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- 1. Multiple Choice
What is the charge of an iron atom with 24 electrons?
-2
+2
-24
+24
- 2. Multiple Choice
The charge of the nucleus of an atom is due to the presence of
negative protons and positive electrons
negative neutrons
positive protons
positive protons and negative neutrons
- 3. Multiple Choice
The half-life of uranium-238 is 4.5 billion years. The half-life of potassium-40 is 1.25 billion years. A rock is found with half of its original potassium-40 content. How much of its original uranium-238 content remains in the rock?
between 25% and 50%
less than 12.5%
between 12.5% and 24.9%
more than 50%
- 4. Multiple Choice
The half-life of potassium-40 is approximately 1.25 billion years. An igneous rock is found to contain about one-quarter of its original mass of potassium-40. What is the approximate age of the rock?
2.5 billion years
1.25 billion years
5.0 billion years
0.625 billion years
- 5. Multiple Choice
A neutral atom of a certain element has the electron configuration 1s^2, 2s^2, 2p^6, 3s^2, 3p^4. How many valence electrons does the atom have?
11
6
16
4
- 6. Multiple Choice
What is the correct name for the compound whose formula is Na2SO4?
sodium sulfite
sodium sulfoxide
sodium sulfate
disodium sulfate
- 7. Multiple Choice
Why do blacksmiths place metal into a fire before pounding it into shape to form horseshoes?
The heat increases electron activity, which increases the malleability of the metal.
The heat creates a more consistently blended metal alloy.
The fire makes it easier to stretch metal before bending it into the shape of a horseshoe.
The fire combines the metallic atoms into a strong lattice structure.
- 8. Multiple Choice
What is the IUPAC name for the compound HNO2?
pernitric acid
nitrous acid
hydrogen nitride
hydrogen nitrate
- 9. Multiple Choice
Physicists have described four basic forces in the universe. Which one of the four basic forces holds the protons together within the nucleus of the oxygen atom in a water molecule?
electromagnetic force
gravitational force
strong force
weak force
- 10. Multiple Choice
The formation of an ionic bond involves the
sharing of protons.
transfer of neutrons.
sharing of neutrons.
transfer of electrons.
- 11. Multiple Choice
On the periodic table, why are all noble gases placed in column 18 (8A)?
Noble gases are all rarer than elements in other columns.
The noble gases only chemically react with other noble gases.
The valence electron configuration is similar in all noble gas elements.
Noble gas elements have identical molar masses.
- 12. Multiple Choice
Which group on the periodic table contains elements that are the LEAST reactive?
group 18 (8A)
group 16 (6A)
group 3 (3B)
group 1 (1A)
- 13. Multiple Choice
What has to occur before an atom in its ground state can emit a photon?
relaxation of an electron to a lower energy state
ionization of an electron from the atom
reversal of the spin of an electron
excitation of an electron to a higher energy state
- 14. Multiple Choice
Which action illustrates a chemical change?
cutting down a tree
burning wood chips
painting a wood chest
sawing a wood plank
- 15. Multiple Choice
Which of these describes a chemical property?
the hardness of the substance
the color of the substance
how the substance behaves in the presence of a magnet
how the substance behaves in the presence of an acid
- 16. Multiple Choice
As Nicholas observes the flame of a candle, he sees wax near the flame change from solid to liquid. What happens first to cause this solid to liquid phase change?
Heat from the flame breaks bonds in the wax molecules.
Heat from the flame increases the kinetic energy of wax molecules.
Heat from the flame increases the potential energy of wax molecules.
Heat from the flame fuses wax atoms into molecules.
- 17. Multiple Choice
Endothermic reactions are reactions that require more energy to start than they give off in the products. Which statement describes an endothermic reaction?
It absorbs heat energy and is cold to the touch.
It gives off heat energy and is hot to the touch.
It gives off water and is wet to the touch.
It gives off light energy and produces visible light.
- 18. Multiple Choice
After Jimmy placed raw potato slices and hydrogen peroxide in a plastic bag, he concluded that an exothermic reaction had taken place. Which of the following supports Jimmy’s conclusion?
The hydrogen peroxide (H2O2) bubbled.
The plastic bag got warmer.
The plastic bag got cooler.
The potatoes changed color.
- 19. Multiple Choice
A sample of metal has a mass of 5.2 g and absorbs 20.0 J of energy as it is heated from 30.0°C to 40.0°C. What is the identity of the metal?
iron
gold
copper
magnesium
- 20. Multiple Choice
Which statement describes equilibrium between liquid water and water vapor?
The rate of vaporization equals the rate of condensation.
The rate of vaporization is greater than the rate of sublimation.
The rate of vaporization is greater than the rate of condensation.
The rate of vaporization equals the rate of sublimation.
- 21. Multiple Choice
The chemical reaction between the reagents luminol and bleach produces a brief flash of light. Which change would most likely make the light produced in the reaction last longer?
decreasing the quantity of both reagents
adding a catalyst
increasing the luminol concentration
decreasing the temperature
- 22. Multiple Choice
Which of these has the greatest effect on the dissolving of a solid solute in a liquid solvent?
increased agitation
more solvent than solute
increased temperature
less pressure
- 23. Multiple Choice
A chewable calcium carbonate tablet is a common treatment for stomach discomfort. Calcium carbonate is most likely used as this type of medicine because calcium carbonate
occurs naturally in the body.
neutralizes digestive acid.
has a pleasant flavor.
is inexpensive to produce.
- 24. Multiple Choice
A solution is classified as a weak base. Which of these could be the pH of the solution?
2
13
10
6
- 25. Multiple Choice
A researcher measures the temperature of a hot gas. This observation is used to determine which property of the gas molecules?
average kinetic energy
elastic potential energy
movement of thermal energy
transformation of chemical energy
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