Acopper coin with a mass of 6.30 grams changes temperature in the sunshine from 20.0°c to 32.0°c. how much energy is transferred? the specific heat capacity of copper is 0.377 joules/gram degree celsius. express your answer to three significant figures. 

Identify the electromagnets with poles that are reversed from the electromagnet shown above

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?

Which statement is true about hcl? (5 points) select one: a. it is a salt because it increases the concentration of metallic ions. b. it is a salt because it is formed by the reaction of an acid and a base. c. it is an acid because it increases the concentration of hydroxyl ions. d. it is an acid because it increases the concentration of hydronium ions.