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laila [671]
3 years ago
8

When heat energy is added two changes are observed: Change A: solid changes phases to a liquid Change B: liquid changes phases t

o a gas What are the names or phase changes in A and B
Chemistry
2 answers:
AlexFokin [52]3 years ago
8 0
A is melting. Melting occurs when the molecules of a solid speed up enough that the motion overcomes the attractions so that the molecules can move past each other as a liquid.

b is evaporation The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor
Scilla [17]3 years ago
8 0

Answer:

C) A is melting and B is evaporation.

Explanation:

Solids turn to liquids at high temperatures, and same thing with liquids turning into gases.

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What element has the electron configuration 1s22s22p63s23p64s23d104p65s24d105p66s24f145d106p2?
Marina CMI [18]
<span>6s²4f¹⁴5d¹⁰6p²
6 shows that the element is in the 6 period,
6p² shows that the element is in the 14th group. (1 and 2 groups have s -electrons as last ones, 13 group has s²p¹, and 14 group has s²p²)
The element is Pb.

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3 0
3 years ago
Read 2 more answers
100 POINTS PLEASE HELP!!! ASAP!!!! CORRECT ANSWER GETS BRAINLIEST
aalyn [17]

If a substance has a relatively low melting point (below 400ºF), then it is either molecular polar or molecular non-polar

If a substance has a high melting point, then it is either metallic, covalent network, or ionic

The stronger a substance’s bonds, the higher its melting point

4 0
3 years ago
What is the world's most common acid<br> and also the world's most common base?
Ray Of Light [21]

Answer:

Thus, as both an amphoteric compound and the most common liquid on Earth, it follows that water is both the most common acid as well as the most common base on planet Earth

4 0
3 years ago
2. Which equation represents a transmutation?
antiseptic1488 [7]

8935982560 plz contact me

5 0
2 years ago
Convert the following Grams: 0.200 moles of H2S
ANEK [815]

Answer:

6.82 g H₂S

General Formulas and Concepts:

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Chemistry</u>

<u>Atomic Structure</u>

  • Reading a Periodic Table

<u>Stoichiometry</u>

  • Using Dimensional Analysis

Explanation:

<u>Step 1: Define</u>

0.200 mol H₂S

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

Molar Mass of H - 1.01 g/mol

Molar Mass of S - 32.07 g/mol

Molar Mass of H₂S - 2(1.01) + 32.07 = 34.09 g/mol

<u>Step 3: Convert</u>

  1. Set up:                    \displaystyle 0.200 \ mol \ H_2S(\frac{34.09 \ g \ H_2S}{1 \ mol \ H_2S})
  2. Multiply:                  \displaystyle 6.818 \ g \ H_2S

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

6.818 g H₂S ≈ 6.82 g H₂S

7 0
3 years ago
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