Which chemical equation is unbalanced?

1. C + O2 → CO2

2. Sr + O2 → 2SrO

3.6H2 + 3O2 → 6H2O

4. H2 + H2 + O2 → H2O + H2O

A chemist must prepare 900.0mL of potassium hydroxide solution with a pH of 13.80 at 25°C. He will do this in three steps: Fill a 900.0mL volumetric flask about halfway with distilled water.

The combining of atoms is known as nuclear fusion. true false

Sulfur and oxygen form both sulfur dioxide and sulfur trioxide. When samples of these are decomposed, the sulfur dioxide produces 3.49 g oxygen and 3.50 g sulfur, while the sulfur trioxide produces 6.75 g oxygen and 4.50 g sulfur.

Using the periodic table, predict the classification of iodine and elaborate on the reasoning. A) Iodine is a noble gas and has a full valence electron shell, is chemically non-reactive, colorless, odorless, and is a gas at room temperature.

A mammoth skeleton has a carbon-14 content of 12.50 of that found in living organisms True/False

Calcule o calor especifico do estanho sabendo que foram necessarias 100 cal para elevar em 20ºC a temperatura de 100 g de estanho

What's the smallest part of a compound

The inertness of the noble gases is due to a. the outermost shell has six electrons. b. the bonds they form with other elements. c. the number of protons and neutrons. d.

Xander is gaining weight. Which best describes what he can do to prevent obesity? exercise every day and also make healthy choices in his diet excercise once a week but make no change in his diet exercise once a week and also make healthy choices in

The town in the video stressed using locally made goods instead of imported goods. How could using locally made goods lower CO2 emissions?