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.

Name an object that the magnet would repel

In a double replacement reaction copper (II) chloride combines with sodium nitrate. When a student combines 3 grams of copper (II) chloride react with 4 grams of sodium nitrate, how much sodium chloride is produced?

Select the correct responses to the questions from the drop-down menus. Which wind blows cool air inland during the day? Which wind blows cool air toward the sea at night? Which winds blow steadily from specific directions and over long distances?

Exactly 5000 mL of air at 223K is warmed and has a new volume of 8.36 liters. What is the new temperature? 100 K 373 K 273 K 123 K

Who discovered the electron?

In a chemical reaction, atoms are created/rearranged. The atom are joined together in the same/different arrangements after the reaction. The total number of each type of atom is greater/less/The same after the reaction.

Is dry ice subliming, endothermic or exothermic?

An atom that gains or loses an electron has a net electric charge and is called a/n A. ion. B. electron. C. proton. D. neutron.

Write the name of the following compound NH^3

Relate How do atoms relate to cells?