Chemistry and Atoms for Nursing School Entrance Exam Practice Problems (page 3)
The study guide for these practice questions can be found at:
- Which of the following statements about atoms is true?
- They have more protons than electrons.
- They have more electrons than protons.
- They are electrically neutral.
- They have as many neutrons as they have electrons.
- What is the mass number of an atom with 60 protons, 60 electrons, and 75 neutrons?
- What is the atomic number of an atom with 17 protons, 17 electrons, and 20 neutrons?
- Two atoms, L and M, are isotopes. Which of the following properties would they NOT have in common?
- atomic number
- atomic mass
- chemical reactivity
- the number of protons in the nucleus
- An atom with an atomic number of 58 and an atomic mass of 118 has
- 58 neutrons.
- 176 neutrons.
- 60 neutrons.
- 116 neutrons.
- According to Dalton's theory, the only way a compound can consist of its elements in a definite ratio by mass is that it is made from the elements in
- a definite ratio by volume.
- a definite ratio by number of atoms.
- multiple whole-number ratios by mass.
- multiple whole-number ratios by volume.
- Which of the following is a mixture?
- sodium chloride
- rice and beans
- magnesium sulfate
- The mass of an atom is almost entirely contributed by its
- electrons and protons.
- If an atom consists of 9 protons and 10 neutrons, its
- atomic number is 10.
- mass number is 10.
- number of electrons is 9.
- electrical charge is 9.
- Which of the following is true of an atom?
- It consists of protons, neutrons, and electrons.
- It has a nucleus consisting of protons, neutrons, and electrons.
- The protons are equal in number to the electrons, so the nucleus is electrically neutral.
- All of the above are true.
- c. Atoms are electrically neutral; the number of electrons is equal to the number of protons.
- b. Mass number is the number of protons plus the number of neutrons: 60 + 75 = 135.
- d. The atomic number is the number of protons—in this case, 17.
- b. By definition, isotopes have different numbers of neutrons. Therefore, they differ in atomic weight.
- c. The number of neutrons is equal to the atomic mass minus the atomic number (the number of protons): 118 – 58 = 60.
- b. This is part of Dalton's atomic theory.
- b. Rice and beans are not chemically combined and can be separated into their constituent parts by physical means.
- a. The protons and neutrons of an atom are found in the nucleus.
- c. Atoms are electrically neutral. If there are 9 protons, each with a +1 charge, 9 electrons with a –1 charge are needed to balance.
- a. An atom consists of protons, neutrons, and electrons; the nucleus contains protons and neutrons. The protons are equal in number to the electrons, but the nucleus itself is not electrically neutral.
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