Which is the number placed in front of an element's symbol in a chemical formula?

Mass of 2 mole of H2SO4

When a volcanic irruption adds new rock to existing land and forms new islands is it considered destructive?

Which of the following statements is true about the carbon cycle? Carbon molecules enter the atmosphere through the process of respiration. The carbon cycle describes how carbon moves between living and nonliving things in the environment.

An organism that lives in or on another organism, often with harmful side effects-but without benefits is a?

A gas exerts a force of 1000 N on a surface with an area of 5.0 m squared. What is the pressure on the area?

What mass of carbon can 3000 J of energy raise from 12°C to 40°C?

How do you balance __Mg + __HCl - - > __MgCl2 + ___ H2

How many grams of methane, CH4 are produced from the complete reaction of 5.15 moles of carbon monoxide, CO

If you change the state of something, say, liquid to solid, is it a physical or chemical change?

What type of calorimeter would be best to use if you wanted to measure the heat that is released when gasoline is burned?