Chemistry Reference
In-Depth Information
11. [D. C
6
H
12
O
6(aq)
]—A mixture requires two substances. The symbol (aq) tells
us that this sugar is dissolved in water, making a solution, which is a
homogeneous mixture.
12. [B. carbon dioxide]—Elements cannot be broken down by a chemical
change, but compounds can.
13. [A. gas to liquid]—You need to add energy (heat) to get a solid to turn to a
liquid (melting) or a liquid to turn to a gas (boiling), but energy is released
when a gas turns to a liquid (condensation).
14. [B. bronze]—You won't find bronze on the periodic table, because it is an
alloy, not an element.
15. [B. iodine]—Iodine is, indeed, one of the seven diatomic elements.
16. [B. He]—Compounds will always show two or more capital letters in their
formulas.
17. [A. copper]—Copper has the ability to be hammered into sheets, meaning
it is malleable.
18. [D. NO]—Notice that NO is the only formula shown that has two or more
capital letters.
19. [B. table salt]—Table salt contains the elements sodium and chlorine and is
represented by the formula NaCl.
20. [D. reactivity to acid]—Reactivity to acid would only be observable in a
chemical reaction.
21. [A. volume]—The volume of an object is a measure of how much space it
occupies. This will surely change if the size of the sample changes.
22. [B. rusting iron]—When iron rusts, it loses its original properties and takes
on the properties of the new compound, Fe
2
O
3
.
23. [C. sublimation of carbon dioxide]—Sublimation is a change of state
operation, which is a type of physical change.
24. [Mixtures consist of two or more substances physically combined, whereas
compounds consist of two or more substances chemically combined.]
25. [Energy isn't created or destroyed; it only changes form.]
