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V125BC [204]
3 years ago
6

Which statement accurately describes global warming?

Chemistry
2 answers:
NNADVOKAT [17]3 years ago
7 0
I would say your answer is C, or the last one. Hope it helps
Anton [14]3 years ago
7 0

Answer:

The answer is C i just took the test and got it correct

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Why is the first jar of hydrogen gas collected during preparation discarded
valentina_108 [34]

Answer:

Hydrogen is collected by downward displacement of water as it is less denser than water. Hence it comes out at the surface of water . It is insoluble in water so it does not dissolve in water

7 0
2 years ago
Read 2 more answers
Using the solubility graph place the substances in order from most soluble (#1) to least soluble at 40°C. KNO3, NaClO3,KBr, NaCl
mestny [16]

Answer:

  • NaClO₃ > KBr > KNO₃ > NaCl.

Explanation:

The attached file contains the graph with the solubility curves for the four substances, KNO₃, NaClO₃, KBr, NaCl.

To determine the solubility of each salt at a certain temperature, you read the temperature on the horizontal axis, labeled Temperature (ºC), and move upward up to intersecting the curve of the corresponding salt. Then, move horizontally up to insersceting the vertical axis, labeled Solubility (g/100g of H₂O), to read the solubility.

The higher the reading on the vertical axis, the higher the solubility.

The red vertical line that I added is at a temperature of 40ºC.

The number in blue indicate the order in which the solubility curves are intersected at that temperature:

  • 4: NaCl: this is the lowest solubility
  • 3: KNO₃: this is the second lowest solubility
  • 2: KBr: this is the third lowest solubility
  • 1: NaClO₃: this is the highest solubility.

Thus, the rank, from most soluble to least soluble is:

  • NaClO₃ > KBr > KNO₃ > NaCl.

7 0
3 years ago
Vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
DIA [1.3K]

Answer:

Wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww

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3 0
3 years ago
13. Explain why changes in the concentrations of the
poizon [28]

Answer:

It is temperature dependent only

Explanation:

For any system in equilibrium, the molar concentration of all species on the right hand side are related to the molar concentrations of those at the left side by a constant known as the equilibrium constant.

  • The equilibrium constant is a constant at a given temperature.
  • The constant is temperature dependent only.
  • It is not dependent on the values of concentration or pressure of a system.
5 0
2 years ago
A hypothetical metal crystallizes with the face-centered cubic unit cell. The radius of the metal atom is 198 picometers and its
Neko [114]

Answer:

7.38 g/cm³ is the density of the metal

Explanation:

In a Face-centered cubic unit cell you have 4 atoms. Also, the edge length is √8×r (r is radius of the atom).

To solve this problem, we need first to calculate the volume of the unit cell and then, with molar mass calculate the mass of 4 atoms. As density is the ratio between mass and volume we can obtain this value.

  • <em>Volume of the unit cell</em>

Volume = a³

a = √8×r

(r = 198x10⁻¹²m)

a = 5.6x10⁻¹⁰ m

Volume = 1.756x10⁻²⁸ m³

1m = 100cm → 1m³ = (100cm)³:

1.756x10⁻²⁸ m³× ((100cm)³ / 1m³) =

<h3> 1.756x10⁻²² cm³ → Volume of the unit cell in cm³</h3><h3 />
  • <em>Mass of the unit cell:</em>

<em>There are 4 atoms of gold:</em>

4 atoms × (1mol / 6.022x10²³ atoms) = 6.64x10⁻²⁴ moles of gold

As 1 mole weighs 195.08g:

6.64x10⁻²⁴ moles of gold × (195.08g / mol) =

<h3>1.296x10⁻²¹g is the mass of the unit cell</h3><h3 />
  • <em>Density of the metal:</em>

1.296x10⁻²¹g / 1.756x10⁻²² cm³ =

<h3>7.38 g/cm³ is the density of the metal</h3>
3 0
3 years ago
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