A sample 7.12 x 1025 atoms of molybdenum (Mo), what would the mass of the sample be in kilograms (kg)?

If a system releases heat and the volume of the container increases what are the signs of q and w? 

How many sigma and pi bonds are in the structure below?

What is the formal charge of nitrogen in nitrogen tetrachloride (NCl4+)? 

Which of the following is correct formula for hydroiodic acid?

How many moles K3PO4 would be produced if 15 moles of KOH were used in the reaction? The balanced chemical equation is given below.                       3KOH  +  H3PO4 ⟶  K3PO4  +  3H2O  

Determine if the following molecules are polar. 1 is 2 is  3 is   4 is  

Using the data below on successive ionization energies, determine what the element could be?    Number of Electrons Removed  Ionization Energies (kJ/mol)   1  1000  2  2000  3  5000  4  7,500  5  21,000  6  23,000  7  25,000 

A flask contains 15.8 mL of a 1.42 M aqueous solution of KMnO4. A student adds 100.0 mL of water to the flask. What is the concentration of KMnO4 in the flask after the addition of the water?

Case Study for Critical Thinking on Test Mrs. Song is a Korean-American woman living in Buffalo, NY who is 77 years old. She practiced Tai Chi regularly and had maintained her weight for many years. But now she has a fracture in her foot that prevents her from exercising as she used to do, and her muscle mass has gone down lowering her weight over the past 6 months from 132 lbs to 128 lbs. She lives alone and doesn’t drive so has to rely on a neighbor to do most of her shopping. She eats 3 simple meals a day and her diet consists mostly of white rice, many vegetables including pickled vegetables, small amounts of fish, and some fruit. She doesn’t drink sweet drinks or alcohol and seldom eats sugary foods. She has to eat soft, well-cooked foods as her dentures fit poorly. She has come to you for advice on her health. ***** Write one well stated Concept. As throughout class, this should be about a point of main concern, and something you can do something about. Other factors of a well written Concept include getting right to the point, not wordy, clearly stating the population, a standard, and why concerned. There are several different possibilities here, so do not worry about figuring out what the MOST important one is. Just make sure yours is useful and relevant. Also, you may know a standard for your concept, but if you do not recall it, you can ‘invent’ the standard such as if your Concept was about lack of iron then you can invent the RDA of say, 12mg.  *****  Worth 4 points