Welcome to Murph's World!

Hello Fellow Chemists,

Here is some information that you will find useful: 

 

Today's Mission:

• Read the information below, starting with "How to Access Lessons." 
• Look over the information in tab at the top of the blog that pertains to your class (for example, SCH3U Intro).  
• You and your parent/guardian must sign the Course Information Sheet, Syllabus and Safety Contract. 
  
• To save paper, write "I have read and understood the CIS, syllabus and safety contract.  Signed __________(you)    ________(parent)" on a piece of paper.  Send me this through an Edsby message.
• Do the Diagnostic Quiz at the bottom of that same tab.
  

How to Access Lessons:

All lessons (many with accompanying videos - mainly made by me), homework and answer keys can be found on this blog. 

A course timeline, with hyperlinks to the appropriate blog lesson, is posted on Edsby.

  

How to Access Help:

You can seek out help/clarification when the need arises by asking during class or contacting me on Edsby.  

I also strongly encourage you to start/become a part of a group chat.  The hive mind is typically stronger than the individual.  😃

Hispanic Chemists You Should Know

Hispanic and Latino chemists have made amazing contributions to the world of science.  

 ¡Echale un vistazo!

 

LGTBQ+ Chemists You Should Know

LGTBQ+ people have contributed their knowledge, passion and curiousity to the study of chemistry.  Their contributions should be more widely celebrated.

Black Chemists You Should Know

These chemists have changed the world through their contributions to the field of chemistry. 

 Take a look here.

Indigenous Scientists You Should Know

Indigenous people contributing to STEM areas of study is deserving of acknowledgement.

Check it out.

Arab & Persian Scientists You Should Know

Arab and Perisan people have a long and illustrious scientific history.  Unfortunately, their names are not well known.  Let's remedy that.

Female Chemists You Should Know

Unfortunately, women have not always been allowed to study the sciences.  What a waste of half the Earth's population.  Imagine where we would be now had women always been allowed in the halls of science...

Check out my sister chemists! 

Asian Chemists You Should Know

Asian people contribute greatly to the fields of chemistry.  Here are a few of those people. 

SNC 2P - Chemistry - Acid Rain

What is acid rain?  Let's find out.

How does acid rain affect you?  Let's find out. 

 

Acid Rain Reading Assignment

 

This reading is from a pamphlet, so the order to read it is a bit odd.  Read the section between the arrows on the first page.  As for the second and third pages, they were originally like a centrefold.  So, read across the top of the second page, then the top of the third page, then the bottom of the second page and finally the bottom of the third page.  Whew!!

 

Answer all questions in full sentences.  Turn in your work on Edsby by 2:15 today.

SNC 2P - Chemistry - Acid-Base Neutralization Reaction

Acid-Base Neutralization

Acids and bases, when combined together in equivalent amounts, will neutralize each other.

This reaction is called an acid-base neutralization reaction or simply, a neutralization reaction.

A neutralization is a special example of a double replacement reaction:

Acid     +     Base     →     a Salt     +     Water

hydrochloric acid + sodium hydroxide → sodium chloride + water

HCl     +     NaOH     →     NaCl     +     H₂O

 

Want to see the above neutralization reaction being carried out in a lab?  Click here.

 

Question of the Day #16:

Read p. 167.  Choose a profession and answer the following questions: 

1.  What profession did you choose?

2.  What dangers does this profession face?

3.  What precautions can be taken to reduce the risk?

Spoiler Alert!

Here's a little intro for tomorrow's lesson.  Here's a bit more goodness. 

SNC 2P - Chemistry - pH Scale

The acidity or basicity of a substance can be indicated using an indicator’s colour change or by using numbers.

The pH scale is a sequence of numbers ranging from 0 to 14 (although it is possible to have a pH lower than 0 or greater than 14).  The pH value is a indication of hydrogen ion (H+) concentration. 

• Lower numbers (0 to just before 7) indicate an acidic substance.
• Higher numbers (just above 7 to 14) indicate a basic substance.
• Exactly 7 indicates a neutral substance (which is neither acidic nor basic).

 

Check out this video, for some more pHantastic chemistry! 

The term "pH" stands for "power of hydrogen," since an increase (or decrease) of pH by 1, represents a ten-fold change in hydrogen ion concentration.  Thus, small changes in pH relates to large changes in acidity or basicity strength.  

Each time the pH value changes by one, the strength of the acid or base changes by ten times.  For example, an substance with a pH of 2 is ten times more acidic than a substance with a pH of 3.

Environmental scientists are very concerned about changes in pH when in comes to bodies of water on Earth.  Let's find out why.

Now, let's make like a referee and get neutral.

 

SNC 2P - Chemistry - Acids & Bases

Acids

Acids are found in many substances we use on a daily basis, like lemons and other citrus fruits, vinegar, grapefruit and  milk.

Although foods that contain acids are safe to eat, not all substances that contain acid should be eaten.

Many acids are corrosive and this makes them dangerous to eat or have on your skin, as the acid will “eat away” at your tissues.

Acids are substances that increase the concentration of hydrogen ions (H+) when placed in aqueous solution. 

They have the general formula HX, where X represents an anion.

What are the strongest acids in the world, you may ask?

 

 

Bases

Bases are also found in many substances that we use on a daily basis, like antacids, tonic water, baking soda and bittersweet chocolate.

Bases can also be dangerous and corrosive, so caution is often required.

Bases are substances that increase the concentration of hydroxide ions (OH-) when placed in aqueous solution.

They have the general formula MOH, where M usually represents a metal ion.

Let's check out this video for some more acid and base love.

 

Indicators

Indicators are used to indicate the acidity or basicity of a substance by a change in colour.

Some common ones are phenolphthalein, bromthymol blue, litmus paper.

Want to make your own acid-base indicator?  Stay tuned.

Check out the cool way this high school student has used the colour changing properties of indicators to make a difference in the world.  Wow!

 

Homework:

Use the internet to find the answers for the following chart.

 

 

SNC 2P - Chemistry - Double Replacement Reactions

Double replacement reactions involve the swapping of elements between two different compounds.

The general formula is: 

WX     +      YZ     →     WZ     +     YX

or  

compound + compound → new compound + new compound

This is analogous to two dancing couples switching partners,

 

Some lone elements are “special” and will be found as diatomics or polyatomics: H₂, O₂, N₂, F₂, Cl₂, Br₂, I₂, P₄, S_8.

All other elements are monatomics:  Fe, Ca, Li, etc.

Remember:  Elements combined in compounds use their valances to determined the ratios in a compound.

 

Practice Questions:

For each of the following (a) complete the word equation, (b) create a balanced equation.

(a) barium iodide + silver sulfide  →

(b)  sodium chloride + tin (II) bromide   →

(c)  lead (II) sulfide + aluminum fluoride   →

 

Answers:

(a) barium iodide + silver sulfide → barium sulfide + silver iodide

             BaI₂        +      2AgS       →        2BaS        +     Ag₂S

(b) sodium chloride + tin (II) bromide → tin(II) chloride + sodium bromide

            2NaCl          +       SnBr₂        →         SnCl₂      +     2NaBr

 

(c) lead (II) sulfide + aluminum fluoride → aluminum sulfide + lead (II) fluoride

           3PbS          +          2AlF₃           →           Al₂S₃         +       3PbF₂

 

Homework:

Answers: