When copper is bombarded with high energy electron x rays are emitted. Calculate the energy (in joule) associated with photons if wavelength of x rays is 0.154nm

Balance the following half reaction in basic conditions. Then, indicate the coefficients for H2O and OH - for the balanced half reaction, and which side they appear on. Si (s) + Mg (OH) 2 (s) → Mg (s) + SiO32 - (aq)

A gas at 255 kilopascals and 45°C has an initial volume of 2.00L. The pressure of the gas increases to 805 kilopascals as the temperature is raised to 255°C. What will be the new volume? 1.05 liters 2.28 liters 1.25 liters 0.44 liters 1.50 liters

Is recording temperatures a kinetic or potential energy?

Which of the following elements is a nonmetal? a. selenium (Se) b. yttrium (Y) c. barium (Ba) d. calcium (Ca) e. All of these are metals.

What fundamental characteristic do all atoms of the same element have in common? a. Number of neutrons b. Number of electrons c. Mass number d. Number of isotopes e. Atomic number

What happens to the particles in a substance when it is cold?

What is the percent by mass of solute if 14.60g 74.95g of water?

7 An atom that has 13 protons and 15 neutrons is an isotope of the element (1) nickel (3) aluminum (2) silicon (4) phosphorus

The graph below shows how solubility changes with temperature. What is the solubility of Na2HAsO4 at 60°C? 20 g/100 mL of water 46 g/100 mL of water 65 g/100 mL of water 70 g/100 mL of water

Which statement regarding water is true? Energy must be given off in order to break down the crystal lattice of ice to a liquid. Hydrogen bonds are stronger than covalent bonds. Liquid water is less dense than solid water.