2. This graph shows the energy involved in a reaction involving two molecules. Describe what is happening or what the state of the reaction is at A, B, C, and D. Then tell if this is an exothermic or an endothermic reaction.

Calculate the mass in grams of 1.2044 x 10^24 atoms of lead (Pb). A.) 207.2 g B.) 2.0 g C.) 0.50 g D.) 414.4 g

What model is the basis for chemistry?

Which type of reaction does Sn2 + → Sn4 + represent?

Which of the following is a possible set of quantum numbers for an electron? A.) (1,1,0+1/2) B.) (2,1,2,+1/2) C.) (4,2,0,-1/2) D.) (3,-2,1,-1/2)

Which phrase describes an abiotic factor? A. fish in a pond B. bacteria on the skin C. air temperature D. number of species on a seashore

A compound that changes color when it comes into contact with an acid or base is an?

1. A food sample is burned in a calorimeter that contains 2000. g of water. The temperature increases from 22.0°C to 44.3 °C. How many Calories does the food sample contain, assuming all of the energy from the food was transferred into the water?

Why doesn't water light on fire? It has all the ingredients except heat! Hydrogen for the flammability factor, oxygen so it can keep burning, and all you need to do is add heat and BOOM you have a flame! 15 pts

The type of social bonds present in modern societies that are based on difference, interdependence, and individual rights is called:

The difference between ionic covalent and metallic bonding