Released Test Items
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Several centuries ago, men called alchemists tried to transform common metals into gold. Even though they tried many different chemical and physical methods, they never succeeded because... | Elements cannot be changed to other elements by physical or chemical means.
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| Which of the following molecules does not contain three atoms? | N2
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| A substance made up of two or more elements that have been chemically combined is called... | A compound
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| A solution may be prepared by dissolving crystals of a salt in water. Which of the following would probably not affect the rate of solubility? | Reducing the air pressure on the solution.
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| A compound is a molecule made up of atoms from at least two elements. Which of the following gases is a compound? | Methane (CH4)
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| A proton has which of the following charges? | Positive
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| Which of the following materials is composed of only one kind of atom? | Helium
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| Which picture illustrates the structure of a molecule of water? | H
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| Mercury is a liquid metal that is used in many thermometers. The mercury in the thermometer rises because it... | Expands when heated.
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| Which of these best shows that calcium is different from all other elements? | Its number of protons.
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| In a experiment combining vinegar and baking soda, gas is given off. In this chemical reaction, the vinegar and baking soda are... | Reactants.
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| Which of these cannot be separated into its parts by an ordinary chemical or physical process? | An atom of carbon (C)
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| The atom is composed of electrons, protons, and neutrons. What is the electric charge on the neutron? | 0
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| Compounds are made up of more than one element. Which of the following represents a compound? | NH3
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| Calcium metal (Ca) can be produced by passing an electric current through molten calcium chloride (Ca12). Chlorine gas (C12) is also formed. What is the balanced equation for this reaction? | CaCl2->__Ca+Cl2
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| Which of these belongs in the outermost shell (energy level) of an atom? | Electrons.
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| When plants perform photosynthesis, they use sunlight to produce food. This is an example of light energy being converted to... | Chemical Energy.
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