CHEMISTRY HIGH SCHOOL

Write a balanced equation for each of the following reactions:the reaction of solid lithium with nitrogen to form solid lithium nitride.
the reaction between aqueous solutions of cobalt(III) nitrate and sodium hydroxide to form aqueous sodium nitrate and solid cobalt(III) hydroxide.
the reaction between solid zinc and aqueous hydrochloric acid in a single replacement reaction.
classify the reactions in (a) and (b).

Answers

Answer 1
Answer:

Synthesis Reaction

6Li(s) + N₂(g) ⇒ 2Li₃N(s)

Double Replacement Reaction

Co(NO₃)₃(aq) + 3NaOH(aq) ⇒ 3NaNO₃(aq) + Co(OH)₃(s)

Zn(s) + 2HCl(aq) ⇒ ZnCl₂(aq) + H₂(g)

What is double replacement reaction?

  • A double-displacement reaction has the general formula AB + CD = AD + BC. Double-displacement reactions include the following examples: Ammonium Chloride, a salt, and sodium hydroxide, a base, combine to produce sodium chloride, hydrochloric acid, and water. In a double replacement process, the atoms of two compounds are switched, creating two new molecules.
  • Metals always replace metals, and nonmetals always replace nonmetals in single replacement processes.
  • Precipitates are frequently created by double replacement reactions when insoluble chemicals are created.
  • Checking to see if the cations exchanged anions with one another is the simplest technique to determine whether a reaction is a double displacement.
  • If the states of matter are mentioned, another indicator to look for is the production of a single solid product and watery reactants (since the reaction typically generates a precipitate)

To learn more about double replacement reaction, refer

brainly.com/question/23918356

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Answer 2
Answer: 6Li(s) + N₂(g) ⇒ 2Li₃N(s) Synthesis Reaction

Co(NO₃)₃(aq) + 3NaOH(aq) ⇒ 3NaNO₃(aq) + Co(OH)₃(s) Double Replacement Reaction

Zn(s) + 2HCl(aq) ⇒ ZnCl₂(aq) + H₂(g)

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Which substance has the lowest vapor pressure at 75°C?(1) water (3) propanone
(2) ethanoic acid (4) ethanol

Answers

Answer : (2) Ethanoic acid has the lowest vapor pressure at 75^(0)C.

Explanation :

Vapor pressure is the pressure which is exerted by vapor when the vapor form is in equilibrium with the solid or liquid form.

Boiling point is the temperature in which the vapor pressure of liquid is equal to the atmospheric pressure.

Vapor pressure is related with the boiling point :

vapor pressure is inversely proportional to the boiling point. As the boiling point increases, vapor pressure decreases and as the boiling point decreases, vapor pressure increases.

\text{Vapor presssure }\infty \frac{1}{\text{boiling point}}

The standard boiling point of given liquids water, propanone, ethanoic acid and ethanol are 100, 56, 118 and 79^(0)C respectively.

The image of graph of vapor pressure vs temperature is attached below.

Hence,  Ethanoic acid is the substance which has the lowest vapor pressure.
Vapor pressure is a colligative property. This means that intermolecular forces play a large role in how volatile a substance is. We can thus assume that the substance and or liquid in this case with the strongest intermolecular forces will have the lowest vapor pressure, as intermolecular attraction will oppose the vaporizing forces created by temperature and or kinetic energy. The strongest of such intermolecular forces is hydrogen bonding, and given some knowledge of boiling point we can find the answer. In this case:
water: has hydrogen bonding, dispersion, and dipole forces for intermolecular attraction
ethanoic acid: a carboxylic acid has one polar end with a negative charge as CH3COOH turns to CH3COO-. Hydrogen bonding is also present in pure solutions.
Propanone: is a ketone and has an electronegative oxygen attached to a carbon, but does not exhibit hydrogen bonding since the O is not attached to a hydrogen. 
Ethanol: Like water exhibits hydrogen bonding, not as strong but more dispersion forces. 

Next we must understand boiling points
Water: 100˚C
Ethanoic Acid: 118˚C
Propanone: 56˚C
Ethanol: 78˚C
Given this knowledge we can order the liquids in terms of decreasing volatility or decreasing vapor pressure. We now notice that Ethanoic acid, or acetic acid will have the lowest vapor pressure at 75˚C

Which electrons are removed first when forming cations of Period 4 transition elements?

Answers

Electrons are always removed from the valence electron shells and from the valence orbitals within the shell when forming a cation. For example, Cr has a electronic configuration of 1s2 2s2 2p6 3s2 3p6 3d5 4s1
When forming the ion Cr3+, the new electronic configuration will be 1s2 2s2 2p6 3s2 3p6 3d3. We can see that 3 electrons are removed from the valence shell following the order of the highest energy orbitals to lower energy.

According to Bohr's model, what can be said of the amount of energy that an electron absorbs when it is excited compared to the amount of energy that it releases when it returns to ground state?A. The amount of energy that is absorbed is greater than the amount of energy that is released.

B. The amount of energy that is absorbed is the same as the amount of energy that is released.

C. The amount of energy that is absorbed is less than the amount of energy that is released.

Answers

letter b. because energy can't be created nor destroyed

What is a chemical change

Answers

A chemical change Is any change that results in the formation of new chemical substances .


I hope that's help and have a great night !

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Answers

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the scientists would do biological studies of how the protein breakdown and combines with the muscles the engineers with then create a delivery system to get the protein to the muscle quicker and more effectively

The Solvay process is a multistep industrial process used to produce washing soda, Na2CO3(s). In the last step of the Solvay process, NaHCO3(s) is heated to 300°C, producing washing soda, water, and carbon dioxide. This reaction is represented by the balanced equation below.2NaHCO3(s) + heat ==> Na2CO3(s) + H2O(g) + CO2(g)

Write the IUPAC name for washing soda.

Answers

Its IUPAC name is sodium carbonate. It is also known as soda ash. It is the water soluble sodium salt of carbonic acid and occurs as a crystalline heptahydrate. Sodium carbonate has an alkaline taste and when in solution forms a basic solution. One important application is that it is used commonly as a water softener.
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