Unit 1 Into the World of Chemistry Knowledge Sorting 1. What is chemistry?

(1) Turbidity; Burn; Not; Gas; Burn;

3) cloudiness; Not water vapor; The white substance is small particles of paraffin; Carbon dioxide on white matter (4) small particles of paraffin wax on white matter.

5) The carbon dioxide generated by the previous combustion has not been dissipated, resulting in the clarified lime water becoming turbid, do not understand, welcome to ask for help!

[Collecting evidence] (1) Recall the existing knowledge: CO2 is a colorless gas, which can make the clarified lime water [turbid] and cannot be [burned]; Water vapor is a [none] colored [liquid] body; Paraffin wax is a white solid that can be burned.

2) Check the relevant information: smoke is formed by solid particles, and fog is formed by small droplets. The melting and boiling points of paraffin wax are very low, and it is easy to vaporize and liquefy.

3) Experiment**: Blow out the candle and immediately cover the white smoke with a beaker coated with clarified lime water on the inner wall, and the clarified lime water [becomes cloudy]. Xiaoliang concluded that the white smoke was CO2.

Blow out the candle and immediately place a piece of dry and cold glass on top of the white smoke, on which no water mist appears. Xiaoguang concludes that the white smoke is not [water vapor]. Blowing out the candle and immediately lighting the white smoke with a dyed wooden strip, it is found that the candle has been re-lit, indicating that the white smoke is flammable, which provides evidence for Xiao Ming's hypothesis, and can also rule out the hypothesis of Xiao Guang.

Conclusion and Explanation] (4) From the above **, it can be seen that [Xiao Ming]'s conjecture is correct. (5) Xiao Liang did see that the lime water had become turbid during the experiment, and the reason was that [carbon dioxide was produced by candle burning].

Fill in the blanks in order: turbidity Combustion Colorless gas Combustion Turbidity Water vapor White smoke is white smoke is a paraffin solid particle condensed by paraffin vapor Carbon dioxide Xiao Ming The burning of candles produces carbon dioxide.

Unit 1 Chemistry Changed the World Section 1 Wonderful Town Chemistry.

Main content 1Feel the important role of chemistry in promoting social development and improving the quality of human life. Initially establish the ambition of learning chemistry for the rejuvenation of the nation and the progress of society.

2.Recognize physical changes and the basic characteristics of chemical changes, stimulate curiosity and desire for chemical phenomena, and improve interest in learning chemistry.

3.Knowing that the matter of Mifulu is composed of molecules, atoms, and other particles, the concept of particles composed of matter is initially formed.

4.Initially establish a way of thinking that links macro and micro.

5.Understand the two sides of chemistry and initially establish a green chemistry concept.

Key Points 1Physical changes, chemical changes.

Chemical changes: There are new substances that are born in the hall.

Physical Changes: No new matter is generated.

2.Change in energy in chemical change.

The use of chemical reactions to obtain useful substances or obtain energy is the basic purpose of human chemical research.

3.Green Chemistry.

4.The mystery of chemical change.

5.Elements and the periodic table.

(1) Water is composed of hydrogen and oxygen, so fill in: hydrogen and oxygen;

2) Carbon dioxide is composed of carbon dioxide molecules, so fill in: carbon dioxide molecules;

3) Calcium hydroxide can make the phenolphthalein solution red, indicating that it is alkaline, so fill in: alkali;

4）2co+o2

Ignite2co2

A. 56gco to participate in the reaction, then the mass of O2 consumed must be 32g, correct;

b. 16go2 participates in the reaction, then the mass of CO2 must be 44g, correct;

c. If 10 GCO2 is generated, the sum of the consumed CO and O2 must be 10 GW, which is correct;

d. If 5GCO® is mixed with 2GO2 and ignited, the mass of CO2 generated is incorrect;

Therefore, fill in: d