Chemistry Semester 1 Final Review

Front

How many significant figures does the number 0.00450 have?

Back

3 significant figures.

Front

Convert 250,000 micrograms (μg) into grams (g).

Back

0.25 g.

Front

What is the best classification of matter for the air we breathe every day?

Back

Homogeneous mixture.

Front

How would you classify the substance, Au?

Back

Pure substance, element.

Front

What is the chemical name for SF6?

Back

Sulfur hexafluoride.

Front

Define significant figures in measurements.

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 the decimal portion.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the composition is uniform throughout, such as air or saltwater.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture in which the composition is not uniform, and different components can be seen, such as salad or sand.

Front

Define pure substance.

Back

A pure substance is a material that has a constant composition and consistent properties throughout, such as elements and compounds.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is a substance formed when two or more elements are chemically bonded together.