why do the heating, cooling and weighing process need to be repeated until a constant mass is obtained in copper (ii) oxide experiment​

From the options provided for each element below, choose the properties that it may have based on its location in the periodic table fluorine (f): highly reactive nonmetal shiny a conductor

How does a large body of water, such as the ocean, influence climate?

Scientists are often interested in knowing the molar heat of combustion – the heat released during the combustion of one mole of a substance. use the periodic table to find molar masses. how many moles of ethanol are present in the sample?