A physics experiment in junior high school, what physics experiments are there in middle school

1.Because hydrogen ignites in an impure condition, it is required to introduce pure hydrogen first;

2.If you don't use hydrogen, the air will enter the test tube, and the reduced copper will be oxidized again when it encounters oxygen in the air, and your experiment will be considered a failure.

This is an experiment in which hydrogen reduces copper oxide.

Both operations are related to the nature of hydrogen.

1: Pure hydrogen can ignite, burn quietly in the air, and emit a pale blue flame, but if the hydrogen is not pure, it can occur when ignited or heated**.

2: Hydrogen is highly reducible.

In this experiment, the first step of hydrogen gas is to discharge the air in the tube, ensure the purity of the hydrogen in the tube during heating, and prevent the mixing of hydrogen and air during heating. until the black oxide copper turns red copper.

The second part of hydrogen is because the alcohol lamp has just been removed, the test tube is still hot, and the copper is easy to be oxidized under high temperature conditions, so the use of hydrogen reductivity to protect copper, it is necessary to continue to introduce hydrogen to cool to room temperature to prevent the generated copper from being oxidized by oxygen in the air again.

Got it?

The purpose of the first introduction of hydrogen is to expel the air in the test tube and prevent the mixing of hydrogen and air during heating**. It is then heated until the appearance of red powdered copper.

After the reaction stops and the alcohol lamp is extinguished, hydrogen is continued to be introduced until it has cooled to room temperature, in order to prevent the generated copper from being oxidized again by oxygen in the air.

High School Physics Experiments:

1 The parallelogram rule of verification force.

2. Study the linear motion of uniform variable speed.

3 Study of planar endosomal motion.

4. Verify the law of conservation of mechanical energy.

5 Verify the law of conservation of momentum.

6 Measure g with a single pendulum

7 Molecular size estimation by the oil film method.

8 The tracing method draws the electric field isopotential line.

9 Depicting the voltammetry curve of a small bulb.

10 Measure metal resistivity.

11 Ammeter Retrofit Voltmeter.

12. Measure the internal resistance and electromotive force of the power supply.

13. Use a multimeter to determine the electrical components in the black box.

14 Sensors for simple application.

15 Determination of the refractive index of glass.

16 Observe single-slit interference with vernier calipers.

Of course, there are some common tools to use:

Vernier calipers, spiral micrometers, spring dynamometers, balances, stopwatches, dot timers, and oscilloscopes should be able to read and analyze the causes of errors and how to avoid them.

To put it simply, gravitational forces, momentum, acceleration (this is important), and then there's electromagnetism, which some schools don't do conditionalization.

1. Spring deformation drops Hooke's law. 2. Free fall. 3 Newton's Laws. Wait a minute.

Guangzhou Xiaoxiaoxian.

There are many experiments in junior high school physics, including thermal, acoustic, optical, and electrical. Mechanics experiments.

During the high school entrance examination, the key experiments are the plane mirror imaging in optics, the convex lens imaging, and the reflection law of light.

There are many key experiments in mechanics, such as kinetic energy. Factors influencing gravitational potential energy, influencing factors of pressure, influencing factors of friction. Characteristics of liquid pressure.

Measurement of atmospheric pressure. Measurement of mechanical efficiency, measurement of power. Electrical experiments include the law of current and voltage of series-parallel circuits.

The electrical power of the small bulb is measured by the resistance measurement. **Factors influencing the size of the resistance. Experiments with hot blood include the melting of crystals, the boiling of water, and the measurement of specific heat capacity.

and Joule's Law verification.

(1) Prevent heat loss and shorten the heating time.

2) The volume becomes larger (the depth is constantly decreasing, and the pressure is constantly decreasing) (3) Because the specific heat of the container is less than the specific heat of the water, absorbing the same heat, the temperature of the container is higher, so there is a temperature difference between the water and the container after the alcohol lamp is turned off, and the water continues to absorb heat and boil for a period of time.

The watchtower lord adopts!

Measurement of temperature.

Measure the temperature of boiling water.

Use a mechanical stop meter to measure the speed of the trolley.

The law of reflection of light.

Imaging features of plane mirrors.

The law of the lens.

Convex lens imaging features.

Newton's First Law.

Equilibrium conditions for leverage.

Use a spring dynamometer.

The connection method of the pulley block.

Measure the mechanical efficiency of the pulley block.

Archimedes' Law.

Measure the density of an object.

How to use a pallet balance.

Connect the circuit. Connect the voltmeter.

Connect the ammeter.

Measure the resistance of small bulbs.

Series and parallel.

Connection of the rheostat.

** experiment of voltammetry resistance measurement.

**Electrical power experiments with electrical appliances.

Measure the electrical power of a small bulb.

Ampere's left and right hand rule.

**Experiments on factors that affect the magnetic strength of electromagnets.

**Experiments on electromagnetic induction phenomena.

I'm a lot, that's a lot, and if you want to say that you can get the following experimental optics in the high school entrance examination: convex lens imaging.

Mechanics: Lever balanced.

Density: Measure the density of an object (measure the mass and volume, find the ratio) Electricity: voltammetry to measure the resistance, measure the rated power of the small bulb, the relationship between voltage and current, the relationship between resistance and current.

There are not many experiments in junior high school physics, there are no big experiments, they are all small experiments, and the following is an introduction to the experiments in junior high school physics:

Measurement of temperature.

Measure the temperature of boiling water.

Use a mechanical stop meter to measure the speed of the trolley.

The law of reflection of light.

Imaging features of plane mirrors.

The law of the lens.

Convex lens imaging features.

Newton's First Law.

Equilibrium conditions for leverage.

Use a spring dynamometer.

The connection method of the pulley block.

Measure the mechanical efficiency of the pulley block.

Archimedes' Law.

Measure the density of an object.

How to use a pallet balance.

Connect the circuit. Connect the voltmeter.

Connect the ammeter.

Measure the resistance of small bulbs.

Series and parallel.

Connection of the rheostat.

** experiment of voltammetry resistance measurement.

**Electrical power experiments with electrical appliances.

Measure the electrical power of a small bulb.

Ampere's left and right hand rule.

**Experiments on factors that affect the magnetic strength of electromagnets.

**Experiments on electromagnetic induction phenomena.

Middle School Physics Tutoring Network.

Convex lenses image lever circuits.

Test the small bulb resistance, electrical power, which is electrical.