Chemistry, 26.09.2019 06:50 sharondacarruth1656

Property
observation
color dull gray
density 11.3 g/cm3
volume of sample 3 cm3
melting point 327°c
reaction with air lead oxide forms on the surface
electrical conductivity conducts some electricity

which statement is true with respect to the investigation?
a.) the student investigated only the physical properties of lead.
b.) the student investigated only the chemical properties of lead.
c.) the student investigated more physical properties than chemical properties of lead.
d.) the student investigated more chemical properties than physical properties of lead.

Answers: 1

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Answers

The correct answer would be option C. From the list of investigation made by the student, it is clear that he investigated both the physical properties and the chemical properties of lead. Physical properties are the properties that can be observed or measured without changing the substance while chemical properties are those that are measured during or after a reaction is done.

Answer from: BluSeaa

The correct option is C.

Explanation:

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition of the substance gets changed.

Color : Dull gray (Physical property)

Density : 11.3 g/cm3 (Physical property)

Volume of sample : 3 cm3 (Physical property)

Melting point : 327°C (Physical property)

Reaction with air : Lead oxide forms on the surface (chemical property)

Electrical conductivity : Conducts some electricity (chemical property)

Student have investigated and observed four physical properties and two chemical properties of the sample.

Answer from: Quest

The teacher is mostly talking about the distillation of a mixture

Answer from: Quest

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. $hbr$ completely dissociates to $h^+$ and $br-$ ions. a is incorrect because $h_2s$ does not fully ionize to $h^+$ and $hs^-$ ions and some remain as the compound $h_2s$ . c and d are incorrect because, $li_2o$ and $libr$ do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise, if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both $li_2o$ and $libr$ have a complete octet so can not accept any electrons which disqualifies them as acids.

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Property
observation
color dull gray
density 11.3 g/cm3
volume of sample 3 c...

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