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zloy xaker [14]
3 years ago
12

Water evaporating from a puddle is an example of a

Chemistry
2 answers:
musickatia [10]3 years ago
6 0

Answer: physical change.

Explanation:

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.  Example: Corrosion of iron.  

Chemical property is defined as the property of a substance which becomes evident during chemical changes. Example: Reactivity with other substances

A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.  Example: evaporation of water

Physical property is defined as the property of a substance which becomes evident during physical changes. Example: Boiling point

Thus Water evaporating from a puddle is an example of a physical change.

Flauer [41]3 years ago
5 0
It is an example of physical change. The molecules are not changing, so it is not chemical, and a physical property is something that a physical thing has.


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Nitella [24]

Answer:

Mg(NO4)2 is 180.3 g/mol

Explanation:

First find the substance formula.

Magnesium Nitrate.

Magnesium is a +2 charge.

Nitrate is a -1 charge.

So to balance the chemical formula,

We need 1 magnesium atom for every nitrate atom.

2(1) + 1(-2) = 0

So the substance formula is Mg(NO4)2.

Now find the molar mass of Mg(NO4)2.

Mg = 24.3 amu

N = 14.0 amu

O = 16.0 amu

They are three nitrogen and twelve oxygen atoms.

So you do this: 24.3 + 14.0(2) + 16.0(8) = 180.3 g/mol

So the molar is mass is 180.3 g/mol.

The final answer is Mg(NO4)2 is 180.3 g/mol

Hope it helped!

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3 years ago
Formula for water what does the lack of a subscript after those O indicate
photoshop1234 [79]
It indicates that there is only one oxygen molecule
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Number of stable isotopes in Hydrogen?
kari74 [83]
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What would the products of a double-replacement reaction between KBr and CaO be? (Remember: In double-replacement reactions, the
11111nata11111 [884]

ANSWER

\begin{gathered} \text{ 2KBr }+\text{ CaO }\rightarrow\text{ K}_2O\text{ }+\text{ CaBr}_2 \\ Option\text{ B} \end{gathered}

EXPLANATION

Given that;

The two reactants are KBr and CaO

Double replacement reaction is a type of chemical reaction that occur when two reactants exchange cations and anions to yield new products.

\text{ 2KBr + CaO  }\rightarrow\text{ K}_2O\text{ + CaBr}_2

Therefore, the resulting products of the given data are K2O + CaBr2

The correct answer is option B

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1 year ago
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erastovalidia [21]

Answer:

2NaOH + H2So4 》Na2So4+ 2H2O

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FULFURIC ACID, H2So4 IS (aq)

SODIUM SULFATE, Na2So4 IS (aq)

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