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damaskus [11]
3 years ago
15

Which of the following is an example of a decomposition reaction? 1) H2 + O2 ----------→ H2O 2) MgO2 -------------→ Mg + O2 3) M

gSO4 + 2NaCl ----------→ MgCl2 + Na2SO4 4) 2Na + Cl2 -----------→ 2NaCl
Chemistry
1 answer:
podryga [215]3 years ago
4 0

Answer:

2) MgO ---→ Mg + O2

Explanation:

Chemical decomposition is defined as the breakdown or breaking of a single molecule or entity into two or more smaller fragments.

Chemical decomposition is usually regarded as the exact opposite of chemical synthesis. In most cases, the chemical reaction in which two or more products are formed from a single reactant is called a decomposition reaction.

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You need to produce a buffer solution that has a pH of 5.31. You already have a solution that contains 10. mmol (millimoles) of
Karolina [17]

Answer:

37 mmol of acetate need to add to this solution.

Explanation:

Acetic acid is an weak acid. According to Henderson-Hasselbalch equation for a buffer consist of weak acid (acetic acid) and its conjugate base (acetate)-

pH=pK_{a}(acetic acid)+log[\frac{mmol of CH_{3}COO^{-}}{mmol of CH_{3}COOH }]

Here pH is 5.31, pK_{a} (acetic acid) is 4.74 and number of mmol of acetic acid is 10 mmol.

Plug in all the values in the above equation:

5.31=4.74+log[\frac{mmol of CH_{3}COO^{-}}{10}]

or, mmol of CH_{3}COO^{-} = 37

So 37 mmol of acetate need to add to this solution.

3 0
2 years ago
What is the name of the monomer that polymerizes to form polymethylmethacrylate
Cloud [144]

Answer:

polymethylmethacrylate bone cement is a polymer formed by mixing highly volatile liquid methylmethacrylate (MMA) monomer with an accelerator, polymethylmethacrylate powder. This bone cement is used during orthopedic surgery to implant prostheses for joint replacement

Explanation:

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7 0
3 years ago
Which fire symbol signifies ammunition with a mass explosion?
marissa [1.9K]

The answer is Fire symbol 1  

That is Fire symbol 1, signifies ammunition with a mass explosion.

The symbol can be seen in the image attached.

This symbol includes these :

1. Do not use fire fighting unless rescue attempt is planned.

2. If person's safety is in danger, use cover.

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4 0
3 years ago
How will freezing the juice affect its mass?
expeople1 [14]

Answer:

Mass increases since its going from liquid to solid.

Explanation:

8 0
3 years ago
What is moment and its calculations ​
PIT_PIT [208]

Answer:

Moment=Force x Pivot

Explanation:

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When an object is balanced (in equilibrium) the sum of the clockwise moments is equal to the sum of the anticlockwise moments.

How to calculate moments:

Moment=Force x Pivot

3 0
2 years ago
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