What is the secondmost abundant element in the universe?

a. h

b. c

c. fe

d. he

What's the difference between mechanical energy and thermal energy?

This question is very hard and I'm having trouble with it

Which way will the equilibrium shift if you ... cool it to a low temperature?

Summarize why a scientist measuring the diameter of an atom or the distance to the moon would use scientific notation

2. How many grams of sodium fluoride (NaF) are needed to prepare a 0.400m NaF solution that contains 750 g water? (molar mass of NaF - 42.0 g/mol) 20% A 18.9 g NaF OB 9.12 g NaF c 12.6 g Naf OD 28.0 g Naf

Why is water (H2O) considered the "universal solvent"?

Which notations represent hydrogen isotopes?

Which of the following statements is true? Question 5 options: Chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not.

2 human activities that contribute to runoff into water systems

Which of the following is an example of geographic isolation? A. a population of salmon dies out because they cannot find food. B. a zebra with a long mane moves into a population of zebras with short manes. C.