Chemical Reactions Test 1

The questions in your test are set out below. You do not lose marks for wrong answers. Once you have completed the test, click Submit.

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1. Atom "X" has 34 neutrons, 24 protons and 24 electrons. Atom "Y" has 30 neutrons, 24 protons and 22 electrons. Which comment below is true?
A) Atoms "X" and "Y" have the same mass number. B) Atoms "X" and "Y" are atoms of two different elements. C) Atoms "X" and "Y" are isotopes of the same element. D) Atoms "X" and "Y" have different atomic numbers E) Atoms "X" and "Y" both have a positive charge.

2. An atom has an atomic mass of 36 atomic mass units and an atomic number of 23. If this atom is neutral which comment below is true?
A) The atom has 23 neutrons and 13 electrons B) The atom has 23 protons and 13 neutrons C) The atom has 36 protons 13 electrons and 13 neutrons D) The atom has 13 electrons and 13 neutrons E) The atom has 43 electrons and 13 neutrons

3. The loss of electrons from a neutral atom
A) makes the atom negatively charged. B) reduces the mass number of the atom C) reduces the atomic number of the atom D) makes the atom positively charged E) significantly reduces the mass of the atom to almost a third of the original mass.

4. An atom has 13 protons and a charge of 3+. Which comment below is true?

A) The electrons are arranged as follows, 2 in the first energy level, 8 in the second energy level. B) The electrons are arranged as follows, 10 in the first energy level and 3 in the second energy level. C) The electrons are arranged as follows, 2 in the first energy level, 8 in the second energy level and 3 in the third energy level. D) The electrons are arranged as follows, 2 in the first energy level, 8 in the second energy level and 2 in the third energy level. E) The electrons are arranged as follows, 2 in the first energy level, 5 in the second energy level.

5. Which one of the following options represents a very stable, neutral atom?
A) Atom "X" has an atomic mass number of 18 and an atomic number of 9 B) Atom "Y" has 10 neutrons and 18 protons in its nucleus . C) Atom "Z" has an atomic mass number of 36 and an atomic number of 16 D) Atom "D" has 18 neutrons and an atomic mass number of 39 E) None of the above options represent a stable atom.

6. The image on the right represents a neutral atom. Which comment below is most likely to be true?
A) The atom has 3 electrons in its nucleus and 2 protons. B) The atom is made up of 5 subatomic particles. C) The atom has an atomic mass of 5 atomic mass units and an atomic number of 2. D) The atom has 2 electrons in its nucleus and 5 protons E) The atom has 2 electrons and 5 protons

7. The neutral atom represented by the image on the right is most likely to:
A) form an ion with a charge of 2+ B) have an atomic mass of 8 atomic mass units C) take electrons from another atom D) have an atomic number of 5 E) be very stable and not react with any other atom.

8. Element "X" is pictured on the right. Which comment below is true?
A) An atom of element "X" has 15 electrons and 13 protons. B) An atom of element "X" has 22 protons and 23 neutrons. C) A neutral atom of element "X" has 23 electrons. D) An atom of element "X" has 45 electrons and 23 protons. E) An atom of element "X" has 22 electrons and 23 protons.

9. An atom is neutral because it contains
A) a number of protons equal to the number of neutrons. B) a number of electrons equal to the sum of protons and neutrons. C) a number of electrons equal to the number of protons. D) a number of neutrons equal to the number of protons. E) a number of neutrons equal to the number of electrons.

10. The image on the right shows the nuclei of 4 different elements. Which one belongs to element "X"?
A) A B) B C) C D) D E) No nucleus belongs to element "X".