Spring 2017 LAB FINAL What is the percentage of SiO; in a 2,56 g sample mixture

Question

Spring 2017 LAB FINAL What is the percentage of SiO; in a 2,56 g sample mixture if 2.25 g ir SiO, has been recovered? a, 48.8% b. 68.25% c. 34.9% d. 87.9% 2. A mixture was found to contain 1.03g of Sioi,0,69 g of cellulose, and 3.17 g of calcium carbonate. What is the percentage of calcium carbonate in the mixture? a, 53.49% b. 64.56% c. 55.50% d. 23.98% 3. The best technique for separating a mixture of naphthalene and sand isurn a. Filtration b. Decantation c. Sublimation d. Distillation All the following are examples of physical properties except? a. Size b. Boiling point c. Melting point d. Flammability 4. 5..is the loss of electron whiles.is the gain of electron a. Oxidation, reduction b. Reduction, oxidation c. Precipitation, oxidation d. Reduction, precipitation The simplest whole number ratio of an atom is referred to as a. Empirical formula b. Formula weight c. Molecular formula d. Structural formula 6.

Explanation / Answer

1. % OF SiO2 = 2.25/2.56*100 = 87.9%

answer: d

2. % of CaCO3 = 3.17/(3.17+0.69+1.05)*100 = 64.56%

answer: b

3. answer: b

4. answer: d

5. answer: a

6. answer: a

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