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