Chem 1 fall final review

Front

What is precision in data measurement?

Back

Precision refers to how close a set of data points are to each other, regardless of whether they are close to the actual or accepted value.

Front

What is accuracy in measurement?

Back

Accuracy describes how close a measurement is to the accepted or true value.

Front

What does a bullseye with data points clustered together but far from the center represent?

Back

It represents low accuracy and high precision.

Front

What is the conversion factor for moles to particles?

Back

1 mol = 6.02 x 10^23 particles.

Front

How many moles are in 78 atoms of sodium (Na)?

Back

To find moles, use the conversion factor: 78 atoms x (1 mol / 6.02 x 10^23 particles).

Front

What is the balanced equation for the reaction of PCl5 with H2O?

Back

PCl5 + 4 H2O → 5 HCl + H3PO4.

Front

Define significant figures.

Back

Significant figures are the digits in a number that contribute to its precision, including all non-zero digits, zeros between significant digits, and trailing zeros in a decimal.

Front

What is the difference between accuracy and precision?

Back

Accuracy refers to how close a measurement is to the true value, while precision refers to how consistent measurements are with each other.

Front

What is a mole in chemistry?

Back

A mole is a unit that measures the amount of substance, defined as containing exactly 6.02 x 10^23 particles.

Front

What is the purpose of a conversion factor?

Back

A conversion factor is used to convert a quantity from one unit to another, ensuring accurate calculations.