Which of the following substance is not an acid? 1. substance a is tested and found to have a ph of 3. 2. substance b, a common food, tastes sour. 3. substance c causes metals to corrode. 4. substance d feels slippery in solution.

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

What is a difference between a mixture of elements and a mixture of compounds

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.