NCFE Chemistry Review Set (Can't Drive 55 Set)

Front

What is the percent by mass of sodium in NaCl?

Back

39%

Front

Name the ionic compound Cr(NO2)3.

Back

chromium (III) nitrite

Front

What is the name of the compound with the chemical formula CoF3?

Back

cobalt(III) fluoride

Front

When an electron moves from n=4 to n=1, what wavelength of energy is emitted?

Back

97 nm

Front

Classify the following molecule: H2O.

Back

polar

Front

What is the formula for calculating percent by mass?

Back

(mass of solute / total mass of solution) x 100

Front

What is an ionic compound?

Back

A compound formed by the electrostatic attraction between oppositely charged ions.

Front

What is the significance of the oxidation state in naming compounds?

Back

It indicates the charge of the metal ion in the compound.

Front

What is the difference between polar and nonpolar molecules?

Back

Polar molecules have a net dipole moment due to unequal sharing of electrons, while nonpolar molecules do not.

Front

What is the formula for calculating the energy of a photon?

Back

E = h * f, where E is energy, h is Planck's constant, and f is frequency.