Give at least two ways to know if a reaction is endothermic or exothermic

In the following atomic model, where does the strong nuclear force happen? А B с -0 outside A between A and B between B and C O inside C

Which best describes what solar systems are comprised of

The burning of gasoline to power internal combustion engines produces water vapor, and carbon dioxide gas that is thought to contribute to the "Greenhouse Effect" in the earth's atmosphere.

Suppose that 0.290 mol of methane, CH4 (g), is reacted with 0.440 mol of fluorine, F2 (g), forming CF4 (g) and HF (g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released?

If an element has an atomic number of 11 and a mass number of 23, how many protons, neutrons, and electrons does it have

The ksp of lead (ii) hydroxide, pb (oh) 2, is 1.43 * 10-20. calculate the solubility of this compound in g/l.

On earth, the weight of an object changes. TrueFalse

When 5 grams of KCl are dissolved in 50. grams of water at 25°C, the resulting mixture can be described as (1) heterogeneous and unsaturated (2) heterogeneous and supersaturated (3) homogeneous and unsaturated (4) homogeneous and supersaturated

How have water & wind shaped Earth's Surface?

Convert 14 kilograms to pounds