What is the volume formula of trapezoidal cylinder? It's just that the circles at the top and bottom of the cylinder are different

What is the volume formula of trapezoidal cylinder? It's just that the circles at the top and bottom of the cylinder are different

It should be a round platform V=1/3（s+√ss' +s'）h
Where s' is the area of the top and bottom of the platform, s is the area of the bottom of the platform, and H is the height of the platform

The volume formula of cylinder
Cylinder formula

Cylinder volume = base area * height
The two parts are inserted together to form a cuboid, which is calculated by cuboid volume formula;

Volume calculation formula of hollow cylinder
How to calculate the volume of a hollow cylinder?

(outer circle area inner circle area) * height
Circle area formula: Pie * radius square

The literal expression of Chemistry
The literal expression of making smoke bomb

Phosphorus + oxygen = ignition = phosphorus pentoxide

Well, who can tell me how to write chemical change literal expression?
Complete the text expression of the following chemical changes
1. Decomposition of hydrogen and oxygen carbonate
2. The decomposition of aeruginosa
3. Diamond burns in oxygen
4. Sulfur burns in oxygen
5. Magnesium burns in air

The left side of the arrow is the name of the substance participating in the reaction, and the right side is the name of the product. When there are multiple reactants or products, use the plus sign to connect them. The reaction conditions are written above and below the arrow
1. Hydrogen and oxygen carbonate is heated → ammonia + carbon dioxide + water
. green (heating) → copper oxide + carbon dioxide + water
3. Diamond + oxygen (ignition) → carbon dioxide
4. Sulfur + oxygen (ignition) → sulfur dioxide
5. Magnesium + oxygen (ignition) → magnesium oxide

On chemical literal expressions
Sulfur + oxygen = phosphorus + oxygen = iron + oxygen = carbon dioxide + calcium hydroxide=

Sulfur + oxygen = (ignition) = sulfur dioxide
Phosphorus + oxygen = = (ignition) = phosphorus pentoxide
Iron + oxygen = = (ignition) = Fe3O4
Carbon dioxide + calcium hydroxide = = = calcium carbonate + water

What is the difference between chemical literal expression and chemical expression?

Chemical literal expression refers to the expression of reaction in words, and chemical expression refers to the expression of chemical symbols. For example, for the reaction of electrolyzing water, the literal expression is power on
Water -- hydrogen + oxygen
The chemical expression is electricity
H2O-------H2+O2
The arrow will not be replaced by a straight line

: the decomposition reaction with water formed

2h2o2 = = = 2H2O + O2 ↑ (MnO2 as catalyst)
Text: hydrogen peroxide is heated to produce water and oxygen

According to the requirements, write the text expression of chemical reaction
(1) Black solid turns into gas
(2) Combustion with Mars emission
(3) The reaction of forming three substances
(4) A reaction in which a solid gradually dissolves to produce a gas

1. The black solid is generally C
C + O2 = ignition = CO2
2.3fe + 2O2 = ignition = Fe3O4 (ignition in pure oxygen)
3.2KMnO4=△=K2MnO4+MnO2+O2↑
4.2Na2O2+2H2O=4NaOH+O2↑

What are the chemical expressions of junior three?

In fact, in general, junior high school chemistry expressions are very simple
1、 Literal expression
light
Paraffin + oxygen --- → carbon dioxide + water
heating
Mercury + oxygen --- mercury oxide
heating
Mercury oxide --- → mercury + oxygen
light
Carbon + oxygen --- → carbon dioxide
light
Red phosphorus + oxygen --- phosphorus pentoxide
light
Sulfur + oxygen --- sulfur dioxide
light
Iron + oxygen - - → ferric oxide
Hydrogen peroxide -- manganese dioxide - → water + oxygen
manganese dioxide
Potassium chlorate -------- → potassium chloride + oxygen
heating
heating
Potassium permanganate --- → potassium permanganate + manganese dioxide + oxygen
light
Paraffin + oxygen --- → carbon dioxide + water
2、 Symbolic expression
heating
2Hg+O2------→2HgO
heating
2HgO-----→2Hg+O2
light
C+O2------→CO2
light
P+O2-----→P2O2
light
S+O2---→SO2
light
Fe+O2-----→Fe3O4
MnO2
H2O2---→H2O+O2
MnO2
KClO3-------→KCl+O2
heating
heating
KMnO4-----→K2MnO4+MnO2+O2
3、 Chemical equation
heating
2Hg+O2------→2HgO
heating
2HgO-----→2Hg+O2
light
C+O2------→CO2
light
4P+5O2-----→2P2O5
light
S+O2---→SO2
light
3Fe+2O2-----→Fe3O4
MnO2
2H2O2---→2H2O+O2
2kclo3 --- MnO2 --- heating - → 2KCL + 3O2
heating
2KMnO4-----→K2MnO4+MnO2+O2
4
Under normal temperature and pressure, O2 is colorless and odorless, which has active chemical properties and supports combustion and respiration
C black solid, stable chemical properties at room temperature, combustible at high temperature or ignition, reductive, can reduce metal oxides (similar to H2, CO chemical properties)
Fe pure iron, white solid, common alloy of iron (pig iron and steel) can burn in oxygen to form black solid, and rust in air with water and oxygen
S light yellow powder, light blue burning in air, blue violet flame in oxygen (pay attention to the difference between light and flame)
CO2
Under normal temperature and pressure, colorless and odorless gas, solid called dry ice, the main greenhouse gas (greenhouse gas and CH4), but not pollutants (this point should be noted);
Chemical properties: can not burn, does not support combustion (junior high school stage to master this point)
It reacts with clarified lime water to form CaCO3 precipitation
It reacts with water to form carbonic acid
Reaction with C to form CO (endothermic reaction)
Red phosphorus is dark red, combustible, and forms phosphorus pentoxide solid, so there is white smoke, and phosphorus pentoxide is toxic
Potassium permanganate: dark red solid, red when dissolved in aqueous solution, potassium fertilizer,
Oxygen is decomposed after heating, which belongs to one of the drugs for making oxygen in laboratory
Unit: solid + solid heating gas unit
Manganese dioxide: black solid, insoluble in water
Junior high school stage as long as we know that it is potassium manganate and hydrogen peroxide reaction catalyst
Hydrogen peroxide: hydrogen peroxide solution, colorless liquid, easy to decompose under light, and decomposes into oxygen under the catalysis of manganese dioxide catalyst
Device: solid + liquid gas device
Potassium chlorate: white solid, soluble in water, potassium fertilizer,
Oxygen is decomposed after heating, which belongs to one of the drugs for making oxygen in laboratory
Unit: solid + solid heating gas unit
Potassium chloride: white solid, soluble in water, potassium fertilizer
For reference only, please refer to Baidu for details