September 27, 2019

Which compound is an electrolyte?

(1) CH3CHO

(2) CH3OCH3

(3) CH3COOH

(4) CH3CH2CH3

Answer: Choice 3 CH3COOH is the correct answer choice

Explanation:

Electrolytes are compounds that can conduct electricity.

Electrolytes are: 

Ionic compounds melted or dissolved in water (ionic means metal +nonmetal, metal +polyatomic ion, or two polyatomic ions together).

Acids (The list of acids is on the Regent Reference table) 

Bases (The list...

September 25, 2019

How To Name Acids 

An acid is a substance that releases H+ ions (hydrogen ions) when it is dissolved in water.

Acids can be divided into 2 categories: binary acids and oxyacids.

Binary Acid - consists of H + nonmetal

Examples of binary acids are HCl, H2S, HBr

Naming a binary acid - HYDRO _____ IC ACID

HCl - hydrochloric acid

H2S - hydrosulfuric acid

Oxoacid - consists of H + Polyatomic ion containing O

Examples of oxoacids are H...

September 18, 2019

When Can Carbocation Rearrangements Happen?

Carbocation Rearrangements can occur in reactions whose mechanism goes through carbocation (C+) intermediates. These reactions are SN1, E1 and the reaction of alkenes (c=c) with an acid.

How do I know if the carbocation rearrangement will happen during my mechanism?

If you have a carbocation and the neighboring carbon is more substituted, you need to do the rearrangement. Most of...

September 17, 2019

January 2019 Chemistry Regent

During which phase change does the entropy of a sample of H2O increase?

(1) H2O(g) → H2O(l)

(2) H2O(g) → H2O(s)

(3) H2O(l) → H2O(g)

(4) H2O(l) → H2O(s)

Answer and Explanation:

Entropy represents disorder in chemistry. Universe wants to be as disordered as possible and therefore increasing disorder, or entropy, is favorable. Now, lets lookout phases to figure out what is more d...

September 14, 2019

There is a simple and easy way to identify ionic  versus compounds.

Ionic compounds can be of three types:

1. Metal + Nonmetal

To figure out whether an element is a metal or a nonmetal, look at the periodic table. Elements on the right of the staircase on the periodic table are metals. Elements to the left of the staircase on the periodic table are nonmetals. Hydrogen is a nonmetal even though it is located on the rig...

September 12, 2019

August 2019 Chemistry Regent Exam

Write the general formula for the homologous series to which propene belongs.

Answer: This questions mentions homologous series, which are groups of organic compounds. We can look at the Regent Reference Table Q, that is titled "Homologous Series of Hydrocarbons" to figure out the answer to this question. Propene is an organic molecule that has an ending "ene", which means its belongs to...

September 11, 2019

SAT Chemistry practice from College Board

The hydrogen ion concentration of a solution prepared by diluting 50. mL of 0.10 M HNO3(aq) with water to 500. mL of solution is

(A) 0.0010 M 

(B) 0.0050 M 

(C) 0.010 M

(D) 0.050 M 

(E) 1.0 M

Answer and Explanation:

One of the key words in this question is diluting. A solution gets diluted when more water is adde...

March 20, 2018

Organic Chemistry formulas:

Alkanes, alkenes and alkynes are three classes belonging to the hydrocarbon homologues series. These are organic compounds that are composed of carbon and hydrogen as their name implies. 

Alkanes have only single bonds, and are therefore saturated hydrocarbons. Their formula is CnH2n+2. Thus, for example four carbon alkane will be C4H 2(4)+2 = C4H10

Alkenes are unsaturated because they have a do...

April 4, 2017

Rules: 1. The more halogens are on your carboxylic acid, the more acidic it is 2. The closer the halogen is to the carboxylic acid group, the more acidic the molecule is.

January 28, 2016

 

Tutoring has been proven to be very successful in helping students achieve high grades in their General Chemistry classes.

 

General Chemistry is a problem based subject. Usually, 90% of the test questions involve problem solving and the rest is theory.

Therefore our tutoring involves a lot of practice. We do not believe in lectures or monologues. Student should be as involved as the tutor during the course of the session...

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