Which is a sign of chemical change?

A. chocolate syrup dissolve in milk

B. folding paper changes the size

C. toast smells different than bread

Picking up sediment and moving it to another area is called a. abrasion c. deflation b. deposits d. sand blasting

When studying the movement of heat, what does the term "system" refer to? What does "surroundings" refer to?

A molecule is the smallest part of A. An element B. A compound C. Asubstance D. An atom

How many molecules are in 0.500 mole of N2O5

The solid-state transition of Sn (gray) to Sn (white) is in equilibrium at 18.0 ˚C and 1.00 atm, with an entropy change of 8.8 J K-1 mol-1. The density of gray tin is 5.75 g cm-3; that of white tin is 7.28 g cm-3.

What mass of potassium chlorate would contain 40grams of oxygen?

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) zero.

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second? (Note that the half life of Uranium-238 is 4.468x109 years)

A base can neutralize an acid. true or false

Hydrochloric acid (12.0 ml of 0.233 m) is added to 296.0 ml of 0.0579 m ba (oh) 2 solution. what is the concentration of the excess h + or oh - ions left in this solution?