Phy Sci Review #4 2024

Front

What is the classification of a solution with more solute than it can dissolve at a given temperature?

Back

Supersaturated solution.

Front

How many total atoms are in a molecule of KCl?

Back

2 (1 potassium atom and 1 chlorine atom).

Front

What is the coefficient for NaI in the balanced equation 2Na + I2 -> 2NaI?

Back

2.

Front

What is the half-life of a substance?

Back

The time required for half of the substance to decay.

Front

If a 100-gram sample of cerium-143 has a half-life of 33 hours, how much will remain after 132 hours?

Back

6.25 grams.

Front

What is an isotope?

Back

Atoms of the same element with different numbers of neutrons.

Front

Which isotope of carbon has 6 protons and 7 neutrons?

Back

Carbon-14.

Front

What is the formula for calculating the number of remaining atoms after a certain number of half-lives?

Back

Remaining amount = Initial amount × (1/2)^(number of half-lives).

Front

What is the definition of a saturated solution?

Back

A solution that contains the maximum amount of solute that can dissolve at a given temperature.

Front

What happens to a supersaturated solution when disturbed?

Back

It can crystallize and revert to a saturated solution.