Which of the following describes a reduction reaction?

When a sugar cube completely dissolves when add to a cup of tea, the resulting solution is

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The unit of 1 atmosphere is equal to

The molar mass of calcium hydroxide Ca(OH)2, is

What effect would adding 1 mole of CaCl2 to 1 liter of water have on the freezing point of the solution?

The Ka of H2CO3 is 4.3 × 10-7. What is the pH of a buffer with 0.10 M H2CO3 and 0.10 M NaHCO3?

The number of neutrons in an isotope of an atom is equal to

How many moles of iron are present in 3.15 x 1024 atoms of iron

Silicon has three naturally occurring isotopes: Si-28 (mass = 28.0 amu); Si-29 (mass = 29.0 amu), and Si-30 (mass = 30.0 amu). If the average atomic mass of silicon is 29.1 amu, which isotope is the most abundant?