Chem Midterm Review

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 convert a number to scientific notation?

Back

Move the decimal point in the number until only one non-zero digit remains to the left of the decimal point, then multiply by 10 raised to the number of places the decimal was moved.

Front

What is the standard form of 8.317 x 10^6?

Back

8,317,000

Front

Convert 0.00000707 to scientific notation.

Back

7.07 x 10^-6

Front

Which is smaller: 1.3 x 10^20 or 8.4 x 10^19?

Back

8.4 x 10^19 is smaller.

Front

What is a mixture?

Back

A combination of two or more substances that can be separated by physical means.

Front

What is a pure substance?

Back

A material that has a constant composition and consistent properties throughout.

Front

How many inches are in a mile?

Back

There are 63,360 inches in a mile (12 inches in a foot and 5280 feet in a mile).

Front

If each stride is 22 inches, how many strides are in 0.25 miles?

Back

720 strides.

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 made up of two or more elements chemically combined.