Which event always involves a chemical change?

boiling

melting

conducting

burning

Hydrogen (atomic number 1) has three isotopes: ¹H, ²H, and ³H. What is the number of protons in an atom of hydrogen with the highest mass number? (a) 2 (b) 1 (c) 0 (d) 3

An unknown atom has 26 neutrons and an approximate atomic mass of 48 amu. what is the name of this element?

What is the term for the relative order of metals arranged by their ability to undergo reaction?

The mass of a liquid is 11.50 g and its volume is 9.03 ml. how many significant figures should its desnsity value have

Which of the given statements best represent what to do in the event of a spill of concentrated sulfuric acid. a. First, rinse the affected area with copious amount of water. b. First, rinse the affected area with copious amounts of sodium hydroxide.

A fish company delivers 22 kg of salmon, 5.5 kg of crab and 3.48 kg of oysters to your seafood restaurant. What is the mass, in kilograms of the seafood? What is the total number of pounds?

If 38.7 grams of lithium chlorate decomposes, how many grams of oxygen gas can be produced?

Balance the following redox equation in acidic solution using the smallest integers possible and select the correct coefficient for the H + (aq) ion.

Toussaint L' ouveeture lead a revolt that eventually resulted in Independence for

If a solution contains 1 x 106 hb molecules, how many o2 binding sites are available? if the solution of hb is 50% saturated with o2, how many binding sites are occupied by o2?