Is melting a piece of wax a physical or chemcial change

In which of the following are the symbol and name for the ion given correctly? a) Fe^2+: ferrous ion; Fe^3+: ferric ion b) Sn^2+: stannic ion; Sn^4+: stannous ion c) Co^2+: cobalt (II) ion; Co^3+: cobaltous ion d) Pb^2+: lead ion;

What is the transmittance of 35.3%

Nickel has chemical symbol Ni and the atomic 28. How many protons, neutrons, and electronic would be found in an atom of nickel-78

Which is a chemical property of vinegar?

Which atoms exist as diatomic molecules?

Number of hydrogen atoms in NaC2HO4

Calculate the pH for an acid that has a [H+] of 5.8 x10^-11 M.

Complete the lewis dot structure for h2co (in which both h atoms are bonded to c).

Do substances have to be cold to freeze?

Which statement is true of the carbon atoms that make up a diamond? A. They can slip past one another slowly. B. They are always vibrating in place. C. They vibrate only when they are heated. D. They are locked in place and do not move at all.