What changes in physical properties can be used as evidence that a chemical reaction has occured?

What experiment led to the discovery of the nucleus

What mass of ni2 + is produced in solution by passing a current of 67.0 a for a period of 14.0 h, assuming the cell is 90.0 % efficient?

What's a heterogenous mixture

Heat energy is transferred by conduction whenever molecules? A. change forms. B. spread apart. C. fuse together. D. collide.

If 0.200 g of KHP (F. W. = 204.22 g/mol) require 22.30 mL of sodium hydroxide solution in a titration what is the molar concentration of the sodium hydroxide solution?

What is the element in period 5 with 6 valence electrons?

What unit is electrical energy typically measured in on energy bills

Hydrogen is not chemically stable because

What advantage does a heterogeneous catalyst provide over a homogeneous catalyst in industrial processes? A. A heterogeneous catalyst provides a higher reaction rate. B. A heterogeneous catalyst can be easily separated from reactants. C.

A 1.0-gram piece of zinc reacts with 5 milliliters of HCl (aq). Which of these conditions of concentration and temperature would produce the greatest rate of reaction? (1) 1.0 M HCl (aq) at 20.°C (2) 1.0 M HCl (aq) at at 40.°C (3) 2.