True or False? Atmospheric oxygen increased after the evolution of photosynthetic prokaryotes.

Water at 110°C is a A. gas. B. liquid. C. solid

If a certain gas occupies a volume of 20 l when the applied pressure is 10 atm, find the pressure when the gas occupies a volume of 5.0 l.

1) Which of the following is the best example of a physical change? A) Sugar Dissolving in tea B) Firefly Glowing 2) In the combustion of ethane, what is/are the reactants? C2H6 + O2 = => CO2 + H2O A) C2H6 and O2 B) CO2 and C2H6

How many protons are in hydrogen

Rubidium has two naturally occurring isotopes, rubidium - 85 (atomic mass = 84.9118 amu; abundance = 72.15%) and rubidium - 87 (atomic mass = 86.9092; abundance = 27.85%). Calculate the atomic weight of rubidium

Heat is most closely related to ___ energy. A. Nuclear B. Electrical C. Thermal

How many moles are in 26.4 grams of lithium

What is the independent, dependent, control group and constant: A student wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were added before each test flight.

Where are two places that scientists obtain scientific knowledge

Which of the following best describes what happens when an ionic bond forms? A) two atoms come together and share electrons in order to fill their octets. B) two atoms give up their electrons in order to form a bond.