Question

Воздух –природная смесь газообразных веществ. Укажите качественный и количественный состав чистого атмосферного воздуха (вещества и их процентное содержание). ______ Ученик установил и зажег две свечи. Первую свечу он оставил без изменений, а вторую -плотно накрыл стеклянной банкой. Первая свеча продолжала гореть. Вторая свеча потухла. Банка запотела.(a)Почему первая свеча продолжала гореть? Что необходимо для горения?

Answer 1

1)Азот – 78,9 процента; - кислород – 20,95 процента; - двуокись углерода – 0,3 процента
2)Для горения необходим кислород,который не попадает сквозь банку.

Answer 2

Qualitative and Quantitative Composition of Pure Atmospheric Air

Atmospheric air is a natural mixture of various gases. The qualitative and quantitative composition of pure atmospheric air can be summarized as follows:

1. Nitrogen (N2): Nitrogen is the most abundant gas in the atmosphere, constituting approximately 78% of the total volume of air. 2. Oxygen (O2): Oxygen is the second most abundant gas in the atmosphere, making up about 21% of the total volume of air. 3. Argon (Ar): Argon is present in trace amounts, accounting for approximately 0.93% of the atmosphere. 4. Carbon Dioxide (CO2): Carbon dioxide is a greenhouse gas and is present in very small quantities, making up about 0.04% of the atmosphere. 5. Neon (Ne): Neon is present in trace amounts, constituting approximately 0.0018% of the atmosphere. 6. Helium (He): Helium is also present in trace amounts, making up about 0.0005% of the atmosphere. 7. Methane (CH4): Methane is a greenhouse gas and is present in very small quantities, accounting for approximately 0.00018% of the atmosphere. 8. Hydrogen (H2): Hydrogen is present in trace amounts, constituting about 0.00005% of the atmosphere. 9. Ozone (O3): Ozone is present in trace amounts, making up about 0.000004% of the atmosphere.

These percentages represent the approximate composition of pure atmospheric air. It's important to note that the composition can vary slightly depending on factors such as location, altitude, and pollution levels.

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