Which is an endothermic process?

the process in which a substance loses heat energy

the process in which a substance loses kinetic energy

the process in which the molecular motion of a substance decreases

the process in which a substance gains energy

This man is using a block and tackle to lift a heavy bale of cotton. the block and tackle contains which simple machine?

Find the mass of one mole of FeSO4. Show your addition and multiplication

An orange emission line is observed at 656.3 nm in the hydrogen emission spectrum. Determine the initial energy level of the electron.

If 4.00 g of NaCl react with 10.00 g of AgNO3, what is the excess reactant?

What does it mean that valence electrons in a metal are delocalized? a. The valence electrons move between atoms in shared orbitals. b. The valence electrons move from outer orbitals to inner orbitals of each atom. c.

Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.

What volume of 2.00 m must be added to 150.0 ml of 1.00 m chloroacetic acid to produce a buffer solution having a ph of 3.30?

Which microscope came out first

Which exerts greater pressure on the floor-standing flat-footed or standing on tiptoe? on tiptoe, because the force acts over less area on tiptoe, because the force acts over more area flat-footed, because the force acts over more area flat-footed,

1. Sara tells Michael she is 160 centimeters tall, while Michael says he is 60 inches tall. If there are 2.54 centimeters in an inch, who is taller