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lutik1710 [3]
2 years ago
9

1.08 Lab: Modeling Earth Science Processes 1 need help

Chemistry
1 answer:
algol132 years ago
5 0

The reason why modelling is used in the study of earth science processes is further explained below

<h3>What is earth science?</h3>

Earth science is defined as the branch of science that deals with the geology, oceanology and meteorology aspects of life.

Because these fields covered by earth sciences is are often not visible, models are used for its study for better understanding.

Learn more about geology here:

brainly.com/question/27519637

#SPJ1

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The densities of the coinage metals (copper, silver and gold) are as follows: copper = 8.95 g/cm3 silver = 12.59 g/cm3 gold = 19
ExtremeBDS [4]

1. The calculated density of the sample is 12.6 g/cm³

2. The sample is silver (option B)

<h3>Definition of density </h3>

The density of an object is defined as the mass of the object per unit volume of the object. Mathematically is expressed as:

Density = mass / volume

<h3>1. How to determine the density </h3>
  • Mass = 15.12 g
  • Volume = 1.20 cm³
  • Density =?

Density = mass / volume

Density = 15.12 / 1.20

Density = 12.6 g/cm³

<h3>2. How to determine the sample </h3>
  • Density of copper = 8.95 g/cm³
  • Density of silver = 12.59 g/cm³
  • Density of gold = 19.32 g/cm³
  • Calculate density = 12.6 g/cm³
  • Sample =?

From the above we can see that the calculated density is the approximate density of silver.

Therefore, the sample is silver

Learn more about density:

brainly.com/question/11810083

6 0
3 years ago
Lithium acetate, LiCH3CO2, is a salt formed from the neutralization of the weak acid acetic acid, CH3CO2H, with the strong base
Vesna [10]

Answer : The pH of 0.289 M solution of lithium acetate at 25^oC is 9.1

Explanation :

First we have to calculate the value of K_b.

As we know that,

K_a\times K_b=K_w

where,

K_a = dissociation constant of an acid = 1.8\times 10^{-5}

K_b = dissociation constant of a base = ?

K_w = dissociation constant of water = 1\times 10^{-14}

Now put all the given values in the above expression, we get the dissociation constant of a base.

1.8\times 10^{-5}\times K_b=1\times 10^{-14}

K_b=5.5\times 10^{-10}

Now we have to calculate the concentration of hydroxide ion.

Formula used :

[OH^-]=(K_b\times C)^{\frac{1}{2}}

where,

C is the concentration of solution.

Now put all the given values in this formula, we get:

[OH^-]=(5.5\times 10^{-10}\times 0.289)^{\frac{1}{2}}

[OH^-]=1.3\times 10^{-5}M

Now we have to calculate the pOH.

pOH=-\log [OH^-]

pOH=-\log (1.3\times 10^{-5})

pOH=4.9

Now we have to calculate the pH.

pH+pOH=14\\\\pH=14-pOH\\\\pH=14-4.9=9.1

Therefore, the pH of 0.289 M solution of lithium acetate at 25^oC is 9.1

4 0
4 years ago
24. a. Suppose different parts of a sample material
yaroslaw [1]

Answer:

One can conclude that the metal is an alloy.

Explanation:

An alloy is a combination of metal that has two or more elements. Different metals are usually combined to give it more strength or make it more resistant to corrosion.

Cheers!

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