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Andrews [41]
2 years ago
13

Which scenarios are examples of physical changes? Check all that apply.

Chemistry
2 answers:
lawyer [7]2 years ago
8 0

Explanation:

Physical change is a change that does not affect the chemical composition of a substance but it changes the physical appearance like size or shape of the substance.

For example, crushing a can, melting of ice, breaking a glass etc represents the physical change.

Scenarios which represent examples of physical changes are as follows.

  • Silicon is cut into tiny pieces for computer chips.
  • Lead is melted to form pellets.
  • Liquid water freezes to form ice.


Alona [7]2 years ago
3 0

Answer:

Lead is melted to form pellets

Explanation:

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Describe some acidic oxides that can be prepared by thermal decomposition of nitrates and carbonates
azamat

When calcium carbonate is heated, it breaks down to form calcium oxide and carbon dioxide.

Thermal decomposition is the process in which heat is required.

It is also known as thermolysis.

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6 0
2 years ago
Show work!!
777dan777 [17]

The molecular formula of hydrate : CaCl₂.6 H₂O

So there are 6 molecules of H₂O

<h3>Further explanation</h3>

Given

54.7g CaCl₂ and 53.64 g H₂O

Required

The number of molecules H₂O

Solution

mol CaCl₂ :

= mass : MW

= 54.7 : 111 g/mol

= 0.493

mol H₂O :

= 53.64 : 18 g/mol

= 2.98

mol ratio H₂O : CaCl₂ :

= 2.98/0.493 : 0.493/0.493

= 6 : 1

5 0
2 years ago
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