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MariettaO [177]
4 years ago
13

prease tell me the answer. When a liquid changes to a gas below the surface of a liquid as well as at the surface, it is called

Chemistry
2 answers:
jarptica [38.1K]4 years ago
7 0

Answer:

Boiling

Explanation:

As. you heat a liquid, its molecules gain kinetic energy and move faster.

Some of the molecules at the surface have enough kinetic energy to escape into the space above the surface. In a closed container, these molecules exert a pressure (called the <em>vapour pressure</em>) on the walls of the container.

In an open container, the molecules simply escape into the atmosphere.

If you add enough heat, the liquid will reach a temperature at which the <em>vapour pressure equals the atmospheric pressure</em>.

The surface molecules then have enough energy to escape freely into the atmosphere. The water has reached its boiling point.

If you keep on heating, you will see bubbles of vapour will form in the liquid and rise to the surface. When that happens, you know that the liquid is boiling.

Anton [14]4 years ago
6 0
Its called freezing, the change from a liquid to a gas is called vaporization
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Answer:

100 degree celsius

Explanation:

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How many atoms are in a 1.8 mol sample of Magnesium (Mg)?
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Answer:

1.1 × 10²⁴ atoms Mg

General Formulas and Concepts:

<u>Atomic Structure</u>

  • Moles
  • Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Stoichiometry</u>

  • Using Dimensional Analysis

Explanation:

<u>Step 1: Define</u>

<em>Identify</em>

[Given] 1.8 mol Mg

[Solve] atoms Mg

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

  1. [DA] Set up:                                                                                                       \displaystyle 1.8 \ mol \ Mg(\frac{6.022 \cdot 10^{23} \ atoms \ Mg}{1 \ mol \ Mg})
  2. [DA] Multiply [Cancel out units]:                                                                      \displaystyle 1.08396 \cdot 10^{24} \ atoms \ Mg

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 2 sig figs.</em>

1.08396 × 10²⁴ atoms Mg ≈ 1.1 × 10²⁴ atoms Mg

5 0
3 years ago
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One way to determine the pH of a solution is to measure the concentration of the acid and base forms of the indicator colorimetr
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Answer:

pH = 4.26

Explanation:

Bromocresol green is a commonly used pH indicator. The concentration ratio of the acid form to base form explains its color, which reflects the pH of the medium.

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We can calculate the pH through Henderson-Hasselbalch's equation:

pH=pKa+log(\frac{[base]}{[acid]} )=4.66+log(\frac{1}{2.49} )=4.26

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3 years ago
I don’t know it A is correct please tell me the right answer
Greeley [361]

I do believe the answer is A. Hope this helps.

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Why is calcuim (ca) in group 2. period 4 on the periodic table
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Answer:

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