How many protons are in the nucleus of an atom with an atomic number of 15?

Write the balanced molecular equation for the reaction of barium hydroxide with perchloric acid. What is the coefficient of H2O?

3Ni2 + (aq) + 2Co (s) ⟶2Co3 + (aq) + 3Ni (s) Which substance gets oxidized?

A student did an experiment on the cycling of environmental gases. She placed water and bromthymol blue in each of four test tubes. No other items were placed in tube 1.

Look at the chemical equation: 3H2 + N2 → 2NH3 How many atoms of hydrogen (H) are present on both sides of the equation? 2 3 5 6

Using the relationship given in part 1, calculate Ecell if [Cu2+] = 1.453 M and [Cr3+] = 0.00176 M, assuming that the temperature remains at 25°C. Give your answer to two places after the decimal.

Explain the iodine clock reaction.

1 75 ml of lemon juice are added to 50 ml of water. What is the percent by vo of the solute?

How many moles of tungsten atoms are in 4.8 x 1025 atoms of tungsten?

At what speeds do you criuse down the track of a roller coaster

A sample of hydrogen gas is mixed with water vapor. The mixture has a total pressure of 755 torr and the water vapor has a partial pressure of 24 torr. What amount (in moles) of hydrogen gas is contained in 1.55 L of this mixture at 298 K?