An unknown substance undergoes a chemical change that gives off heat. What can you tell me about this substance?

Nhich statement defines activation energy? O It is the sum of the maximum energy and reactant energy. It is the sum of the product energy and reactant energy. O It is the difference between reactant energy and maximum energy.

Does an object appear larger when the observer is closer or farther away from it?

What acid and base are neutralized to give potassium nitrate salt?

According to dalton, if 2 grams of element xcombine with 4 grams of element yto form compound xy, how many grams of element xwould combine with 28 grams of element yto form the same compound?

How many atoms are in 131.97 liters of water vapor at STP? A) 6.023 * 1023 B) 3.54846 * 1024 C) 3.548 * 1024 D) 1.0645 * 1025

Determine the relative formula mass of glucose (C6H12O6) using the periodic table below. A. 29.1 g/mol B. 24.0 g/mol C. 15.0 g/mol D. 180.1 g/mol

How many moles of potassium chloride are in 28 grams of KCl? A.).265 mole KCl B.).856 mole KCl C.).376 mole of KCl (think it's this but idk) D.) 1.2 mole KCl

An unknown liquid has a pH lower than 7, conducts electricity poorly, and tastes sour, what kind of solution is the unknown?

Five beans have a mass of 2.1 g. How many beans are in 0.454 kg of beans.

As the temperature of a liquid goes up, the average speed of its particles. This means that the kinetic energy of the particles