In a periodic table, dots around an elements symbol indicate the number of valence electrons in an atom? True Or False

The chemical equation below shows the decomposition of ammonium nitrate (NH4NO3). NH4NO3 → N2O + 2H20 A chemist who is performing this reaction starts with 160.1 g of NH4NO3. The molar mass of NH4NO3 is 80.

How do scientists use seismic data to find out about the outer core of the earth

What are the five major changes in state? (science question)

1. In which of these cases do we have enough information to say that the atom is electrically neutral?

What does a graph representing Charles's law show? Volume decreases as temperature increases. Volume increases at the same rate as temperature. Volume decreases as pressure increases. Volume increases at the same rate as pressure.

Which of the following is a measure of randomness in a system? A) entropy. B) kinetic energy. C) potential energy. D) chemical energy.

What substance can be broken down by chemical means? A) ammonia B) aluminum C) antimony D) argon (Castle learning question)

How the law of conservation of mass could be useful for investigating chemical changes

A covalent chemical bond is one in which outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms.

To break a chemical bond, energy must be (1) absorbed (2) destroyed (3) produced (4) released