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kykrilka [37]
3 years ago
14

Minerals are identified by properties such as color, cleavage, and luster. For example, the piece of galena below is gray. It ha

s cubic cleavage and a metallic luster. cleavage, and luster are examples of _______. qualitative observations quantitative observations measurements inferences
Chemistry
1 answer:
nadya68 [22]3 years ago
8 0

Answer is: cleavage and luster are examples of qualitative observations.

Qualitative observationare information about the quality of substances.

In qualitative observation, informations are collected using senses (sight, hearing, taste, smell and touch).

Qualitative observations are not measurable and cannot be recorded in terms of numbers.

Luster is the way light interacts with the surface of a mineral.

Cleavage is the tendency of mineral to split along definite crystallographic structural planes.

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What is the solubility in moles/liter for silver chloride at 25 oC given a Ksp value of 1.6 x 10-10. Write using scientific nota
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Answer:

Explanation:

AgCl      ⇄       Ag⁺       +       Cl⁻

m                       m                   m

If x mole of AgCl be dissolved in one litre .

[ Ag⁺ ] [ Cl⁻ ] = 1.6 x 10⁻¹⁰

m² =  1.6 x 10⁻¹⁰

m = 1.26 x 10⁻⁵ moles

So solubility of AgCl is 1.26 x 10⁻⁵ moles / L

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3 years ago
If 4520 kj of heat is needed to boil a sample of water, what is the mass of water
Cerrena [4.2K]

Answer:

1,085g of water

Explanation:

If we have the value 4520kj is because the question is related to Energy and heat capacity. In this case, the law and equation that we use is the following:

                                                  Q= m*C*Δt  where;

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m is the mas

Δt= is the difference between final-initial temperature (change of temperature), in this exercise we don´t have temperatura change.

In order to determine the mass, I will have the same equation but finding m

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So: m= 4,520J/4.18J/g°C

      m= 1,0813 g

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3 years ago
The atom in a sample of an element must contain nuclei with the same number of?
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Hey there! 

Answer: Protons 

The atom in a sample of an element must contain nuclei with the same number of protons. If the protons change in number, then the element will modify as well. 

Thank you!
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