Medgar Ever College CHEML 201-005 Spring 2017 LAB FINAL 1. What is the percentag

Question

Medgar Ever College CHEML 201-005 Spring 2017 LAB FINAL 1. What is the percentage of Sio2 in a2.56 g sample mixture if 2.25 gif Sion has been recovered? a. 48.8% b. 68.25 c. 34.9% d. 87.9% 2. A mixture was found to contain 1.05g of SiO2, 0.69 g of cellulose, and 3.17 gof 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 iodine and sand is a. Filtration b. Decantation c. Sublimation d. Distillation 4. All the following are examples of physical properties except? a. Size b. Boiling point c. Melting point d. Flammability 5. s the gain of electron whiles. is the loss of electron. a. Oxidation, reduction b. Reduction, oxidation c. Precipitation, oxidation d. Reduction, precipitation

Explanation / Answer

Answer

1. d = (mass of substance/total mass)*100

2. b = (mass of substance/total mass)*100

3. c = iodine is sublimating substance

4. a = Size is not physical property

5. b = De-electronation is oxidation , electronation is reduction

Related Questions

Navigate

• Browse (All)
• Browse M
• Subjects

---