Stage in a star's evolution formed as the core of a main sequence star uses up its helium and the outer layers escape into space

The molar mass of SO3 is grams. in significant figures

Consider each of the following molecules in turn: (a) dimethyl ether, (CH3) 2O; (b) trimethylamine, (CH3) 3N; (c) trimethylboron, (CH3) 3B; and (d) carbon dioxide (CO2). Describe the hybridization state of the central atom (i. e.

At a temperature of 273 K, a 400.-milliliter gas sample has a pressure of 760. millimeters of mercury. If the pressure is changed to 380. millimeters of mercury, at which temperature will this gas sample have a volume of 551 milliliters

What is combustion? explain its different types?

A 5.0L container is filled with H2 gas at STP. Predict what happens with the conditions of the gas change as described below (increase, decrease or stays the same).

Two pure elements react to form a compound. One element is an alkali metal, X, and the other element is a halogen, Z. Which of the following is the most valid scientific claim that can be made about the compound? a. It has the formula XZ2 b.

Are protons positive and neutrons neutral

Why might it be useful to determine the elements that a planet or moon is made up of?

Which of these is an example of a solution A Sand stirred in water B Sugar stirred in tea C A glass of water with ice in it D Oil and vinegar in a salad dressing jar

What are properties of colloid