Water properties states of water adhesion and cohesion surface tension capillary action the states of water water has three states. Structure and properties university of pennsylvania. It means the atoms of the water molecule do not share electrons equally. Once the water has reached the edge, you begin to see a bubble or dome of water forming on top of the cup. Cohesion is the ability of water molecules to stick to themselves hbonds. The chemical formula of a molecule of water is h2o. It makes up 5095% of the weight of living organisms. Fourth grade lesson properties of water betterlesson. You will then be able to determine the number of water molecules associated with an unknown hydrated compound. Water thermophysical properties engineering toolbox.
In these teacher guidelines, we provide teachers with a selection of two examples of experiments on water that can be included in a lesson plan in combination with the video. The hydrogen atoms are attached to one side of the oxygen atom, resulting in a water molecule having. Jessica svoboda, modified from jennifer giannou objective warm up reminders key concepts investigate the properties of water draw a food chain with 3 trophic levels and label the secondary consumer, heterotrophs and autotrophs see critical thinking. This lab will look at the way that water sticks to itself to make a rounded shape. Almost all matter on earth exists in three different states.
Review any relevant conceptsvocabulary from previous investigations. The water molecule results to be charged negatively near the atom. We need water for almost everything, for example drinking, bathing, cooking etc and therefore we should know about the properties of water. However, there isno doubt that water has the largest collection ofanomalous properties ofany common substance.
The properties of water make it suitable for organisms to survive in during differing weather conditions. I like to end things with a positive attitude so here is a picture of cute puppies riding a jetski. We discuss the definition for each term and add the terms to our pocket chart containing the vocabulary words for the unit. An investigation of the liquid that makes all life possible. This experiment is carried out by using marcet boiler. The station lab is a plug and play unit that is meant to accompany my free kesler science station lab series. Complete the worksheet written or print and submit it with your recorded observations at the end of the lab. Liquid water properties at various temperature and pressure liquid water properties at temperatures between melting point and boiling point and pressures of 14. Introduction when ionic compounds are prepared in water solution and then isolated as solids, the crystals. In particular you will be experimenting with the new concepts of. Surface tension is a property of water created by cohesion that enables a drop of water to keep its shape.
Water has special properties that make it unusual and complex. Johnson research foundation, university of pennsylvania, philadelphia, pennsylvania, usa water is a major component of all living things. Properties of water lab water s chemical formula is h 2 o. They are intended to introduce you to several ideas important to aspects of the experiment. The purpose of this lab is to determine the effect of the different substances on the properties of water. Triple beam balance lab pdf students will find the masses for a variety of objects. How many drops of water do you think will fit on the head of a penny. The following preparatory questions should be answered before coming to class. It is anomalous in many of its physical and chemical properties. It is also one of the simplest yet most important molecules in living systems.
Make a hypothesis of how many tries it will take to float a paper clip on top of the water. These states of matter have very different properties, or ways they behave and appear. Try using different types of potatoes russet, yukon, sweet or fruits apple, pear in part 1c. Hardness is a natural characteristic of water which can enhance its palatability and consumer acceptability for drinking. Pdf lab report thermodynamic marcet boiler muhamad. Water covers about 70% of earths surface and it makes up 6575% of our bodies 82% of our blood is water. A look at three important properties of water its high heat capacity, its high heat of vaporization, and its cohesiveness and adhesiveness. The cohesion and surface tension of water becomes apparent when the drops of water you add reach the edge. Summarize in point form the unique properties of water. It is in the air we breathe, the sinks we use and in every cell of the body. The hydrogen atoms are connected to the oxygen atom through covalent bonds.
Tell them to keep in mind the importance of water in biological systems and to think about what the properties they will be investigating will mean to living systems and how it relates to the quality and protection of our drinking water. Predict how many drops of water will fit on the surface of a penny before. This is why it is used in cooling systems for instance in car radiators or to cool industrial equipment. Water has some peculiar properties, but because it is the most common liquid on earth, we typically do not recognize how truly peculiar water really is.
The cytoplasm of a cell is a water based solution continue reading properties of water labs. Using the molecular models provided for you by your instructor, sketch, color, and label a spacefilling model of water in the space provided. Water is a liquid at normal physiological or body temperatures. Bottles of stuff students will estimate, rank, and measure the masses of bottles filled with a variety of items blog entry density of water lab pdf students will determine the density of water using a graduated cylinder and a triple beam balance.
Below freezing water is a solid ice or snowflakes, between freezing and boiling water is a liquid, and above its boiling point water is a gas. Although these properties are familiar because of the omnipresence of water, most of the physical properties of water are quite atypical. Dissolved oxygen analysis measured the amount of oxygen dissolved in an aqueous solution. Cohesion is the ability of water molecules to stick to themselves h bonds. There are words scientists use to describe water continue reading water properties notes. How many hydrogen atoms are in a molecule of water.
Ap biology lab manual for teachers supplement ideas for introducing inquiry interesting modifications to this lab can open it up to inquiry. Given the low molar mass of its constituent molecules, water has unusually large values of viscosity, surface tension, heat of vaporization, and entropy of vaporization. The hydrogen atoms are attached to one side of the oxygen atom, resulting in a water molecule having a positive charge on the side where the. Some are essential for life while others have profound effects on. Bonding and properties of water prelaboratory questions 1. Why is water the only substance that naturally exists as a solid, liquid, and a gas on earth. Youll probably be surprised by the number of drops you get on there.
Explain how these properties of water are related to the phenomena described in parts a h below. It makes up from 50 to 95 percent of the weight of living organisms. What would be an example of water being a great temperature moderator. Water has a high heat of vaporization energy needed to evaporate. Dissolved oxygen is the amount of gaseous oxygen dissolved in water. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Properties of water station lab students will love you for providing them with a handson experience when learning about water and its properties. First of all you must know this competition takes patience and a steady hand. As the diagram to the left shows, that is one atom of oxygen bonded to two atoms of hydrogen. To conclude the lab, i ask students to do two separate activities. As a result of waters bent shape and polarity, water has unique properties, such. Water contains half as many hydrogen atoms as oxygen atoms.
Water is a liquid at standard temperature and pressure 25 degrees celsius and 1 atm, for liquids. In this portion of the lab, you will test these three properties and apply them to the concept of capillary action. The students then are given five lab days to separate and identify finding physical and chemical properties, and then approx. You must turnin your work to your instructor before you will be allowed to begin the experiment. This worksheet will help prepare you for participating in the properties of water lab investigation part 2. During the winter when lakes begin to freeze, the surface of the water freezes and then moves down toward deeper water. In the united states, cows milk is produced on an industrial scale and is the most commonly consumed form of milk.
Water s molecular structure and hydrogen bonding 1. Their overall purpose is to give the students handson opportunities to experience some of the properties of water. Oxygen is more able to keep them close to it than hydrogen. It makes up about 34ths of the surface of the earth. Characteristics of living things notes presentation. Ice freezes as it expands, which explains why ice is able to float on liquid water. I then define for students two of the special properties of water that are responsible for the action of the water on the penny in the lab. Teaching notes and tips this activity can take a variety of paths to get to the end, as long as it connects all of the dots physical and chemical properties. The atom electrons particles with a negative charge establish links between themselves. Properties of water rotation lab loudoun county public. Water is made up of atoms bonded to form molecules.
Properties of water lab calculating density of water lab potato density lab buoyancy and salinity submarine lab ocean pressure. Water is an unique molecule that is essential for life on earth. The science of water lab activities are setup as lab stations. Humans, especially children, often consume the milk of other mammals as a part of their diet. Water is transparent in the visible part of the electromagnetic spectrum. Students use the data collected in their data table to discuss which side of the penny held more water, the effects of soap and salt on the water, and to make a guess as to why this happened. Milk is made mostly of water, but it also contains vitamins, minerals, fats. Properties of water driving questions explore the properties of water and use the molecular structure of water to explain these properties. A glance of earth taken from space will depict it blue in color. Safety precautions none are needed, since this is a paper and pencil activity. Anything that we can touch, feel, or see is an example of matter. Properties of water lab waters chemical formula is h 2 o.
Glass of water, paperclip, penny, soda straw, glass slide, glass test tube, a strip of jeans, paper strip with a marker dot, wax paper. Properties of hydrates in this experiment, you will study and observe the properties of hydrated compounds. Because of their varying natural sugar concentrations, the water potential will be very different. View lab report bonding and properties of water report. The hydrogen bonding that occurs between molecules in water results in much higher melting and boiling points as well as much lower vapor pressure. The structure and properties of water introduction to chemistry. Water is made of two hydrogen atoms and one oxygen atom.
Physical properties of matter what are the identities of the unknown substances. Properties of water lab 2012 modified from a lab by david knuffke, deer park hs page 2 of 8 activity 1a. One side of the water molecule has a positive charge, while the other side has a negative charge. Introduction matter, the stuff of which the universe is composed, is all around us. This blue color is actually water, the major part of the earth is covered with water.
Data table lab worksheet for recording trends procedures data table 1 shows the physical properties of a variety of substances. Even if water might seem boring to youno color, taste, or smellit has amazing properties that make it necessary for supporting life. First, i ask students to use the data table on the back side of their lab sheet to draw conclusions about the lab they conducted. Pdf che485 lab report on basic water properties i 2017. Matter can be defined as something that has mass and takes up space. Using a dropper slowly drop water onto a penny counting each drop. Physical, chemical and biological characteristics of water 3. The purpose of the experiment is to determine the dissolved oxygen do level in the lake. Pdf physical, chemical and biological characteristics of. Fill the micropycnometer to the top with distilled water using the distilled water bottle. The purpose of this lab is to investigate the property of the surface tension of water.