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Galina-37 [17]
2 years ago
13

Some students observe four different lab investigations. The students record their observations in a table.

Chemistry
2 answers:
Sati [7]2 years ago
3 0

Answer:

Number 4 is an example of a chemical reaction

Explanation:

heThe chalk is reacting with the vingear which is creating a new substance. The new substance is the gas that the reaction gives off.

ollegr [7]2 years ago
3 0
I think the number 4 is the right answer
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Explanation:

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This shows that nitric acid (HNO_{3}) is the product formed and it is an acidic substance.

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3 years ago
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Tcecarenko [31]

Answer:

Here's what I get  

Explanation:

1. Complete structural formula

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The complete structural formula is shown below (There is a C atom at each intersection).

2. Condensed structural formula

A condensed structural formula is designed to be typed on one line.

The molecule has three CH₃ groups attached to a single carbon atom, so the condensed structural formula is  

(CH₃)₃CH

The formula is also often written CH₃CH(CH₃)CH₃ and as (CH₃)₂CHCH₃.

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Rus_ich [418]

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