A sample of gas is in a rigid cylinder with a movable piston. The pressure of the gas is kept consta

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/T1 = P2V2/T2. Since the pressure is constant, we can leave it out of the equation, leading to V1/T1=V2/T2. We can no determine what happens if the temperature is doubled. Since volume and temperature are directly proportional, if the temperature doubles, the volume will do

Which substance is an electrolyte?

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 an ionic compound, we must have a metal and a nonmetal. Looking at the answer choices we see nonmetals only. To search for strong acids and basis we can look at the reference table K. We can see that H2SO4 is a strong acid and therefore an electrolyte. Choice (4) is the cor

Genetic therapy helped children see

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 disease that appears at birth or in the first few months of life and leads to blindness by adulthood. The trial that used Luxturna product developed by Spark Therapeutics, was able to help children regain their vision. How did it work? Gene therapy takes the approach of replacing fa

Even though human proteins are synthesized from only 20 different amino acids, there are thousands o

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 different properties Answer and explanation: How are proteins made in our body? Proteins are synthesized from amino acids which are like the letters of an alphabet. And even though our alphabet is only 26 letters, how many words do we have? Hundreds of thousands. Therefore

What is the difference between group think and group polarization?

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 will say t hat you like plain as well to fit in with the group, thus showcasing groupthink. Group polarization, on the other hand, comes from the word "polar". Members of the group tend to polarize their views to the extreme in a group setting. For example when members enter a

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

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. Therefore, we need to search for atoms with a full octet on the Periodic Table. Noble gases (group 18) are called noble because of their stability. They are stable because they all have filled outer octet and thus, we should be looking for a noble gas among the answer cho