In what region of a star does an absorption spectrum originate?

What initial temperature of the copper metal which equal to the temperature of the coffee? Mass of metal = 29.8801 g T i = 18.2 degree Celsius T f = 20.1 degree Celsius Specific heat 0.384 J/g degree Celsius

Why is coal not a mineral? It does not have a regular composition. It does not occur naturally. It is organic. It is not a solid.

Sodium carbonate (Na2CO3) and potassium carbonate (K2CO3) react with water to form an alkaline solution that has detergent properties. These compounds are present in:

what are we/what has someone did to prevent/lessen the negative side effects of aluminium extraction?

In some vintage science fiction movies, space travelers find themselves on a planet orbiting a distant star in which there are curious forms of life based on silicon instead of carbon.

In Flask A, you reacted 7.23 g Mg with 1.05 mol HCl. In Flask B, you reacted 1.22 g Mg with 1.35 mol HCl. Which balloon will inflate the most?

I have 2 electrons is the first shell, 8 in the second, and 6 in the third

The production of plastics makes life, so it benefits society. On the other hand, the production of plastics causes air and water, so it also harms society.

The total number of moles represented by 20 grams of CaCO3 is

Particles of matter how have both potential and kinetic energy is that true or false?