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15
×
For the isotope 71Ga, Z = __ and A =__.
71; 40
71; 31
31; 40
31; 71
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15
×
Another name for atomic mass unit (amu) is the _______
mendeleev.
kekule.
dalton.
avogadro.
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15
×
How many calories are released when 500 g of water cools from 95.0°C to 25.0°C?
3.50 Ã 10^4 cal
4.75 Ã 10^4 cal
70.0 cal
1.25 Ã 10^4 cal
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15
×
An atom with 3 valence electrons will most likely ________
gain three electrons.
lose three electrons.
lost five electrons.
gain five electrons.
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lifesaver
Give 20 points!
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fairy
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5
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20
25
×
fairy
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15
20
25
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baam
Lose 20 points!
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15
×
What temperature is -10°C on the Fahrenheit scale?
26°F
263°F
-18°F
14°F
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15
×
Which choice best describes the degree of uncertainty in the measurement 4.0032 g?
The quantity is exact.
The measurement is between 3.99 and 4.01 g.
The measurement is between 4.0031 and 4.0033 g.
The measurement is between 4.002 and 4.004 g.
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15
×
The smallest amount of an element that retains that element's characteristics is the _____
proton.
atom.
electron.
molecule.
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boom
Lose 50 points!
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fairy
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25
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fairy
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25
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thief
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15
×
What is the formula of a compound formed by the ions M^2+ and X^3-?
M3X2
M2X
M2X3
MX3
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