What unit is used to measure frequency?

a propane torch is lit inside of a hot air balloon during preflight preparations to inflate the balloon. Which condition of the gas remains? Volume, temperature or pressure?

Which of the following is an ionic compound h2o brcl mgf2 c2h4 or NH3

How could wind reshape a rock?

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 is a cause of physical weathering but not of chemical weathering? A. Air B. Wind C. Acids D. Water

A base a. causes phenolphthalein indicator to change from colorless to pink. b. donates a proton in a proton transfer reaction. c. accepts electrons in an electron transfer reaction. d. produces hydrogen ions in solution. e. does none of the above.

Which of these is an indicator that a chemical reaction has occurred? precipitate forms temperature remains the same color is diluted mass increases

The half-life of isotope X is 3 days, how long will it take for one half of 10g sample to decay

A 69.1-g sample of h2o contains how many molecules of water?

Why is ac used instead of dc