An object is placed on a triple beam balance, and a student moves the sliders until it is balanced with the pointer resting at the zero mark. When the pointer is resting, these are the positions of the sliders: What is the mass of the object? 340.9 g
493.9 g
439.0 g
934.1 g

What happens to energy in an open system?

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?