Science Lab Challenge – Practice following directions and using lab equipment

lab equipment lesson thumbnailI developed this quick and easy activity to teach my middle school students about common lab equipment, safety procedures and how to work together in a lab. It’s also specifically designed to help them practice the hardest skill of all – following directions!

This activity encourages students to document and learn from their mistakes. They do not lose points for making mistakes; rather, they gain points by recognizing and correcting their errors. The pressure for perfection is off and the pressure for learning is on!

The activity is quite safe since the only substances used are water, food coloring, vinegar and baking soda.

Objectives of this activity are for students to be able to:
• Follow step-by-step directions in a lab
• Identify common lab supplies and their uses
• Cooperate with group members to complete a lab activity
• Explain basic safety practices that must be followed when doing a lab

See what other teachers have to say about this activity here. 

 

Find other science experiments and labs:
experimentation

Can I understand a nuclear reaction diagram?

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Nuclear Fission Diagram Questions (you will need a periodic table)

  1. U-235 – What element is this and how many protons and neutrons does it have?
  2. What type of matter collided with U-235?
  3. what are the three products of the nuclear fission event?
  4. How many protons and neutrons do Ba-144 and Kr-89 have?
  5. Add up all of the neutrons and protons in the products of the event, do they equal the number of protons and neutrons in the reactants? Explain.

Nuclear Fusion Diagram Questions (you will need a periodic table)

  1. In this diagram, which color represents neutrons? Protons?
  2. What element is deuterium? What element is tritium? Explain how you know this.
  3. What are the products of this fusion event?
  4. Do the number of neutrons and protons in the products equal the number of neutrons and protons in the reactants? Explain.
  5. Is the helium atom the most common isotope of this element? Explain.
  6. Explain why this is a fusion nuclear reaction rather than a fission reaction.

Laying the Foundation…

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Teaching Middle School Chemistry

As a middle school teacher I find one of the hardest parts of my academic work is to really pinpoint exactly what my students need to know at this level. I’m a details person and I like to dig into the subjects that I teach. My fear is that I’m not laying out the big picture well enough and get stuck in the weeds with the details. But the big picture doesn’t work without enough details so I can’t ignore the details. Now you know the type of arguments I have with myself.

I love chemistry. I love elements. I love atoms. I love electrons. Yes, I’m a total geek, but I can’t help thinking that it’s beyond amazing that we know so much about things we can’t directly see or experiment with. Everything is through indirect methods and ingenious ones. I’m always amazed at the creativity that it took for people to figure out all that we know about atoms. (This is somewhat beside my main point; except, the fact that I think it helps to be excited about what you teach, otherwise teaching can really suck.),

So, back to what I do with teaching chemistry to 8th graders. Below I’ve laid out my outline of topics in the order that I think works, after 8 years of fiddling with it. Every system has limiting factors so in figuring out what to teach I had to respect my limits – this is an introductory level AND it’s only a UNIT of 8th grade, NOT a year long course in chemistry.

My development of this unit reflects my personal teaching philosophy:

I am dedicated to giving my students an opportunity to build a foundation of knowledge and skills to take into high school courses. I want two things for them:

        1. They can walk into a high school course and feel confident that the knowledge they already have will support them in learning more. I am lucky in that I see my former students often and I ask them if I am doing a good job at this and they say yes. This comes from C students too. And, they are really thankful for it which is a major inspiration for me to keep pushing forward (otherwise, like I said, this job could really suck).

        2. I don’t expect my students to recall all the facts they learned, but I do hope they learned about analysis, drawing logical conclusions, and writing with precision. I do hope that they remember about analyzing experiments – the role of constants and variables, testable questions, placebos and trial sizes. At least this skill may save them from believing everything that they read on the internet and falling for junk science.

So, the question is, what are the foundational concepts that set the stage for deeper learning in the future? Also, what skills do I want them to learn in middle school that will give them more confidence for higher level courses, in this case, chemistry?

Here is my outline of concepts taught with some main points/vocabulary stated as well. It is just an outline so imagine that I’m filling in the blanks with (hopefully) all of the right details. The list is generally in the order in which I teach these concepts. I’ve included links to some of the lessons/worksheets I created to teach this unit. I’d love to know what you teach for middle school chemistry. Please share your comments and suggestions!

Atomic Theory and Structure of an Atom

  • Bohr’s model for understanding the atomic structure of the first 18 elements – protons and neutrons in the nucleus, electrons occurring at certain distances from the nucleus; these distances are energy levels (or shells); electron configuration rules for the 1st three energy levels. (no orbitals at this level)

  • Atomic theory history – Democritus – Dalton – Thomson – Rutherford – Bohr – quantum mechanical model – Chadwick

Free Atomic Theory Timeline Slides   Student Worksheet
Bohr Atomic Model – Warm ups or Exit Cards: Sample   Full Document
Chemical Element Mini-Research Project Full Document

Periodic Table and properties of elements

  • Arrangement by atomic number
  • Atomic mass – average atomic mass and mass of the most common isotope
  • Periods = number of energy levels
  • Groups – element in the same groups have similar chemical properties; valence electrons
  • Properties of particular groups – metals, nonmetals, highly reactive/less reactive, halogens, noble gases, metalloids

Structure and Composition of Matter

  • Atoms can bond and form compounds or molecular elements
  • Ionic compounds – ionic bonds, ionic bonding, Lewis dot diagrams to model bonding, properties of ionic compounds, crystal lattice, formula units
  • Covalent compounds and molecular elements – covalent bonds/bonding, Lewis dot diagrams to model bonding, properties of covalently bonded substances; molecule defined, chemical formulas
  • Metallic bonding – electron sea model, this model can be used to explain the properties of metals (luster, malleable, ductile, conductive, high melting point)
  • Mixtures vs. compounds and pure substances

Element, Compound or Mixture? Critical Thinking Exercises, Warm-ups or Exit Cards   Free Sample   Full Document

Matching Matter Worksheet:  Is it an element, compound or mixture?  Full Document


Introduce Chemical Bonding (Ionic, Covalent, Metallic) – Note-taking worksheets and practice exercises:  Free Sample  Full Document

Physical and chemical changes to matter

  • Physical changes to matter – kinetic molecular theory explains why matter changes phases; properties of solids, liquids and gases at the particle level; basic concept about the intermolecular forces that hold particles close together in the solid and liquid state and how these forces are overcome based on how much energy particles have)
  • Chemical change
    • Chemical equations
    • Endothermic and exothermic reactions
    • Combustion reactions
    • Acid/base reactions
    • Law of conservation of energy and mass
    • Balancing chemical reactions
    • Signs of a chemical reaction

Chemical Reactions Lab – 4 Easy and Fun Experiments for Middle or High School: Free Sample   Full Document

Nuclear Reactions

  • Fusion
  • Fission
  • Radioactive decay
    • Alpha particle
    • Beta particle
  • Transmutation
  • Nuclear energy to produce electricity

Fusion diagram with questions (Free)

The Respiratory System – A WebQuest

Respiratory system cover pageThis WebQuest is a breath of fresh air for a busy teacher. You can breathe easy as this assignment provides an engaging journey into the respiratory system.

1. Travel through the respiratory system to learn the parts of the lungs and how oxygen moves into the capillaries while carbon dioxide moves out.

2. Go beyond just the parts to learn why humans are nose breathers, fish have gills and dolphins have blow holes.

3. Don’t just read and watch, but do – practice activating the diaphragm to breathe deeply, try to talk while inhaling and learn why we don’t like to breathe through our mouths.

4. Discovery how some of our vaccinations protect you from lung diseases like whooping cough and pneumonia.

Click HERE to see the worksheet.

Student Links:

A. Go to: How Lungs Work Movie

B. Go to:  Your Lungs & Respiratory System

D. Learn about Asthma

E. Learn about Whooping Cough

F. Belly Breathing – Activate the Diaphragm

G. Why do we breathe through our noses?

H. How do fish breathe underwater?

I. Do whales and dolphins breathe like fish?

 

Pathogenic and Beneficial Bacteria Introduced

Includes a Google Doc Version for Distance Learning!

bacteria webquest cover

[Students – please scroll down for the webquest links]

The hardest part of teaching 6th-9th grade science sometimes is figuring out what information is essential for these students to learn so that they develop important background knowledge to propel them forward to deeper learning in upper high school courses and beyond. I struggle with this question all of the time.

It has taken a few years, but I think I have found the right balance when it comes to teaching about the bacteria kingdom. We learn about this subject twice – first, when study the basic characteristics of the different kingdoms of life. Second, when we study pathogens and the immune system, which is when my students do this webquest.

I developed this webquest to engage my students in the reasons WHY we study bacteria. This could seem like a boring subject, but bacteria are amazing, complex and scary. They are a part of our history as humans and literally a part of our bodies. Learning about bacteria can be frightening at times given the havoc they can cause, but its through learning and studying them that we quell our fears.

For one, kids often are given the impression that all bacteria are bad and disease-causing. The exact opposite is true and most bacteria are harmless or are doing a job directly for us or in the environment that we rely on. Learning about this makes them a lot less scary. And yes, some do harm us, but by studying them and engaging with them, we learn to stop and prevent their infections.

**The student links are those students visit as they complete the webquest. Click HERE to see the worksheet.** Click here to find out about my unit on pathogens. Click here to learn about my Pasteur and Redi Spontaneous Generation activity.

Webquest Student Links

Reading, What are Bacteria?

Disease-Causing Bacteria, Video 1

Alexander Fleming, Video 2

Reading, The real story behind penicillin

Reading, What about Good Bacteria?

Reading, The Danger of Antibiotic Overuse

cover page pathogens

Bacteria Basics

What are bacteria and why should I care?

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Did your mom ever make you drink a thick, overly sweet, sort of grape-flavored liquid twice a day for about a week? Were you told that the doctor said you had to drink all of it to feel better? I hope so because that was the truth; of course, that doesn’t make it any more pleasant.

This “drink” is a medicine; specifically, an antibiotic. Antibiotics are a special group of medications that have one job – kill every single bacterium that is making you sick. Drinking it probably seemed pretty gross, but in reality, you are very lucky. Almost no one had the luxury of such a medicine to make them feel better, and possibly save their life, before the 1940s.

Without you knowing it, bacteria are very much a part of your daily life. For example, people in your life aren’t telling you to wash your hands and use hand sanitizer just to be annoying; rather, they are trying to protect you from transferring bacteria from your hands to your food.

Did you eat yogurt or cheese recently (like parmesan or cheddar)? Perhaps you ate some kimchi, miso or olives. If so, then you were enjoying some delicious foods made with bacteria. In some of these foods the bacteria are still alive as you eat them, and after you eat them.

Have you ever had an ear infection or strep throat – two common childhood bacterial infections? This would be when you had to drink all of your medicine. Have you had vaccinations? Some of those are to prevent illnesses caused by bacteria, such as whooping cough and tetanus.

Here’s a handy little fact – about half of the cells within your body are not yours, and they are not human either. They are bacteria. They live mostly inside your intestines. Lots are on your skin too. All of the time. And you can’t make them go away. Ever.

A single bacterial cell is called a bacterium; bacteria is the plural form. The word has a Greek and Latin origin – “bac” means rod or staff. This prefix was used because the first bacteria ever viewed were rod-shaped. Later we learned that bacteria can be spherical or spiral-shaped too.

Prokaryote_cell.svgA basic description is that bacteria are microscopic, single-celled prokaryotic organisms. There are more of them on Earth than all other life forms combined. Archaea are similar organisms, but have a different biochemistry and an evolutionary history that puts them in their own kingdom. You have some of those living inside you as well (yeah!).

Bacteria are prokaryotic because their cells lack some of the complex structures found in the cells of plants, animals, fungi and protists. This means that bacteria do not have nuclei or other parts such as mitochondria and endoplasmic reticula.

All cells have DNA and bacteria have a single circular strand that is in an area of the cytoplasm called the nucleoid. Most bacteria have a cell wall and some have another outer layer called a capsule. The capsule makes it harder for immune cells and cleaning products to kill them, which is why a lot of disease-causing bacteria have them.

Many bacteria also have pili, which are hair-like extensions surrounding the capsule that allow the bacterium to stick to surfaces, such as the inside of your intestines. Bacteria that use energy from the sun have whip-like extensions called flagella that they use to move toward light. 

Research suggests that bacteria developed in oceans about 3.5 billion years ago. They now occur nearly everywhere on the planet – deep in the soil, within rock and ice, in hot and acidic waters, and high up in the clouds. They live on your skin, and in your digestive tract. Actually, they are believed to live in the digestive tract of all animals that have one.

Bacteria are often referred to as germs – microorganisms (or microbes) that can cause disease. In reality, most of the bacteria species in the world do not cause diseases in humans and are very beneficial to us. This article discusses both.

What should I know about disease-causing bacteria?

Disease-causing bacteria are called pathogens. Pathology is the study of pathogenic (disease-causing) organisms. Viruses and fungi can also be pathogens. There are some bacterial pathogens that can make us very sick or kill us. Really bad bacterial infections can give us really gross symptoms such as bloody vomit and watery diarrhea. They can make you cough up thick lung mucus and a few types can eat away at your skin.  

If a single pathogenic bacterium enters your body and begins to reproduce you have an infection. However, not all infections result in you feeling sick. Your immune system may kill off the bacterium and its descendants before it can do enough damage for you to have any clue that they were ever there.

You will feel sick if the invading bacterium has reproduced enough to cause many of your cells to become damaged. Bacteria do not damage cells because they are mean and don’t like you; rather, they are just trying to have a meal.

Your cells are made of organic compounds (proteins, carbohydrates, nucleic acids and fats) and water. Bacteria need these compounds to grow, function and reproduce just like all other living things. They breakdown your cells into organic compounds so that they can absorb them. This gives the bacterium the energy and building blocks it needs to reproduce through cell division. Now you have even more bacteria inside you which leads to more of your cells being destroyed.fever-310721_1280

Some of the symptoms we experience, such as a fever, headache and rash, indicate you might have an infection. While unpleasant, the symptoms are signs that your immune system has gone to war against the invader.

Your immune system might be able to kill off the infection on its own, and after a week or so you feel better. However, with a bacterial infection you might need those bacteria-killing medications, antibiotics. The bacteria may multiply so fast or produce toxins that can make people very sick or kill them without antibiotic treatment. Unfortunately, there are times when no treatment works and people die from the infection.

Pathogenic bacteria can enter any opening in the body, often through your mouth, nose or a wound. Some are transmitted straight into your skin or blood by animals such as fleas and ticks. Some diseases you may have heard of, or even had, are food poisoning, Lyme disease, and pneumonia. There are many more and a bacterial infection can occur anywhere in the body.

Enough about that, what about good bacteria?

Thankfully, way more bacteria are beneficial to humans than harmful. Many are decomposers that break down dead organisms and recycle nutrients that will make up the bodies of future living things. Some we have put to work in the making of tasty, nutritious food and alcoholic drinks.

It might be a surprise to learn that trillions of bacteria are living in your intestines. Don’t worry – these bacteria are not damaging your cells. Instead, they gain energy and nutrients from the same food you eat as it passes through your digestive tract. Most are helping you out by digesting plant matter, breaking down the lactose in dairy and synthesizing vitamins. These new found friends may also help protect your large intestine from an invasion of bad bacteria. In return, you are providing a nutrient rich environment for them without much effort on your part.

The bacteria that use the cells of other living (or once-living) things for energy are called heterotrophs. But many bacteria are also autotrophs – organisms that can make their own food. All plants are autotrophs as they use photosynthesis to combine carbon dioxide and water molecules into carbohydrates. In the process of photosynthesis, oxygen gas is released into the air. Many bacteria can do this too. In fact, ancient photosynthetic bacteria are responsible for the Great Oxidation Event, which is when the amount of free oxygen in Earth’s atmosphere greatly increased to the amount there is today (21%).

When did humans begin to learn about bacteria?

Humans have been affected positively and negatively by bacteria since the beginning of our species, but our knowledge of their existence only extends back to the 1600s. The first person to ever see a bacterium was the self-taught and unlikely scientist, Antoni van Leeuwenhoek (he was Dutch). Even though Antoni was a fabric merchant he developed an interest in making lenses. Likely inspired by news of the first microscope (made by Robert Hooke in England), Antoni made superb lenses for his own personally designed microscopes. They were the best and strongest microscopes at the time.

He observed bacteria and many other aquatic microscopic organisms that people had no clue even existed. When he told others about his findings they did not believe him at first. Eventually enough university professors took the time to look in pond water, as Antoni did, with their own microscopes and had to admit that Antoni was right!

Another 200 years had to go by before we began to realize that bacteria caused some of the diseases that plagued humankind for 1000s of years (including the actual plague). So many men and women have gotten us to where we are today in terms of preventing and treating bacterial diseases. However, in this short story, only two of the greats that got us started will be discussed.

Every student learns about the famous French chemist/biologist Louis Pasteur somewhere along the way. Pasteur was like Sherlock Holmes. He didn’t just accept the beliefs of the day about disease, he milkwanted proof and he investigated biological mysteries in the way a detective investigates a crime. Follow the evidence. For example, he put an end to the myth that microbes just spontaneously appear in foods and drinks. His experiments proved that the microbes were in the air and drifted into containers left open. Pasteur solved many other mysteries about microbes and along the way he developed several vaccinations. He also developed the earliest method for killing pathogens in food, a process we call pasteurization. Go check out a carton of milk or juice – it will likely say that the product is “pasteurized”.

Louis Pasteur can seem superhuman because of his incredible accomplishments. You might even assume that he feared nothing and did everything perfectly and never failed. Wrong! Pasteur was just as human as the rest of us. As a matter of fact, his homesickness was so strong that he left school to go back to his parents. Pasteur wasn’t the best test-taker either. He failed his graduate school entrance exams twice.

The German physician, Robert Koch, was also studying bacteria at the same time as Pasteur. Koch was younger and gained some of his knowledge by reading about Pasteur’s work. Koch (and his lab students) developed methods for making cultures of bacteria so he could identify those that caused diseases. For example, he discovered the bacteria that causes the terrible lung disease of tuberculosis, along with the bacteria that cause deadly anthrax and cholera.

Together, these two men founded the field of medical bacteriology. That is, understanding how bacteria cause disease so we can figure out how to prevent them. Unfortunately, the two men were not friends and did not get along. The story told is that their rivalry was in part due to a mistranslation of Pasteur’s French into Koch’s German language. Pasteur referred to Koch’s collection of work (on bacteria) in his speech, but the translator told Koch that Pasteur referred to Koch as being arrogant (due to the words sounding similar in French). Koch was not amused and apparently did not forgive and forget. Ever.

Koch and his lab technicians needed to solve the puzzle of figuring out a solid substancepetri dish on which bacteria would grow for long-term studies. The breakthrough came from Angelina Fanny Hesse. She recommended the substance agar-agar rather than gelatin because it remains solid at high temperatures (and turned out to be resistant to the feeding habits of most bacteria). It was on this new substance that Koch was able to isolate and identify the bacterium causing tuberculosis.

Is there more to know about bacteria?

We may seem to know quite a lot, and we do, but most species of bacteria have never been studied. Bacteria mutate quickly and become immune to our antibiotics. When we think we’ve got their number they mutate and fight back.

Humans figured out how to make bacteria work for us at least 10,000 years ago in the production of cheese. This is pretty interesting considering we didn’t know they existed! Today we are coming up with more ways to get bacteria to work for us. For example, we use some to produce the antibiotics that kill other bacteria by manipulating their DNA. We use them to break down the oil in an oil spill and we use them to produce genetically-modified plants.

We are just starting to understand how they positively affect our health. What are those trillions of cells in our guts doing for us and to us? There’s research into how they affect everything from our immune system to our emotions.

Nobody wants a bacterial infection and you may not want to think about them being in some of the food you eat, but denial won’t make them go away. Rather, get to know them, the good and the bad. cheeseYou can even make a career out of getting to know them. Bacteriologists are needed in many industries – food, biotech, cosmetics, pharmaceuticals, to name a few. Maybe you will invent a life-saving drug or a tastier cheese.

In 1928, scientists elected Alice Evans to be the president of the Society of American Bacteriologists for her extraordinary work in preventing disease. Born in 1881, she earned degrees in bacteriology and then worked for the U.S. Department of Agriculture. She used her education to prove that regular pasteurizing of milk prevents a serious bacterial disease called brucellosis. She even contracted and suffered from the disease herself.

Cup image source
bacteria image source

Teachers – Need a worksheet to go with this reading? arrow

bacteria webquest

Teaching Graphing to Middle Schoolers

graphing packet coverGraphing with Content Packet-

Graph, Analyze, Conclude!

Teaching graphing to middle school students can be tough. Where do you start? That was my question when I realized that my students had never made a graph before. 

Intervals, axes, titles? My smart, but skill-challenged students had no idea where to begin or even why to make a graph.

After struggling through my first attempts to teach graphing I decided to write it all out into self-guiding assignments that can be done in class and at home. 

I LOVE subject integration and HATE to waste time, so rather than having students graphing meaningless data devoid of any learning value, students get to learn about experimental design and bird behavior as they learn how to graph data. 

I created 5 mini-lessons/instructional worksheets that scaffold the skills of graphing and data analysis. 

Try lesson 1 for free!

Get all 5 levels here!

 

 

Pathogens

cover page pathogensEveryone loves to learn about pathogens – those icky microorganisms that can make us sick and have caused lots of notorious epidemics that both horrify and intrigue us today! Students learn the basics about pathogens and how we have learned to deal with them.

This packet includes 11 engaging, knowledge-building activities for students to learn about…

  1. The 5 types of pathogenic organisms – bacteria, viruses, fungi, protists and worms

    2. Some diseases caused by each type of pathogen

    3. Vectors and hosts

    4. Antigens and antibodies – and basic facts about the human immune response to pathogens,

    5. Vaccines, and

    6. Eight scientists who greatly contributed to our knowledge about pathogens and how to prevent and fight their infections.

STUDENT LINKS

Immune System WebQuest Links
Video Recommendations

About Bacteria:

About Immunity and Vaccinations:

RESEARCH LINKS FOR “THE REAL STORY BEHIND GERM THEORY”

Antony (or spelled Antonie) van Leeuwenhoek

https://explorable.com/discovery-of-bacteria

https://ucmp.berkeley.edu/history/leeuwenhoek.html

Edward Jenner

https://explorable.com/who-invented-vaccination

https://www.jenner.ac.uk/edward-jenner

Ignaz Semmelweis

https://explorable.com/semmelweis-germ-theory

http://broughttolife.sciencemuseum.org.uk/broughttolife/people/ignazsemmelweis

Dmitry Ivanovsky

https://upclosed.com/people/dmitri-ivanovsky/

https://en.wikipedia.org/wiki/History_of_virology

https://www.immunology.org/tobacco-plant-1935

John Snow

https://www.ph.ucla.edu/epi/snow/snowcricketarticle.html

http://broughttolife.sciencemuseum.org.uk/broughttolife/people/johnsnow

Louis Pasteur

https://explorable.com/discovery-of-pasteurization

https://www.sciencehistory.org/historical-profile/louis-pasteur

Joseph Lister

https://www.jenner.ac.uk/edward-jenner

https://www.famousscientists.org/joseph-lister/

Alexander Fleming

https://explorable.com/history-of-antibiotics

The real story behind penicillin

How the Eye Works Webquest

In this activity students will…eye wbqst picture

  • Learn the main parts of the eye and how they function
  • Have fun with an optical illusion
  • Learn about eye health and common vision problems
  • Compare human eye sight to other animals

Find more information about this activity here.

Student Links:

A. Movie: Eyes

B. Your Eyes Article

C. Diagram of the Eye

D.Experiments to Try

Experiments to Try

E. eye health

Pinkeye

Caring for Your Eyes

F. common vision problems

G. Eyes Quiz

H. Eagle Eyes

I. Animal Eyes