Classify the following as a chemical or physical property: The purple crystalline solid potassium permanganate forms a purple solution when dissolved in water.

Record the volume of liquid in the graduated cylinder to the correct number of significant digits. 

When the measurements 83.88 and 81.6 are multiplied together, the answer should have ___ significant figures?  

Classify the following as either a pure substance, a homogeneous mixture or a heterogeneous mixture: freshly squeezed mixture of orange juice

Which of the following correctly classifies the substance, O3?

Determine the molecular weight for K3PO4.

After the age of 65, the recommended daily intake of calcium is 1500 mg. If a person takes in 1050 mg/day, what percent of the recommended daily intake is the person receiving?

What is the mass number of an atom that contains 83 protons, 131 neutrons, and 83 electrons? [massnumber] What is the symbol for the element? [symbol]

Use whichever of the following conversions necessary to convert 353 K to Fahrenheit. (Use only these equations – decimal answers will not be accepted).  °C = 5/9 (°F – 32) °F = 9/5 (°C) + 32 °C = K – 273    

How many protons, neutrons and electrons are there in a neutral atom of magnesium-25? [protons], [neutrons], [electrons]