matter: physical and chemical changes part 2
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Matter: Physical and Chemical Changes
Matter: Physical and Chemical Changes Part 2
1Correct!
40OOPS!Did it change size, color, shape (Physical Change)?orDid it become different matter (Chemical Change)?
39Physical Change
4Chemical ChangeChemical 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.
5C. Chemical ChangeRemember!properties changeirreversibleSigns: color change, formation of a gas/solid, release of light/heat
Chemical ChangeA 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.
7 DensityDensity describes how much mass is in a given volume of a material.
8DensitySolids, liquids and gases are matter, so they all have density.
9Determining DensityTo 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.
10 Density Problems
11What is my Density?Mass1. 500g
2.300g
3.25g
Volume50ml
15ml
5cm3
Complete the following questions on a separate sheet of paper as a part of your homework assignment.
1250gl/200ml= 2.5 g/ml : 300g/255ml=1.18g/ml: 6.25g/5.75cm3= 1.09g/cm3 AnswersQuiz YourselfGo 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 ChangePhysical Change14OOPS!Did it change size, color, shape (Physical Change)?orDid it become different matter (Chemical Change)?
15Correct!
16Is it a chemical or physical change?Logs burning
Chemical ChangePhysical Change17OOPS!Did it change size, color, shape (Physical Change)?orDid it become different matter (Chemical Change)?
18Is it a chemical or physical change?Cutting paper
Chemical ChangePhysical Change23Correct!
37