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Lemur [1.5K]
3 years ago
6

Predict what will be observed in each experiment below. A student sees tiny bubbles clinging to the inside of an unopened plasti

c bottle full of carbonated soft drink. The student squeezes the bottle. A. The bubbles will shrink, and some may vanish. B. The bubbles will grow, and more may appear. C. The bubbles won't change. D. I need more information to predict what will happen to the bubbles.
Chemistry
2 answers:
Arisa [49]3 years ago
6 0

Answer:

A.

Explanation:

Squeezing the bottle creates negative pressure inside the bottle because of the plastic's elasticity that will hasten the extraction of the carbon dioxide from the soda.

geniusboy [140]3 years ago
5 0

Answer:

A

Explanation:

The bubbles are formed because the carbonic acid of the soft drink decomposes and forms carbon dioxide gas, which has low solubility in liquids. The decomposition reaction is a reversible reaction:

H₂CO₃(l) ⇄ CO₂(g) + H₂O

When the bottle is shaken, the molecules of the drink became more agitated, so the pressure of it will increase. The increase of pressure in a reversible reaction shifts the equilibrium of the formation of the less gas molecules (Lê Chatelier's Principle). So, the CO₂ will dissolve in liquid, and less bubbles will be seen.

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What is pollen in the reproduction cycle of flowering plants?

A pollen grain is a microspore containing the male gametophyte, usually reduced to two undivided cells, each with one haploid (n) nucleus. These cells are surrounded by a very resistant wall, the exine, which generally has apertures, zones with less resistance which will allow the germination of the pollen tube.

Explanation of the reproduction cycle (cf diagram above)

A given species produces flowers bearing stamens. According to species, these flowers can be unisexual (stamens only) or bisexual (stamens and carpels).

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A pollen grain is aimed at reaching another flower of the same species, bearing carpels. The ovaries contain ovules, in which meiosis occurs, then mitoses. It results in an embryo sac with 8 nuclei, among which an egg cell and 2 central cells. When a pollen grain arrives on another flower (see : How are the spores and pollen grains transported?), it is received by the stigmas.

The pollen grain germinates through an opening of the wall: the vegetative nucleus develops into a pollen tube which is guided by the style to the ovary, then enters the micropyle of an ovule. The pollen tube releases 2 sperm nuclei into the ovule: one of the sperms fuses with the egg cell into a zygote (2n), while the other sperm fuses with central nuclei and gives rise to albumen (= food source). There are generally several ovules in an ovary : each one can be fertilized by a distinct pollen grain.

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