Answering at least a question in SOCRATIC has been a new habit I recently developed. The subjects are basically divided into three main groups: Science, Math and Humanities. The dedication shown by the community is just amazing, so much effort put in when answering the questions posted.

It’s really too bad that SOCRATIC decided to close the website to contribution effective from Aug 15, 2018. That’s why I decided to log the questions I have answered here.

**CHEMISTRY**

**Measurement**- SI System of Measurement
- Scientific notation
- Unit conversions
- Density
- Temperature

**Matter**- Classification of matter

**Ionic Bonds**- Formula
- What would be the correct formula of the ionic compound formed if a certain metal M with valence electron configuration Ns2 reacted with a nonmetal valence electron Ns2 Np4?
- Please,why is MnO2-4 i.e manganese(vi)oxide not MnO3?…i still dont get it..i mean if u calculate the oxidation number with the latter it’ll still be +6
- How do polyatomic ions differ from monatomic ions?

- Formula
**The Mole Concept**- Atomic mass
- Mole
- Empirical and molecular formulas
- Percent composition

**Periodic Table**- Metals and nonmetals

**Intermolecular Bonding**- Polarity of bonds

**Electron Configuration****Chemical Reactions**- Reviews of elements and compounds
- Balancing chemical equations
- Double replacement reactions

**Stoichiometry**- Equation stoichiometry
- How do you balance C 2 H 5 O H ( l ) + O 2 ( g ) → C O 2 ( g ) + H 2 O ( g ) and determine the mass of C O 2 produced from the combustion of 100.0 g ethanol?
- How many grams of hydrogen are necessary to react completely with 2.3 moles of nitrogen, in the reaction N2+3H2 = 2NH3?
- Calculate the weight of iron at which will be converted into its oxide by action of 18 gram of steam Fe+H2O —-heat——->Fe3O4+H2?

- Equation stoichiometry
**Gases**- Gay Lusaac’s law
- Charles’ law
- Combined gas law
- Ideal gas law
- Dalton’s partial pressure

**Solutions**- Measuring concentration
- %(m/m)
- What is the percent by mass of the solute of a solution made by dissolving 29 grams of sodium lithium chloride in water which has a density of the solution of 1.00 grams/ml, to a final volume of 202 ml solution?
- What is the mass percent of salt in a solution that made by dissolving 10g salt in 60g H2o?
- How many grams of NaCl are needed to prepare 35 kg of a 5 % (m/m) solution?
- Calculate the concentration (% m/m) of a solution that contains 27.5 g of NaOH dissolved in 200 g of water?

- %(v/v)
- Molarity
- Dilution
- A stock solution of hydrochloric acid with 1.25 M, 25 mL was diluted to 75 mL with water. What was the new concentration of this diluted acid?
- A stock solution contains 5 g per 100 ml of sucrose. How many ml of this stock solution would you use to prepare 1 litre of sucrose solution at a concentration of 0.25 g per litre?

- %(m/m)

- Measuring concentration
**Acids and Bases**- Acid and Bases Theories
- Conjugate acid and base
- Ionization constant
- Calculations

**Organic Chemistry**- Hydrocarbons
- Biomolecules
- Polymer Chemistry
- Aromatic Compound
- Bonding

**ORGANIC CHEMISTRY**

- Ways to represent molecule
- Hybridization and Atomic and Molecular Orbitals
- Functional Groups
- IUPAC

**ALGEBRA**

- Reese brought 2 sandwiches for her school lunch. Each sandwich was cut into fourths. After she ate lunch, Reese had 3 pieces of sandwich left. How many pieces did Reese eat?
- How do you solve this system of equations: 2x+y=−2and5x+3y=−8?
- Sarah has made 21 bracelets to sell at craft fair. If this is 70% of the bracelets she wants to make, how many more bracelets does she need to make?
- Jillian works 2 jobs. She earns $8.25 her first. She earns $10.15 at her second. If Jillian earned a total of $387 by working x hours at her first job and y hours at her second job, how do you write an equation that represents this situation?
- How do you find the values of x given 4×27+3×34−94=x?
- If y=kx, where k is a constant, and y=24 when x=6, what is the value of y when x=5?
- What is the luggage fuel cost in Canadian dollars for each airline if all passengers bring the maximum luggage (see picture for details)?
- Ms. Koblin commutes 1.5 hours per day to work. If Ms. Koblin spent 28.5 hours commuting, how many days was she driving to work last month?
- How do you factor by grouping 7−2x5−3+2+12?
- How do you evaluate −5−−414+314+−6?
- If one copy of a new book by Amanda’s favorite author cost $9.45. If a total of 2,740 copies of the book were sold on the first day of the books of the book’s release, what were the total sales that day?
- For her birthday party, Melonie wants to make a punch drink made with 2 1/2 gallons orange juice, 4 quarts cranberry juice, and 3 quarts apple juice. How much punch will she make?
- Latanya made a 17-minute phone call from her hotel in France and was charged 17 euro. At the time, $1 was worth 0.82 euro. Find the cost per minute of the call in dollars?
- Maggie is rock climbing. After reaching the summit, she descends 14 feet in 213 minutes. If she continues at this rate, where will Maggie be in relation to the summit after 8 minutes?