How are chemical and physical changes alike?

What is the difference between the number of electrons in an atom of selenium?

A gas has a mass of 3.82 g and occupies a volume of 0.854 L. The temperature in the laboratory is 302 K, and the air pressure is 1.04 atm. Calculate the molar mass of the gas.

Which of these makes it easier for scientists to understand measurement data A. having a universal language B. having a standard system of measurements C. having multiple languages D. having multiple systems of measurement

An insoluble solid that forms a chemical reaction is called an?

A part of the periodic table is shown below: A portion of the sixteenth and seventeenth columns of the periodic table is shown. Column 16 reads eight oxygen, 16 sulfur, and 34 selenium. Column 17 reads nine fluorine, 17 chlorine, and 35 bromine.

C2H6 (g) + O2 (g) → CO2 (g) + H2O (g) (not balanced) Determine the number of liters of CO2 formed at STP when 240.0 grams of C2H6 is burned in excess oxygen gas?

What type of change is baking a cake? Why?

The van der Waals forces of attraction between molecules always become stronger as molecular size 1) decreases, and the distance between the molecules increases 2)) increases, and the distance between the molecules decreases 3) decreases, and the

Which civilization formed a confederation thay may have impacted the us government A. Powhatan B. Algonquian C. Iroquois D. Anasazi

Jasmine breathed against the window pane and noticed that her breath made a spot on it from the water vapor in her breath. Which stage of the water cycle does this show? A. precipitation B. evaporation C. condensation D. transpiration