Which of the following is NOT an example of a pure substance?
A. an element on the periodic table
B. a compound made up of chemically-bonded
elements
C. a glass of salt water

Why do lunar and solar eclipse not happen every month

How many grams of sodium chloride are in 250ml of a 2.5m naci solution

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.