A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have?

13

9

5

4

What is the pH of a 2.4 M solution of HClO4

Solid carbon is known to react with oxygen gas to produce carbon dioxide. If a mass of 1.2g of carbon is burned in oxygen, 4.4g of carbon dioxide is found to form. How many grams of oxygen gas reacted with carbon?

Add single electrons and/or electron pairs as needed to complete the electron-dot symbol for astatine.

Explain in you own words, why molecules sometimes attain three-dimensional shapes rather than just being flat.

Cuantos miles de sulfato de calcio están en 60 gramos de sustancia

If a sealed syringe that contains some gas in heated in which direction will the syringe plunger move

Use the drop‑down menus to label the statements as either true of false. Dichloromethane is flammable. true false Methanol is flammable. Concentrated sulfuric acid is corrosive. 10% sodium carbonate solution must be used in the fume hood.

What is the process all rocks are continuously in during which that can change into other types of rocks

Collagen is made of fibers and is found in tendons and cartilage. Collagen contributes to meat toughness and is, therefore, an example of which type of protein?

1. Why does CH30 evaporate faster than water?