| Category | Format | Size |
|---|---|---|
| Zhejiang Education Edition Seventh Grade Science Volume 1 | pptx | 6 MB |
"Physical Properties and Chemical Properties" PPT courseware
Description
"Physical Properties and Chemical Properties" PPT courseware
Part One: Story Introduction
What did you see with Mr. Sleepwalker? Which of these substances have changed and how? Please record it on the activity sheet.
Mr. Peter lit up heart-shaped lanterns to celebrate his wife's birthday. Unfortunately, the wax dripped on the cake, and the cake was ruined. Mr. Peter handed the rose he folded with colored paper to his wife, but he was so clumsy that he actually touched it. Candlelight, half-burnt paper rose.
Can you provide a descriptive analysis of these changes?
Light up the lanterns
Color variation: gray black-yellow
glow, heat
candle melted
State changes: solid - liquid
Paper turns into paper flowers
Shape changes: paper pieces - paper flowers
paper burning
Material change: creation of new matter
Color variation: color - black
glow, heat
Physical properties and chemical properties PPT, part 2: practice
Determine whether the following changes are physical changes or chemical changes?
1. Candle burning chemical changes
2. Physical changes of balloon explosion
3. Explosive chemical changes
4. The electric heating wire emits heat and physical changes
5. Physical changes when sucrose dissolves in water
6. The alcohol in the thermometer expands when heated and undergoes physical changes.
1. Among the following properties, which are physical properties ( ) and which are chemical properties ( )
A. Magnesium has a silvery white luster
B. Magnesium ribbon can burn
C. Iron can rust in humid air
D. Copper oxide is a black solid
E. Water will boil at 100℃
"The candle will burn, the candle is burning", the text refers to the candle's ( )
A. The former refers to chemical changes, while the latter refers to chemical properties.
B. The former refers to chemical properties, while the latter refers to chemical changes.
C. The former refers to physical changes, while the latter refers to chemical properties.
D. The former refers to physical changes, while the latter refers to chemical changes
Physical properties and chemical properties PPT, the third part: summary
Physical change When matter changes, no new matter is created.
Chemical changes: new substances are produced after changes in substances
Difference: Whether new substances are generated or not
Connection: Chemical changes are often accompanied by physical changes, such as luminescence, heat release, discoloration and other phenomena.
Physical properties Properties that can be expressed without chemical changes
Color, state, odor, melting point, boiling point, hardness, density,
Solubility, ductility, electrical conductivity, thermal conductivity, etc.
Chemical properties Properties that are only expressed in chemical changes
Flammability, acidity, alkali, corrosiveness, etc.
Difference: whether it manifests itself in chemical changes.
Physical properties and chemical properties PPT, Part 4: Test your skills
1. Which of the two changes in each of the following groups are chemical changes ( )
A. Evaporation of alcohol and burning of alcohol
B. The candle melts when heated. The candle burns.
C. Charcoal burns and steel rusts
D. Steel ingots are rolled into steel and food rots
2. Which of the following poems only involves physical changes ( )
A. Wildfires never burn out, but the spring breeze blows them again
B. Spring silkworms will not run out of silk until they die, and candles will not dry up until their tears turn to ashes.
C. As long as you work hard, an iron pestle can be ground into a needle
D. The sound of firecrackers marks the end of the year, and the spring breeze brings warmth to Tusu
Keywords: Zhejiang Education Edition seventh grade science PPT courseware free download, physical properties and chemical properties PPT download, .PPT format;
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"Physical Properties and Chemical Properties" PPT download:
"Physical Properties and Chemical Properties" PPT Download Part One Content: Class Questions Question: There are two bottles of gas, one of which is oxygen (O2) and one of which is carbon dioxide (CO2). Is there any way you can distinguish them? (The more methods, the better) Oxygen (O2..
"Physical Properties and Chemical Properties" PPT:
"Physical Properties and Chemical Properties" PPT Part 1: Reading materials and answering questions: What describe the changes in natural gas? Natural gas is the world's third largest energy source after coal and oil. Mainly found in oil field gas, gas field gas, coal bed methane, mud fire...
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Update Time: 2024-07-01
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