Which type of reaction is represented by this graph?

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

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 states of matter have particles that move independently of one another with very little attraction?