What does a chemical formula like Na2CO3 tells us?

A cobait uon has a charge of + 2. how many electrons does it have?

A solid block of exactly 100.0 cm3 has a mass of 153.6 g. determine its density. will the block sink or float on water?

Why would you add a buffer to a reaction if all of the solutions are already neutral (pH 7) ?

A youngs's double slit has separation of 2.5 x 10-5 m on wich a monochromatic light bean is directed. the resultant bright fringes on the screen 1.0 fro the double slit are separated by 2.3 x 10-2 m. What is the wavelenght of this bean?

What mass of hydrochloric acid (in grams) can 2.7 g of sodium bicarbonate neutralize? (Hint: Begin by writing a balanced equation for the reaction between aqueous sodium bicarbonate and aqueous hydrochloric acid.)

The volume of oxygen required for complete combustionof a mixture of 5 cm3 of ch4 and5 cm3 c2h4

What part of the digestive system removes most of the water from food? Question 4 options: Small intestine Stomach Large intestine Esophagus Save

In which type of chemical bonding are electrons shared among all atoms in the substance?

As pressure decreases, density: A. decreases B. increases C. remains the same

Use the unbalanced equation NH3+O2--> NO+H2O to find the mole ratio between NH3 ad O2