If a substance changes from one phase to another, is it still same substance? why

The ideal gas constant, R, can be found using which of the following equations? A. R = (nP) / (VT) B. R = (PV) / (nT) C. R = (nT) / (PV) D. R = (PT) / (nv) E. R = (nV) / (PT)

What are energy levels?

What is the correct order of level of organization, from smallest to largest? O organism tissue organ-organ system cell O organism organ system - organ tissue cell O cell tissue organ-organ system organism O cell organ-organ system organism - tissue

The nucleus of one boron atom has 5 protons and 4 neutrons wjat is the total number of electrons in a boron atom

Chemical formula for nickel (11) nitrite show work

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?

Describe the physical properties of water

Which element has the same number of valence electrons as oxygen--. a. Neon-b. Nitrogen-c. Sulfur-d. Fluorine

Approximately how many half-lives must pass for the amount of radioactivity in a substance to decrease to below 1% of its initial level?