The usefulness of mendeleev's periodic table was confirmed by a. the discovery of subatomic particlesb. the immediate acceptance by other scientists c. the discovery of elements with predicted properties d. the discovery of elements in the

4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s. circle one: ke / gpe / both show your work for finding the values of each type of energy the object has:

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.

Why can water dissolve many ionic compounds