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Lisa [10]
3 years ago
14

What's the name for the phase change from solid to gas

Chemistry
2 answers:
tankabanditka [31]3 years ago
6 0
The change from solid to gas is "<span>sublimation."</span>
Andreyy893 years ago
4 0
The answer is sublimation
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evidence of a chemical change includes A) change in size B) change in color C) change in shape D) change in weight
Ilia_Sergeevich [38]

Answer:

The answer is B

Explanation:The answer is B because the color would be irreversible.

4 0
4 years ago
What is the pH of an aqueous solution of 1 M CH3COOH (pKa=4)
Mrac [35]

Answer:

pH = 2.

Explanation:

A weak acid is in equilibrium with its ions in a solution, so it must have an equilibrium constant (Ka). And, pKa = -logKa

Ka = 10^{-pKa}

Ka = 10⁻⁴

So, for CH₃COOH the equilibrium must be:

CH₃COOH(aq) ⇄ H⁺(aq) + CH₃COO⁻(aq)

1 M                           0                0                Initial

-x                              +x              +x               Reacted

1-x                             x                x                 Equilibrium

And the equilibrium constant:

Ka = \frac{[H+]x[CH3COO-]}{[CH3COOH]}

10^{-4} = \frac{x^2}{1-x}

Supposing x << 1:

10⁻⁴ = x²

x = √10⁻⁴

x = 10⁻² M, so the supposing is correct.

So,

pH = -log[H⁺]

pH = -log10⁻²

pH = 2

8 0
4 years ago
Calculate the number of moles of Na+ ions in 25g of sodium carbonate?​
valkas [14]

Explanation:

First, we need to calculate the number of moles of sodium carbonate we have in a 25 g sample. To calculate this, we will

find the molar mass of sodium carbonate (Na2CO3):

⇒ 2 × Molar mass of sodium + Molar mass of carbon + 3×molar mass of oxygen

⇒ 2 × 23 + 12 + 3 × 16

⇒ 46 + 12 + 48

⇒ 106g/mol

Thus, the molar mass of Na2CO3 is 106g/mol.

Therefore, number of moles = 25 ÷ 106

=> 0.2358 mol

Now, we know that every mole of Na2CO3 have 0.2358 moles of Na+ ions. Hence, total moles of Na2CO3 is 0.4716 moles

Number of ions present = 6.022 × 1023 × 0.4716 mol = 2.84 × 1023ions

6 0
3 years ago
How many atoms are present in 3 moles of chromium?
Murljashka [212]

Answer:

1.80 x 10^24 atoms

Explanation:

3moles × 6.022×10^23 atoms/mole

3 0
3 years ago
Which set of three quantum numbers (n, l, ml) corresponds to a 2p orbital?
Sunny_sXe [5.5K]
N=2 (always first number), l=1 (corresponds to p), ml=(-1 to 1)
4 0
3 years ago
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