Melissa uses a sunscreen with an spf rating of 20. what does this does this mean?

What are the similarities between liquids and gases?

The concentration of a chemical degrades in water according to first-order kinetics. The degradation constant is 0.2 day-1. If the initial concentration is 100.0 mg · L-1, how many days are required for the con - centration to reach 0.14 mg · L-1?

A radio station's channel, such as 100.7 FM or 92.3 FM, is actually its frequency in megahertz (MHz), where 1MHz=106Hz and 1Hz=1s-1. Calculate the broadcast wavelength of the radio station 91.10 FM.

What is the mass of one mole of S8?

Which of the following statements is true of the critical temperature of a pure substance? A. The critical temperature is the temperature above which the liquid phase of a pure substance can exist. B.

Transport means to move something from one place to another. True False

What are two reasons that ocean water sinks in the Arctic Ocean? A. The surface water is warmer and less salty than normal. B. The surface water is warmer and more salty than normal. C. The surface water is colder and less salty than normal. D.

Which statement best describes the conductivity of weak electrolytes, such as weak acids and bases? A) Weak electrolytes do not dissolve in water and can not conduct electricity.

Two speakers are placed side by side and are described as having constructive interference. How do you know when constructive interference of sound waves has occurred?

Write about "human impact"