The nurse notices that a woman in an exercise class is unable to do one-person jump rope. What does the nurse know that the shoulder must be able to do in order for one to be able to do one-person jump rope?

If experimental results contradict a hypothesis, the hypothesis must be either revised or discarded.

How much heat (kJ) is needed to raise the temperature of 100.0 grams of water from 25.0°C to ? Water has a specific heat capacity of 4.186 J/g°C

What is the charge on an ion that has an atomic number of 24 and contains 23e-?

The atom is the fundamental building block of everything we hear, feel, see, and experience.

A scientific law is a brief statement that summarizes past observations and predicts future ones.

Silicon, which makes up about 25% of Earth’s crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, 28Si, 29Si, and 30Si. Calculate the atomic mass of silicon. IsotopeIsotopic Mass (amu)Abundance % 28Si 27.976927  92.23  29Si 28.976495  4.67  30Si 29.973770  3.10 

Classify the following elements as metals, metalloids, or nonmetals.

J.J. Thomson discovered the existence of protons.

The mass of a single arsenic atom is 1.244 × 10-22 g. This is the same mass as