Week+14

=Monday= media type="youtube" key="k60jGJfV8oU" width="560" height="315"

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Let's check out the moon @http://lunaf.com/english/live-data/moon-phase/

As well as the sunrise and sunset times for today @http://www.timeanddate.com/worldclock/astronomy.html?n=411

= = = = = =

===Stephanie notices that the big puddle she stepped in during morning duty in the parking lot was not there when she was on afternoon duty. What most likely happened to that puddle? ===


 * 1) ===The water in the puddle underwent a chemical change as it changed from a liquid to a solid. ===
 * 2) ===The water in the puddle underwent a physical change as it changed from a liquid to a gas. ===
 * 3) ===The water in the puddle underwent a chemical change as it changed form a liquid to a gas. ===
 * 4) ===The water in the puddle underwent a physical change as it changed from a liquid to a solid. ===

Kirk's Observations of Samples Tested

 * ===Sample === || ===Observation === ||
 * ===1 === || ===Dissolves in water === ||
 * ===2 === || ===Burns in air === ||
 * ===3 === || ===Gives off bubbles when placed in vinegar === ||
 * ===4 === || ===<span style="font-family: Arial,Helvetica,sans-serif; font-size: 110%;">burns when heated === ||

<span style="font-family: Arial,Helvetica,sans-serif; font-size: 110%;">B. Sample 2 D. Sample 4
= = =Tuesday= <span style="font-family: Arial,Helvetica,sans-serif; font-size: 140%;">Watch me SRE This!

DeMia is making an omelet. She breaks some eggs into a bowl and uses a fork to beat the eggs. Then, she mixes shredded cheese into the eggs. Finally, she pours the mixture into a hot pan and cooks it until it forms a solid omelet. During which step does a chemical change occur?

F. DeMia breaks eggs into a bowl. G. DeMia uses a fork to beat the eggs. H. DeMia makes a mixture of eggs and cheese. I. DeMia cooks the mixture of eggs and cheese until it forms a solid.

Your Turn!

The table below lists four elements and a change that each underwent during an experiment. Changes in Certain Elements Based on the information in the table, which element underwent a chemical change?
 * Element ||= Change ||
 * Copper || Bends easily ||
 * Lead || Melts at 327 degrees ||
 * Iron || Rusts ||
 * Oxygen || Dissolves in water ||

F. copper H. iron

G. lead I. oxygen


 * Wednesday **

My turn to SRE! To play a guitar, a person plucks, or pulls and releases, tight metal strings on the guitar. When different strings are plucked, you hear different sounds.

What causes the sounds that you hear?

A. Heat given off by the strings on the guitar B. Electricity from the strings on the guitar C. Friction from the plucking on the strings D. Vibrations made by plucking the strings

Your Turn!

Which of the following describes an exammple of a material undergoing a chemical change to become another material with different characteristics?
 * 1) Rock salt is crushed into smaller pieces to become table salt.
 * 2) Water boils and turns into a vapor, which is a gas
 * 3) CO2 becomes a solid at very low temperatures
 * 4) Copper can be hammered out very thin to cover a large plate.

My Turn to SRE!

The class investigated how different temperatures of water affected the time it took ice cubes to melt. Each group repeated the investigation the same way three times and recorded the data each time. The class looked at the data every group collected when they discussed the investigation.

Why is it important for scientists to repeat an investigation and look at all the data they have collected?

A. To be sure their procedures were correct B. To see if their equipment was working properly C. To find out if anyone copied data from another scientist D. To compare similar data in order to form a valid conclusion

Your Turn to SRE!

The class investigated the temperature of water in each of its three states. They measured the temperatures of crushed ice, room temperature water, and water vapor from a cup of hot water. Which of the following statements BEST describes what the class observed?

A. Solid water is warmer than liquid water. B. Water vapor is colder than liquid water. C. Liquid water is the same temperature as water vapor. D. Solid water is colder than water vapor and liquid water.

My Turn to SRE!
 * Thursday **

The class is investigating the dissolving of several substances in water. One group decides to use a whole piece of hard candy and the same kind of candy crushed into small pieces.

Which of the following is the BEST testable question for this group’s investigation?

A. Do substances dissolve faster when they are stirred? B. How does the temperature of water affect how a substance dissolves? C. Does the surface area of a substance affect how fast or slow it dissolves? D. Why do some substances dissolve in water and some substances do not?

Your Turn to SRE!

Diamond put ice cubes in her glass of lemonade. After a short time, tiny water drops form on the outside of the glass. What caused this water to form?

A. The coldness of the glass makes water vapor in the air turn into liquid water on the outside of the glass. B. The warmth of the air makes water vapor in the air turn into liquid water on the outside of the glass. C. The ice melts and becomes liquid water on the outside of the glass. D. Water comes through the glass to the outside of the glass.

=Friday=