Is a candle melting in the hot sun a chemical or a physical change?

What is the product of magnesium metal + silverchloride?

Are these mixtures or pure substance? 1. water 2. blood 3. the oceans 4. iron 5. brass 6. uranium 7. wine 8. leather 9. table salt (NaCl)

If the moles and temperature of a gas are held constant, the pressure of a gas doubles when: Volume is halved Volume is quadrupled Volume is doubled Volume is also held constant

In the lewis structure of the iodate ion, io3-, that satisfies the octet rule, the formal charge on the central iodine atom is

Which substances contain based lemon, tonic water, soap

Which elements can be found in the sun? a. hydrogen and oxygen b. helium and oxygen c. hydrogen and helium d. hydrogen and nitrogen?

A sample of hydrogen gas at 2.0 atmospheres and 273 k occupies a volume of 5.0 liters. the gas sample is completely transferred to a 10.0-liter sealed, rigid container.

To make sure that the white powder was all sodium chloride and not mixed with sodium hydrogen carbonate, would you need to add a little less or a little more hydrochloric acid to the reaction?

A 10.0 gram sample of h2o at 23.0c absorbs 209 joules of heat. what is the final temperature

What does the sum of the protons and neutrons in an atom equal