Acopper ore containing 4.3 wt% water, 10.3 wt% cuso, and 85.3 wt% rock is fed to a staged counter current extractor at a rate of 11.7 tons per hour. we wish to recover 98% of the copper sulfate using pure water as the fresh solvent. the solution produced is to be 10 wt% copper sulfate and 90 wt% water. if after each stage 1 ton of inert rock retains 2 tons of water plus the dissolved copper sulfate, how many stages are required?

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas. in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead

Amixture with the same composition throughout is!