How much time does it take for light from the center of the galaxy to reach Earth?

Why does a metallic ion produce a characteristic color?

What mass (in grams) of iron is required to react with 7.0 L of oxygen at 1 atm and 0ºC in order to produce Fe3O4 according to the balanced equation below

When the following alcohol was subjected to dehydrating conditions, two major organic products were obtained. one or more rearrangements can occur. draw the structures of the two major products.?

A mixture is two or more substances that are mixed together but not chemically combined. The substances in a mixture each keep their own properties and can be separated from the mixture.

What are the three main radioactive elements

How many grams of methane gas (CH4) are in a 15.8-liter sample at 1.2 atmospheres and 27°C? Show all work used to solve this problem

Oxygen forms a number of compounds with sulfur, many of which are quite reactive. One such compound is 57.20 % by mass S. Calculate the number of grams of oxygen present in a sample of this compound that contains 50.00 grams of S.

What is meant by "pressure of the atmosphere?" What causes this pressure?

A substance is analyzed and found to contain 85.7% carbon and 14.3% hydrogen by weight. A gaseous sample of the substance is found to have a density of 1.87 g/L, and 1 mol of it occupies a volume of 22.4 L.

Which property of a mineral sample does not influence how quickly it settles in water? 1) density 2) hardness 3) shape 4) size