"Simple Calculation Using Chemical Equations" Chemical Equations PPT Courseware 2

Description

"Simple Calculation Using Chemical Equations" Chemical Equations PPT Courseware 2

learning target

1. On the basis of understanding the meaning of chemical equations, master the calculation of the quantities of reactants and products.

2. Through the calculation of chemical equations, master the writing format of chemical equation calculations, and at the same time cultivate and improve thinking and problem-solving abilities.

Example 1: How many grams of oxygen can be obtained by heating and decomposing 6g of potassium permanganate?

step:

1. Assume unknown quantities

2. Write the chemical equation of the reaction and balance it

3. Write down the relative molecular mass, known quantities, and unknown quantities of relevant substances.

4. Solving column proportional expressions

5. Write the answer concisely

1. Steps to calculate based on chemical equations

(1) Assume the unknown number…………..Assume

(2)Write the chemical equation and balance the equation...

(3) Indicate the amount of relevant substances

superscript relative molecular mass

Subscript known mass and unknown quantity…………subscript

(4) Make a list of proportional expressions and solve the ratio of ………….…..

(5) Write the answer concisely......Answer

Precautions:

⑴. When setting up an unknown quantity, you must pay attention to the mass unit. If the units of the known quantity and the unknown quantity are inconsistent, you must perform unit conversion. The units must be consistent before calculation.

⑵. Pay attention to the balance when writing the equation, and pay attention to the completeness of the equation. Pay attention to the symbols of reaction conditions, gas and precipitation.

⑶. The relative molecular mass of related substances is written below the corresponding chemical formula. Be sure to multiply the relative molecular mass by the coefficient in front of the chemical formula. The known and unknown quantities are written below the corresponding relative molecular mass.

⑷. The decimal places of the calculation results should be retained according to the requirements in the question. If there is no requirement in the question, one decimal place should generally be retained.

2. Four types of chemical equation calculations:

① Find the mass of the product if the mass of the reactant is known;

② Calculate the mass of the reactants if the mass of the product is known;

③If the mass of one reactant is known, find the mass of the other reactant;

④If the mass of one product is known, find the mass of the other product.

3. Three essentials and three keys to calculating chemical equations.

Three essentials: ① The steps must be complete; ② The format must be standardized; ③ The number must be accurate.

Three keys: ① accurately write chemical formulas; ② balance chemical equations; ③ accurately calculate relative molecular mass.

1. Everyone knows that salt is a common condiment, but do you know? It is also an important chemical raw material. Salt can be used to produce sodium hydroxide, hydrogen and chlorine, etc. The chemical reaction equation is:

2NaCl+ 2H2O energize Cl2 + H2 + 2NaOH

If a factory produces 71kg of chlorine every day, ask:

1. How many kilograms of solid sodium chloride does the plant need at least every day?

2. How many kilograms of sodium hydroxide can be produced at the same time?

2. Raising ornamental fish can cultivate people's sentiments and enhance people's love for life. Ornamental fish shipped by air must be sealed. In order to solve the problem of fish's oxygen absorption, calcium peroxide (CaO2) can be added to the water. Calcium peroxide reacts with water to generate calcium hydroxide - Ca(OH)2 - and oxygen.

(1) Write the chemical equation for the reaction between calcium peroxide and water:

(2) A fish farming enthusiast wants to air transport ornamental fish from Shanghai to Guangzhou. The fish requires 224L of oxygen (density is 1.43g/L) during the entire process. How many grams of calcium peroxide is needed?

(3) It is known that the selling price of calcium peroxide is 0.5 yuan/g. How much does the entire process of air transporting ornamental fish cost?

Precautions:

Chemical equations reflect the mass relationship between pure substances. Therefore, when encountering impurities, the mass of the impure reactants or products must first be

Harvest and Reflection

What knowledge have you gained from studying this lesson?

Is there anything to gain?

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"Simple Calculation Using Chemical Equations" Chemical Equations PPT Courseware 6:

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Update Time: 2024-10-02

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 1 industry PPT template

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