Oxides of copper include CuO and Cu2O. You heat 1.51 g of a sample of one of these copper oxides in the absence of air and obtain 1.21 g of Cu. True or false: You must have had CuO.

14. many depressants reduce small muscle control, making it harder for a. you to steer b. your mind to consider complex problems c. the eye to scan, focus, or stay still d. the kidneys to filter alcohol out of the bloodstream

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true