"Simple Calculation Using Chemical Equations" Chemical Equations PPT Courseware 4

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"Simple Calculation Using Chemical Equations" Chemical Equations PPT Courseware 4

Review questions:

1. Do you know the meaning of chemical equations?

(1), indicating the reactants, products and reaction conditions.

(2), represents the ratio of the number of particles between reactants and products.

(3), represents the mass ratio between reactants and products.

Summarize the rules:

In a chemical reaction, the mass ratio between reactants and products is related to _____.

Therefore, using this proportional relationship, the mass of one reactant (or product) can be used to calculate the mass of another product (or reactant) according to the chemical equation.

Notes on calculations based on chemical equations:

(1) Do not bring units when assuming unknown quantities

(2) Write the chemical equation correctly (pay attention to balance)

(3) Write the relative molecular mass, known quantity, and unknown quantity of the relevant substance (write it directly below the corresponding chemical formula. Write the relative molecular mass first. Be sure to multiply the relative molecular mass by the coefficient in front of the chemical formula, and then write the mass. ;The mass unit must be written and unified.)

(4) List the proportional formula and solve it (the calculation results are carried out according to the requirements in the question. If there is no requirement in the question and the division cannot be completed, keep one decimal place)

(5) Write the answer concisely

2. If the mass of the product is known, find the mass of the reactant.

Example 2: In industry, quicklime (CaO) and carbon dioxide can be produced by calcining limestone (CaCO3) at high temperature. If 10 tons of calcium oxide is to be produced, how many tons of calcium carbonate are needed?

Exercise 3: After adding manganese dioxide to the solution of "green oxidant" hydrogen peroxide (H2O2), a large amount of oxygen can be produced at room temperature. How many grams of pure hydrogen peroxide will be consumed to produce 48g of oxygen?

3. Calculation of impure reactants or products.

1. In the chemical reaction equation, whether it is a reactant or a product, the mass of the pure substance is substituted. If you encounter impure reactants or products, the impure substance should be converted into the mass of the pure substance.

2. Conversion between the mass of impure substances and pure substances.

Mass of pure substance = Mass of impure substance × Purity (mass fraction)

Summary: Things to note when calculating chemical equations

【Three essentials】

(1) The steps must be complete (assume, write, calculate, mark, list, solve, and answer);

(2) The format must be standardized;

(3) The units must be unified and the calculations must be accurate (usually 1 decimal place is retained);

【Three keys】

(1) Write chemical equations accurately;

(2) Accurately calculate relative molecular mass;

(3) The quantities substituted refer to the mass of the pure substance (the unit must be substituted into the calculation process);

Four types of calculations based on chemical equations

1. Find the mass of the product if the mass of the reactants is known.

2. If the mass of the product is known, find the mass of the reactant.

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

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

Class exercises

1. Hydrogen burns in chlorine to form hydrogen chloride gas. How many grams of chlorine are needed to burn 100g of hydrogen? How many grams of hydrogen chloride gas are produced? (Cl-35.5)

2. Use hydrogen to reduce copper oxide to produce copper in the laboratory. If 3.0g of copper is produced, what mass of copper oxide is required?

3. Zinc reacts with hydrochloric acid (HCl) to produce hydrogen gas and zinc chloride. If 3.7g of zinc is reacted with a sufficient amount of hydrochloric acid in the laboratory, what is the mass of hydrogen and zinc chloride that can be produced? (Zn-65, Cl-35.5)

Communication and expression:

After studying this course, what have you learned and inspired?

1. In chemical equations, if you know the mass of the reactant (or product), you can use the mass ratio between substances to calculate the mass of the product (or reactant).

2. The calculation format using chemical equations must be standardized.

3. The calculation of chemical equations can enhance production planning and facilitate the rational use of resources.

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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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