Metals are extracted from their ores.

Many copper ores contain only 2% of copper compounds.

Copper is now extracted from ores containing a low percentage of copper compounds.

Suggest two reasons why.

What 2 things are conserved in every reaction?

What forms of energy are involved when snow on a mountain breaks loose, resulting in an avalanche?

A 390 mL solutions of 4.6 M HCl is left out over the weekend and 74 mL of solvent evaporates. What is the new concentration of HCl?

The speed of a wave on a guitar string is 100 m/s, and the frequency is 1,000 Hz. what is the wavelength of the wave?

Which list of elements contains only metals? A. carbon, iodine, tin B. tin, copper, carbon C. cesium, iron, copper D. iodine, carbon, argon

Which three elements have strong magnetic properties? A. boron, carbon, and silicon B. lithium, sodium, and potassium C. iron, cobalt, and nickel D. neon, argon, and krypton

What are the spectator ions in the solution after the precipitation of an insoluble sulfate compound from AgNO3 (aq) and K2SO4 (aq) ?

How are chemical formulas of binary ionic compounds generally written? a cation on left, anion on right b anion on left, cation on right c roman numeral first, then anion, then cation d subscripts first, then ions?

Given a fixed amount of gas held at constant pressure, calculate the volume (in L) it would occupy if a 3.50 L sample were cooled from 90.0oC to 30.0oC.

Which of the following is not required for osmosis to occur? View Available Hint (s) Which of the following is not required for osmosis to occur? selectively permeable membrane water concentration gradient cellular energy