Listen During a laboratory activity, appropriate safety equipment was used and safety procedures were followed. A laboratory technician heated a sample of solid
KCIO, in a crucible to determine the percent composition by mass of oxygen in the compound. The unbalanced equation and the data for the decomposition of
solid KCIO3 are shown below.
KCIO(3) -- KC) 00
Lab Data and Calculated Results
Object or Material
empty crucible and cover
empty crucible, cover, and KCIO
KCIO,
crucible, cover, and KCl after heating
KCI
o
Mass
(9)
22.14
24 21
207
23.41
?
0.80
Based on the lab data, show a numerical setup to determine the number of moles of Oz produced. Use 32 g/mol as the gram-formula mass of O2

Naoki's bicycle has a mass of 10 kg. if naoki sits on her bicycle and starts pedaling with a force of 168 n, causing an acceleration of 2.8 m/s2, what is naoki's mass?

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .