4..The following pairs of substances represent heterogeneous mixtures.

For each pair, describe the steps you would follow to separate the components and collect them. Explain.
(a) sugar and sand
(b) iron filings and sand
(c) sand soaked with oil


7.if someone gave you a sample of a metallic element, what physical properties might you use to identify the element? Assume you have a reference, such as the Handbook of Chemistry and Physics that lists physical properties of the elements. Cite four distinct properties.


8..10 g of Barium hydroxide is added to 500 mL of solution of 1 Molar solution sulfuric acid. (Hint molar = mol/L or mol/"vol.")
Write the complete and net ionic balanced equation with states. Would consider this a physical or chemical change and why? Would the barium hydroxide be complete consumed base on the number of moles of acid to base.