Grade 4/5

Welcome to Grade 4/5! 

For our class schedule, assignemnts and important information, log onto Miss Witten's blog. 

4/5 Blog 

Grade 4/5 Health KidBlog link

 

Hello parents of 4/5 This is Mr. Riewe

I have heard from a few parents the study guide I have posted for parents and students may be hard to find on the homework page. I do not get the same access and view of the webpage as all of you so I will have to get a tutorial from our tech department on how that can be accessed. In the mean time I will post the study guide answers here. I will let you know they will disappear tomorrow. (I can't have those answers out there for the start of next year.)

Chemistry Study Guide answers

 

  • What is a mixture

A mixture is formed of little bits of one or more substances mixed together. Usually, the parts can be separated from each other by physical means, because it does not involve any chemical reactions or bonds.

  • 3 Different separation methods

Evaporation, Filtration and magnetism. There are complete diagrams in the info book.

  • What does soluble mean?

A material is said to be soluble if it dissolves completely in a solvent.

For example: If you dissolve salt (solute) in water (solvent), the salt is broken down into Sodium and Chlorine ions within the solvent. This mixture will look and taste the same everywhere in the cup, and would have salt and water in the same proportions. In this example, salt is a soluble material.

  • How to get a soluble solid separated from a liquid

Evaporations separation method

 

  • Why can insects walk on water

You've probably seen insects that can walk on water. They're supported by a kind of invisible "structure" on the surface known as surface tension. It happens because water molecules attract very strongly to one another.

  • What is a physical Change? Example

Physical changes are usually about states and physical states of states.

When you step on a can and crush it, you have forced a physical change. However, you only changed the shape of the can. It wasn't a change in the state of matter because the energy in the can did not change. Also, since this was a physical change, the molecules in the can are still the same molecules. No chemical bonds were created or broken. 

 

  • What is a Chemical Reaction? What is an example of one?

Chemical changes happen on a molecular level when you have two or more molecules that interact. Chemical changes happen when atomic bonds are broken or created during chemical reactions. 

Chemical changes usually cannot be reversed. Meaning that once the change has occurred you would not be able to change the items back to the way they were. 

 

  • Ways to tell of a chemical reaction has occurred?

How to tell a chemical change has occurred.

  1. Bubbles of gas appear
  2. A precipitate has formed
  3. A color change occurred
  4. The temperature has changed
  5. Light is emitted
  6. It is a different size
  7. It has a different smell or taste.

 

  • What is water made of?

Each molecule of water is made up of three atoms: two hydrogen atoms locked in a sort of triangle with one oxygen atom—giving us the famous chemical formula H2O.

  • How are Acids and bases measured?

Scientists use something called the pH scale to measure how acidic or basic a liquid is.

  • PH levels

Distilled water is 7 (right in the middle). Acids are found between 0 and 6. Bases are from 8 to 14. Most of the liquids you find every day have a pH near 7.

  • What is a hypothesis?

Hypothesis - a statement that uses a few observations, an idea or proposition based on observations without experimental evidence

An educated guess

 

  • Steps of the scientific method
  1. The Question
  2. Background Research
  3. Hypothesis
  4. Experiment
  5. Data
  6. Observation
  7. Conclusion
  8. Communication
  • 3 States of matter we have in the classroom

 

Solid, Liquid and gas

 

  • Safety rules
  1. Students are not allowed to touch any chemicals or lab equipment unless they are instructed to do so.

 

  1. Students should never ever work in science lab in the absence of their teachers.

 

  1. Students must follow all the written and verbal instructions when conducting the science experiment.

 

  1. If there is anything you do not understand ask for help before starting the experiment.

 

  1. It is very important to be alert and be cautious when in the science laboratory. Eating, drinking, playing pranks, or listening to music is be strictly prohibited.

 

 

  1. When mixing chemicals or conducting the experiment, keep the test tube containing the chemical away from your face, mouth, and body.

 

 

  1. Unused chemicals should never be put back in the original bottle. They must be disposed of as per the guidelines given by the science teacher.

 

  1. Students must be made to wear appropriate safety equipment.

 

 

  1. Hot items take time to cool down. Allow time to cool them down and use tongs or heat protective gloves to pick them up.

 

  1. If any accident takes place, do not panic. Inform your teacher immediately and lab assistants for help.

 

  • Descriptions of Solids, Liquids and gases

Liquids, like water, oil and soda, shift to fit inside the container they’re in. If you look at them under a microscope, you’ll see that they have particles that are close together, but have no rhyme or reason. The molecules move around.

 

Gases, including air, steam and helium, are free-flowing. You can easily put your hand through them. Gases shift to fit their container and can even fill it. Their molecules are spaced far apart and wiggle and jiggle.

 

Solids, like your desk, your backpack and your pants, are firm and stable. Their molecules are grouped together in organized patterns. The molecules might vibrate slightly, but they don’t move around.

 

  • What is a pure substance? Example

A pure substance is defined as substance that is made of only one type of atom or molecule such as an element like gold or a molecule like distilled water.