Why do some elements react easily but others dont?

What are the substances you start with in a chemical reaction called

How many moles of ammonia are in 1.20 x10 25 molecules of ammonia?

1: The atomic number of an atom is equivalent to which of the following? A. the number of protons plus the number of neutrons in the nucleus B. the number of electrons outside the nucleus C. the number of protons in the nucleus D.

If δh = - 70.0 kj and δs = - 0.500 kj/k, the reaction is spontaneous below a certain temperature. calculate that temperature. express your answer numerically in kelvins.

If an atom is reduced in a redox reaction, what most occur to another atom in the system

What is the mass of 8 moles of sodium atoms

When 50.0 g of 0.200 M NaCl at 24.1 C is added to 100.0 g M AgNO3 at 24.1 C in calorimeter, the temperature increases to 25.0 C as AgCl2 forms. Assuming the specific heat of solution and products is 4.

Explain why elements and compounds are pure substances

Which term best describes the water in a sugar-water solution?

What are the forces that create electromagnetism?