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Phantasy [73]
2 years ago
12

Explain the most important difference between a physical and chemical change.

Chemistry
2 answers:
timama [110]2 years ago
7 0
You can see a physical change always but not always a chemical
Semmy [17]2 years ago
6 0

Answer:

answer below... hope this helps

Explanation:

When a substance undergoes a <u>physical change</u>, its composition remains the same despite its molecules being rearranged. When a substance undergoes a <u>chemical change</u>, its molecular composition is changed entirely. ... Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.

Burning of paper and log of wood, Digestion of food, Boiling an egg, Chemical battery usage, Electroplating a metal, Baking a cake, Milk going sour is a chemical change

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Phosphorus trichloride, PCl₃ is a liquid at room temperature.
Simora [160]

Answer:

Phosphorus trichloride, PCl₃ undergoes change in bonding and molecular force of attraction, causing it to be liquid at room temperature.

Explanation:

Unlike other chlorides of Period 3 elements, Phosphorus trichloride, PCl₃ changes the structure of its molecular bonding from ionic to covalent bonds as it transitions to fluids (liquids or gases). The PCl₃ molecule also has the weak Van der Waals dispersion and dipole-dipole attraction, making it a fuming liquid at room temperature,  with no electrical conductivity.

4 0
3 years ago
Is cyclohexanol an alkane, alkene, or an alcohol?
Oxana [17]
Cyclohexanol is an Alcohol..........
8 0
2 years ago
one reaction that produces hydrogen gas can be represented by the unbalanced chemical equation Mg(s)+HCI(aq) -&gt; MgCI(aq)+H2(g
Sonbull [250]
<h3>Answer:</h3>

128 g HCl

<h3>General Formulas and Concepts:</h3>

<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> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

  • Reading a Periodic Table

<u>Stoichiometry</u>

  • Reaction Mole Ratios
  • Using Dimensional Analysis
<h3>Explanation:</h3>

<u>Step 1: Define</u>

[RxN - Unbalanced] Mg (s) + HCl (aq) → MgCl (aq) + H₂ (g)

↓

[RxN - Balanced] 2Mg (s) + 2HCl (aq) → 2MgCl (aq) + H₂ (g)

[Given] 3.25 mol Mg

[Solve] x g HCl

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

[RxN] 2 mol Mg → 2 mol HCl

[PT] Molar Mass of H - 1.01 g/mol

[PT] Molar Mass of Cl - 35.45 g/mol

Molar Mass of HCl - 1.01 + 35.45 = 36.46 g/mol

<u>Step 3: Stoich</u>

  1. [S - DA] Set up:                                                                                                 \displaystyle 3.25 \ mol \ Mg(\frac{2 \ mol \ HCl}{2 \ mol \ Mg})(\frac{36.46 \ g \ HCl}{1 \ mol \ HCl})
  2. [S - DA] Multiply/Divide [Cancel out units]:                                                    \displaystyle 127.61 \ g \ HCl

<u>Step 4: Check</u>

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

127.61 g HCl ≈ 128 g HCl

3 0
2 years ago
When atoms come together, there is _______ between the negative electrons clouds.
Verdich [7]
I think the answer is ‘repulsion’
7 0
3 years ago
Friction is the force that occurs when: A. one object attracts or repels another. B. one object is rubbing against another. C. o
AlladinOne [14]

Answer:

b i think. hope im not wrong

4 0
2 years ago
Read 2 more answers
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