Anugget of gold with a mass of 521 g is added to 50.0 ml of water. the water level rises to a volume of 77.0 ml. what is the density of the gold?

a). 10.4g/ml
b). 6.77g/ml
c). 1.00g/ml
d). 0.0518g/ml
e). 19.3g/ml

Agas at 155 kpa and standard temperature has an initial volume of 1.00 l. the pressure of the gas rises to 500 kpa as the temperature also rises to 135°c. what is the new volume? 2.16 l 0.463 l 0.207 l 4.82 l

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

The identities of substances are the same before and after which type of change