if a penny is 1.15 mm thick how many pennies are needed to reach the ceiling in a room where the height is 2.30 m

Two glasses labeled A and B contain equal amounts of water at different temperatures. Kim put an antacid tablet into each of the two glasses. The table shows the time taken by the tablet to dissolve completely in the two glasses.

If a nuclear medicine is found to be 1/32nd its original strength, how many half-lives have passed since the medicine was created in the laboratory?

Which term best describes a protein that speeds up chemical reactions in living things? a. structural protein b. enzyme c. amino acid d. transport protein?

The s subshell can hold up to two electrons in an atom. True or False

In organisms whose internal body temperature has dropped, which of the following responses is likely to result?

What occurs when a magnesium atom becomes a magnesium ion?

Two electrons are shared equally in bromine. what type of bond is represented between the bromine atoms in this Lewis structure

6. A gas mixture has partial pressure of 120 torr N2, 350 torr Ar, and 480 torr SF6. What is the mole fraction of sulfur hexafluoride in the mixture?

The population of rabbits in a forest is decreasing. Foxes in that region are now competing with each other for the limited number of rabbits in that forest. Which type of competition exists among these foxes?

Which statement describes the periodic table? It is a scientific model. It is a scientific experiment. It is a hypothesis. It is the scientific method.