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3 years ago

Which two structures would provide a positive identification of a plant cell under a microscope

Chemistry

2 answers:

katovenus [111]3 years ago

7 0

Lysosome, central vacuole

Talja [164]3 years ago

4 0

Chloroplast, large central vacuole

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UkoKoshka [18]

Radio waves, radios

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3 years ago

Nitrogen (N) has an atomic number of 7 and an atomic mass of 14. Which of the following correctly shows the electron arrangement

bonufazy [111]

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2, 5

Explanation:

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3 years ago

Read 2 more answers

A combustion reaction will always be associated with a change in entropy that will be:________.

Alex Ar [27]

Answer:

Option (A) : Positive

Explanation:

A combustion reaction will always be associated with a change in entropy that is Positive due to the gaseous products released. Hence, there is a large positive entropy change.

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3 years ago

An article in a magazine denies that Earth is warming and climate change is occurring. The writer reports that this season was t

ivann1987 [24]

First off, you should be looking at the whole world, not just the northeastern US. Are other regions warming? Can you provide proof that simply because the northeast received a lot of snow and low temperatures, climate change is not a viable theory?

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3 years ago

The tosylate of (2R,3S)-3-phenylbutan-2-ol undergoes an E2 elimination on treatment with sodium ethoxide. Draw the structure of

andrezito [222]

Answer:

(R)-but-3-en-2-ylbenzene

Explanation:

In this reaction, we have a very strong base (sodium ethoxide). This base, will remove a hydrogen producing a double bond. We know that the reaction occurs through an E2 mechanism, therefore, the hydrogen that is removed must have an angle of 180º with respect to the leaving group (the "OH"). This is known as the anti-periplanar configuration.

The hydrogen that has this configuration is the one that placed with the dashed bond (red hydrogen). In such a way, that the base will remove this hydrogen, the "OH" will leave the molecule and a double bond will be formed between the methyl and the carbon that was previously attached to the "OH", producing the molecule (R) -but-3- en-2-ylbenzene.

See figure 1

I hope it helps!

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3 years ago