How old is the idea that matter is composed of atoms?

Salt is added to water. You speed up dissolving by stirring the salt into the water. Then your teacher challenges you to separate the salt from the water.

Standard Heat of Formation: The enthalpy change for the formation of 1 mol of a substance in its standard state from its constituent elements in their standard states. True / false?

Aluminum has a specific heat of 0.902 j/gC. How much heat is lost when a piece of aluminum with a mass of 23.984 g cools from a temperature of 415 degrees to 22 degrees?

A textbook is 26 cm long, 25 cm wide, and 5.2 cm thick What is the volume in cubic centimeters

Which statement correctly relates two substances in this chemical equation? NH3 + H2O ⇌ OH - + NH4 + A. H2O is the conjugate base of OH-. B. H2O is the conjugate acid of NH3. C. NH4 + is the conjugate acid of NH3. D.

How many grams of KCl are produced when 60 grams of K are reacted?

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How do compounds affect an atom's stability

You need to make 10 mL of 2 mg/ml solution of protein and you have 25 mg/mL solution. How much protein solution and water do you need to mix in order to make the required solution?

The definition of volume is? a) width*height b) the space occupied by mass c) the space occupied by a liquid d) the mass of liquid required to fill a container