1. An 18.0-g sample of magnesium is completely burned in the presence of air to form magnesium oxide. What is the mass of the magnesium oxide obtained?2. What is the formula for copper(II) phosphate?3.How many oxygen atoms are there in a formula unit of4. What is the state of matter for an object that has a definite volume but not a definite shape?5. How many neutrons are there in the nickel-58 nuclide?atoms. What is the atomic mass of X?7.8. What are two types of pure substances?9. Solve the expression 10. What are cathode rays?11. The figure below represents the bulls eye target for an archer. The black dots represent where the archer’s arrows hit:1213. How many significant figures are there in the number 0.04560700? ________________14. An irregularly shaped metal was weighed by the following difference:•
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