A sample of copper was heated to a temperature of 89.0°C. The piece of copper was then dropped into 55.0g of water, initially at 23.0°C. The temperature of the water rose to 27.2°C. Assuming that all the heat lost by the copper is absorbed by the water, calculate the mass of the copper. (The specific heat of copper is 0.385 J/g°C). Please show work

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

An experimental procedure requires a 10 ml of acid to be dissolved