Give the symbol for magnesium.

Determine the velocity of a medicine ball (m = 10.0 kg) with a wavelength of 1.33 × 10-35 m.

One of the classic ways of defining a gas in comparison to, for example, a solid, is that the gas expands to fill all of the space in its container, whereas the solid has a fixed shape and dimension. Among the following, which represent a molecular-level explanation for this different behavior of a gas and a solid?

An element has three stable isotopes with masses of 27.977 amu, 28.976 amu, and 29.973 amu. The heavier two isotopes have an abundance of 4.68% and 3.09%, respectively. What is the mass of the element? (Hint: There is 100% total for all three)

Which of the compounds C3H8, MgCl2, Zn(NO3)2, OCl2 are expected to exist as molecules?

Chromium (Cr) is used in many engineering applications, to harden steel and make other metal alloys. The density of chromium is 7.2 g/cm3.  How many moles of chromium are there in a 1 cm3 cube of chromium (to 2 decimal places)?

Which of the following is the highest grossing film of all time in America?

One of the components in gasoline is octane. When octane undergoes combustion in an internal combustion engine, what describes q and ΔH?

You have probably heard enough about this already but learning how to learn in this course is just as important as the content. What we are telling you isn’t stuff we just made it, it is based on the latest research in teaching and learning. It is a myth that people learn different ways, at least in the context of subjects like general chemistry. Howard Gardner has described a theory of multiple intelligences, but this is controversial, and in general chemistry there really is only one way that students learn. All students need to construct their own understanding of the material by working with it, seeing different concepts in multiple contexts, this is described in the theory known as contructivism: This course is based on these ideas. You are given the opportunity to work with different concepts in many different contexts in the Learning Activities, assuming that you actually take them seriously! So, use the Learning Activities to construct your understanding of the material, and build your ability to solve problems, then, use the practice exams to do what?

Ethanol, CH3CH2OH, is a renewable, liquid fuel commonly made from plant materials such as corn, sugar cane, or grasses. It is also known as ethyl alcohol or grain alcohol. Ethanol is also frequently added to gasoline to make a mixture of ethanol and gasoline, called “oxygenated gasoline”. The oxygen in the formula provides more immediate oxygen during combustion, providing for more complete combustion and lower carbon monoxide emissions.When ethanol is added to gasoline, the two liquids never become unmixed again, What is the entropy explanation for this?