watering can to model rainfall.

Model describe how you would show j. j. thomson's model of the atom using small beads and clay

Switching one substance for another is called ... ? a) displacement b) synthesis c) decomposition d) oxidation

C2h4 + O2 - CO2 + H2O If we start with 20 grams of CH4, how many moles of CO2 will form?

How does chemical energy relate to the atom and how can we use it?

A positively charged atom is known as a cation. A cation will? ... A) have more protons B) have to same number of protons and electrons. C) Be the same as a neutral atom. D) have more electrons.