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san4es73 [151]
3 years ago
15

Select the physical properties. select all that apply. density hardness boiling point melting point reactivity fllammability

Chemistry
2 answers:
Crank3 years ago
7 0

Answer: Density, Hardness, Boiling point, Melting Point

Explanation: Physical Properties are those properties which can be measured. These are those observables which can be used to defined to the state of the system and which do not bring any change in the molecular composition of the system.

Whereas Chemical Properties are those which can bring changes in the original identity of the composition.

Out of the given, Density, Hardness, Boiling Point and Melting Point r the properties due to which the physical state of any system can be defined.

Reactivity and Flammability cannot be considered among them.

anzhelika [568]3 years ago
4 0
The answer to the given problem are:
1. Density
2. Hardness
3. Boiling Point 
4. Melting Point


These are the list of physical properties except for two which are reactivity and flammability. These two should be excluded in the list of physical properties.
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How do you calculate the number of valence electrons in an atom?
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Balance this equation<br> _Al +_HCI --&gt; _H2 +_AICIz
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2Al+6HCl⇒3H₂+2AlCl₃

<h3>Further explanation </h3>

Equalization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:  

• 1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.  

• 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product  

• 3. Select the coefficient of the substance with the most complex chemical formula equal to 1  

Reaction

Al+HCl⇒H₂+AlCl₃

  • Give coefficient

aAl+bHCl⇒cH₂+AlCl₃

  • Make equation

Al, left=a, right=1⇒a=1

Cl, left=b, right=3⇒b=3

H, left=b, right=2c⇒b=2c⇒3=2c⇒c=3/2

the equation becomes :

Al+3HCl⇒3/2H₂+AlCl₃ x2

2Al+6HCl⇒3H₂+2AlCl₃

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A variable shape that adapts to fit its container.

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Answer:

It is 34

Explanation:

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