Is cocl and hcl reaction exothermic or endothermic?

A color change happens during an experiment mixing two liquids. Is this a physical change or chemical change? a. A color change always indicates a chemical change. b. Color is a physical property, so it is only a physical change. c.

A compound containing sodium, chlorine, and oxygen is 25.42% sodium by mass. A 3.25 g sample gives 4.33*1022 atoms of oxygen. What is the empirical formula?

A 30.0 g sample of a metal was heated in a hot water bath to 80°c. it was then quickly transferred to a coffee-cup calorimeter. the calorimeter contained 100.0 g of water at a temperature of 20°c.

Which of the following will have the highest electronegativity? Silicon (Si), Phosphorus (P) or Arsenic (As). Explain your answer

Which molecules have one lone pair of electrons on the central atom? CH4, HCI, H2O, or NH3?

Which describes the polarity in a water molecule? a). partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms b).

To what temperature in kelvin will a 2.3 L balloon have to be heated to expand to a volume of 400 L Assume the initial temperature of the balloon is 25 degrees celsius.

In which changes of state do atoms lose energy?

Can you live without body tissue? This is a yes or no question, no explaining required, but you can add it if you want. : D

According to the graph, which activity has used the largest amount of water over the past twenty years?