Both amines and amides are derivatives of
acetic acid
sodium hydroxide
ammonia
sodium chloride

Answer:

47.25 moles

Explanation:

First we find the amount of O2 in mass in air

That will be = (21/100) x 3.6

This will give us=0.756 kg

Now we want to find the moles, so we convert this mass into grams since we are going to be working with grams= 0.756 x 1000 = 756 grams

Now, to find the number of moles:

moles= mass / molar mass

in this case mass is 756 grams and molar mass of oxygen is 16

So, the mass divided by molar mass would be =756/16= 47.25 moles of O2

Answer:

The electricity that flows to our homes is generated in the power station from here it flows through large transmission line which carry it to substations finally distribution carry electricity from substations to homes schools etc

Answer:

A liquid freezes into a solid or any other state change is a physical change. Bubbles are produced upon mixing two solutions is a Chemical change as gas formed. a precipitate is formed from two solutions is a Chemical change  The conversion of a substance to another compound over time leads to a color change of the substance due to the insolubility of the compound.

It is a chemical change or properties. A solution that heats up upon mixing with another is a Chemical change known as an exothermic reaction. dissolving the substance in a liquid is a physical change physical that can be regained by evaporation or crystalization.

Answer:

Answer: When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. Solid water, or ice, is less dense than liquid water. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density.

Explanation:

Answer:

Types of Chemical Reactions

Synthesis reactions. Two or more reactants combine to make 1 new product. ...

Decomposition reactions. A single reactant breaks down to form 2 or more products. ...

Single-replacement reactions. A single element replaces a similar element of an adjacent reactant compound. ...

Double-replacement reactions. ...

Combustion reactions.

Explanation:

Answer:

A forensic palynologist is a spore and pollen expert that helps solve crimes.

The case that Mildenhall worked on was about a murder that involved a prostitute. The police couldn’t find a trace to help solve the case, so they called Mildenhall to help with pollen clues. He was able to find trace evidence in the pollen, which helped police connect the victim to a gang hangout by the crime scene.

A forensic palynologist can help with a criminal investigation by comparing pollen from the suspect and the victim using a comparison microscope to determine if the pollen matches.

The challenges of using a forensic palynologist in a criminal investigation are that judges and juries may have a hard time understanding palynologists.

Explanation:

Answers of the following points regarding forensic palynologist are given below:

This is a internal branch of palynology that deals with the relationship among different objects to prove or disprove, which may belongs to both criminal and civil cases.

(1). Forensic palynologist is a person who do the case study of the crime seen,  and deals with a spore and pollen.

(2). Mildenhall worked on a murder case in New Zealand where a prostitute was involved. Police were not able to solve the crime, so they called Mildenhall to help with pollen clues. Mildenhall who is a spore and pollen expert was able to study the pollen clues and gave hint to the police as they were do further process to connect with the victim.

(3). A forensic palynologist by comparing the pollen clues from the crime scene and the victim, can help with a criminal investigation by using a comparison microscope to determine if the pollen matches.

(4). As forensic palynology is a science study which can not be general understand by normal people; so that judges, juries and advocates may have a hard time understanding palynologists and this is the challenges of using a forensic palynologist in crime investigations.

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Answer:

Explanation:

The main difference between these two is that a star has a solid rock and gas surface, while a comet has tail of dust and gas. A star is a giant mass of rock and gas that follows a set eliptical path. Comets on the other hand are made of ice and dust with some gases and usually travel in a straight path. This is why they have a tail of dust and gas which is the ice burning up behind it as it travels at extremely high speeds.

Answer: A: A star has a solid rock and gas surface, while a comet has tail of dust and gas.

Explanation:

1.54 × 10²⁴ atoms He

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[Given] 2.56 moles He

[Solve] atoms He

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.54163 × 10²⁴ atoms He ≈ 1.54 × 10²⁴ atoms He

Answer:

2NaN₃ → 2Na + 3N₂

Explanation:

First we use the information given by the problem to write an unbalanced equation:

There are 3 N atoms on the left side and only 2 on the right, to remedy that we put a 2 coefficient on NaN₃ and a 3 coefficient on N₂:

Now there are 6 N atoms on both sides of the equation. What's left is to balance Na atoms:

The equation is now balanced.

The properly balanced chemical equation for this chemical reaction is given by [tex]2NaN_3 \rightarrow 2Na + 3N_2[/tex]

A balanced chemical equation can be defined as a chemical equation wherein the number of atoms on the reactant side (left) is equal to the number of atoms on the product side (right).

In this scenario, Sodium azide ([tex]NaN_3[/tex]) undergoes a decomposition reaction due to an electrical impulse, which causes it to produce elemental sodium and nitrogen gas.

The properly balanced chemical equation for this chemical reaction is given by:

                                      [tex]2NaN_3 \rightarrow 2Na + 3N_2[/tex]

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Answer:

7.08

Explanation:

To solve this problem we'll use the Henderson-Hasselbach equation:

Where [tex]\frac{[A^-]}{[HA]}[/tex] is the ratio of [sodium formate]/[formic acid] and pka is equal to -log(Ka), meaning that:

We input the data:

And solve for [tex]\frac{[A^-]}{[HA]}[/tex]:

The ratio of [sodium formate] to [formic acid] needed to make the buffer is 7.08

pKa = –Log Ka

pKa = –Log 1.8×10¯⁴

pKa = 3.74

pH = pKa + Log[sodium formate]/[formic acid]

4.59 = 3.74 + Log[sodium formate]/[formic acid]

Collect like terms

4.59 – 3.74 = Log[sodium formate]/[formic acid]

0.85 = Log[sodium formate]/[formic acid]

Take the anti-log of 0.85

[sodium formate]/[formic acid] = anti-log 0.85

[sodium formate]/[formic acid] = 7.08

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Answer:

An infographic is a collection of imagery, charts, and minimal text that gives an easy-to-understand overview of a topic. As in the example below, infographics use striking, engaging visuals to communicate information quickly and clearly. Infographics are a valuable tool for visual communication.

Answer: The molecular weight of tris buffer is 121 g/mol

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n}{V_s}[/tex]

where,

n = moles of solute

[tex]V_s[/tex] = volume of solution in L

moles of tris buffer = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{12.1g}{Mg/mol}[/tex]

Now put all the given values in the formula of molality, we get

[tex]0.1=\frac{12.1g}{Mg/mol\times 1L}[/tex]

[tex]M=121g/mol[/tex]

Therefore, the molecular weight of tris buffer is 121 g/mol

A mixture of water and non-dissolved materials is called a heterogeneous mixture.

A heterogeneous mixture is a mixture that contains two or more substances that are not uniformly distributed throughout the mixture.

In a mixture of water and non-dissolved materials, the non-dissolved materials are not uniformly distributed throughout the water. Instead, they will settle to the bottom of the container over time.

Therefore, heterogeneous mixture is a mixture of water and non-dissolved materials.

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they are impacted because people loose their home due to the wreckage that has happend and landscapes are ruined due to landslides

Answer:

Well the landscape is torn up, it goes through quite a bit of damage. the plants, animals, and water are all affected by it. when a earth quake hits it destroyes most everything, houses fall into the ground and are destroyed, people die. Earthquakes destry electrical wires and many other things

Explanation:

Sorry I did not answer it full, but you can look it up online.

Answer:

[tex]KClO_3[/tex]

Explanation:

Hello!

In this case, as we know the mass of the total sample, we can first compute the mass of oxygen:

[tex]m_O=22.9g-7.33g-6.65g=8.92g[/tex]

Next, we compute the moles of each element:

[tex]n_K=\frac{7.33g}{39.9g/mol}= 0.184mol\\\\n_{Cl}=\frac{6.65g}{35.45g/mol}=0.188mol \\\\n_O=\frac{8.92g}{16.00g/mol} =0.5575mol[/tex]

Now, we divide the moles by 0.184 moles, the fewest ones, to obtain:

[tex]K=\frac{0.184}{0.184}=1.0 \\\\Cl=\frac{0.187}{0.184}=1.0\\\\O=\frac{0.5575}{0.184} =3.0[/tex]

Therefore, the empirical formula is:

[tex]KClO_3[/tex]

Regards!

Answer: Thus the correct option is  D. All of the above describe a mole

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass in grams.

1 mole of every substance contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

Mole is the S.I unit for measuring the amount of substance. It is often used to measure large number of particles.

Thus the correct option is  D. All of the above describe a mole

Answer:

reactants

Explanation:

please give brainlist

Answer:

Reactant

Explanation:

Answer:

the subject of a talk, piece of writing, exhibition, etc.; a topic.

Explanation:

Answer:

1 NH4NO3(s) → 1 N2(g) + 4 H2O(g) + 2 O2(g)

Explanation:

Answer:

10.53 moles ZnCl2

Explanation:

Im pretty sure its C

Answer:

H^+(aq) + OH^-(aq) --------> H2O(l)

Explanation:

We must first obtain the molecular equation, the net ionic equation before we obtain the net ionic equation.

The molecular reaction equation is;

HF(aq) + NaOH(aq) -------> H2O(l) + NaF(aq)

The complete ionic equation is;

H^+(aq) + F^-(aq) + Na^+(aq) + OH^-(aq) --------> H2O(l) + Na^+(aq) + F^-(aq)

The net ionic equation is;

H^+(aq) + OH^-(aq) --------> H2O(l)

Answer:

See explanation

Explanation:

The ability of a gas to function as a green house gas depends on its ability to absorb infra red rays. In turn, the absorption of infrared red rays depends on whether or not the molecule is IR active.

The triatomic molecules such as methane and water are IR active. Only IR active molecules can lead to green house effect.

Note that for a molecular vibrational mode to be IR active, the dipole moment of the molecule is changed as the vibration occurs .

Answer:

0.0258 mol Answer .......

Answer:

strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other.

Explanation:

In liquids, the attractive intermolecular forces are strong enough to hold molecules relatively close together but not strong enough to keep molecules from moving past each other.

Intermolecular forces are the forces of repulsion or attraction.

Intermolecular forces lie between atoms, molecules, or ions. Intramolecular forces are strong in comparison to these forces.

In liquids, the attractive intermolecular forces are strong enough to hold

molecules relatively close together but not strong enough to keep

molecules from moving past each other.

Liquid is a state of matter in which the atoms are relatively close to each

other but less than that of solids which are densely and tightly packed.

The intermolecular force in liquids are strong enough to hold them together

which makes them less easily compressible but not strong enough to keep

them from moving or gliding past each other because they aren't tightly

packed.

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In an ecosystem , watershed is the name for the land area where all rain runs downhill to a certain point.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

780 moles e⁻

Explanation:

N⁺⁵ in NO₃⁻ requires 2(5e⁻)  => 1/2 mole N₂(g)

That is, NO₃⁻ + 2(5e⁻/mole N₂ formed) => 1/2N₂

NO₃⁻ + 10e⁻/mole N₂ formed => 1/2N₂

∴ 78 mole NO₃⁻ requires 780 moles e⁻  => 1/2(78) moles N₂ = 39 moles N₂

Denitrification is the reduction of nitrate to dinitrogen gas. It is achieved by denitrifying organism According to stoichiometry, 390 moles of electrons are required to reduce  78 moles of nitrate to dinitrogen gas.

The equation of denitrification;

2 NO3− + 10 e− + 12 H+ → N2 + 6 H2O

From this equation;

2 moles of nitrate requires 10 moles of electrons

78 moles of nitrate requires 78 * 10/2 = 390 moles of electrons

Hence, 390 moles of electrons are required to reduce  78 moles of nitrate to dinitrogen gas.

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Answer:

The volume required for the titration is 20.49mL.

Explanation:

In a titration of an acid, you must fill the burette until a particular volume (In the problem, the burette is filled until 2.49mL).

Then, when the titration is ran, the final volume helps to find the volume required to the titration as follows:

Volume of titration = Final Volume - Initial volume

Volume of titration = 22.98mL - 2.49mL = 20.49mL