When substances go through chemical changes, which of the following will always happen?

Cesium-137 and Strontium-90 are both produced in nuclear fallout. Cesium-137 has a half-life of 30 years. Strontium-90 has a half-life of 28 years. Strontium-90 is considered to be a greater health threat because cesium-137 has a longer half-life. a.

Electronegativity difference of N and H

You want to remove as much CO2 gas as possible from a water solution. Which of the following treatments would? a. cool the solution b. filter the solution c. boil the solution d. aerate the solution

Which definition describes activation energy? the speed which reactants form products in a chernical reaction the short-lived, high - energy intermediate between reactants and products the diagram showing a change in energy between reactants and

How is momentum conserved in a system wich two satellites connect

What is the Celsius equivalent of 212°f

Identify the characteristics of tornadoes and hurricanes

When magma intrudes parallel to another rock layer, the formation is called a (n) A. sill. B. dike. C. extrusion. D. unconformity.

What is the net amount of energy released when 1 mole of H2O is produced

Why is Sn (SO4) 2 named Tin (IV) Sulfate and not Tin (II) Sulfate?