39 is two fifths of what number

When aluminum oxide reacts with hydrofluoric acid, how many moles of aluminum fluoride are produced when 150 grams of aluminum oxide are used?

Chemical reaction to form products this chemical equation represents one such reaction the coefficient for one of the reactants or products is incorrect which part of the chemical equation is incorrect. 2c⁴h¹⁰ + 10o² - > 8co² + 10h²o

Area of society was strengthened by Linnaeus's contribution to science?

Which layer of Earth is the densest and why is that so? A. The outer core is densest due to gravitational compression. B. The outer core is densest due to generation of radiogenic heat. C. The outer core is densest due to accretion. D.

True or false: Tectonic Plates move quickly so it is difficult to notice.

If something is in high resolution you can see and object but not very clearly. True or False.

Which change might cause a cold spell in the northern united states

Kipps appratus is for what?

Which of the following statements about protons are true? Protons have twice the mass of neutrons. Protons have the same magnitude of charge as electrons but are opposite in sign. Protons have a charge of 1+.

What is true of an acidic solution at room temperature?