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steposvetlana [31]
4 years ago
11

List four observation that suggest a chemical change is occuring

Chemistry
1 answer:
andrezito [222]4 years ago
8 0
1.) Gas given off
2.) precipitate formed
3.) large amount of heat given off
4.) Color change
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Cells that produce antibodies that help destroy the pathogens are called what
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Antibodies are produced by a type of white blood cell called a plasma cell.
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If a reaction releases 675,000 Joules, how many kcal does it release?
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Answer: If a reaction releases 675,000 Joules then it means it releases 161.328872 kcal.

Explanation:

According to the standard conversion,

1 Joule = 0.000239006 kcal

Therefore, 675,000 Joules will be converted into kcal as follows.

1 Joule = 0.000239006 kcal\\675,000 J = 675000 J \times \frac{0.000239006 kcal}{1 J}\\= 161.328872 kcal

Thus, we can conclude that if a reaction releases 675,000 Joules then it means it releases 161.328872 kcal.

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3 years ago
What is the name of the isomer with this structural formula?
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It has 4 pcs of Carbon (C) and 8 pcs of Hydrogen (H) so the formula is C4H8 - calls Butene.
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4 years ago
0.00632 into a scientific notation
ddd [48]

Answer:

6.32 × 10⁻³

3.2560008× 10⁷

5.630× 10⁰

9.5002× 10¹

Explanation:

Scientific notation is the way to express the large value in short form.

The number in scientific notation have two parts.

The digits (decimal point will place after first digit)

× 10 ( the power which put the decimal point where it should be)

For example:

0.00632

In scientific notation =  6.32 × 10⁻³

32,560,008

In scientific notation  = 3.2560008× 10⁷

5.630

In scientific notation  = 5.630× 10⁰

95.002

In scientific notation  = 9.5002× 10¹

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3 years ago
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