Did you observe any evidence that atoms are destroyed as a substance burns when mixing hydrogen (H2) and oxygen (O2)? Explain your answer using observations from the Sim.

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

Use the periodic table to find the molar mass of each element. molar mass h = g/mol molar mass s = g/mol molar mass o = g/mol

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?