Unit 10: #37-40

Question 1

37. What mass of sodium hydroxide would be needed to make a 4.5M solution in 350mL of water?

Answer 1

63gNaOH

Question 2

38a. State the symbol, atomic number, mass number, and the number of neutrons for carbon-12.

Answer 2

12/6 C,
6,
12,
6

Question 3

38b. State the symbol, atomic number, mass number, and the number of neutrons for carbon-13.

Answer 3

13/6 C,
6,
13,
7

Question 4

38c. State the symbol, atomic number, mass number, and the number of neutrons for magnesium-25.

Answer 4

25/12 Mg,
12,
25,
13

Question 5

38d. Which of the following are isotopes?
Carbon-12, Carbon-13, Magnesium-25

Answer 5

Carbon-12 and Carbon-13

Question 6

39. Using the spectrograph below to find the atomic mass of strontium.

Answer 6

87.72 amu OR 87.72 g/mol

Question 7

40. What type of reaction is the decay of uranium-238 to thorium-234? What’s the decay equation?

Answer 7

alpha,
238/92 U -> 234/90 Th + 4/2