Col Chem Review (Nov 2024)

Front

Which measurement is expressed to three significant figures?

Back

7.30 x 10^-7 km

Front

What type of change is described when a material undergoes a transformation without altering its chemical composition?

Back

Physical change

Front

Calculate the density of a cube with a mass of 64.0 g and dimensions 2.0 cm x 2.0 cm x 2.0 cm.

Back

8.0 g/cm^3

Front

Define accuracy in measurements.

Back

Measurement near the true value.

Front

What is the volume of 45.6 g of silver if the density of silver is 10.5 g/mL?

Back

4.34 mL

Front

What is the formula for density?

Back

Density = Mass/Volume

Front

How do you convert grams to milliliters for a substance with a known density?

Back

Use the formula: Volume = Mass/Density.

Front

What is the significance of significant figures in measurements?

Back

They indicate the precision of a measurement.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object; weight is the force exerted by gravity on that mass.