Chem Test Review #2

J.J. Thomson is credited with the discovery of the first subatomic particle, the electron. To make his discovery, Thomson conducted several experiments with cathode ray tubes and analyzed the bright beam that went across the tube. Which of the following is not an accurate conclusion that Thomson drew from his experiment?

• The beam was made of particles because it was bent by a simple magnet.

• The beam was negatively charged since it was attracted to a positive charged.

• The beam was much smaller than hydrogen based on the mass to charge ratio.

• The beam was emitted from the nucleus of atoms because light was given off.

Neils Bohr was a great contributor to our understanding of the atomic model. Which of the following conclusions that was drawn by Bohr remains in our current model of the atom?

• Electrons circle the nucleus of the atom in fixed orbits.

• Electrons are contained within different energy levels in the atom.

• The nucleus contains both protons and neutrons.

• Electrons are negatively charged particles which are much smaller than protons.

A scientist examines a sample of an unknown metal. She isolates several atoms which contain 29 protons and 35 neutrons. Which of the following isotopes has she isolated?

• Copper-64

• Gadolinium-35

• Bromine-29

• Chlorine-35

How many neutrons would be found in the nucleus of the isotope chlorine-37?

• 37

• 20

• 17

• 35.5

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The picture shows a model of the isotope —

• beryllium-13

• boron-9

• beryllium-9

• boron-8

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C-12 and C-13 are naturally-occurring isotopes of the element carbon. C-12 occurs 98.89% of the time and C-13 occurs 1.108% of the time. What calculation should be used to determine the atomic mass of this element?

• (12 × 0.01108) + (13 × 0.9889) / 2

• (12 × 0.9889) - (13 × 0.01108)

• (12 × 0.9889) + (13 × 0.01108)

• (12 × 0.9889)

Refer to the diagram of Rutherford's experiment. Which of these conclusions can be drawn from Rutherford’s experiment?

• Each atom contains electrons.

• The nucleus of an atom can be split.

• Each atom contains protons.

• Atoms are mostly empty space.

According to the periodic table, which of these elements will form an ion with a -2 charge?

• oxygen

• sodium

• calcium

• chlorine

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The elements shown above referred to as the iron triad. What unique physical property is shared by the elements of this triad?

• They are only form covalent compounds with other metals

• They all have densities lower than water allowing them to float

• They all exist in the gaseous phase at room temperature

• The ability to be formed into permanent magnets

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According to the periodic table, which of these elements will form an ion with a +1 charge?

• S

• Mg

• Br

• Li

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