Determine the number of calories needed to raise the temperature of the copper from 10.0°C to 100.0°C. (The specific heat of copper is 0.0921 cal/goC)

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Which of the following units is not an official si unit

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro