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makvit [3.9K]
3 years ago
6

What is the nucleus of an atom

Chemistry
2 answers:
vaieri [72.5K]3 years ago
4 0

Explanation: The nucleus of an atom is the middle part of an atom. Most of the mass of an atom is located here in a dense part. The nucleus or core of an atom is made up of protons which have a positive charge and neutrons which have no charge. Outside the nucleus, we have subatomic particles called electrons that have a negative charge.

Rasek [7]3 years ago
3 0
The nucleus is the atoms center. It contains the nucleons (protons & neutrons) and is positively charged.
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How many moles of Ag+ ions are present in 10 ml of a 0.75 M AgNO3 solution?
lana66690 [7]

Answer:

b. 7.5 x 10^-3

Explanation:

To solve this problem we need to keep in mind the <em>definition of molarity</em>:

  • Molarity = moles of solute / liters of solution

With the above information in mind it is possible to calculate the moles of solute, given the volume (10 mL) and concentration (0.75 M) of the solution:

  • First we<u> convert 10 mL to L</u> ⇒ 10 mL / 1000 = 0.01 L

Then we <u>calculate the moles of AgNO₃</u>:

  • moles of solute = Molarity * Liters of solution
  • 0.01 L * 0.75 M = 7.5x10⁻³ mol AgNO₃

<em>One mole of AgNO₃ contains one mole of Ag⁺</em>, thus the number of Ag⁺ moles is also 7.5x10⁻³.

5 0
3 years ago
For the following gases, correct the volumes to the conditions indicated. A.654 cm3 at 6 degrees Celsius and 65.3 kPa to 4 degre
leva [86]

Initial pressure of the gas = 65.3 kPa  

Initial volume of the gas = 654 cm³

Initial temperature of the gas = 6⁰C = 273 + 6 = 279 K

Final pressure of the gas = 108.7 kPa

Final temperature of the gas = 4⁰C = 273 + 4 = 277 K

Using the combined gas law for ideal gases:

P₁V₁/T₁ = P₂V₂/T₂  

where P₁, V₁ and T₁ are the pressure, volume and temperature for the initial state and P₂, V₂ and T₂ are the pressure, volume and temperature for the final state.

Plugging the given data into the combined gas law we have,

(65.3 kPa x 654 cm³) / (279 K) = (108.7 kPa x V₂)/(277 K)

V₂ = (65.3 kPa x 654 cm³ x 277 K) / (279 K x 108.7 kPa)

V₂ = 390.1 cm³


8 0
3 years ago
What is the expected ionic charge when group VI elements participate in ionic bonds?
valina [46]
Group 6 elements usually have extra electrons to make give them an octet. So, they have 6 electrons to start and when they have an octet, they have 8.

We can find the charge by doing simple math 6 - 8 = -2

Answer is D)
3 0
4 years ago
Big question for physicists out there:How can we be sure dark matter actually exists in our universe?
DanielleElmas [232]

Answer:

We can see the bright matter, like stars, but we know some other matter is there(dark matter)because of how it pulls on the bright matter.

Explanation:

6 0
3 years ago
What mass of sucrose needs to be dissolved into water in order to prepare a 15% by mass solution with a total mass of 650 g
Kryger [21]
All done for you. Hope it help

3 0
3 years ago
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