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BONUS POINTS –  Do not skip this question! Why do the isotopes of the same element have the same atomic size? Why do the isotopes of the same element have different mass numbers?

A sick child has a temperature of 40.00 °C.   What is the child’s temperature in K?

In this course we will have lecture Monday, Wednesday and Friday. 

Perform each calculation to the correct number of significant figures. 4.562 × 3.99870 ÷ (452.6755 – 452.33)

Perform each calculation to the correct number of significant figures. 1.10 × 0.5120 × 4.0015 ÷ 3.4555

How many significant figures are in 0.04450 m?

How many atoms of oxygen are in 2.50 moles of  SO2?

What is the formula for determining The Maximum Number of Electrons Using Allowed Quantum Numbers?  

A man receives a ring from his fiancée, who tells him that it is made out of platinum. Before the wedding, he notices that the ring feels a little light for its size and decides to measure its density. He places the ring on a balance and finds that it has a mass of 3.15 g. He then finds that the ring displaces 0.233 cm3 of water. Is the ring made of platinum? Assume that the measurements occurred at 20 °C. (Note: The volume of irregularly shaped objects is often measured by the displacement of water. In this method, the object is placed in water, and the change in volume of the water is measured. The increase in the total volume represents the volume of water displaced by the object and is equal to the volume of the object.) YOU SHOULD KNOW THE FORMULA FOR DENSITY

Calculate the energy change associated with the transition from n=4 to n=1  in the hydrogen atom.