Which are the most common alkaline earth metals? A. magnesium and calcium

B. gold and silver

C. potassium and sodium

D. iron and nickel

Aball bearing at 220.0 °c is dropped into a cup containing 250.0 g of water at 20.0 °c. the water and ball bearing come to a temperature of 30.0 °c. what is the heat capacity of the ball bearing in j/°c? (hint: how are the algebraic signs of q related for the ball bearing and the water? )

Language is not the only way that humans communicate. describe how we use sound, touch, chemicals, and sight to communicate. need answer asap

How many minutes does light need to travel from the sun to jupiter?