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] 

What is the mass number of an atom that contains 26 protons, 29 neutrons, and 26 electrons? [massnumber] What is the symbol for the element? [symbol]

Classify the following as either a pure substance, a homogeneous mixture or a heterogeneous mixture: apple juice

Classify the following as a chemical or physical change: melting wax

Classify the following as either a pure substance, a homogeneous mixture or a heterogeneous mixture: baking soda, NaHCO3

Classify the following as a physical or chemical property: The colorless gas hydrogen, reacts explosively when ignited in air.

After the age of 65, the recommended daily intake of calcium is 1500 mg. If a person takes in 975 mg/day, what percent of the recommended daily intake is the person receiving?