Isotopes have ________ a. the same number of protons but different numbers of el

Question

Isotopes have ________ a. the same number of protons but different numbers of electrons. b. the same number of neutrons but a different number of protons. c. the same total number of protons and neutrons. d. the same number of protons but a different number of neutrons. e. the same atomic mass. Based on the following figure, which of the measurements listed is the best estimate of the length of the object? a. 1.8 cm b. 1.81cm c. 1.90 cm d. 1.9 cm e. 1.810 cm What is the correct symbol for an electron? a. ^0 _1 e b. ^0 _0 e c. ^1 _-0 e d. ^0 _-1 e e. ^1_-1 e Which of the following does not show a correct relationship between units? a. 1000 grams = 1 kilogram b. 1 nanometer = 1 times 10^-9 meters c. 1 gigabyte = 1 times 10^9 bytes d. 1 times 10^-6 micro liters = liter e. 1 times 10^-5 second = 1 millisecond An clement _______ a. can be separated into its components by physical methods. b. exists only as atoms, not as molecules. c. cannot be separated into simpler substances by chemical methods. d. can also be a compound. c. always has the same chemical properties regardless of its source. If you had equal masses of each of the following substances, which would occupy the greatest volume? a. water (d = 0.997 g/mL) b. beeswax (d = 0.960 g/mL) c. ice (d = 0.917 g/mL) d. aluminum (d = 2.70 g/mL) c. cocoa butter (d = 0.910 g/mL) What is the formula for the ionic compound formed when calcium and bromine combine? a CaB_2 b. Ca_2 Br c. CaBrO d. CBr e. CaBr_2 Which one of the following is NOT an intensive physical property of a pore liquid? a. boiling point b. mass c. density d. color e. conductivity

Explanation / Answer

4) Isotopes of an element have the same number of electrons. Since the electrons and protons are equal in numbers, hence isotopes have the same number of protons. The isotopes have different masses and the difference in mass is due to the difference in number of neutrons. Hence, (d) is the correct option.

Ans: (d)

5) The smallest division of the scale is 0.10 cm and the length of the object measures 19 units on the scale; therefore, the length of the object is 1.90 cm.

Ans: (c)

6) An electron has one unit of negative charge and negligible mass. Therefore, the charge on an electron is -1 while the mass is 0. Therefore, (d) is the correct answer.

Ans: (d)

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