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?

What would you multiply moles of fluorine (F) by to get the units atoms of fluorine? 

How many protons, neutrons and electrons are there in an atom that has an atomic number of 81 and a mass number of 209? [protons], [neutrons], [electrons] What is the symbol for the element? [symbol]

Which of the following correctly classifies this substance, CO?

A solid is added to a clear liquid and bubbles begin to form as the solid disappears. This change is most likely

Use the following scenario for questions 9a – 9c. A livestock company reports that the mean weight of a group of young steers is 1161 with a standard deviation of 74 pounds. Based on the model N(1161, 74) for the weights of steers, fill in the blank with the correct percentage. Show your work on at least one of the answers.

Use the following scenario for questions 8a – 8e Fuel economy estimates for automobiles built one year predicted a mean of 23.8 mpg and a standard deviation of 7.2 mpg for highway driving. Assume that a Normal model/distribution can be applied. Use the 68-95-99.7 Rule to complete the questions below.

__________% of steers have weights below 1300 pounds.