What happens when an electron moves from a high energy level to a lower one?

A. it absorbs light

B. it emits light

C. it disappears

D. it gets bigger

How many iron atoms are contained in 354 g of iron?

What is the reduction half-reaction for the reaction of zinc with hydrochloric acid?

Consider these changes. (a) Hg (l) - >Hg (g) (b) 3O2 (g) - >2O3 (g) (c) CuSo4*5H2O (s) - >CuSO4 (s) + 5H2O (g) (d) H2 (g) + F2 (g) - >2HF (g) At constant pressure, in which of the reactions is work done by the system on the surroundings?

Which of the following is a property of water a. polar molecule b. regulates temperature c. universal solvent d. all of the above

The formula for binary ionic compound formed between cesium and fluorine

How can hypothesis best be tested

Write a balanced equation for the combustion of 1 mol of C4H10O (l). Express your answer as a chemical equation. Identify all of the phases in your answer.

A thermonuclear chain reaction is considered to be a: -sustaining reaction in which the products cause new reactions fusion reaction because new material is combined many times }common phenomenon for all unstable uranium atoms proton creation

Which atoms are most likely to form covalent bonds?

Which phrase is the best description of weathering? A-Compacting Rocks B-Cementing Rocks Together C-Crystallizing to form minerals D-Breaking Rocks into fragments by physical or chemical means