Emergency Sub Plans for Middle School Chemistry: Ready-to-Use Chemical Science Lessons
Every science teacher eventually needs an emergency sub plan.
Sometimes the absence is planned. Sometimes it is not. A practical lesson that was supposed to happen suddenly cannot go ahead, a piece of equipment is unavailable, or you simply need something that another teacher can pick up with very little preparation.
Chemistry creates an additional challenge because so much of what makes the subject memorable involves practical work. Reactions, heating, glassware, chemicals and demonstrations can be excellent teaching when the regular teacher is present, but they are not always the right choice for emergency cover.
That makes middle school chemistry a particularly good subject for having a collection of well-designed, non-practical emergency lessons ready in advance. Reading passages, data interpretation, diagrams, vocabulary tasks, anchor charts, structured research projects and critical-thinking activities can all keep students doing genuine chemistry without requiring a substitute teacher to run an unfamiliar laboratory activity.
The aim is not to replace practical science. Chemistry is a laboratory science, and the American Chemical Society recommends meaningful laboratory experiences alongside careful safety planning. The point is simply that your emergency folder should contain lessons that remain useful when a laboratory investigation is not appropriate.
What makes a good emergency chemistry sub plan?
A useful emergency chemistry lesson should pass one simple test:
Could a substitute teacher give students the materials and get them started without having to teach the entire chemistry concept first?
That does not mean the resource needs to be extremely easy. It means the explanations, instructions and student tasks need to be self-contained.
A good lesson might begin with a short introduction, move into a science reading passage, ask students to answer comprehension and application questions, and finish with a short task that requires them to explain or apply the chemistry.
That structure works particularly well in middle school because students can work independently but still benefit from clear scaffolding.
The best emergency resources also have a clear stopping point. A substitute teacher should know what students are expected to complete during the period, what to collect or submit, and what to do if a few students finish early.
That is one reason reading passages work so well for emergency cover. They provide the science content, the questions provide an obvious task, and a final critical-thinking prompt can move students beyond simple recall.
A resource such as the Complete Chemistry Reading Comprehension Passages and Questions gives teachers a broad bank of chemistry topics, including the periodic table, acids and bases, metals, states of matter, bonding, catalysts, chemical reactions, electrolysis, precipitation, the mole, Bunsen burners, bioplastics and green chemistry. The collection also includes differentiated dual passages on bioplastics and green chemistry.
Why chemistry needs a slightly different kind of sub plan
In biology or astronomy, you can often hand a student a reading passage and have them work independently with relatively few concerns beyond the academic task.
Chemistry requires another layer of judgment because practical activities may involve hazards associated with chemicals, heat, equipment or procedures. The ACS recommends that teachers recognize hazards, assess and minimize risks, and prepare for emergencies, using the RAMP framework. It also emphasizes that laboratory safety requires appropriate facilities, equipment, supervision and risk management.
For that reason, an emergency sub lesson should generally lean toward conceptual and literacy-based chemistry unless you already have a very clear, school-approved procedure for practical work and know that the substitute teacher is appropriately prepared to supervise it.
That does not mean your substitute plans have to be dull.
Some of the best emergency chemistry lessons can be built around questions such as:
Why do some metals react more strongly than others?
What actually makes an acid acidic?
Why do catalysts matter?
Why can two substances made from the same types of atoms have completely different properties?
How can chemistry help reduce waste?
These questions can lead to substantial science learning without requiring a single chemical to be poured into another.
Build a simple 45 to 60 minute emergency chemistry lesson
A dependable middle school chemistry sub lesson can follow a straightforward rhythm.
Spend the first five minutes introducing the topic and explaining the task. Give students a short science article or reading passage for the next fifteen to twenty minutes. Follow this with comprehension questions, vocabulary and perhaps a small data interpretation task.
Use the final ten to fifteen minutes for a question that requires students to explain, compare, predict or justify something.
That final section is worth protecting.
It is easy for emergency lessons to become "read this and answer the questions." That is better than having no lesson at all, but it misses an opportunity to get students thinking chemically.
For example, after reading about catalysts, students might explain why catalysts can make an industrial process more efficient without being used up in the same way as the reactants.
After learning about acids and bases, they might explain why pH is useful but does not tell the whole story about a substance.
After studying bonding, they might compare ionic and covalent substances and explain how differences in bonding relate to their properties.
After reading about green chemistry, they might identify a chemical process that could be redesigned to reduce waste or energy use.
The substitute teacher does not need to deliver a lecture first. The resource provides the background, while the student task provides the thinking.
Use short chemistry reading passages for quick cover lessons
For a 30 to 45 minute emergency lesson, a single chemistry reading passage with questions can be almost ideal.
The current chemistry collection contains individual topics covering everything from acids and bases and states of matter to redox reactions, catalysts, precipitation, specific heat capacity and the noble gases. The store also offers a dedicated chemistry dual-reading collection, including topics such as elements, mixtures and compounds, pH, ionic and covalent bonding and sustainable chemistry. You can find the link here - Chemistry Dual Reading Passages.
This kind of resource is particularly useful when you do not know exactly how long the substitute lesson will need to last. Students can read the main passage, answer the questions and then move into an extension question or written explanation.
You can also use the same passage when you are present. It can become a normal science literacy task, homework, a starter activity, a review lesson or a way of introducing a new idea before a practical.
That means you are not building an emergency folder full of material that only becomes useful when something goes wrong.
Free chemistry resources can do a lot of the work
An emergency resource folder does not need to be expensive.
For example, the free Acid Rain Chemistry Science Reading Comprehension resource provides teacher and student versions of a self-contained chemistry reading task. The resource is explicitly described as useful for substitute teaching, scientific literacy, weekly reading, lesson filler and extension.
Acid rain is also a useful emergency topic because it crosses chemistry and Earth science. Students can explore acids, pollutants, atmospheric chemistry and environmental effects in a lesson that remains academically focused without requiring a practical.
A resource like this is particularly handy for the "I need something for tomorrow" situation. You can print it, share it digitally and leave clear instructions without having to build a lesson from scratch.
The wider Free Resources section is also worth checking when building an emergency folder because it gives you a way to expand your bank of ready-to-use materials without buying every resource individually.
Chemistry anchor charts are useful after the reading
A reading passage gives students information. An anchor chart or graphic organizer can help them do something with that information.
This is particularly useful in chemistry because students often encounter several layers of vocabulary and concepts at once. Consider a unit involving atoms, elements, compounds, mixtures and bonding. Students can know the definitions individually and still struggle to understand how the ideas relate to one another.
An organizer can help.
Students might create a structure linking atoms, elements, compounds and mixtures. They might compare ionic and covalent bonding. They might organise the steps involved in a chemical reaction. They might identify the causes and effects of acid rain or sort examples of physical and chemical changes.
The Science Reading Anchor Charts: Graphic Organizer, Main Idea and Key Details can be paired with chemistry reading passages in exactly this way.
The important thing is that the anchor chart should have a purpose. It should help students organise scientific thinking rather than simply provide another page to fill in.
A substitute teacher can say, "Read the article, answer the questions, then use the organizer to show the three most important ideas and how they connect." That creates a clear sequence without requiring specialist chemistry instruction.
Use data instead of practicals when appropriate
One of the biggest missed opportunities in emergency chemistry lessons is failing to use data.
Students do not always need to conduct the experiment themselves to think scientifically about an experiment.
You can provide a table showing temperature changes during an exothermic or endothermic reaction. Students can identify patterns, calculate changes and explain what the data suggest.
You can provide pH values and ask students to classify substances and identify patterns.
You can provide reaction results and ask students to determine which combinations produced a precipitate.
You can give students information about reaction rates and ask them to explain how changing temperature or concentration might affect the process.
This lets students practise scientific reasoning while avoiding the setup and safety demands of a practical lesson.
It also makes an emergency lesson more rigorous than a simple comprehension worksheet.
Bunsen burners can be taught without lighting one
A Bunsen burner is a particularly good example of how a chemistry topic can be separated into conceptual learning and practical work.
You may want students to understand the parts of a Bunsen burner, combustion, the fire triangle, flame types and laboratory safety. Those ideas do not necessarily require students to light a burner during an emergency lesson.
The Bunsen Burners Chemistry Research Project Template provides a structured alternative. It includes student and teacher versions and a 20-point rubric, and the product is designed for uses including substitute teaching, extension and independent science literacy work.
Students can therefore learn about the equipment and the chemistry surrounding combustion without turning an emergency cover lesson into an improvised laboratory practical.
That can then lead neatly into the real practical when the regular teacher returns.
Research projects work particularly well for longer absences
Not every emergency lasts one lesson.
Sometimes you know that you will be away for several days, or you simply want something that can absorb a class for a longer period without becoming repetitive.
A structured research project can work very well here.
The key word is structured.
"Research green chemistry" is too vague for many middle school students. "Write a paragraph explaining the topic, make one mathematical connection, explain an engineering or technology connection, define five key terms and answer several inquiry questions" gives them a route through the task.
The Bioplastics and Green Chemistry Research Project Template provides exactly this sort of framework. It includes a summary, mathematics connection, engineering or technology connection, glossary, inquiry questions, a rubric and an HTML information resource to help students get started.
There is also a particularly useful combined option in the Bioplastics & Green Chemistry Dual Passages + Research Project Template Set. It combines differentiated reading passages with the longer research task, making it possible to move from reading comprehension into independent inquiry while keeping the topic consistent.
That is a useful pattern for emergency planning:
learn the chemistry, organise the chemistry, research the chemistry.
A 60 minute lesson can become a two-lesson sequence
A well-designed emergency chemistry resource does not need to stop after one lesson.
Imagine students are studying green chemistry.
During lesson one, students read the introductory passage, learn the key vocabulary and answer questions about what green chemistry is and why it matters.
The second lesson can then use the research project template. Students might investigate a particular application, explore how a chemical process could be made more sustainable, find relevant data and explain an engineering connection.
The same model could work with catalysts, the periodic table, acids and bases, bonding, chemical reactions or electrolysis.
This is particularly useful if your absence unexpectedly extends. You do not have to find a completely new lesson. Students can continue working within the same topic.
The Chemistry Reading Comprehension collection is useful for building this kind of progression because it contains a large number of topics that can stand alone or be combined with longer work.
The 30 to 45 minute "quick cover" lesson
Sometimes you need something very simple.
A short emergency lesson can be based on one reading passage, a handful of questions and one final written response.
For example, give students a passage about catalysts. They read it independently, answer the comprehension questions and finish by explaining why catalysts can be important in industry.
The current Catalysts Chemistry Science Reading Passage is specifically presented as a grab-and-go resource and is intended for uses including substitute teaching, extension, scientific literacy, weekly reading and lesson filler. It includes teacher and student versions.
This is the kind of resource that earns its place in an emergency folder because the lesson does not depend on the normal teacher being there.
The 45 to 60 minute standard lesson
For a slightly longer lesson, add a processing task.
Students might read about precipitates, answer the questions and then analyse a few example reactions.
The Precipitates & Precipitation Science Reading Comprehension resource is a useful example of a topic that can be taught through reading and scientific reasoning rather than requiring students to mix chemicals during emergency cover. The resource includes teacher and student versions and is designed for substitute teaching, extension and lesson filler.
After the reading task, you could give students an invented dataset showing which combinations produced precipitates. They can identify patterns and explain their reasoning.
This gives students something much closer to genuine scientific analysis.
The extended emergency lesson
For a longer lesson, move from reading to research.
A useful extended chemistry lesson might begin with an article or primer, continue with the research template, and finish with a written explanation or short presentation.
Bioplastics and green chemistry are particularly useful for this because the chemistry connects naturally with materials, manufacturing, waste and environmental questions. The dual-passage resource also provides differentiated reading, which is useful for mixed-ability classes.
You could also allow students to choose from several related research topics. A student who is interested in materials might investigate bioplastics, while another student might explore catalysts, electrolysis or smart materials.
This makes the emergency lesson feel less like an emergency.
Differentiation matters when the regular teacher is absent
A substitute teacher may not know which students normally need additional support.
That means built-in differentiation is particularly valuable.
One of the simplest approaches is to give students two versions of the same reading. They can study the same general chemistry topic, but with different levels of reading complexity.
The chemistry store currently includes a dedicated Enhanced Differentiation Chemistry Reading Comprehension collection containing 42 passages across 35 topics, including separate reading options for topics such as elements, mixtures and compounds, pH, polar and non-polar bonds, and ionic and covalent bonds.
Another approach is to keep the reading identical but alter the final question. Some students can explain the key idea, while more advanced students analyse evidence, make a mathematical connection or evaluate an application.
Research templates can also handle this well. The bioplastics and green chemistry research project, for example, includes alternative inquiry questions for younger learners and more advanced students.
The benefit is that the substitute teacher does not need to design the differentiation in real time. The resource already provides the structure.
Do not let chemistry emergency lessons become safety lessons only
There is a natural temptation, when avoiding practical work, to give students a generic laboratory safety worksheet.
There is nothing wrong with teaching safety, especially when it is connected to actual chemistry. But an emergency lesson can still teach chemistry alongside safety.
A Bunsen burner research task can teach combustion.
An acid rain lesson can teach acids, atmospheric chemistry and environmental effects.
A catalysts lesson can teach reaction rates and industrial chemistry.
A green chemistry lesson can teach students how chemists think about waste, efficiency and environmental impact.
The science should remain the centre of the lesson.
What about practical work?
A practical should still have an important place in chemistry teaching. The ACS describes laboratory experience as integral to middle and high school chemistry and emphasizes that meaningful hands-on investigation should be part of chemistry education.
The emergency sub plan simply gives you another option.
Rather than asking an unfamiliar substitute teacher to improvise a chemical demonstration, you can have students analyse a completed experiment, interpret results, study the scientific principles behind it or prepare for the practical that will happen when you return.
For example, students could analyse data from an exothermic reaction rather than carrying it out. They could interpret a titration dataset rather than performing a titration. They could examine a diagram of electrolysis and explain what is happening at each electrode.
This can even improve the eventual practical because students arrive with more conceptual understanding.
Upper elementary chemical science
The same approach can be adapted for upper elementary students, but the reading and chemistry should be more accessible.
Focus on ideas such as states of matter, changes of state, mixtures, materials and simple physical versus chemical changes.
A short passage could introduce evaporation, for example, followed by a simple organizer showing what happens when a substance changes state. Students could then explain where they encounter evaporation in everyday life.
You can also use chemistry vocabulary in a structured way without expecting young students to manage a large amount of specialist terminology.
The principle is the same as in middle school: give students enough information and structure to work independently, then ask them to use the science rather than simply copy definitions.
High school chemistry
At high school level, you can reduce the scaffolding and increase the complexity.
A chemistry reading passage can lead into quantitative analysis, evaluation of evidence, research or a more demanding Claim-Evidence-Reasoning response.
Students might investigate reaction rates, chemical equilibrium, electrolysis, redox chemistry, bonding, organic chemistry or green chemistry. They can be asked to interpret graphs, use calculations, compare models, evaluate a technology or explain why an industrial process is designed in a particular way.
The chemistry resource library is broad enough to support that progression. The current chemistry subscription, for example, combines reading passages, research project templates, critical-thinking frameworks, hexagonal thinking activities, games and other chemistry tasks across topics including bonding, redox reactions, states of matter, catalysts, organic chemistry and the periodic table.
For teachers who regularly need ready-to-use chemistry material rather than occasional emergency resources, the Monthly Chemistry / Chemical Science Resources subscription provides five chemistry resources each month.
That broader library can make emergency planning much easier because you are gradually building a bank of material you can use for normal teaching as well as unexpected absences.
Build an emergency chemistry folder before you need it
The best time to create emergency sub plans is not the morning you are sick.
Build the folder gradually.
Start with five dependable topics. Perhaps choose one from atomic structure, one from reactions, one from acids and bases, one from materials or green chemistry, and one from a wider application of chemistry.
For each topic, keep the student material, teacher answers and a short substitute instruction page together.
A simple instruction page might say that the lesson lasts approximately 50 minutes, students should complete the reading and questions, early finishers should complete the extension prompt, and completed work should be submitted digitally or placed in a particular tray.
The substitute should not need to work out the structure.
It is also worth keeping printable and digital versions available when possible. Some schools are very paper-based. Others expect students to work online. Having both options makes your emergency plan much more flexible.
Give every lesson a meaningful final question
The final ten minutes of an emergency lesson are often where the difference between a worksheet and a good science lesson becomes most obvious.
Ask students to explain something.
After a lesson on acids and bases, ask them why pH is useful.
After a lesson on chemical bonding, ask them how bonding can affect properties.
After a lesson on catalysts, ask why industry cares about reaction efficiency.
After a lesson on green chemistry, ask what changes could make a chemical process more sustainable.
After a lesson on the periodic table, ask why arranging elements by their properties is useful rather than simply asking students to reproduce the table.
The response can be a short paragraph, an annotated diagram, a CER response or a completed graphic organizer.
The important thing is that students leave the lesson having used chemistry.
A reliable emergency chemistry system
A very practical way to organise your emergency resources is to think in three levels.
Your quick cover lesson is a single reading passage with questions and a final written response. This gives you a dependable 30 to 45 minute option.
Your standard cover lesson adds an anchor chart, data-analysis task or second activity and can comfortably fill approximately 45 to 60 minutes.
Your extended cover lesson moves into a research project, allowing students to work independently across one or several lessons.
The same topic can sometimes provide all three.
The bioplastics and green chemistry materials are a particularly good example. Students can read the differentiated passages during a shorter lesson, use an organizer to process the information during a standard lesson, and then continue into the research project if more time is available.
This is much easier to manage than having a completely different emergency lesson for every possible timetable problem.
Your emergency sub plan should still feel like chemistry
The real goal is not to keep students quiet until the bell.
It is to give them worthwhile chemistry.
A student reading about catalysts, analysing precipitation data, exploring acid rain, investigating green chemistry or researching the Bunsen burner is still learning chemistry even when the regular teacher is absent.
That is why reading passages, anchor charts, research templates and structured independent activities make such useful additions to a middle school chemistry emergency folder.
The reading provides the scientific content.
The questions make students process it.
The organizer helps them structure their understanding.
The research template gives them somewhere to go next.
The final explanation shows whether they can actually use the chemistry.
The Chemistry section of The Teaching Astrophysicist provides resources across these different formats, including reading comprehension passages, differentiated readings, research projects and other chemistry activities.
And because many of these resources also work perfectly well in ordinary science lessons, you are not creating a folder full of disposable backup worksheets. A chemistry reading passage can introduce a unit. A research project can become an extension task. An anchor chart can support a practical lesson. A free resource such as Acid Rain can provide a useful lesson when you simply need something ready to go.
That is ultimately what makes a good emergency sub plan worth having.
It should not feel like a lesson created because the regular teacher is absent. It should feel like a lesson you would have been happy to teach yourself.
Thanks for reading
Cheers and stay curious
Oliver - The Teaching Astrophysicist
