# How Matter Changes By Cindy Grigg

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How Matter Changes By Cindy GriggChanges in matter happen around you every day. Some changes make matter look different.Other changes make one kind of matter become another kind of matter.When you scrunch a sheet of paper up into a ball, it is still paper. It only changed shape. Youcan cut a large, rectangular piece of paper into many small triangles. It changed shape andsize, but it is still paper. These kinds of changes are called physical changes.Physical changes are changes in the way matter looks. Changes in size and shape, like thechanges in the cut pieces of paper, are physical changes. Physical changes are changes in thesize, shape, state, or appearance of matter.Another kind of physical change happens when matter changes from one state to anotherstate. When water freezes and makes ice, it is still water. It has only changed its state ofmatter from a liquid to a solid. It has changed its appearance and shape, but it is still water.You can change the ice back into water by letting it melt. Matter looks different when itchanges states, but it stays the same kind of matter.Solids like ice can change into liquids. Heat speeds up the moving particles in ice. Theparticles move apart. Heat melts ice and changes it to liquid water. Metals can be changedfrom a solid to a liquid state also. Metals must be heated to a high temperature to melt.Melting is changing from a solid state to a liquid state.

Ice melts at 0 degrees Celsius or 32 degrees Fahrenheit. This is the melting point (orfreezing point) of water. If the temperature goes above this temperature, the ice willmelt. Heat speeds up the moving particles in ice. If the temperature goes below thistemperature, water will freeze. At colder temperatures, the moving particles slowdown.You have probably seen a puddle of water that disappears after a time. The water inthe puddle changed into a gas. Matter evaporates when it changes from a liquid to agas. Water in the form of gas is called water vapor.Water changes quickly into a gas when water is heated to a temperature of 100 degreesCelsius or 212 degrees Fahrenheit. This temperature is the boiling point of water. Heatmakes water particles move fast.Cooling air causes water vapor to change to a liquid. Matter condenses when itchanges from a gas to a liquid.Have you ever had a glass of lemonade with ice on a hot summer day? Did you noticethe water that beaded up on the outside of the glass? The cold glass cooled the airaround it. Then water vapor in the air condensed to small drops of water on the outsideof the glass.

Another way matter can change is a chemical change. A chemical change takes placewhen matter changes into a different kind of matter. An example of a chemical changeis burning wood. The wood changes into smoke and ash. This chemical changeproduces heat and light.Have you ever seen a nail or other piece of metal that was rusted? Rusting is achemical change, too. The metal in the nails mixes with the air to form a differentkind of matter, rust.Have you ever seen an old piece of silverware that has turned black? This is anotherkind of chemical change. A gas in the air causes a black covering called tarnish toform on silver. The tarnish is a different kind of matter from the air or the silver.Signs of a chemical change are a change in color or temperature or the production ofheat or light. Bubbling, fizzing, or making a noise or smell are some more signs. Notall of these things happen during a chemical change. But usually at least one of themdoes happen.Changes in the way matter looks are physical changes. A physical change happenswhen matter changes from one state into another. A chemical change takes place whenmatter changes to a different kind of matter.

Name1. A physical change is a change in the: 4. What is the freezing point of water?A. 100 degrees CelsiusA. size and shapeB. 32 degrees FahrenheitB. state of matterC. 212 degrees FahrenheitC. appearanceD. all of the above2. Changing from a solid state to a liquid state is called:A. meltingB. freezing5. When a liquid changes to a gas, we say it:A. freezes3. What is the melting point of ice?B. condensesA. 32 degrees FahrenheitC. evaporatesB. 212 degrees FahrenheitC. 100 degrees Celsius6. What is the genre of this piece of literature? How do you now?

7. When a gas changes to a liquid, we say it:A. condensesB. freezesC. evaporates8. What kind of change happens when matter changes into a different kind ofmatter?A. physical changeB. chemical changeC. change in states of matter9. Give two examples of a chemical change and EXPLAIN why they are a chemicalchange.10. Which of these is NOT a sign that a chemical change has happened?A. change in colorB. bubblingC. change in state of matter

11. What kind of change has taken place when you sharpen a pencil? How do you know?12. What kind of change has taken place when paper is burned? How do you know?

13. Use the Venn Diagram to compare/contrast physical and chemical changes.PhysicalChemical

These kinds of changes are called physical changes. Physical changes are changes in the way matter looks. Changes in size and shape, like the changes in the cut pieces of paper, are physical changes. Physical changes are changes in the . Give two examples of a chemical change and EXPLAIN why they are a chemical

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