Create TextBook_Questions.md

Grade 9/Science/SNC1DZ/TextBook_Questions.md

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+# Unit 2
+
+## Questions to Ask Ms.Keras
+1. How do you tell the difference between mechanical mixtures and a mixture/solutions?
+
+## Page 178, Questions 3 - 10.
+
+Alloys: When two or more types of metals are mixed together.
+
+Solder Materials: Used to join together metal components, such as wires in electrical circuits and copper pipes in building, like glue.
+
+2.  **Use the particle theory to explain why water changes from a solid to a liquid when it is heated.**
+
+    As water is heated, the particles or atoms gain energy, thus begin to spread apart and moving quicker, and when particles are spread decently apart, that state is called a liquid state.
+    
+    
+3. **Give 3 examples of a pure substance**
+   1. Water
+   2. Milk
+   3. Apple juice
+
+4. **Give three examples of a mixture**
+  
+   1. Soup
+   2. Cereal with milk
+   3. Granorla Bar
+
+5. **Describe a Mechincal Mixture**
+  
+   A mechinal mixture could be something like a cereal with milk, where you can see the cereal and milk easily.
+   
+6. **Describe a Solution**
+
+  A solution could be something like apple juice, where there are different types of particles present, but are evenly mixed.
+  
+7. **Use a Venn diagram to compare mechanical mixtures and solutions**  
+
+   |Mechnical Mixtures|Both|Solutions|
+   |:-----------------|:--:|--------:|
+   |Apple Juice|
+   
+8. **Identify each of the following as a mechanical mixture or a solution**
+  a. a pane of clear glass. **Solution**
+  b. chocolate chip ice cream. **Mechanical Mixture**
+  c. clear apple juice. **Solution**
+  d. a pizza. **Mechanical Mixture**
+  e. garbage in a garbage can. **Mechanical Mixture**
+  
+9. **What kind of alloy makes an effective solder material?**
+    Tin and lead make an effective solder material, as it is fluid at high temperatures but solidifies quickly.
+    
+10. **Lead is not often used in solder anymore. Explain why not.**    
+
+    As lead is a heavy metal, it causes radioactive damage to humans, such as brain damage, which makes it harmful and unsafe.
+    
+## Pages 182 Questions 1 - 5
+
+1. Are qualitative properties and physical properties basically the same thing?
+
+1. **Explain the difference between a qualitative property and a quantitative property**
+  
+  A qualitative property is a property that is of the **qualities** of an thing, for example, metal, which is very shiny and hard. A qualitative property
+  cannot be measured. 
+  
+  A quantitative property is something that can be measured, like the temperature of the metal, the mass or size of the metal.
+  
+2. **A student recoreded the following observations about a T-shirt. Classify each observation as a qualitative property or a quantitative property, and give reasons for your answers**  
+
+    a. It is red and grey in colour. **Qualitative**, as it cannot be measured and is a quality of the object.
+  
+    b. It is 60 cm long. **Quantitative**, as it its measured in cm and is the length of the object.
+  
+    c. It is soft and strectchable. **Qualitative**, it is a property of the material.
+  
+    d. It will shrink in 70<sub>o</sub> water. **Qualitative**, it is a property of the material. **Ask MS KERAS**
+
+3. **What physical properties are important for the materials used to make mountain bikes?**
+
+  The bikes should be light weight, hard, durable and comfortable.
+  
+  
+4. **List four physical properties of each of the following**
+
+    * a piece of copper wire   
+        1. its shiny        
+        2. hard        
+        3. bendable        
+        4. smooth
+        
+    * 500 g of butter    
+        1. soft        
+        2. easy to cut through        
+        3. really creamy        
+        4. smells like cheese and milk
+        
+    * a glass of milk    
+        1. opaque        
+        2. white        
+        3. liquid       
+        4. non-viscous
+        
+    * a candle    
+        1. hot        
+        2. bright        
+        3. waxy        
+        4. soft
+        
+    * a piece of aluminum foil    
+        1. shiny        
+        2. smooth       
+        3. grey        
+        4. solid 
+        
+    * a spoonful of sugar    
+        1. powdery        
+        2. white        
+        3. sweet       
+        4. solid
+        
+    * toothpaste    
+        1. somewhat viscous        
+        2. opaque        
+        3. taste like the flavour of the toothpaste
+        4. squishy
+        
+5. **In each of the situations below, it seems that a new substance may have been produced. Explain why each situation represents a physical change.**
+
+  * A tailor makes a new suit out of a piece of fabric
+    - it is still a piece of the same fabric, thus no new substances have been produced, this is a physical change.
+    
+  * A chef makes a salad out of lettuce, tomatoes , and cucumbers
+    - This is a mixture of different substances, but no new substances have been created, this is a physical change.
+   
+  * A mechanic builds a boat engine out of a lawnmower
+    - The mechanic's lawnmower are still made of the same parts of the boat engine, thus no new substance was created.
+    
+  * A chemist boils slat water until only salt crystals are left.
+    - The water evaporated but the salt was already present in the water, thus its a pyhsical change.
+    
+  * A child makes juice by adding water to juice concentrate
+    - Juice already contains water, and adding more water just water downs the solution, but does not create a new substance.
+
+
+## Pages 186 Questions 1 - 7
+
+1. **Describe the diference between a physical change and a chemical change**
+  In a physical change, no new substance is created, while a new substance is created in a chemical change.
+  
+2. **Explain why water freezing is not a chemical change.**
+  As freezing water is just changing the state of water, water is still water, so there has been no new substance created.
+  
+3. **Classify each of the following as a physical or a chemical property**
+  - metalic lustre **CHEMICAL**
+  - boiling point **PHYSICAL**
+  - explodes when ignited **CHEMICAL**
+  - changes colour when mixed with water **CHEMICAL**
+  
+4. **Classify each of the following as a physical change or a chemical change. For each chemical change, explain how you can tell that a new substance has been formed**  
+
+  - Water boils and turns into steam
+    - Physical change, there is not new substance
+  - Wood is sawed and made into a toy box
+    - Pyhsical change, the toy box is still made up of the same wood
+  - Firewood burns and ashes remain
+    - Chemical change, the ashes are the new substance
+  - Orange drink crystals are stirred into a pitcher of water
+    - Physical change, there is no new substance being created.
+  - Sugar eggs, and flour are mixed and baked into cookies
+    - Chemical change, the cake is the result of the ingredients reacting with bacterias and each other
+    
+5. **What evidence is there that a glowstick works as a result of a chemical change?**  
+   The glowstick glows due to the two chemicals at both ends meeting each other, which a new lumious liquid is made.
+
+6. **When a candle is lit and allowed to burn for 15 minutes, some wax drips and colelcts at the base of the candle, and the candle becomes shorter**
+  - Did you observe any physical changes? Explain
+    - yes, as the candle got shorter due to the flame buring it off.
+  - Why did the candle become shorter? What happened to the missing section of the candle
+    - the missing section of the candle turned into liquid due to the heat melting it.
+  - Did you observe any evidence of chemical change?
+    - **ASK MS KERAS**
+7. **Think about each of the following situations and describe one chemical change that is occurring. provide evidence of the chemical change**
+  - A driver starts the car in the drive way
+    - The gasoline is being burned of to created electricity, and produces fumes that exit the car.
+  - A bathroom cleaning product removes a stain in the sink
+    - The chemicals in the product reacts with the stain, and the result is the removal of the stain.
+  - Bubbles form when baking soda is mixed with lemon juice
+    - The bubbles are the result of the chemical change
+  - Cookies baking in the oven give off a delicious aroma
+    - The ingredients are reacting with the heat to create the smell.
+  - A match is struck and ignites
+    - The friction of 2 substances sets off a chemical reaction that allows the match to light on fire
+  - Bleach turns a red towel white
+    - The bleach chemicals react with the pigments in the towel, resulting in the removal of the colour of the towel.
+  - A banana tastes sweeter as it ripens
+    - The chemicals in the banada react to heat and age, producing glucose, which makes it sweeter.
+    
+ ## Pages 215 Questions 1-10
+ 
+ Metalliod: an element that has properties of both metals and non metals
+ 
+ Non metal: an element, usually a gas or a dull powdery solid, that does not conduct heat or electricity.
+ 
+ Element: a pure substance that cannot be broken down into a simpler chemical substance by any physical or chemicl means
+ 
+ Compound: a pure substance composed of two or more different elements that are chemically joined
+ 
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