Explain what states are changing in these examples

(A) Condensation:

(B) Evaporation:

Describe one way in which uranium is disposed of.

Trevor watches as a freight train passes. He counts eight identical black railroad cars, then a red car, followed by several more black cars.

A 3.00 g sample of unknown hydrocarbon is prepared for combustion analysis. after the hydrocarbon undergoes complete combustion, 8.80 g of co2 and 5.40 g of h2o are produced. what is the empirical formula of the unknown?

1. Is O2 a compound? Explain. 2. Is O2 a molecule? Explain. 3. State the law of conservation of matter, and give an example demonstrating its meaning. 4. Electrolysis is used to break liquid water into hydrogen and oxygen gas.

What are products in a chemical reaction?

Halocarbons contain carbon, hydrogen, and atoms from which set of elements? 1. lithium, sodium, and potassium 2. nitrogen, oxygen, phosphorus, and sulfur 3. nitrogen, oxygen, and fluorine 4. fluorine, chlorine, bromine, and iodine

List at least 3 factors that can influence a body's temperature after death.

How many grams of water form when 1.24 l of gas h2 at stp completely reacts with o2?

According to the following reaction, how many grams of hydrogen peroxide ( H 2 O 2 ) are necessary to form 0.182 moles oxygen gas? hydrogen peroxide ( H 2 O 2 ) (aq) → water (l) + oxygen (g)

Using the bohr model describe the changes in electrons energy and electron location when an atom changes from the ground state to an excited state.