December 16, 2017

A sample of gas is in a rigid cylinder with a movable piston. The pressure of the gas is kept constant. If the Kelvin temperature of the gas is doubled, the volume of the gas is

(1) halved

(2) doubled

(3) tripled
(4) unchanged 

Answer and Explanation:

Looking in the back of the Chemistry reference table, we can see the combined gas law that gives us the relationship between gas, volume, and temperature. The formula is P1V1/T...

December 13, 2017

Which substance is an electrolyte?

(1) CCl4

(2) C6H12O6

(3) SiO2  

(4) H2SO4 

Answer and Explanation:

An electrolyte is the substance that is able to conduct electricity. Electricity is the flow of charged particles. Therefore, in order to be an electrolyte, we need to have charged particles. We can remember 3 types of substances that are electrolytes: metals, ionic compounds dissolved in water and strong acids/bases. To be a...

December 10, 2017

We are the edge of a world filled with incredible new advances in medicine thanks to a technique called gene therapy. Caroline and Cole, siblings from Arkansas, participated in a clinical trial in 2014 where they received a pioneering treatment using gene therapy that was able to restore their eyesight. Both children suffered from LCA prior to treatment.  Leber's congenital amaurosis (LCA) is a rare inherited eye diseas...

December 7, 2017

Even though human proteins are synthesized from only 20 different amino acids, there are thousands of different proteins found in human cells. This great variety of proteins is possible because the

(1)  size of a specific amino acid can vary within a protein

(2)  chemical composition of a specific amino acid can vary

(3)  sequence and number of amino acids can be different in each protein

(4)  same amino acid can have many...

December 4, 2017

These are the terms that you have to know for your upcoming MCAT test psychology and sociology part.

Group think is the tendency of members of the group to conform to the ideas and decisions of the group so that they do not stand out. For example, if you a part of a group and the group is deciding what pizza to order. If everyone in the group says that they like plain pizza, even if you like pepperoni, most likely you wi...

December 1, 2017

Which atom in the ground state has a stable electron configuration?

(1) carbon
(2) magnesium

(3) neon

(4) oxygen 

Answer and explanation: Electron configuration is the distribution of electrons in an atom. In order for the electron configuration to be stable, an atom (o

ther than Hydrogen and Helium) must have a full outer octet, or 8 electrons in it's outermost shell. Hydrogen and Helium only need 2 electrons to be stable.


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