Unit 3 Part 1 Review

Front

What is precision in measurements?

Back

Precision is a measure of how close measurements come to each other when they are made in the same way.

Front

What is the correct dimensional analysis setup to convert grams of an element to atoms?

Back

The correct setup is option D.

Front

What is the molar mass of an element equal to?

Back

The molar mass of an element is equal to its atomic mass.

Front

How do you determine the empirical formula from the mass of elements?

Back

The empirical formula can be determined by calculating the mole ratio of the elements based on their masses.

Front

What is the molecular formula of a salt with a molecular weight of 168.36 g/mol and a percentage composition of 78.93% Cs and 21.08% Cl?

Back

The molecular formula of the salt is CsCl.

Front

Define accuracy in measurements.

Back

Accuracy refers to how close a measurement is to the true value.

Front

What is the difference between accuracy and precision?

Back

Accuracy is about closeness to the true value, while precision is about consistency among repeated measurements.

Front

What is dimensional analysis?

Back

Dimensional analysis is a mathematical technique used to convert units from one system to another.

Front

What is an empirical formula?

Back

An empirical formula represents the simplest whole-number ratio of elements in a compound.

Front

How do you calculate the percentage composition of a compound?

Back

Percentage composition is calculated by dividing the mass of each element by the total mass of the compound and multiplying by 100.