A day in the life of a pencil sharpener wouldn't be the greatest day! Tomorrow we'll share group paragraphs.
If you woke up tomorrow as an inanimate object, what object would it be? A running shoe? Basketball? Hockey stick? Teddy bear? Toothbrush? Pencil? Computer?
Think about it for tomorrow....
Math
Today we worked with the 24-hour clock and writing dates in numeric format.
How would you write the following times using the 24-hour clock?
2: 17 pm
35 minutes and 19 seconds past 7:00 pm
How would you write these dates in numeric form?
September 21, 2013
May 3, 2001
We will wait until Thursday to have our test on time. Wednesday we will begin multiplication and division. You should know your 1, 2, 5, and 10 times tables by heart to 10. Grade 5, you need to know them to 12.
Science
Water...... without it, there would be no life on earth. So what is so special about water that the solid form floats on the liquid form? In general, solids are more dense than liquids. So why does ice float? Why is that so important?
Watch the video to find out!
https://www.youtube.com/watch?v=UukRgqzk-KE
What about the investigation with the syringe. Why could you press the syringe down when there was air inside, but not when there was water?
How many drops of water did you put on your penny?
What was happening in that investigation? Read the information below. So, is water sticky?
Although a water molecule has an overall neutral charge, the actual structure of a water molecule makes it a polar molecule (it has a positive end and a negative end). The two hydrogen atoms are slightly positive, and the oxygen atom is slightly negative. A weak link occurs between the negatively charged oxygen atom of one water molecule and the positively charged hydrogen atoms of a neighbouring water molecule. This weak link is called a hydrogen bond. The polarity of the water molecule can also cause it to be attracted to molecules of other polar substances.
There are two types of "stickiness" in this demonstration: cohesion and adhesion. The attraction between water molecules is called cohesion. The cohesive force that occurs between water molecules is so strong that, at the water's surface, it creates a "skin", which is known as surface tension. Surface tension is strong enough to support insects that crawl across the water's surface, like water striders.
Cohesive forces are strong, but not unbreakable. As the water drop builds up and out, usually bulging over the sides of the penny, the cohesive forces will eventually be overcome by the force of gravity on the water molecules. The "skin" will burst, and all of the water will spill off.
The attraction of water molecules to other substances, like soil or glass, is called adhesion. As drops of water are added to the penny, the adhesive force between the water and the penny keeps the water from falling off.
The cohesive forces between polar molecules are stronger than those between non-polar molecules, such as those in oil or syrup. That's why you can make a bigger "pile" of water than of oil or syrup.
