What methods do scientists use to determine if a change was physical or chemical?

The label of a fertilizer states that the fertilizer contains 18.1% p4o10 by mass. What is the mass percentage of phosphorus in the fertilizer?

Consider the following equilibrium reaction having gaseous reactants and products. 4HCl + O2 ⇌ 2H2O + Cl2 Which of the following would result from increasing the concentration of H2O?

Nitrogen fixing bacteria in soil turns nitrogen gas into

After Frank Palko was sentenced to death by the state of Connecticut, the Supreme Court ruled that his conviction and execution should be upheld. the case should be thrown out for lack of evidence. his sentence should be reduced.

One result of the water table reaching the surface is a lake true or false

Select the statements that best describe the properties of an intramolecular sn2 reaction mechanism.

Is a iron nail solid attracted to a magnet and soluble in water

Convert 45.8g of CO2 to mol

Suppose that 0.95 g of water condenses on a 75.0 g block of iron that is initially at 22 °c. if the heat released during condensation is used only to warm the iron block, what is the final temperature (in °c) of the iron block?

How many grams of NaOH are produced with the reaction of 5.00 moles of water?