Which is a chemical change, water boiling, wood burning, glass breaking, ice melting, or molding iron?

A 10.0 L balloon contains helium gas at a pressure of 655 mmHg. What is the final pressure, in millimeters of mercury, if the final volume is 13.8 L?

What is difference between ionic and covalent bond.

What is the percent composition by mass of nitrogen in NH4NO3 (gram-formula mass = 80.0 grams/mole) ? (1) 17.5% (3) 52.5% (2) 35.0% (4) 60.0%

If a given solution has a 30 percent solute concentration, and more solute is added to the solution, the new solute concentration could be:

How many atoms are in 80.45 g of magnesium? (Enter the number in scientific notation with units!)

Which organelles are unique to plant cells? chloroplasts mitochondria vacuoles nuclei

An atom that has 13 protons and 15 neutrons is an isotope of the element? How can I count it?

Which element is nuclear fusion least likely to produce? hydrogen, which has an approximate mass of 1 chlorine, which has an approximate mass of 35 argon, which has an approximate mass of 39 silicon, which has an approximate mass of 28 I know the

How deep does the surface current known as the Gulf Stream go A. 3,000 meters B. 3 meters C. 300 meters

What characteristics of a planet determine the strength of its gravitational force on other objects? A. diameter of the planet and its location in space B. the number of moons that the planet has C.