"Properties of Oxygen" Mystery of Air PPT Courseware 3

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"Properties of Oxygen" Mystery of Air PPT Courseware 3

1. Physical properties

1. Color, taste and state:

A gas that is usually colorless and odorless

2. Density: slightly denser than air

3. Solubility: Not easily soluble in water

4. Three-state transformation: under 101kPa

2. Oxygen inspection:

3. Chemical properties

1. Reaction with carbon

Phenomenon:

(1) Burns more vigorously than in air and emits white light

(2) Release heat

(3) Generate a colorless gas that turns clear lime water turbid.

2. Reaction with sulfur

Phenomenon:

(1) Burns in the air and emits a weak light blue flame

Burns in oxygen and emits a blue-violet flame

(2) Release heat

(3) Generate a colorless gas with a pungent odor

Operation precautions:

①The function of a match: to ignite the iron wire.

② Wrap the iron wire into a spiral: increase the heating area of ​​the iron wire.

③When the match is about to burn out, extend the wire into the oxygen bottle:

Prevent matches from consuming too much oxygen and causing the iron wire to fail to burn smoothly.

④Put a small amount of water in the gas collecting bottle in advance or lay a thin layer of fine sand at the bottom of the bottle to prevent the melt from splashing and exploding the bottom of the gas collecting bottle.

In summary:

Oxygen is a gas with relatively active chemical properties. It provides oxygen in oxidation reactions and has oxidizing properties. It is a commonly used oxidant.

practise

1. Which statement about the physical properties of oxygen is correct ( )

A. Very soluble in water

B. Under standard conditions, the density is slightly higher than that of air.

C. It turns into a colorless liquid at -183°C.

D. It turns into a white solid at -218℃

2. It is necessary to remove oxygen from the air in a closed container and prevent it from being mixed with other gases. The combustibles burning in it can be ( )

A. Sulfur powder B. Charcoal

C. Iron wire D. Red phosphorus

3. The simplest way to prove that the gas collecting bottle contains oxygen is ( )

A. What makes candles burn is oxygen

B. Determine the density. If the density is greater than that of air, it is oxygen.

C. Put in wooden sticks with sparks. What can make the wooden sticks re-ignite is oxygen.

D. Add red charcoal and then add clear lime water. The bottle that can make the lime water turbid must be oxygen.

4. Which of the following reactions is a combination reaction ( ), and which one is an oxidation reaction ( )

A. Alcohol + oxygen water + carbon dioxide

B. Zinc + hydrochloric acid zinc chloride + hydrogen

C. Phosphorus + oxygen phosphorus pentoxide

D. Basic copper carbonate water + copper oxide + carbon dioxide

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Update Time: 2024-09-08

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 1 industry PPT template

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