13) Ten glass beads are lined up end to end along a ruler. The total length of t

Question

13) Ten glass beads are lined up end to end along a ruler. The total length of the glass beads is 13.2 cm. What is the end along volume of 1 glass bead in cm3? A) 77.1 B) 9.63 C) 1.20 D) 7.30 E) 0.228 14) Suppose 40 mL of 0.40 M Naclac) is mixed with 6.0 mL of DI H20. What is the concentration of the dilute solution? A) 0.24 M B) 0.12 M C) 0.040 M D) 0.67 M E) 0.16 M 15) An aqueous solution is sprayed into a Bunsen burner flame turning the flame bright red. The species most C) Cu2+ 16) 5 glass marbles having a mass of 24.24 g are placed in a 25 mL. graduated cylinder containing 10.0 ml of H20 likely responsible for the observed color is A) Ba2+ B) Lit D) Nat The volume of water rises to 18.3 mL. What is the average density of 1 marble in g/mL? A) 2.20 B) 0.440 C) 3.65 D) 3.12 E) 2.92 17) Calculate the %Cu by mass in Cu3N A)872% B) 29.1% C)93.2% D) 81.9% E) 44.1%

Explanation / Answer

13)

length of ten beads = 13.2 cm

So,

diameter of bead = 13.2/10 = 1.32 cm

radius, r = diameter / 2

= 1.32 cm / 2

= 0.66 cm

volume = (4/3)*pi*r^3

= (4/3)*pi*(0.66 cm)^3

= 1.20 cm^3

Answer: C

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