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Akimi4 [234]
3 years ago
5

What number would you write before water in the formula for calcium carbonate nonahydrate? 4 5 7 9

Chemistry
1 answer:
Sunny_sXe [5.5K]3 years ago
7 0
Nonahydrate means that there will be 9 water molecules attached to calcium carbonate

The correct answer is 9.
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List emergency equipment, those are available in the laboratory?
mestny [16]

Answer:

Hands-free eyewash stations, sand bucket, fire blankets, fire extinguishers, fire alarm system and first aid kit.

Explanation:

Working in laboratories has many risks, therefore, preventive measures that should be incorporated to avoid the occurrence of any laboratory accidents.

Some of the important emergency equipment that should be available in laboratories are: hands-free eyewash stations, sand bucket, fire blankets, fire extinguishers, fire alarm system, chemical storage cabinet, first aid kits and fume hood.

Some of the personal protective equipment include lab coats, goggles, safety gloves and face shield.

7 0
3 years ago
To what volume should 5.0 g of KCl be diluted in order to prepare a 0.15 M solution? L
Nesterboy [21]

Answer:0.45L

Explanation:

molarity=0.15M

Mass=5g

No of moles=mass ➗ molecular mass

Molecular mass of KCL=39.0983x1+35.453x1

Molecular mass of KCL=74.5513

No of moles=5 ➗ 74.5513

No of moles=0.067

Volume in liters=No of moles ➗ molarity

Volume in liters=0.067 ➗ 0.15

Volume in liters=0.45L

7 0
3 years ago
When an electron drops from a higher energy level to a lower one, energy is emitted. in comparison, how much energy is required
NNADVOKAT [17]

Energy is released when an electron transitions from one energy level to another. In contrast, the same amount of energy is needed to carry out the process, the other way around, from the bottom elevation to the upper one.

What occurs when an electron transitions from one energy level to another?

  • The energy of the electron drops when it changes levels, and the atom releases photons. The electron emits a photon when it transitions from a greater to a lower energy level. The energy emitted is precisely the energy that is lost when an electron moves to a level with less energy.
  • An atom's electrons have negative energy. The electron must be given energy in order to be removed from the hydrogen atom, as shown by the negative sign. The quantity of energy in the atom will rise by supplying the electron with energy. Similar to how a ball on Earth chooses to rest in valleys rather than hills, the electron wants to spend the majority of its time at a lower energy level.
  • For a brief period of time, the electron remains in an excited state. The energy required to bring the electron to its lower-energy state will be released when the electron transitions between excited and unexcited states.

Learn more about electrons here:

brainly.com/question/1255220

#SPJ4

7 0
1 year ago
True or False: Jumpstart is a fast-paced method for identifying problems and solutions in a single session that can be used with
Tpy6a [65]

Answer:

<em><u>The answer is</u></em>: <u>False.</u>

<u />

Explanation:

Six Sigma is a methodology for continuous improvement that increases performance by controlling variability and focusing the process on customer specifications. It will be used within other methods such as Rummler: Brache, Scrum and TQM.

JumpStart is an educational media franchise for children, consisting mainly of educational games, produced by JumpStart Games.

<em><u>The answer is</u></em>: <u>False.</u>

3 0
3 years ago
Why is absolute zero
weeeeeb [17]
I think it is D
Hope this help you?
8 0
3 years ago
Read 2 more answers
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