What element forms an ion with an electronic configuration of [kr] and a –2 charge?

Write two balanced equations 1. dissolving of solid sodium hydroxide in water 2. the reaction of sodium hydroxide solution with hydrochloric acid

How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?