I use these blocks as part of a density lesson as well
Prior to this set, I used blocks of scrap wood that were cut in the wood shop, but any rectangular shape works well such as chalk boxes, expo boxes, staple boxes, tissue boxes, playing cards box, dice, etc…
Prior to having the students record the measurements for the blocks, we go over the importance of how to orient the blocks before measuring. A problem that students often run into is that they end up measuring one of the sides two times, and not measuring all three of the sides. Even though the right-hand rule is not used for volume, it helps to find the L, W, & H of each block.
In the image below, Z = Length, Y= Width, and X = Height. Mathematically, it doesn’t matter which side is designated as the width, height, or length since all three sides are multiplied, but this will help students measure all three sides properly. Students should place the block in their hand and align their fingers with the three sides of the block. Once they have decided on how to orientate the block, they can record their measurements.
For this lab, you can have several stations set up around the room with 1-3 blocks at each station. I assign each block a number and using a black sharpie, write it right on to the block itself. Not all blocks have to be measured, once each student has measured 10-15 blocks, they can go back to their seats and compare their measurements with a partner. We go over the answers together as a class once everyone is done.
This is a wonderful problem solving and hands-on activity to use as part of your density unit. The students enjoy the challenge and have a solid understanding of density after completing this activity. Even though students quickly figure out how to make the canister float and sink, making the canister suspend is pretty challenging and requires a lot of trial and error and problem solving.
To qualify as suspending, the film canister needs to float just under the surface of the water, with a small portion of the top just breaking through. How I also verify that it is suspending is by pushing the film canister to the bottom of the tank, if it comes up very slowly to the surface, it counts – if it comes up quickly or stays towards the bottom, it doesn’t count. Students then need to figure out that if it comes up too quickly, they need to add to the mass, if it comes up too slowly, they need to remove some of the mass. It will take several tries to get it just right.
one canister per 2 people works well, they can reuse the canisters if you don’t have enough to give each set of lab partners 3 canisters
if they reuse the canisters, be sure that they find the mass before they empty the contents
An assortment of small objects such as pennies, paper clips, stoppers, small pebbles, etc…
Introduce the Dunkin’ for Density Challenge – their goal is to make the film canister float, suspend, and sink by placing contents inside of the film canister.
Many students will say that the canister will float with nothing in it, but they must place a few objects in it for it to count 😉
On a side note, a mini history lesson on film and cameras is fun to discuss since most students have never used a camera that used film
Explain the procedures, review how to use the TBB, note that the film canister must seal completely and be air tight so that water doesn’t enter, and also demonstrate how to use the dunk tank properly and to dry off the canister before finding the mass.
Do not give the students the value for the volume of the film canisters until they have collected their data. If the students know the volume of the film canister, they may figure out the mass needed to make the film canister’s density close to 1.0 g/cm3.
The value is approximately 39 mL or 39 g/cm3 – verify with a large graduated cylinder that the film canister can fit inside of – or use an overflow can to find the volume (link).
I will give the volume to each set of lab partners individually and ask that they don’t share that information with the class.
Once students have calculated the density, collect class data on a spreadsheet projected on the board/screen.
Discuss results – why did the film canister float, suspend, or sink in the tank of water? What relationships did you notice?
For more lessons related to the Properties of Matter, click here (link)
Optional – privacy screen made of one manila folder cut in half and stapled together
View my Properties of Matter resources for related lessons (page)
This is a fun partner activity that I use as part of my Chemistry unit to get students thinking about the differences between physical and chemical changes. Each pair of students is given a set of cards with images and descriptions of either a physical change or a chemical change. (see photo above)
Each pair goes through the cards and discusses/decides where the each card will be placed. Once they have categorized the cards, students call me over verify their work – I will either say “Yes, they are all in the correct category!” or “Not quite yet, try again.” I give a small clue each time I come over. For example, I will say something along the lines of “You have 2 in the incorrect column” or “You have too many in the Physical Change category, which ones should be moved to the Chemical Change category?” or “Two cards need to be flip/flopped to the other category, all the other cards have been placed correctly” or “All of the cards that are placed in the Chemical Change group belong there, but not all of them are there quite yet, what else can you move to that category?” – I won’t tell them the specifics of what needs to be changed. This forces the students to re-evaluate their choices and make changes as needed until all of their cards in the correct category.
Every few minutes, I will give the whole class a clue. This allows them to check their progress and verify one answer at a time. One card that many students have difficulty with is the boiling water card – and that is usually the first clue I will give out once I have had a chance to check every group’s progress. Each pair of students continues working together until all the cards are placed in the correct category. Once I’ve verified their placements, they add the answers to their notes and answer the questions for the activity and we discuss our results.
I like to use the Minerals in Your House page to introduce minerals to my students and have them explore the different ways we use minerals in our everyday life. In this post I am including an updated worksheet for students to take notes while they view the website.
This classic interactive website is a great way to practice identifying acidic, basic, and neutral substances along with reading pH values. There are three different levels which increase in difficulty as the students complete each activity.
Challenge 1 – students have to identify and categorize the different ‘juices’ that they will serve to the aliens as either Acids, Bases, or Neutral.
Challenge 2 – students will practice serving requested juices to aliens, but if they serve a juice from the wrong category, aliens can become sick, or worse!
Challenge 3 – students have to change the pH values of the juices on the tray by either adding acids or bases to raise or lower the pH values.
I have a handout with instructions for the students to record their progress (worksheet)
Please note that the updated link is located at: (updated 3/4/18)
Above is a photo of a 4-door foldable for the three density related formulas: D= M/V, V= M/D, and M = VxD. The 4th door has step by step instructions on how to solve a word problem. Along with the formulas, inside the foldable are 3 practice problems, and a few notes about mass, volume, and density.
On the right side of the notebook are practice problems. Students have to determine which formula is needed, set up the problem, solve, and add the correct units. They can refer to their foldable for the formula and how to solve the problems. I have the students close the flaps for the known values. For example, if the problem states the Density and Volume values, they close those doors on the foldable leaving the Mass flap open, since it is the missing value. That is formula they will then use to set up the problem correctly and solve.
My main goal for this lesson is having the students choose the right formula, set up the formula by plugging in the known values (this is a step that the kids don’t feel the need to do/show as part of their work), and adding the correct units when done. Some students may have a little difficulty with multiplying or dividing decimals and rounding to the 100ths place, so I usually go over that before we begin by modeling a few problems with them.