Please help! I have 2 remaining attempts and only 2 of my answers are incorrect. Please let me know which reactions are wrong and where they should be put! LOTS OF POINTS!!!!

The combustion of ammonia in the prescne of excess oxygen yield no2 and h2o. 0.119  grams of no2 are produced when 43.9mg of ammonia burn.

Molar mass of NH3 = 1*MM(N) + 3*MM(H)

= 1*14.01 + 3*1.008

= 17.034 g/mol

mass of NH3 = 0.0439 g

mol of NH3 = (mass)/(molar mass)

= 0.0439/17.034

= 2.577*10^-3 mol

From balanced chemical reaction, we see that

when 4 mol of NH3 reacts, 4 mol of NO2 is formed

mol of NO2 formed = moles of NH3

= 2.577*10^-3 mol

Molar mass of NO2 = 1*MM(N) + 2*MM(O)

= 1*14.01 + 2*16.0

= 46.01 g/mol

mass of NO2 = number of mol * molar mass

= 2.577*10^-3*46.01

= 0.119 g

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Answer:

Diagram Z

Explanation:

A cell placed into a hypotonic solution will swell and expand until it eventually burst through a process known as cytolysis.

Answer:

Diagram Y

Explanation:

Osmosis is the passive movement of water molecules across (into or out of) a cell membrane. "Passive" means that the process occurs automatically without the need for chemical energy.

In the diagrams above, a plant cell is shown as it would appear in a solution with a solute concentration more than its own (X), a solution with a solute concentration equal to its own (Y), and a solution with a solute concentration less than it own (Z). The movement of water is toward the area of more solute concentration (and therefore less water concentration).

The answer, then, is Diagram Y.

(Trust me, I just did it)

The characteristic of some repeating property can be used to find the answer is

The periodic table created by Mendeleev was initially based on the atomic weight of the elements, but he realized that the similarities of the atoms were greater if he used the atomic number, so he changed the ordering.

Mendeleev found that elements with the same number of electrons in their last shell had similar properties, when he ordered them he found that there were holes in the table, shortly after the work of many researchers the holes were completed and found numerous new chemical elements.

In the observation of the phases of the Moon around the earth it is found that for short measurements there are four phases, for longer measurements in addition to these four phases there are several higher repetition periods, with repeated observation the phases and periods are found. .

We can see that the two jobs are searched for, which is repeated and a table is created, leaving the spaces that are not known empty, with subsequent jobs filling these holes.

In conclusion, with the characteristics of some repeating property, the answer can be found is

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In the nitrate reduction test , The result would be after solution a and b were added to a culture that had reduced nitrate to ammonia that  no color would form.

The nitrite reduction based on the measurement of nitrite.  when we add zinc to the reduction of nitrate to nitrite and if the the red color developed after addition of zinc then it means nitrate was not reduce. if there is no color obtain after adding the zinc then nitrate was completely reduced to nitrite.

Thus, In the nitrate reduction test , The result would be after solution a and b were added to a culture that had reduced nitrate to ammonia that  no color would form.

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Answer:

A. To study the chemical composition of the surface of a planet

Explanation:

Strictly speaking, a spectrometer is any instrument used to view and analyze a range (or a spectrum) of a given characteristic for a substance (for example, a range of mass-to-charge values as in mass spectrometry), or a range of wavelengths as in absorption spectrometry like nuclear magnetic radiation spectroscopy

-hope this helps!

Triethylamine ((CH3CH2)3N) is less soluble in water than ((CH3CH2)3N•HCl). Compared to the uncharged N atom in triethylamine, the positive charge on the N atom in triethylammonium chloride is more polar.

If your compound is not susceptible to moisture, you should dissolve it in dichloromethane or chloroform before giving it a brief wash in cold water and separating it. Cold water washing reduces the product's water solubility. Triethylamine and HCl (strong acid) are combined to form the salt triethylammonium chloride (weak base).

Chloroform readily dissolves the salt of triethylamine hydrochloride. To produce 93 grammes of crude using triethylamine hydrochloride salt, chloroform is first removed. In order to get a certain acidic pH, it is dissolved in 250 mL of water, cooled to 10 °C, then acidified by adding 10% hydrochloric acid.

Triethylamine ((CH3CH2)3N) is less soluble in water than ((CH3CH2)3N•HCl). Compared to the uncharged N atom in triethylamine, the positive charge on the N atom in triethylammonium chloride is more polar. Enhanced solubility results from greater interactions with water as a result of this increased polarity.

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Answer:

the object should be displaced on which the force is applied

Explanation:

HOPE IT HELPS YOU

A cube of gold weighing 185g is heated from 20.0°C to some higher temperature, with the absorption of 225 joules of heat. The specific heat of gold is 0.030 J/g°C. 60.5°C was the final temperature of the gold.

Gold has the chemical symbol Au (from Latin: aurum) as well as the atomic number 79. As a result, it is one among the highest atomic number elements found in nature.

In its pure state, it is a brilliant, somewhat orange-yellow, dense, soft, malleable, extremely ductile metal. Gold is indeed a transition metal as well as a group 11 element chemically.

225 = 185 × 0.030×(final temperature- 20.0)

225 =5.55×(final temperature- 20.0)

225/ 5.55 = final temperature- 20.0

60.5 = final temperature

Therefore, 60.5°C was the final temperature of the gold.

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The statement "In North America, over 90% of the grain grown is used to feed livestock" is TRUE. Regarding the question "What are the two types of erosion?", the answer is physical erosion and chemical erosion.

Erosion is the process of wearing or grinding something down, often by water, wind, or ice. Erosion occurs when the Earth's surface is disturbed or exposed to certain elements.

It can be defined as the natural process of carrying away or removing soil, rock, or other materials from the Earth's surface by water, wind, or other natural forces.Physical erosionPhysical erosion is caused by natural processes such as wind, water, or ice, and it occurs when rocks and soil are loosened and removed by a natural agent.

Physical erosion may be caused by things such as earthquakes, volcanoes, glaciers, and landslides.Chemical erosionChemical erosion is caused by chemical processes such as acid rain and the breakdown of rocks by chemical reactions. Chemical erosion can be caused by things such as rainwater, acid rain, and groundwater that dissolves minerals and rocks.

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Answer:

here's the answer hope it helps

Answer:

Mass of Magnesium Chloride = 26.85 grams

Percentage of Magnesium= 25.5 %

Percentage of Chlorine =74.5 %

Explanation:

Mass of Magnesium Chloride= Mass of magnesium + Mass of Chlorine        6.85 grams + 20.0 grams = 26.85 grams

Percentage of Magnesium = 6.85 grams/26.85 grams x 100% = 25.5%

Hence, Magnesium = 25.5 %

Percentage of Chlorine = (20.0 grams/26.85 grams) x 100 % = 74.5%

Hence, Chlorine = 74.5 %

So, the compound is 25.5 % magnesium and 74.5 % Chlorine by mass.

The following reactions of alkenes is not stereospecific is C. acid-catalyzed hydration reaction (H₂O/H₂SO₄)

Stereospecific reactions occur when the stereochemistry of the reactant is retained in the product. These types of reactions are distinguished by the use of double-headed arrows in reaction mechanisms to demonstrate the conservation of stereochemistry. The following reactions of alkenes stereospecific are hydrogenation (H₂/P₁), bromination (Br₂ in CH₂Cl₂), bromohydrin formation (Br₂/H₂O).

The acid-catalyzed hydration reaction (H₂O/H₂SO₄) of alkenes is not stereospecific because the H and OH atoms can be added to either face of the alkene's double bond. When the reaction occurs, an intermediate carbocation is formed, which is planar. This carbocation can either be attacked by the nucleophile from above or below, resulting in the formation of an equal amount of stereoisomers. Therefore, the correct answer is C. acid-catalyzed hydration reaction (H₂O/H₂SO₄) is not stereospecific.

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The mass of the cube of iron with a side length of 55.0 mm is approximately 1313.6125 grams.

To calculate the mass of a cube of iron, we need to know the density of iron and the length of one side of the cube. Given that the density of iron is 7.9 g/cm^3 and the length of one side of the cube is 55.0 mm, we can proceed with the calculation. First, we need to convert the length of one side from millimeters (mm) to centimeters (cm) since the density is given in grams per cubic centimeter. We divide 55.0 mm by 10 to obtain 5.5 cm.

Next, we can calculate the volume of the cube using the formula V = (side length)^3. Substituting the value of 5.5 cm into the formula, we get V = (5.5 cm)^3 = 166.375 cm^3. Finally, we can calculate the mass of the cube using the formula mass = density × volume. Substituting the values of density (7.9 g/cm^3) and volume (166.375 cm^3), we get mass = 7.9 g/cm^3 × 166.375 cm^3 = 1313.6125 g.

In summary, to calculate the mass of the iron cube, we convert the length from millimeters to centimeters, calculate the volume of the cube, and then multiply it by the density of iron. The resulting mass is approximately 1313.6125 grams.

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Answer:

A. Solids can only change shape if forced to make a change

Explanation:

A solid substance is one of the states of matter.

Matter is anything that has weight and occupies a definite space.

There are three states of matter commonly known: solids, liquids and gases.

Answer:

Maintain constant velocity

Answer: maintain a constant velocity until acted on by another force

Explanation: i took the test

The changes are classified as follows:

1: Chemical change -  The addition of the water to quicklime

2: Physical change - The melting of candle wax

3: Physical change -  The change in colour of zinc oxide from white to yellow and vice versa during heating and after cooling, respectively

4: Physical change- The dissolution of common salt

5: Chemical change - The hardening of cement by the absorption of carbon (Iv) oxide​

1: The addition of water to quicklime (slaking of lime) is a chemical change. It involves a chemical reaction between calcium oxide (quicklime) and water to form calcium hydroxide (slaked lime). This reaction is exothermic and produces heat.

2: The melting of candle wax is a physical change. It involves a phase transition from a solid state to a liquid state due to the application of heat. The chemical composition of the wax remains unchanged during this process.

3: The change in color of zinc oxide from white to yellow and vice versa during heating and cooling is a physical change. It is a reversible process caused by the alteration of the crystal structure of zinc oxide. The change in color is due to the absorption or release of energy during the heating and cooling processes, respectively.

4: The dissolution of common salt (sodium chloride) is a physical change. It involves the separation of ionic bonds between sodium and chloride ions in the solid salt and their subsequent dispersal in water. The chemical composition of the salt remains the same; it simply forms a homogeneous mixture with water.

5: The hardening of cement by the absorption of carbon dioxide (CO2) is a chemical change. It involves a chemical reaction known as carbonation, where carbon dioxide reacts with the calcium hydroxide in cement to form calcium carbonate. This reaction leads to the formation of new chemical compounds and a change in the structure and properties of the cement, resulting in its hardening or curing process.

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The compound most likely formed with magnesium, Mg, is MgX . The correct option is (A) MgX.

The electronic configuration of the element, X is 2,8,7. Since X is located in group 7 of the periodic table, it has 7 electrons in its valence shell. In order to obtain a stable configuration, the atom can either gain one electron to fill the 3rd energy level completely or lose seven electrons to completely empty the 2nd energy level, which is easier. The resulting ion, X-, would have a stable electronic configuration of 2,8. Hence, the compound most likely formed with magnesium, Mg, is MgX .The correct option is (A) MgX.

Explanation: Magnesium is located in group 2 of the periodic table and has two valence electrons in its outermost shell. It loses these two electrons to form Mg2+ ions with stable electronic configurations of 2,8. On the other hand, element X gains an electron to form X- ions with stable electronic configurations of 2,8.The combination of Mg2+ and X- ions results in the formation of the compound MgX with a neutral charge.

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Answer:

1. three-dimensional bonding

Diamond

2. Hardest natural substance

diamond

3. Used as lubricant

Graphite

4. nonconductor

Diamond

5. Weak, planar bonds

Graphite

6.Carbon black or soot

Amorphous

Explanation;

sorry im late, hopefully this can help somebody :)

Answer:

The equilibrium concentration of I₂ is 0.400 M  and HI is 1.20 M, the Keq will be 0.112.

Explanation:

Based on the given information, the equilibrium reaction will be,  

2HI (g) ⇔ H₂ (g) + I₂ (g)

It is given that 4.00 mol of HI was filled in a flask of 2.00 L, thus, the concentration of HI will be,  

= 4.00 mol/2.00 L

= 2.00 mol/L

Based on the reaction, the initial concentration of 2HI is 2.00, H₂ is 0 and I₂ is O. The change in the concentration of 2HI is -x, H₂ is x and I₂ is x. The equilibrium concentration of 2HI will be 0.200-x, H₂ is x and I₂ is x.  

It is given that at equilibrium, the concentration of H₂ or x is 0.400 M.  

Now the equilibrium concentration of HI will be,  

= 2.00 -2x  

= 2.00 - 2 × 0.400

= 1.20 M

The equilibrium concentration of I₂ will be,  

I₂ = x  

= 0.400 M

The equilibrium constant (Keq) will be,  

Keq = [H₂] [I₂] / [HI]²

= (0.400) (0.400) / (1.20)²

= 0.112

Thus, the Keq of the reaction will be 0.112.  

ANSWER

EXPLANATION

Firstly, we need to define the word titration.

Titration is defined as a technique that is used to determine the known concentration of an unknown solution.

This normally occurs between an acid and a base

During titration, an indicator changes color when equilibrium has been attained between the two solutions. The solutions are normally acid and base. At equilibrium, the number of moles of acid is equal to the number of base.

Therefore, the correct answer is option C

Option C. is a molecule of hydrocarbon.

Hydrocarbons are organic compounds made up of only hydrogen and carbon atoms. They are the building blocks of organic chemistry and are the main component of fossil fuels such as coal, oil, and natural gas.

Molecules of hydrocarbons can be simple or complex, and can exist as gases, liquids, or solids. Some common examples of hydrocarbon molecules include methane (CH₄), ethane (C₂H₆), propane (C₃H₈), and butane (C₄H₁₀). Alkanes, alkenes, and alkynes are all types of hydrocarbons that have different chemical and physical properties based on the arrangement of their atoms.

Therefore, the correct answer is as given above. It could then be concluded that only option C is made up of hydrogen and carbon atoms.

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Answer:

HCl acts as an excess reagent

Explanation:

The reaction equation is;

PbO + 2HCl → PbCl2 + H20

Number of moles of PbO = 13g/223.2 g/mol = 0.058 moles

Since the mole ratio is 1:1, 0.058 moles of PbCl2 is produced

Number of moles of HCl = 6.4 g/36.5g/mol = 0.175 moles

2 moles of HCl yields 1 mole of PbCl2

0.175 moles yields 0.175 moles * 1/2

= 0.0875 moles of PbCl2

Hence; PbO yields the least number of moles of product so it is the limiting reactant and HCl is the reactant in excess

Two equal expressions combine to make an equation. It takes 7.5 gallons and 12.5 gallons, respectively, of 20% milk and 12% milk to blend them.

When two equal phrases are added together with the aid of the equal sign "=," an equation is created.

Briefing :

Let the amount of 20%milk mixed be represented by x, while the amount of 12% milk mixed is represented by y. Therefore, the two-equation can be written as,

               x + y=20 gallons

0.20x + 0.12y = (0.15×20)

Solve the first equation for x, therefore,

x = 20 - y

substitute the value of x in the second equation,

0.20(20-y) + 0.12y = 3

     4 - 0.2y +0.12y = 3

                  -0.08y = -1

y = 12.5 gallons

substitute the value of y in the first equation,

x + 12.5 = 20

         x = 7.5 gallons

Hence, the amount of 20% milk and 12% milk that is needed to be mixed is 7.5 gallons and 12.5 gallons, respectively.

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Mass of KNO₃ : = 40.643 g

Given

28.5 g of K₃PO₄

Required

Mass of KNO₃

Solution

Reaction(Balanced equation) :

2K₃PO₄ + 3 Ca(NO₃)₂ = Ca₃(PO₄)₂ + 6 KNO₃

mol K₃PO₄(MW=212,27 g/mol) :

= mass : MW

= 28.5 : 212,27 g/mol

= 0.134

Mol ratio of K₃PO₄ : KNO₃ = 2 : 6, so mol KNO₃ :

= 6/2 x mol K₃PO₄

= 6/2 x 0.134

= 0.402

Mass of KNO₃ :

= mol x MW KNO₃

= 0.402 x 101,1032 g/mol

= 40.643 g

Answer:

Chemical reactions list reactants and products in molar amounts, not just molecular amounts. We can use the coefficients of a balanced chemical equation to relate moles of one substance in the reaction to moles of other substances

Explanation:

Answer:

C I'm pretty sure

Explanation:

uhhhhhhhhh yes

The procedure by which H₃O⁺ or OH⁻ is converted to pH is to use the given formulas below:

The relationship between H₃O⁺ (hydronium ion), OH⁻ (hydroxide ion), and pH is given below:

In an aqueous solution, water molecules ionize resulting in the formation of hydronium ions (H₃O⁺) and hydroxide ions (OH⁻) according to the following equilibrium:

H₂O + H₂O ⇌ H₃O⁺ + OH⁻

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