Copper has two stable isotopes 63cu and 65cu. 63cu has an abundance of 69.09%. the other isotope, 65cu, has an abundance of 30.91%. calculate the average atomic mass of copper.

What is the term for a solid that forms when two liquids are mixed together? A. a reactant B. an energy source C. a precipitate D. a solute

The flattest place on Earth is A the Abyssal Plain B the Sahara Desert C in Oklahoma on the Great Plains D the continental shelf

Rainwater can have a ph as low as 3, meaning that it is very a. basic b. salty c. acidic d. neutral

Question 2 Bromine will react very fast (almost instantly) with which compound? O 1-Pentene Cyclohexane Heptane Benzene

How does increasing the temperature affect a reaction? A. An increase in temperature increases the reaction rate. B. An increase in temperature slows down the reaction. O C. An increase in temperature lowers the reaction's activation energy. O D.

If a sealed syringe that contains some gas in heated in which direction will the syringe plunger move

Use the drop‑down menus to label the statements as either true of false. Dichloromethane is flammable. true false Methanol is flammable. Concentrated sulfuric acid is corrosive. 10% sodium carbonate solution must be used in the fume hood.

What is the process all rocks are continuously in during which that can change into other types of rocks

Collagen is made of fibers and is found in tendons and cartilage. Collagen contributes to meat toughness and is, therefore, an example of which type of protein?

1. Why does CH30 evaporate faster than water?