What is occurred when energy is taken in or given off

What is the wavelength of these waves?

In a chemical equation, the sum of the masses of the products is equal to the sum of the masses of the reactants. True False

Are Noble Gases nonmetals?

What rule is used to estimate your total stopping distance under ideal conditions? a. 4 second rule b. 2 second following distance rule c. 12 second visual lead rule d. 3 second travel rule

Fe2o3 (s) + 3co (g) →2fe (s) + 3co2 (g) in a reaction mixture containing 189 g fe2o3 and 63.0 g co, co is the limiting reactant.

Rutherford calculated that a gold atom is about 10,000 larger than its nucleus. Thinking about his experiment and its results, how did he come to this conclusion?

Which atom in the ground state requires the least amount of energy to remove its valence electron? (1) lithium atom (2) potassium atom (3) rubidium atom (4) sodium atom

Which of the following is the correct Lewis structure for ammonia (NH3) ? Note: Hydrogen and nitrogen have one and five valence electrons respectively.

Which statement about the electron-cloud model is true? A. It is the currently accepted atomic model. B. it can easily be replaced by existing models C. It specifies the location and momentum of an electron. D.

To the nearest gram, what is the mass of one spoonful of sugar?