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