4/6/2024 0 Comments Density of water formula(Some people use the phrarse “dumb love” or even “dense love” but I think “dearly beloved” is a little nicer, even if a bit archaic sounding.).įirst, write down the density formula using only the first letter of the three words. It’s an old mnemonic, but it works! Students can remember the formula by thinking of the phrase “dearly beloved”. Trick for Remembering the Density Formula Now compare the list of actual densities to their list of estimates before the activity. Now use the density formula of mass divided by volume to determine the density of each of your objects. Liquid volume of milliliters (ml) can be converted to solid volume of cubic centimeters (cc). However, it does give an estimate of the volume. The fact that some water will stick to the sides of the cup makes this less accurate than if you had an official water displacement cup. Measure the volume of water in the cup.It will displace the volume of the object so that the same volume of water spills out of the hole and into the measuring cup. Place the cup inside a measuring cup that has metric measurements (usually milliliters).Puncture a hole in a disposable or Styrofoam cup.But in the very likely case you do not have one, here is how to make one: It would be great if you happened to have a water displacement measurer. The best way is to use water displacement. You may be able to measure by dropping the object into a beaker or cylinder and determining how much the volume in the container increases by milileters. Let them try to figure out how they might measure volume of irregularly shaped items. For instance, when measuring the density of pennies, it helps to get the mass and volume of four or five pennies rather than just one, unless you have a scientific scale with precision for tenths of grams. If you do not have an accurate enough scale, you may need to measure a number of items. You do want to use metric so convert to grams. If you don't have a scientific scale, you can use a small scale like a postal or diet scale to measure weight. Mass is determined by a scientific scale. Write it down, so they can compare it later. Have them guess while handling the objects. Let them make a list of the items: from most to least dense. Try to get five to eight different items to work with. These objects could include:īasically, any items that will fit in a cup and do not dissolve in water will work. First, give them a set of relatively small objects with various densities. Students benefit from practice using density. Hands On Learning With the Density Formula Your mass would be the same on the moon or on earth whereas your weight would be different. Mass stays the same and is not afected by gravity. Review the difference between mass and weight. So what two things do we need to determine density? The formula is listed above: mass divided by volume. Give the student time to think about and compose the answer to this question.Įxplain that chemists use the density formula to compare the mass of objects. Then ask: "How can we compare the mass of these two objects of different sizes?" Then ask which would have greater mass if they both were the same size. Then you might use a large bouncing ball or plastic dinner plate as the larger item with less density.Īsk the students which item has greater mass. The large item should have less density by greater weight because of its size.įor instance, you could have a small rock, gold ring, or quarter for the little object with greater density. Have a large object and a small object on hand to show the student(s). Find more information on MatchCard Science below. This is MatchCard #10 of the Chemistry Unit Study. Here's Your Copy of the Density Formula MatchCard Learn a mnemonic for the density formula. Calculate the density of the objects using a scale and water displacement. Projects: Given a set of irregular objects, students arrange them by their estimates of most to least dense. MatchCard Information Pieces are used to create the density formula (mass divided by volume) and identify which objects have greater density. Classical Childrens Books Find A Book Your Child Will Love
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