Term
| True or False: Chemistry is a science that deals with the composition of matter and the changes in the composition of matter. |
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Term
| True or False: A theory can never be proven correct, but one experiment can prove it incorrect. |
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Definition
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| True or False: One may test a hypothesis by making measurements, noting color changes, or weighing the amount of a substance that forms in a reaction. |
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Which of the following is a scientific observation?
1. Water freezes at 0°C.
2. If a substance freezes at 0°C, it must be water.
3. When a substance freezes, its molecules lose potential energy.
4. Freezing and boiling are called physical changes. |
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Definition
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Which of the following is a definition of matter.
1 Anything that takes up space.
2 Anything with mass.
3 Stuff
4 all of the above
5 none of the above |
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Definition
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Term
| True or False: A liquid has definite volume but no definite shape. |
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Definition
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Term
| True or False: Of the three states of matter, a gas has its particles farthest apart. |
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Term
Which of the following is not true of particles.
1 They are in constant motion.
2 Energy does not affect their motion.
3 They move in straight lines until they collide.
4 When they collide they bounce off.
5 They can vibrate, rotate or translate. |
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Definition
| 2. Energy does not affect their motion. |
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Term
Why does a solid have a definite shape while a liquid does not?
1 In a solid the particles are free to move while in a liquid they are not.
2 In a liquid, the particles are free to move while in a solid they are not.
3 In a liquid the particles do not interact with each other.
4 In a solid the particles have no space between them. |
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Definition
| 2 In a liquid, the particles are free to move while in a solid they are not. |
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Term
| Is air a element, compound, or mixture? |
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Definition
| Mixture: Air is a mixture of nitrogen, oxygen, and other gases. |
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Term
| Is oxygen an element, compound, or mixture? |
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Definition
| Element, Oxygen gas is a pure substance. |
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Term
| Is sodium choride an element, compound, or mixture? |
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Definition
| Compound: Sodium chloride is a pure substance. |
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Term
| Is wine an element, compound, or mixture? |
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Definition
| Mixture: Wine is a mixture of water, alcohol, and other substances. |
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Term
| True or False: The two forms of pure substances are elements and compounds. |
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Definition
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Term
| True or False: A solution is a homogeneous mixture. |
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Definition
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Term
| True or False: Elements are the basic building blocks of all substances. |
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Definition
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Term
| True or False: The symbols for most of the elements contain one or two letters. |
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Definition
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Term
| True or False: The symbol for cobalt can be written as Co or CO. |
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Definition
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Term
Which of the following is an element?
1 blood
2 iron
3 water
4 wood |
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Definition
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Term
| True or False: Compounds can be decomposed chemically into simpler substances. |
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Definition
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Term
| True or False: A compound is a pure substance and cannot be separated by physical means. |
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Definition
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Term
| True or False: A mixture is a combination of two or more substances in which the substances retain their identity. |
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Definition
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Term
Which of the following is not true of a gas?
1 A gas is able to be compressed into a very small volume.
2 The particles of a gas are held together by very strong attractive forces but not in a rigid form.
3 A gas presses continuously and in all directions on the vessel walls.
4 Gas particles fill the entire space in which they are contained. |
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Definition
| 2 The particles of a gas are held together by very strong attractive forces but not in a rigid form. |
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Term
Air is classified as a mixture because it
1 does not have a definite composition.
2 has a density of 1.29 g/mL.
3 is colorless and odorless.
4 may be liquefied. |
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Definition
| 1 does not have a definite composition. |
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Term
When a pure substance was analyzed, it was found to contain carbon and chlorine. This substance must be classified as
1 A compound
2 Both a mixture and a compound
3 An element
4 A mixture |
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Definition
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Term
Which of the following is an example of a chemical change?
1 A heated candle turns to a liquid.
2 A sheet of copper is easy to bend and fold.
3 A mixture of baking soda and vinegar fizzes vigorously.
4 Ice changes into water. |
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Definition
| 3 A mixture of baking soda and vinegar fizzes vigorously. |
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Term
| When a platinum wire is heated in a bunsen burner flame, the platinum gets red hot, but returns to its original appearance on cooling. Has the platinum wire undergone physical change, chemical change, or both when heated? |
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Definition
| Physical change only: The wire has undergone physical change on heating. There is no chemical change observed, as the wire appears the same after heating as before. |
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Term
| True or False: The transformation of energy from one form to another is contrary to the law of conservation of energy. |
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Definition
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Term
| True or False: The vaporization of liquid water is a chemical change. |
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Definition
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Term
| True or False: In a chemical change there is a change in the composition of matter. |
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Definition
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Term
| True or False: In a chemical change the mass of the reactants equals the mass of the products. |
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Definition
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Term
| True or False: When copper reacts with oxygen to form copper(II) oxide, a chemical change occurs. |
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Definition
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Term
| Color, taste, odor, density, and boiling point are all physical properties. |
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Definition
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Term
| True or False: An unknown compound is heated; a dark purple vapor and white crystalline solid result. This is an example of a chemical change. |
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Definition
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Term
| True or False: In a chemical change, substances are formed that are entirely different, having different properties and composition from the original material. |
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Definition
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Term
According to the Law of Conservation of Energy, energy
1 can be destroyed.
2 can be created and destroyed.
3 can be converted from one form to another.
4 can be created. |
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Definition
| 3 can be converted from one form to another. |
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Term
| True or False: The Law of Conservation of Mass states that no detectable change is observed in the total mass of the substances involved in a chemical change. |
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Definition
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Term
| True or False: Energy is the capacity of matter to do work. |
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Definition
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When 3.06g of aluminum is burned in air, the resulting product, aluminum oxide, has a mass of 5.78g. What mass of oxygen was reacted with the aluminum?
a) 8.84g
b) 5.78g
c) 1.89g
d) 2.72g |
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Definition
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Which of the following statements is true for the law of conservation of matter and energy.
1 Matter and energy can be interconverted.
2 All matter always comes from preexisting matter.
3 Energy cannot be created.
4 It only applies to nuclear reactions. |
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Definition
| 1 Matter and energy can be interconverted |
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