Pre-AP CHEM Unit 1 MC Exam Practice Days 1-2

Front

What is scientific notation?

Back

A way of expressing numbers that are too large or too small to be conveniently written in decimal form, using powers of ten.

Front

How do you determine the number of significant figures in a measurement?

Back

Count all non-zero digits, any zeros between significant digits, and trailing zeros only if there is a decimal point.

Front

What is the significance of significant figures in calculations?

Back

They indicate the precision of a measurement and ensure that calculations reflect the certainty of the data.

Front

Convert 0.073 gallons to milliliters using the conversion factors: 4 quarts = 1 gallon, 1.057 quarts = 1 liter, 1×10−3 liters = 1 milliliter.

Back

2.8 × 10² mL.

Front

How many grams are in 2.09 pounds of tomatoes? (1 lb = 453.6 g)

Back

948 g.

Front

What is the most precise lab equipment for measuring liquid volume?

Back

Buret.

Front

What is the formula for converting pounds to grams?

Back

grams = pounds × 453.6.

Front

What is the purpose of a graduated cylinder in a lab?

Back

To measure the volume of liquids accurately.

Front

Explain the concept of dimensional analysis in unit conversion.

Back

A method that uses conversion factors to change one unit of measurement to another.

Front

What is the difference between accuracy and precision in measurements?

Back

Accuracy refers to how close a measurement is to the true value, while precision refers to the consistency of repeated measurements.