Why is copper extracted from ores containing low percentage of copper compounds

How does water relative densities as a solid and a liquid differ from that most other substance?

How can iodine (Z = 53) have a higher atomic number yet a lower atomic mass than telluriurn (Z = 52) ?

The longest chain of atoms in a particular molecule consist of seven carbon atoms. Which name might this molecule be called? A. butane B. ethylene C. heptyne D. Septane

Durning a tornado you should get to anything except for

Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct? They both have seven protons in the nucleus. They both have the same mass number. They both have seven neutrons in the nucleus.

How many moles of methane are produced when 25.1 moles of carbon dioxide gas react with excess hydrogen gas?

Which reaction releases the greatest amount of energy per kilogram of reactants? A) neutron + uranium-235 ➡️ barium-141 + krypton-92 + 3 neutrons B) 2C + H2 ➡️ C2H2 C) C3H8 (g) + 5O2 (g) ➡️ 3CO2 (g) + 4H2O (l) D) NaOH (aq) + HCl (aq) ➡️ NaCl (aq) +

Name the hardest artificial substance known?

Suzzane has type A - blood. Which thpe of blood could she receive in a blood transfusion?

What can I draw or write about that's related to science?