How do atoms, compounds, and elements differ?

A mixture of NH3 and N2H4 is placed in a sealed container at 300K. The total pressure is 0.50 atm. The container is heated to 1200 K at which time both substances decompose entirely according to the equation 2NH3 - > N2 3H2, N2H4 - > N2 2H2.

Na + O2 - - > Na2O This is a balanced equation True False

What is the total number of valence electrons in an atom of boron in the ground state

The empirical formula of a compound is ch. it's molar mass is 52.07 g/mole. What is its molecular formula

How much of a radioactive parent isotope will remain after three half-lives have passed? a. one-eighth b. three-halves c. one-third d. one-sixth?

What are 3 physical properties of aluminum foil

A chemist heats a sample of hydrated lithium nitrate which weighs 170 grams and finds, after heating that it weighs 95.3 grams. What is the percent of water in the hydrate?

What is toxicity? Give an example of something from your home.

Why was it important to polish the copper strips and wire, the coin, and the nail in the electroplating experiment? You need to remove a layer of copper from the surface of each material.

Which response includes all the following that are properties of most metals, and no other properties? Z1) They tend to form cations. Z2) They have high first ionization energies. Z3) They have outer electronic shells that are more than half-filled.