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SpyIntel [72]
2 years ago
9

1. Write an unbalanced equation to represent each of the following equations. (Make sure to

Chemistry
1 answer:
notsponge [240]2 years ago
7 0

The equation for each reaction is written according to the relevant as below.

<h3>Equations of chemical reactions</h3>

The reaction between iron and sulfur to form iron (II) sulfide is written as:

  Fe + S --- > FeS

The reaction between hydrogen gas and oxygen gas to form water is written as:

H_2 (g) + O_2 (g) --- > H_2O (l)

The reaction of aluminum oxide to form aluminum and oxygen gas is written as:

Al_2O_3 --- > Al + O_2

Zinc and copper(II) sulfate react to form zinc(II) sulfate and copper as follows:

Zn+CuSO_4--- > ZnSO_4+Cu

Potassium hydroxide and hydrogen bromide react to form potassium bromide and water as follows:

KOH + HBr --- > H_2O + KBr

More on equations of chemical reactions can be found here: brainly.com/question/6976143

#SPJ1

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Precipitation calculations with Ni2+ and Pb2+
Maurinko [17]

Precipitation calculations with Ni²⁺ and Pb²⁺ a. Use the solubility product for Ni(OH)₂ (s) . the pH at which Ni(OH)₂ begins to precipitate from a 0.18 M Ni²⁺ solution. (Ksp Ni(OH)₂ = 5.5x10⁻¹⁶) is 6.8.

When Ni(OH)₂ starts precipitate :

Ksp of Ni(OH)₂ = [ Ni²⁺ ] [ OH²⁻ ]

5.5x10⁻¹⁶ = [ 0.18 ] [ OH²⁻ ]

[ OH²⁻ ] = 5.5x10⁻¹⁶ / 0.18

[ OH⁻ ] = 5.5 × 10⁻⁸ M

pOH = 7.2

therefore , pH = 14 - 7.2

                  pH = 6.8

Thus, Precipitation calculations with Ni²⁺ and Pb²⁺ a. Use the solubility product for Ni(OH)₂ (s) . the pH at which Ni(OH)₂ begins to precipitate from a 0.18 M Ni²⁺ solution. (Ksp Ni(OH)₂ = 5.5x10⁻¹⁶) is 6.8.

To learn more about pH here

brainly.com/question/15289741

#SPJ1

6 0
1 year ago
A map here shows the motion of a tectonic plate off the coast of the western united states. Which evidence supports the theory o
notsponge [240]

Answer:

Fossils, the shape of continents, the mid-ocean ridge system, sea floor sediment deposits, and the magnetism of rocks.

Explanation:

Fossils, the continent's shape, the mid-ocean ridge system, sea floor sediment deposits, and the magnetism of rocks on the sea floor are the evidences that support the theory of plate tectonics in the area. Fossils provides information to us when and where plants and animals once existed. Due to diverging plates, some life became isolated, and evolved into new species. Continental ‘fit’ through coastline matching. Some division of continents look as though they should fit together, e.g. South America and Africa.

7 0
2 years ago
How many of sodium (Na) are needed to make 4.5 liters of a 1.5mol/L of Na solution?​
Salsk061 [2.6K]

Answer:

Explanation:

First you will find the mole from the molarity and then the desired mass from the mole.

5 0
2 years ago
Chemical bonds
aniked [119]
Chemical bonds hold atoms together to form compounds through the sharing of electrons or the transferring of electrons. 
Bio is not my strongest subject, but I am pretty sure that a pyramid of numbers differs from an ecological pyramid because it displays the number of organisms at each trophic level
4 0
3 years ago
Read 2 more answers
What are the benefits of scientists using the metric system worldwide?select all that apply
denis-greek [22]

There are several scales to determine the weight of material. The chose of the weight scale depends upon the size of the material. Like if we have to measure the molecular or atomic weight of  a molecule or atom we use gm. Like that for the bigger molecules like proteins the weight of the molecule is expressed by different scale due to its big size. Like that for big material like iron rods etc we generally use kilograms or ton. There are two types of measuring units one is C.G.S. and another is S.I. The S.I. units are more acceptable worldwide than that the C.G.S. units as the digit comes in SI units are easily handable than that of CGS.

Thus metric is used to determine a large weight of compounds which is a SI unit and handable.    

4 0
3 years ago
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