1. Johan started attending swimming lessons. On the first day, he

suffered from pain on his body as he had used a wrong technique to

jump into the water. Explain the reason for Johan's

injury. (Relate to water surface tension).

Which of the following organisms would likely be found on a decaying deer carcass (dead deer) ? a. Plant and animal b. Fungus and plant c. Bacteria and fungus d. All of the above

A student observed a chemical reaction in which the mass of the products was measured to be less than the mass of the reactants. How can this be explained?

If the products of a reaction are Co2 and 2H20, what is known about the reactants?

What is a physical intensive property?

Describe the behavior of an oxygen molecule in a sealed container

Which pair of elements can form an ionic compound? A) Two atoms of hydrogen B) One atom of sodium and one atom of fluorine C) One atom of calcium and one atom of chlorine D) Two atoms of hydrogen and one atom of oxygen

Two members of the Boron family owe their names to bright lines in their emission spectra. Indium has a bright indigo blue line (451.1nm) and Thallium has a bright green line (535.0 nm). What are the energies of these two spectra lines?

Whats the answer to 7/2 * 1/5?

Which statement correctly describes the relationship between reactant and yield? The actual yield is calculated from the amount of the excess reactant present. The actual yield is calculated from the amount of the limiting reactant present.

Balance the following reaction. Leave the box empty if no other coefficient is needed. C2H5 + O2 → CO2 + H2O