The change in energy needed to change the state of a substance is

A student observed a chemical reaction in which the mass of the products was measured to be less than the mass of the reactants. How can this be explained?

Given the equation: C2H6 + Cl2 - - > C2H5Cl + HCl This reaction is best described as (1) addition involving a saturated hydrocarbon (2) addition involving an unsaturated hydrocarbon (3) substitution involving a saturated hydrocarbon (4) substitution

What is the Sun's declination on the fall equinox? 0° 30° N 90° N

Question 22 Which change would cause the volume of a balloon to increase? A increasing the temperature of the balloon B increasing the atmospheric pressure C removing gas from the balloon D placing the balloon under water

The original atmosphere of earth had little oxygen. what was the likely first source of oxygen that led to an oxygen atmosphere?

How did coroners handle their responsibilities in the early 1900s? Why was there a need for significant change in the job?

Which of the following is the best indication that a chemical change has taken place? a. The matter changes color. b. A mixture separates into layers. c. The change is reversible. d. The shape of the substance changes.

This is not lost in a chemical Reaction (4 letter word second letter is A)

Which type of soil holds the least water

Eq-43 which type of fire extinguisher should be onboard a vessel with a permanently installed fuel tank