During a reaction, an element loses 4.8 × 10-28 kg of mass. How much energy (in Joules) is released?

Which is an example of a reversible physical change?

You have a sample of a metal, the sample is exactly 6.02 x 1023atom, if the sample has a mass 55.85 what metal is your sample made of?

An unknown substance has been shown to have metallic bonds. which of the following is most likely a property of this substance? a. low conductivity b. low boiling point c. high malleability d. high solubility in water