What word means the remains or imprint of once living organisms found in layer of rock

A first order reaction has a rate constant of 0.543 at 25 c and 6.47 at 47 c. Calculate the value of the activation energy in kilojoules (enter answer to one decimal place)

How many atoms of gallium are in 2.85x103 g of gallium?

What is the final temperature of a 27.2-gram wooden block that starts at 23.4°C and loses 759 joules of energy? The specific heat capacity of wood is 1.716 joules/gram degree Celsius. Use the formula Q = mCΔT. A. 7.1°C B. 10.9°C C. 16.3°C D. 39.7°C

What is the mass in grams of 2.48/x10^25 molecules of AgNO3?

A (n) has different properties than the elements that compose it and is made of substances combined in a specific ratio.

A gas occupying a volume of 25 ft3 weighs 3.5 lbf on the moon, where the acceleration of gravity is 5.47 ft/s2. determine its weight, in lbf, and density, in lb/ft3, on mars, where g = 12.86 ft/s2.

What's the physical state of hydrogen and zinc in 2HCl+Zn=ZnCl2+H2

H2O (s) ⇒ H2O What would be the best argument against writing this in the form of a chemical equation?

What effect does an increase in products have on the reaction rate of a mixture at equilibrium?

Explain the basic principles of a distillation unit operation