YR2_T1_LSN2 TV2G

• Science
• Middelbare school
• havo, vwo
• Leerjaar 2

YR2_T1_LSN2

Topic 1.1

Topic 1.1 - Learning Goals:

I can…

• Explain what makes something a substance
• Describe a substance using its properties and use properties to identify a substance
• Know the difference between a pure substance and a mixture
• Understand the difference between a homogeneous mixture and heterogeneous mixture
• Decide if a liquid mixture is a solution or a suspension based on its properties
• Explain the different ways a mixture can be separated by using separation methods

Topic 1.1 - Key Words:

• Evaporation
• Extraction
• Filtration 
• Heterogeneous mixture
• Homogeneous mixture
• Mixture
• Pure substance
• Properties
• Separation
• Solution
• Solvent
• Solute
• Substance
• Suspension

1.1 - Substances and properties:

Substance = matter = made of atoms or molecules

• Substance has mass and takes up space

Every substance has unique properties

• color
• texture
• smell
• hardness
• phase at room temperature (solid, liquid, gas)
• density
• melting point and boiling point

1.1 - Pure substance vs mixture:

• Pure substance is made up of only one kind of atom or molecule

            Example: Water → H2O

• Mixture is made up of two or more pure substances

           Example: Cola 

           (mixture of water, sugar, gas, flavors) 

1.1 - Mixtures:

• Homogeneous mixture is a mixture where different substances are equally distributed throughout the mixture

               Example: solution of sugar in water

• Heterogeneous mixture is a mixture where different substances are not equally distributed throughout the mixture

               Example: chocolate milk

Examples

Examples

HOMOGENOUS

HETEROGENOUS

1.1 - Solutions:

• SOLUTION is a clear homogeneous mixture where one substance dissolves in another. The molecules mix evenly together. Example: Sugar in water

1.1 - Suspensions:

• SUSPENSION is a cloudy heterogeneous mixture that separates into layers over time. 
• It needs to be stirred or shaken to mix well since the particles don’t dissolve.

1.1 - Separation methods:

• Extraction

Separation based on difference in solubility

• Filtration

Separation based on difference in particle size

• Evaporation

Separation based on difference in boiling point

Hw for next time:

Theory lesson:

• Complete the exercises of Topic 1.1 (p.8-11).
• Study the glossary of Topic 1.1 on Studygo.
  

LABlesson:

Find a lab partner (only pairs!)

Read the worksheet: Investigating pH

Prepare lab journal: Investigating pH