All BUT one describes an effect of aging on the respiratory system. A) diminished lung volume capacity B) increased respiratory mucus production C) decreases in respiratory muscle strength D) oxygen content of arterial blood decreases

Explain why or why not the change is a chemical change or not. A. The outside of a piece of cheese has turned green from mold. B. An antacid tablet dissolves in water and forms carbon dioxide. C. Ice melts and forms a puddle of water. D.

F my pH indicator turns blue when I add a substance to it, what type of substance do I have?

When a chemist collects hydrogen gas over water, she ends up with a mixture of hydrogen and water vapor in her collecting bottle. If the pressure in the collecting bottle is 97.1 kilopascals and the vapor pressure of the water is 3.

Energy decreases along a food chain in an ecosystem. How is this explained by the law of conversation of energy?

0.25 mol of nitric acid is used to make a 0.10 M nitric acid solution. What is the total volume of nitric acid in liters

Which of the answer choices best describes how electrons move, according to modern atomic theory? They vibrate in place. They move like planets. They move in orbitals. They slide past each other.

The total solute concentration of a red blood cell is about 2%. Sucrose cannot pass through a red blood cell's plasma membrane, but water and urea can. Which of the following solutions will cause a red blood cell to shrink? a.

A geologist discovered fossils of marine animals in a layer of sedimentary rock in the desert. Based on this discovery, what conclusion can the geologist draw?

How do metals form chemical bonds with other metals?

Maple syrup has a density of 1.325 g/ml, and 100.00 g of maple syrup contains 67 mg of calcium in the form of ca2 + ions. what is the molarity of calcium in maple syrup?