Matter: Physical and Chemical Changes Part 2

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Presentation transcript:

Matter: Physical and Chemical Changes Part 2

Physical Change Physical changes occur when matter changes its property but not its chemical nature. Physical changes could include a change in: texture, shape, size, color, odor, volume, mass, weight, and density.

Physical Change Remember! properties remain the same reversible can be used to separate mixtures

Physical Change

Chemical Change Chemical changes are changes matter undergoes when it becomes new or different matter. To identify a chemical change look for signs such as color change, bubbling and fizzing, light production, smoke, and presence of heat.

C. Chemical Change Remember! properties change irreversible Signs: color change, formation of a gas/solid, release of light/heat

Chemical Change A chemical change occurs when fireworks are used. Fireworks are made of metals such as magnesium and copper. These change chemically as they light up the sky.

Density Density describes how much mass is in a given volume of a material.

Density Solids, liquids and gases are matter, so they all have density.

Determining Density To find the density of a material, you need to know the mass and volume of a solid sample of the material. Mass is measured with a balance or scale. Use the displacement method or calculate the volume.

Density Problems

What is my Density? Volume 1. 500g 50ml 2. 300g 15ml 3. 25g 5cm3 Mass Complete the following questions on a separate sheet of paper as a part of your homework assignment. Mass 1. 500g 2. 300g 3. 25g Volume 50ml 15ml 5cm3 50gl/200ml= 2.5 g/ml : 300g/255ml=1.18g/ml: 6.25g/5.75cm3= 1.09g/cm3 Answers

Quiz Yourself Go through the following slides to quiz your knowledge of physical and chemical changes. Remember there is a quiz tomorrow!

Is it a chemical or physical change? Sugar dissolving in tea Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? Logs burning Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? Breaking water up by separating it into hydrogen and oxygen Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? Cutting paper Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? Crushing an aspirin Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? Metal rusting Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? Lighter fluid burining Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? An egg rotting Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!

Is it a chemical or physical change? An egg breaking Chemical Change Physical Change

OOPS! Did it change size, color, shape (Physical Change)? or Did it become different matter (Chemical Change)?

Correct!