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11 Cards in this Set
- Front
- Back
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The mass of an object is... |
a measure of the amount of matter in the object |
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Which of the following represents a physical change in matter...? |
A substance solidifies at 443 K |
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Two pure substances A and B react to form a new pure substance C. From this, we may conclude that...? |
C is a compound, A and B may or may not be elements |
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Which is an SI unit? |
meter |
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The prefix centi- denotes what fraction of a basic unit? |
1/100 |
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Which pairs are about equal in mass? |
proton and neutron |
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Atoms are neutral. How can they have no charge? |
Equal numbers of protons and electrons |
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Isotopes differ from each other in what way? |
They have different numbers of neutrons in the nucleus |
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Avogadro's number of iron (Fe) atoms would weigh... |
55.9 g |
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Atoms that have the same atomic number but differ by mass number are called? |
Isotopes |
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If calcium carbonate found in limestone is 40.0% calcium, how many grams of calcium are in 485 g of calcium carbonate? |
(40.0)(485)/100 = 194 g of calcium |
