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1 | |
Which of the following is a physical change? |
| | A) | milk turns sour |
| | B) | battery cables corrode |
| | C) | sugar when heated becomes brown |
| | D) | when cooled, liquid water becomes ice |
| | E) | hard-boiling an egg |
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2 | |
Which of the following properties cannot be used to distinguish between FeS and a mixture of iron and sulfur? |
| | A) | partial solubility in carbon disulfide |
| | B) | density |
| | C) | ability for the objects to be separated by a magnet |
| | D) | appearance |
| | E) | mass |
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3 | |
Which one of the following is a chemical change? |
| | A) | cutting a bar of sodium metal into pieces with a knife |
| | B) | lard when heated changes to liquid |
| | C) | a freshly cut apple turns brown |
| | D) | mixing sugar and cinnamon |
| | E) | water disappears from a beaker in a few days at room temperature |
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4 | |
How many protons and electrons are present in a Ca2+ ion? |
| | A) | 18 protons, 20 electrons |
| | B) | 20 protons, 18 electrons |
| | C) | 20 protons, 21 electrons |
| | D) | 20 protons, 19 electrons |
| | E) | 22 protons, 20 electrons |
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5 | |
Naturally occurring argon consists of three isotopes, the atoms of which occur in the following abundances: 0.34% 36Ar (35.9676 u), 0.07% 38Ar (37.9627 u), and 99.59% 40Ar (39.9624 u). The calculated atomic weight of argon is: |
| | A) | 39.95 u |
| | B) | 37.96 u |
| | C) | 38.96 u |
| | D) | 39.64 u |
| | E) | none of the above |
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6 | |
The scientist who determined the charge of the electron was ____________. |
| | A) | J.J. Thompson |
| | B) | Robert Millikan |
| | C) | Marie Curie |
| | D) | Henry Mosley |
| | E) | Martin Silberberg |
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7 | |
An atom of the isotope chlorine-39 consists of how many protons, neutrons, and electrons? (p = proton, n= neutron, e = electron) |
| | A) | 17 p, 17 n. 22 e |
| | B) | 39 p, 38 n, 39 e |
| | C) | 22 p, 17 n, 17 e |
| | D) | 17 p, 39 n, 17 e |
| | E) | 17 p, 22 n, 17 e |
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8 | |
Which of the following is NOT explained by Dalton's atomic theory? |
| | A) | The existence of more than one isotope of an element. |
| | B) | Conservation of mass in a chemical reaction. |
| | C) | Different elements have different masses. |
| | D) | The law of multiple proportions. |
| | E) | The law of definite proportions. |
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9 | |
A pure substance that cannot be changed into a simpler form of matter by any chemical reaction is: |
| | A) | a compound |
| | B) | a mixture |
| | C) | an element |
| | D) | a molecule |
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10 | |
Consider the electromagnetic spectrum. Which of the following statements is not true? |
| | A) | Some radio waves have wavelengths greater than a meter. |
| | B) | Some gamma rays have energies a million times less than some infrared radiation. |
| | C) | Some microwaves have wavelengths of about a centimeter. |
| | D) | Some g rays have energies a million times greater than some infrared radiation. |
| | E) | Some radio waves have energies a million times less than some infrared radiation. |
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11 | |
Which of the following is a physical change? |
| | A) | milk turns sour |
| | B) | battery cables corrode |
| | C) | sugar when heated becomes brown |
| | D) | when cooled, liquid water becomes ice |
| | E) | hard-boiling an egg |
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