Two elements, and , combine to form two binary compounds. in the first compound, 28.0 g of combines with 3.00 g of . in the second compound, 7.00 g of combines with 4.50 g of . show that these data are in accord with the law of multiple proportions. if the formula of the second compound is , what is the formula of the first compound?

Which substances have the lowest melting points: ionic covalent, or metallic

This drawing shows a human body system. what is the primary function of this body system?

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.