Density lab-September 10

—  Learning Target

I will find the mass and volume of various objects. I will use these measurements to find the density of each object. I will compare the density of the different objects. 

—  Criteria for Success

I will be able to place the  objects from my lab in order based on their density. I will be able to explain how density is a physical property.

—  Review

—  Salt is _________ in water

—  Salt is
soluble
in water.

—  Sand is ____________ in water

—  Sand is insoluble in water

—  If you can see sugar at the bottom of you solution it is a _________ solution.

—  Milk is a mixture. It is a ________.

—  Milk is a mixture. It is a colloid.

—  Trail mix is a ______________mixture.

—  Trail mix is a heterogenous
mixture.

—  Salt Water is a type of ____________

—  Salt Water is a type of solution.

—  Cake batter is a __________ mixture.

—  Cake batter is a homogeneous mixture.

—  We are going to be going into the lab to find the density of different objects. Be sure to follow all lab safety rules. Follow all my directions.
 

—  Reflection

Place the objects from the lab we did today in order based on their density. Explain how density is a physical property.

Density September 9

l  Learning Target

I will learn how to use mass and volume measurements to find the density of objects and substances.

l  Criteria for Success

I will be able to explain how density can be used to compare different objects and substances.

l  Soluble

capable of being dissolved

Examples:

sugar and water

salt and water

l  Insoluble

incapable of being dissolved

Examples:

sand and water

metal and water

l  Saturated Solution

A solution in which the maximum amount of solute has been dissolved

l  Unsaturated Solution

A solution which can dissolve more solute

l  Sugar and Water Observation Activity

l  Density

l  What is density?

Density is a comparison of how much matter there is in a certain amount of space.

l  Which one is more dense?

Demonstration: People in a square

How about this: Which square is more dense?

l  Which one is more dense?

l  Mass: A measure of how much matter is in an object
Volume the measure of the amount of space something takes up

Density =  mass         

                   volume

                                   

l  Let’s try a density problem together

Frank has a paper clip. It has a mass of 9g and a volume of 3cm³. What is its density?

l  Let’s try a density problem together

Frank also has an eraser. It has a mass of 3g, and a volume of 1mL. What is its density?

l  Work on these problems with your table.

Jack has a rock. The rock has a mass of 6g and a volume of 3mL. What is the density of the rock?

l  Work on these problems with your table.

Jill has a gel pen. The gel pen has a mass of 8g and a volume of 2cm³. What is the density of the gel pen?

l  Now, try these on your own.

Victoria has a watch. It has a mass of 4g and a volume of 2cm³. What is the density of the watch?

l  Now, try these on your own.

Mia has a wallet. It has a mass of 15g and a volume of 5cm³. What is the density of the wallet?

l  How do we measure mass and volume?

Explain how density can be used to compare different objects and substances.

Thurs/Fri Sept 4th and 5th

•Give an example of a heterogeneous mixture. How do you know it is heterogeneous. Is there any way to make the mixture homogenous? Why or why not?   

•Learning Target

I will learn about factors that change the rate a solute dissolves in a solvent.

•Criteria for Success

I will be able to explain some of the factors that can change the rate at which a solute dissolves in a solvent.

•Solution

A homogeneous mixture where one substance is dissolved in the other.

•Solvent

a liquid, solid, or gas that dissolves another solid, liquid, or gaseous solute

When you dissolve salt in water, water is the solvent.

•Solute

A substance dissolved in another substance.

When you dissolve salt in water, salt is the solute.

•There are many different factors that can change how fast or slow a solute dissolves in a solvent.

•We are going to make some of these mixtures in the lab! Remember to follow all lab safety rules! Do not eat or smell anything, wear your goggles the whole time, listen to my directions!!!

•Reflection

Explain one factor that can change the rate at which a solute dissolves in a solvent

Science Notes Tuesday, September 2

Chemical Change

2H₂+O₂à 2H₂O

Hydrogen plus Oxygen makes water

http://www.britishpathe.com/video/actual-zeppelin-crash-aka-hindenburg-airship-disas

Learning Target and Criteria for Success

I will learn about different kinds of mixtures.

            I will be able to explain why            creating a mixture is an       example of physical change.

Mixture

Two or more substances that are mixed together, but not

chemically combined.

Examples

Salad

 Trail Mix

Cookie dough

Two Types of Mixtures

Heterogeneous: the parts of the mixture are not uniform

Two Types of Mixtures

Homogeneous: the parts of the mixture are uniform

Solution

A homogeneous mixture where one substance is dissolved in the other.

Colloid

A mixture where one substance is suspended in

another.

We are going to make some of these mixtures in the lab! Remember to follow all lab safety rules! Do not eat or smell anything, wear your goggles the whole time, listen to my directions!!!

Reflection

Explain why creating a mixture is an example of a physical change. What is taking place with the molecules of oil and water mixture?

Chemical Change

2H₂+O₂à 2H₂O

Hydrogen plus Oxygen makes water

http://www.britishpathe.com/video/actual-zeppelin-crash-aka-hindenburg-airship-disas

Learning Target and Criteria for Success

I will learn about different kinds of mixtures.

            I will be able to explain why            creating a mixture is an       example of physical change.

Mixture

Two or more substances that are mixed together, but not

chemically combined.

Examples

Salad

 Trail Mix

Cookie dough

Two Types of Mixtures

Heterogeneous: the parts of the mixture are not uniform

Two Types of Mixtures

Homogeneous: the parts of the mixture are uniform

Solution

A homogeneous mixture where one substance is dissolved in the other.

Colloid

A mixture where one substance is suspended in

another.

We are going to make some of these mixtures in the lab! Remember to follow all lab safety rules! Do not eat or smell anything, wear your goggles the whole time, listen to my directions!!!

Reflection

Explain why creating a mixture is an example of a physical change. What is taking place with the molecules of oil and water mixture?

Burning a piece of wood is a chemical change. Explain how you can tell it is a chemical change? What is happening with the molecules when the chemical change takes place?

Science Notes for Friday, August 30

Why is it important for YOU to study atoms? How could studying them help you in your future? How can studying them help your understanding of the world?

—  Learning Target and Criteria for Success

I will learn about physical and chemical properties and changes.

            I will be able to explain the             difference between physical           and chemical properties and           changes.

—  Questions from Yesterday!

—  Atom

The smallest particle into which an element may be divided and still be the same substance.

—  Matter

—  Molecule

Particle of matter that is made up of two or more atoms

—  Physical Property

A characteristic of a substance that can be observed without changing the substance

Ex: color, size,

shape, hardness

—  Observe it!
Observe the object with your group. Write down some of the physical properties.

—  Chemical Property

Properties that may only be observed by a chemical reaction or change. 

Ex: flammability, ability to combine with other substances, ability to rust

—  Observe it!
Observe the object with your group. Write down any chemical properties that you suspect it has.

—  Learning Target and Criteria for Success

I will learn about physical and chemical changes.

            I will be able to explain the             difference between a physical        and chemical change.

—  Essential Questions

—  Physical Change

A change that alters the form or appearance of a material but does not make the material into

another

substance.

—  Physical Change

Ex: ice melting

            crushing a can

            tearing paper

            melting metal

            cutting a piece of wood

            breaking a glass bottle

—  Let’s Try it.
We are going to make a model of what happens when carbon dioxide goes from a solid to a liquid to a gas.
 

—  Chemical Change

A change in matter that produces a new substance with different

properties.

—  Examples

Wood burning

Dissolving salt in water

Cooking eggs

Metal rusting

Baking cookies

—  Some ways to tell a chemical reaction might have taken place:

—  Change in color (for example, when metal rusts)

—  Change in temperature

—  Give off light, heat, or sound

—  Formation of gases, often appearing as bubbles

—  Lets try it!
We are going to make a model of what happens when you make water from hydrogen and oxygen

2H₂ + O₂         2H₂O

—  Lets try it!
We are going to make a model of what happens when copper is exposed to oxygen.

2Cu + O₂         2CuO

—  Lets try it!
We are going to make a model of what happens when you burn methane.

CH₄+ O₂            CO₂+ H₂O

—  Reflection

Explain the difference between physical and chemical changes. Explain what is happening to the atoms and molecules in both a physical and chemical change.