Directions: Read each item carefully. Write only the letter of the correct answer for each question. Use your activity notebook for your answers.
1. How many grams of glucose are needed to prepare 400mL of 5% glucose solution? A. 5g B. 10g C. 14g D. 20g
2. What is the percentage concentration in the following solution given 2g sucrose in 80g water? A. 2.4% B. 2.5% C. 4.0% D. 97.6%
3. Sterling silver contains 95% silver. If a necklace made of sterling silver weighs 15g, what is the mass of the silver dissolved in the necklace? A. 1.6g B. 6.2g C. 9.0g D. 14.25g
4. What is the percent by mass concentration of a solution that contains 6.0g of sugar dissolved in 20.7g of water? A. 21.21% B. 22.21% C. 22.47% D. 22.74% 5. Brass is a copper-zinc alloy. If the concentration of zinc is relatively low, the brass has a golden color and is often used for inexpensive jewelry. If a 35.0g pendant contains 1.7g of zinc, what is the % by mass of zinc in brass? A. 4.7% B. 4.8% C. 4.9% D. 10% 6. A solution of benzene and toluene was prepared by adding toluene to benzene until the total volume becomes 135mL. By volume, the solution is 30.0% benzene. How much benzene, in mL, is in the solution? A. 39.5mL of benzene B. 40.5mL of benzene C. 41.5mL of benzene D. 42.5mL of benzene​