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