What are some chemical changes that happen at school, home, nature

Which substance yields hydroxide ion as the only negative ion in aqueous solution?

A 50 L cylinder is filled with argon gas to a pressure of 10130.0 kPa at 300°C. How many moles of argon gas does the cylinder contain? (Given: R = 8.314 L∙kPa/K∙mol) 2519.142 mol

Hershey and Chase grew some T2 phages in 32P-containing medium and then used that phage to infect a bacterial culture. After the infection they detached the phage heads from the bacteria using a blender.

What is the correct chemical equation for the reaction between methane and oxygen to produce carbon dioxide and water?

Which of the following is correct concerning Hess's law? A-The change of enthalpy of a reaction can be found be subtracting the enthalpy of the products from the enthalpy of the reactants.

Pure aluminum metal has a density of 2.70 g/cm

A 0.250-g chunk of sodium metal is cautiously dropped into a mixture of 50.0 g of water and 50.0 g of ice, both at 08C. The reaction is 2Na (s) 1 2H2O (l) 88n 2NaOH (aq) 1 H2 (g) DH 5 2368 kJ

How many moles of N are in 0.203 g of N2O?

An atom has a charge of +1 in its nucleus. Which statement must be true in order for this atom to have no net charge? A. The one positive proton has no influence on the overall charge of the atom. B.

A chemist uses 0.25 L of 2.00 M H2SO4 to completely neutralize a 2.00 L of solution of NaOH. The balanced chemical equation of the reaction is given below. What is the concentration of NaOH that is used?