Grade 7 Discussion Question for Rate of Dissolving Lab

The answer to this question should be included in the discussion section of the rate of dissolving lab report.

1. Using what you have learned in Chapter 8, explain in detail how (temperature, particle size, stirring, type of solvent) affected the rate of dissolving.

Grade 7 Lab Report Guideline

Lab Report Guideline

Problem or Purpose

What is the experiment designed to find out or demonstrate?

An example of a problem would be; “Which will hold more drops of water, an older penny or a newer penny?”

An example of a purpose would be; “To determine which holds more water, a newer penny or an older penny?”

Hypothesis

Write an educated guess in the “if, then, because” format. Be sure to include the manipulated variable and the responding variable. An example of this would be:

If a newer penny is tested then it will hold more water because the newer penny will have higher edges to act as barriers.

Safety

Provide any safety information that should be followed or safety gear that should be used when performing the experiment; e.g., safety goggles.

Materials and Equipment

Using a table, provide a list of all materials and equipment.

Procedure

Make a numbered list of the steps you will need to follow as you perform the experiment. Your goal is to write enough information so you will know what to do, or that someone who has never done this lab would be able to follow your instructions step by step. Point form is acceptable.

 Data and Observations

1. Write a paragraph describing what you observed.
2. Create a table or chart for any data.  
3. Draw at least one picture that shows what you observed. Drawings should always be in pencil and labeled.
4. Create a graph with your data if possible.

Discussions/Analysis Questions

You will receive questions to answer in this section. Answer in full sentences using appropriate scientific vocabulary. Be sure to be detailed in your responses.

Conclusions

In this section you will demonstrate your understanding of the lab.

What to put in your conclusion section:

1. Look back at your purpose/problem. Was the purpose satisfied or the problem solved?
2. Was your hypothesis correct or incorrect, and what did you learn from the outcome?
3. What specifically did you learn and how can that be applied to your life today or to your understanding of the world.

Sources of Error

Explain any possible errors that may have changed your results; e.g., one of your controlled variables wasn’t consistently controlled.

Please note:

a)      You may have the same information as your group members up to and including the observations section. Beyond the observations section, everything is independent.

b)      Write using only one font and keep the font size to 12 point.

c)       Subtitles should be underlined or bolded.

d)      Any research you do should be cited in a works cited list. Be sure not to plagiarize someone else’s ideas.

8B Math Chapter 5 Test and Task

The chapter 5 test will be on Wednesday January 23rd 2013. Your task is also due on this date. The task outline is below.

Chapter 5 Task – Design a Logo

You have managed to become part of the best of the best! Yes, you have been accepted into the elite Willowdale Mathletes Club! The club is holding a contest to see who can design the new Math club logo. You really want to impress the club, so you want to make an awesome design!

The criteria for the design is that it must be a circle and must contain at least 2 other circles inside the larger circle. As well, in order to be sure that it meets certain criteria, you must include the following:

·         Complete calculations of the circumference and area of each circle

·         The area of the interior of the larger circle that is not covered by the 2 circles

·         The logo must be hand drawn

You must also complete the design using the appropriate tools, i.e., a compass and a ruler.

The logo design must be submitted on Wednesday January 23^rd 2013

Good luck Mathletes!

Grade 6 Current Electricity Test - Thursday January 24th

Current Electricity Test Study Guide

1. Define current electricity
2. How does current electricity work?
3. Review how to draw series and parallel circuits using the appropriate symbols
4. Review how to fix electrical problems relating to series and parallel circuits
5. Review the key terms below:

1. Open and closed circuits
2. Insulators and conductors
3. Complete and incomplete circuits
4. Series and parallel circuits
5. Short circuits
6. electrons
7. filament
8. fuse
9. wire
10. battery

Grade 6 Static Electricity Websites

This website has some good information about lightning and a very cool slow motion video of a lightning strike.

http://www.sciencemadesimple.co.uk/activities/lightning

A good overview and some definitions for static electricity.

http://www.school-for-champions.com/science/static_electricity.htm

Play these 2 fun review games about static electricity!

http://www.quia.com/rr/126865.html

http://members.shaw.ca/vict/static_test.htm

Grade 6 Static Electricity Test Study Guide

Static Electricity Test Study Guide

Define static electricity

Describe 3 examples when static electricity can occur

What is “The Law of Electrostatics?”

How does moisture help reduce static electricity?

What is lightning and how is it related to static electricity?

I have postponed the test until Friday January 18th. This will allow us to do some in class review.

Grade 7 Notes Section 8.1

Solutions: Concentration and Solubility

Solutions

• are homogeneous mixtures
• have the same appearance throughout

Alloys – a special name for solid solutions (e.g., steel)

Solute – the substance that dissolves

Solvent – the substance which does the dissolving

E.g., in sugar and water, the water is the solvent and the sugar is the solute

Water – The Universal Solvent

Water is able to dissolve many different solids, liquids and gases

Not all substances are soluble in water; e.g., fat is insoluble in water

Solubility

Solubility can be defined as:

a)      the relative ability of a solute to form a solution when added to a certain solvent

b)      the maximum amount of solute you can dissolve in a fixed amount of solvent at a given temperature

Forming a Solution

To form a solution, the solute particles must be attracted to the solvent particles; e.g., salt particles are attracted to water particles

We can say that salt is soluble in water because it dissolves in water

Salt and olive oil will not form a solution because the salt particles are not attracted to the oil particles

We can say that salt is insoluble in olive oil because it does not dissolve in olive oil

Concentration – Qualitative

A concentrated solution: A solution that contains a lot of dissolved solute compared to the amount of solvent; e.g., a can of frozen orange juice

A dilute solution: A solution that contains very little solute compared to the amount of solvent; e.g., a solution of water and the can of frozen orange juice

Concentration – Quantitative

The concentration of a solution can be written as the amount of solute dissolved in a specific amount of solvent.

For example, if 5 grams of salt are dissolved in 500 milliliters of water; the concentration is 5g/500mL

Often we reduce this to a value out of 100mL; so it can be written a 1 gram/100mL

This can also be called a 1 percent solution; this means that for 100mL of solvent there is 1g of solute dissolved in it

Saturation

Saturation: The maximum amount of solute that can be dissolved in a certain amount of solvent at a certain temperature

Saturated Solution: one that has been saturated

Saturation Point: The point at which no more solute can be dissolved in a fixed volume of solvent at that temperature

If more solute can be dissolved into a solvent at a given temperature, then it is called an unsaturated solution.

Sometimes a saturated solution can be cooled below a critical temperature to form a supersaturated solution.

This type of solution contains more solute that would normally be dissolved in the solution at that temperature.

Grade 6 Notes from Series and Parallel Cicuit Activity

Communicate answers from page 22

1. Similarities between series and parallel circuits
1. Both use light bulbs, batteries, wires
2. Both considered circuits
3. Both require a complete loop to work
4. Both can work with same voltage battery
5. Can be used to light up a light bulb

Differences between series and parallel circuits

a.       Series circuits lose their complete loop once one light bulb is removed while parallel circuits can keep remaining light bulbs lit

b.      A series circuit is only one loop, while a series circuit makes more than one loop

c.       A parallel circuit is more complex than a series circuit

d.      A parallel circuit requires more materials

e.      The electrons in a parallel circuit can take more than one path

f.        Parallel circuits are more useful

2. When one light bulb is removed, the circuit (loop) is broken

3. In a parallel circuit there are more paths for electrons to follow to return back to the light bulb

4. Examples of series circuits:
1. A flashlight
2. Lit up signs
3. Power lines
4. Christmas lights

5. Examples of parallel circuits:
1. Outlets in homes
2. Computers
3. All appliances in our homes

 

Grade 6 Static Electricity Test Tuesday January 15th

Your study guide will be posted soon.