Explain why a sewing needle can float on the surface of water in a glass

How are a person and a wax model of that person alike? How are they different?

A solution at 25 degrees Celsius with a pH of 7 contains a) more H3O + ions than OH - ions b) fewer H3O + ions than OH - ions c) an equal number or H3O + ions and OH - ions d) no H3O + ions or OH - ions

How many grams of acetylene react if 1.10 mol of CO2 are produced?

A sample of He gas (V = 3.0 L) at 5.6 atm and 25 °C was combined with 4.5 L of Ne gas at 3.6 atm and 25 °C in a 9.0 L flask (which was initially evacuated). What is the total pressure in the 9.

Hydrogen gas has been suggested as a clean fuel because it produces only water vapor when it burns. if the reaction has a 78.0% yield, what mass of hydrogen forms 545 kg of water?

How do find the volume of 60.0g of ether if the density is. 70g/mL?

Did the test solution react with the supernatant from the test tube that had the largest amount of precipitate? what can you infer about the molar ratio of this reaction?

Contrast mixtures with pure substances

A standard cell potential of which value describes a spontaneous redox reaction?

Using the combined gas law, if the volume of a gas at 155kPa changes from 22L to 10L. What is the new pressure if the temperature remains constant?