Normal rainfall is slightly acidic, which means its pH must be

One example of a chemical change is

Substances that CANNOT be broken down chemically into other substances are

The density of a block of wood with a volume of 50 cubic centimeters and a mass of 100 grams is

Which of the following is NOT an example of a chemical change?

The elements in a column of the periodic table

Which group contains the most elements?

A neutral solution has a pH of

Which particles in atoms have a negative electric charge?

The nucleus of an atom has a positive charge because the nucleus contains

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