What is the percent by mass of oxygen in carbon dioxide (CO2) ?

27.29%

57.12%

72.71%

79.99%

What is the molar mass of Mg?

2.5 piece of lithium is dropped into a 500 g sample of water at 22.1 C. ten temperature of the water increases to 23.5 C. How much heat energy is released in the reaction

Shari was in the kitchen when she heard a crash. She went into her bedroom and found her window broken and a baseball lying on the ground. Shari said "this baseball broke my window.

Some processes that occur in a cell are listed below. A. utilize energyB. detect changes in the environmentC.

You measure the absorbency of a 0.5 ml solution and you find that it is 1.2. you then dilute this solution by adding 0.5 ml of pure water, making the final volume 1.0. what will be the absorbency of the diluted solution?

Reaction rates are affected by how often the particles collide true false

A 25 N and 5 N force pull to the right. Friction is 10 N. If the object is 5 kg, find the net force and acceleration.

What properties of matter are intensive independent of their size

What is the density of an object having a mass of 8.0g and a volume of 25cm3

What is a Cilla? (In drawing)