CN112309212A

CN112309212A - Device for demonstrating concept related to redox reaction

Info

Publication number: CN112309212A
Application number: CN202011256957.4A
Authority: CN
Inventors: 曹广雪
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-02-02
Anticipated expiration: 2040-11-11
Also published as: CN112309212B

Abstract

The invention relates to a teaching aid, in particular to a device for demonstrating relevant concepts of redox reactions, which consists of a magnetic bottom plate, a beam, an organic glass cylinder, a ball and an organic glass round tube, wherein the center of the magnetic bottom plate is provided with a central hole, the upper half part of the left side is provided with an arc-shaped motor track hole, the lower half part is provided with a battery box hole and a speed regulator hole, and a magnetic nameplate is attracted on the magnetic bottom plate; the crossbeam is connected with the central perforated shaft through a bearing, the left side of the crossbeam is provided with a perforated hole as a motor storage place, the right side of the crossbeam is connected with a counterweight rod, and the counterweight rod is provided with a counterweight block capable of moving left and right. The invention has simple structure, can visualize and concretize abstract chemical theory and has obvious phenomenon; the students can understand and experience the changes of the oxidizing agent and the reducing agent in the aspects of electron gain and loss and valence rise and fall, and the routes of the oxidation product and the reduction product in the manual operation, so that the boring knowledge is embodied, the learning interest of the students is increased, and the like.

Description

Device for demonstrating concept related to redox reaction

Technical Field

The invention relates to a chemical teaching demonstration device, in particular to a device for demonstrating concepts related to redox reaction.

Background

In chemical teaching of middle school, it is necessary to learn redox reaction. The key point of high-school chemistry is also the difficulty of redox reaction, the nature and characteristics of redox are what is an oxidant and a reducer, what is an oxidation product and a reduction product, how redox is relatively large and small, a series of knowledge points and concepts are often hidden from beginners, and understanding of the concepts is the core of learning redox. On the basis of learning the concepts, special attention is paid to the connection between the concepts, and the understanding of the concepts by description is not beneficial to the learning of students. Wherein the relationship between the oxidant, reductant, oxidation product, reduction product and gain-and-loss electrons and valence rise-and-fall is the most difficult for students to remember and understand. How to let students better master the concepts and the relations among them, teachers, teaching materials and teaching and assistant materials all take much thought, but the effect is not satisfactory. How to make the concepts root in the mind of students better and how to remember and understand the troublesome concepts and whether to display the concepts by using physical models is not tried at present.

There are no corresponding teaching aids and demonstration devices.

Disclosure of Invention

The invention mainly aims at the defect that no physical model is used for displaying the related concepts of the redox reaction, and provides a special instrument model, the related concepts of the redox reaction are displayed in a model mode, students can experience the interest of learning in manual operation, and the changes of the related concepts and the relationship between the related concepts are memorized and understood in practice, so that the effect of getting twice the result with half the effort is achieved.

The technical scheme adopted by the invention to solve the technical problems is as follows: the device for demonstrating relevant concepts of redox reactions comprises a magnetic bottom plate, a cross beam, an organic glass cylinder, a ball and an organic glass round tube, wherein the center of the magnetic bottom plate is provided with a central hole, the upper half part of the left side of the magnetic bottom plate is provided with an arc-shaped motor track hole, the lower half part of the magnetic bottom plate is provided with a battery box hole and a speed regulator hole, and a magnetic nameplate is attracted to the upper surface of the magnetic bottom plate; the crossbeam is connected with the central perforated shaft through a bearing, the left side of the crossbeam is provided with a perforated hole as a motor storage place, the right side of the crossbeam is connected with a counterweight rod, and the counterweight rod is provided with a counterweight block capable of moving left and right.

Preferably, the organic glass cylinder is a cylinder pipe cut by an organic glass round pipe with the radius difference slightly larger than a sphere and the thickness of 1 mm.

Further, a motor is fixed at a motor storage position on the left side of the cross beam, and the motor is connected with a motor connecting position through insertion; an organic glass cylinder is fixed on the non-transparent disk, the organic glass cylinder is a concentric cylinder with the radius difference slightly larger than the round ball and the height slightly larger than the round ball, the center of the concentric cylinder is fixed with a motor joint, two round balls are fixed in the first loop in an axial symmetry manner, eight round balls are uniformly distributed and fixed in the second loop, and a baffle plate is bonded between the non-transparent disk and the organic glass disk in the third loop; the non-transparent disk, the three organic glass cylinders with the radius difference slightly larger than the round ball and the organic glass disk jointly form a cylinder without a surrounding barrier in a third loop.

Furthermore, the two sides of the organic glass round tube are welded with organic glass cylinders with notches, the organic glass cylinder with the notch on the right side, the non-transparent disk, the three organic glass cylinders with the radius difference slightly larger than the round ball and the organic glass disk form a cylinder together; two round balls are symmetrically fixed in the first circular path of the cylinder, eight round balls are uniformly distributed and fixed in the second circular path, eight round balls are uniformly distributed in the third circular path, seven of the round balls are fixed, and one round ball can freely move in the third circular path and the organic glass round tube.

Further, crossbeam and organic glass pipe pass through the rubber band and fix into a whole, confirm bearing position and whole focus coincidence as far as possible according to the whole quality relation of motor and right side cylinder, can adjust the balance through the balancing weight during the use.

And furthermore, the primary battery, the speed regulation switch and the motor are electrically connected in sequence through a lead, and a wavy conductive wire with adjustable length is selected between the motor and the speed regulation switch.

Compared with the existing teaching mode, the teaching device has the advantages that the structure is simple, the abstract chemical theory can be visualized and concretized, and the phenomenon is obvious; the students can understand and experience the changes of the oxidizing agent and the reducing agent in the aspects of electron gain and loss and valence rise and fall, and the routes of the oxidation product and the reduction product in the manual operation, so that the boring knowledge is embodied, the learning interest of the students is increased, and the like.

Drawings

Fig. 1 is a schematic diagram of a first layer of the present invention.

Fig. 2 is a schematic diagram of the connection of a first layer and a second layer of the present invention.

Fig. 3 is a schematic view of the partial attachment of the first, second and third layers of the present invention.

Figure 4 is a partial schematic view of a third layer of the present invention.

Fig. 5 is a schematic view showing an initial state of the integral bonding of the present invention.

Fig. 6 is a schematic view of the final state of the integral connection of the present invention.

Fig. 7 is a circuit diagram of the present invention.

In the figure: 1. magnetic bottom plate, 2, motor track trompil, 3, central trompil, 4, battery case trompil, 5, speed regulator trompil, 6, magnetism data plate, 7, crossbeam, 8, counterweight rod, 9, balancing weight, 10, bearing, 11, motor storage department, 12, opaque disc, 13, organic glass cylinder, 14, ball, 15, motor junction, 16, baffle, 17, jagged organic glass cylinder, 18, organic glass pipe, 19, organic glass disc, 20, rubber band.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

The device for demonstrating relevant concepts of redox reactions comprises a magnetic bottom plate 1, a cross beam 7, an organic glass cylinder 13, a ball 14 and an organic glass round tube 18, wherein the center of the magnetic bottom plate 1 is provided with a central opening 3, the upper half part of the left side is provided with an arc-shaped motor track opening 2, the lower half part is provided with a battery box opening 4 and a speed regulator opening 5, and a magnetic nameplate 6 is attracted to the upper surface of the magnetic bottom plate 1; the magnetic nameplate 6 is printed with a character of 'reducing agent losing oxygen and oxidant getting lower and returning', the beam 7 is connected with the central opening 3 through the bearing 10, the left side of the beam 7 is provided with an opening as a motor storage part 11, the right side of the beam is connected with the counterweight rod 8, and the counterweight rod 8 is provided with a counterweight 9 which can move left and right.

A motor is fixed at a motor storage part 11 on the left side of the cross beam 7 and is connected with a motor connecting part 15 through insertion; an organic glass cylinder 13 is fixed on the non-transparent disc 12, the organic glass cylinder 13 is a concentric cylinder with the radius difference slightly larger than the round ball 14 and the height slightly larger than the round ball 14, a motor joint 15 is fixed at the center of the concentric cylinder, two round balls 14 are fixed in the first loop in an axial symmetry manner, eight round balls 14 are uniformly distributed and fixed in the second loop, and a baffle 16 is bonded between the non-transparent disc 12 and the organic glass disc 19 in the third loop; the opaque disk 12, the three plexiglas cylinders 13 with radii slightly different from the round ball 14 and the plexiglas disk 19 together form a cylinder without a barrier in the third circuit. The beam 7 and the organic glass round tube 18 are fixed through a rubber band 20; the primary battery, the speed regulating switch and the motor are electrically connected in sequence through leads.

The reducing agent is exemplified by sodium metal, and the oxidizing agent is exemplified by chlorine gas. The device is connected according to fig. 5. Two round balls 14 are symmetrically fixed in the first ring channels at two sides, eight round balls 14 are uniformly distributed and fixed in the second ring channel, seven round balls 14 are distributed in the third ring channel at the right side, and the right side shows that seventeen electrons are arranged at the periphery of a chlorine atom. A sphere 14 is placed in the third ring on the left, which shows eleven electrons around the sodium atom. The left and right sides are made to be in a horizontal state by adjusting the counter weight 9 in advance. When the device is used, the speed regulating switch is turned on, the left disc rotates, the round balls 14 in the peripheral third ring channel rotate along with the pushing of the baffle plate 16, the left disc rotates fast along with the rotation of the speed regulating switch, the round balls 14 in the third ring channel enter the organic glass circular tube 18 under the action of centrifugal force, the balance of the whole device is broken, the left side is high and the right side is low, the round balls 14 enter the right side from the left side, electrons representing the outermost layer of sodium atoms are transferred to the atoms, the speed regulating switch is turned off, the magnetic nameplate 6 which is placed under the sodium and chlorine atoms in advance is exposed, and the change of a reducing agent, namely the loss of yang, namely the loss of electrons, the increase of valence, the oxidation reaction and the oxidation to oxidation products can be taught to students; similarly, the right side represents the change of the chlorine element of the oxidant, namely the reduction, namely the electron is obtained, the valence is reduced, the reduction reaction is carried out, and the reduction product is obtained. By analogy, the number of electrons can be changed to display different reducing agents and oxidizing agents.

In conclusion, the device can be used for showing and enlightening the concepts of the reducing agent, the oxidizing agent, the oxidation product and the reduction product on the teaching material, so that students can deepen the understanding of abstract concepts in manual operation, and the interestingness is increased.

The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. Redox reaction is concept presentation device about, comprises magnetism bottom plate (1), crossbeam (7), organic glass cylinder (13), ball (14) and organic glass pipe (18), its characterized in that: the center of the magnetic bottom plate (1) is provided with a central hole (3), the upper half part of the left side is provided with an arc-shaped motor track hole (2), the lower half part is provided with a battery box hole (4) and a speed regulator hole (5), and a magnetic nameplate (6) is attracted to the upper surface of the magnetic bottom plate (1); the beam (7) is connected with the central opening (3) through a bearing (10), the left side of the beam (7) is provided with an opening as a motor storage part (11), the right side of the beam is connected with a counterweight rod (8), and the counterweight rod (8) is provided with a counterweight block (9) which can move left and right.

2. The redox-related concept demonstration apparatus according to claim 1, wherein: a motor is fixed at a motor storage part (11) on the left side of the cross beam (7), and the motor is connected with a motor connecting part (15) through insertion; an organic glass cylinder (13) is fixed on the non-transparent disc (12), the organic glass cylinder (13) is a concentric cylinder with the radius difference slightly larger than the round ball (14) and the height slightly larger than the round ball (14), a motor joint (15) is fixed at the center of the concentric cylinder, two round balls (14) are symmetrically fixed in the first loop, eight round balls (14) are uniformly distributed and fixed in the second loop, and a baffle plate (16) is bonded between the non-transparent disc (12) and the organic glass disc (19) in the third loop; the non-transparent disk (12), the three organic glass cylinders (13) with the radius difference slightly larger than that of the round ball (14) and the organic glass disk (19) jointly form a cylinder without a surrounding block in a third loop.

3. The redox-related concept demonstration apparatus according to claim 1, wherein: two sides of the organic glass round tube (18) are welded with organic glass cylinders (17) with notches, the organic glass cylinder (17) with the notches on the right side, the non-transparent disc (12), the three organic glass cylinders (13) with the radius difference slightly larger than that of the round ball (14) and the organic glass disc (19) jointly form a cylinder; two round balls (14) are symmetrically fixed in a first ring of the cylinder, eight round balls (14) are uniformly distributed and fixed in a second ring, eight round balls (14) are uniformly distributed and fixed in a third ring, seven of the round balls (14) are fixed, and one round ball (14) can freely move in the third ring and an organic glass round tube (18).

4. The redox-related concept demonstration apparatus according to claim 1, wherein: the beam (7) and the organic glass round tube (18) are fixed through a rubber band (20).

5. The redox-related concept demonstration apparatus according to claim 1, wherein: the primary battery, the speed regulating switch and the motor are electrically connected in sequence through leads.