A student conducts a titration to determine the molarity of a hydrochloric acid solution. HCl(aq), by reacting it with a standardized stock solution of sodium hydroxide NaOH(aq). The student uses 10 mL of the unknown acid and titrates to the end point of the indicator. The student calculate the percent error of the molarity of the acid to be 35%. which of the following could account for the largest percent error?

Answer:

hope this helps

Explanation:

it has to do with crystallization in the wax. When solid, the long alkyl chains align and crystallize, and these crystallites scatter light which leads to higher opacity. When heated, the crystallites melt, and the resulting amorphous liquid no longer scatters light.

Answer:

Atomic models are important because, they help us visualize the interior of atoms and molecules, and thereby predicting properties of matter.

Explanation:

We study the various atomic models in our course of study because, it is important for us to know, how did people come to the present concept of an atom. How did physics evolve from classical to quantum physics.

All these are important for us to know and thus, knowledge about various atomic models, their discoveries and drawbacks and finally improvements based on scientific evidence present at that time is important for us to understand the underlying theory very well.

Explanation:

A DAY IN THE LIFE OF METIS JOURNAL. I WROTE IT HOPE U LIKE IT XD

We, who live in the west, were Nomadic. So we always moved from place to place to hunt buffalo and other fur-bearing animals. And now again we have to shift everything we collected , like, all the essential needs we collected. It’s really hard to shift stuff, But when you move to a new place you get to see new beautiful places. They are just so satisfying to see! It’s like all my work(like the shifting work) is paid off. I love it! We always meet the Hudson’s bay company employees, and give them furs which we took from the bissons and other furry animals we hunted. And in exchange they give us their (Hudson’s Bay company) goods. Which is good! Because then we or I won't be able to enjoy that delicious pemmican!

 The one reason that makes me proud of my parents is that because of them I am like a translator for both sides in the fur trade! Anyways coming back to the present. As I said before, we were moving today to another place, But on the way some people along with my father will ride the famous York boats carrying supplies to fur posts. I begged my father to take me with him! And as usual he gave me some silly reason for me to stay. And now since I don’t have anything to do I will-..Nevermind, My mom’s calling me. Okay after helping my mom keep the fur posts into the York boats me , my mom, and the others are just relaxing and enjoying nature just to take a break. Since, I am so obsessed with my Journal notebook today I’m just going to sit here and right what comes to my mind. I’m not like the others who always seem to be talking with someone. I like my own space! 

I kind of miss my dad already, but he and his fellow members need to travel the waterways from the red river further west and north to hudson bay. These red river carts also travel the trek back and forth over land to St. Paul, Minnesota and to posts in saskatchewan.  Speaking about the red river, the only large settlement in the region is the red colony. About 12000 people lived in this colony around Fort Garry. Some were the original Selkirk settlers or their descendents. They had come from Scotland with lord Selkirk when he established the colony in 1811. Many of these original settlers were poor farmers who had been displaced  from their lands in scotland. They had endured many hardships in the early years of settlement, including foods, hunger, and sickness. I love studying about other colonies, cultures , history etc.

The volume of the gas at 6.0 °C is 416.8 mL.

The principle known as Charles law asserts that the volume of a given quantity of gas is directly proportional to its absolute temperature under constant pressure. This means that as the temperature increases, so does the volume of the gas. Conversely, when the temperature decreases, so does the volume. It's important to note that this relationship only holds true if pressure remains constant.

Using Charles law

V1/T1 = V2/T2

Where:

V1 = initial volume of gas

T1 = initial temperature of gas

V2 = final volume of gas

T2 = final temperature of gas

Converting the initial and final temperatures from Celsius to Kelvin

T1 = 12.0 + 273.15 = 285.15 K

T2 = 6.0 + 273.15 = 279.15 K

Plugging in the values

V1/T1 = V2/T2

425.0 mL / 285.15 K = V2 / 279.15 K

V2 = (425.0 mL / 285.15 K) * 279.15 K

V2 = 416.8 mL (rounded to three significant figures)

To know more about Charles Law, click here

https://brainly.com/question/16927784

#SPJ1

Answer:

true

Explanation:

Students often have no experience with the idea that some things (particles) can’t be divided. If sand is ground up into tiny pieces it is still sand. There seems no reason why the dividing can’t keep on going to smaller and smaller pieces. This is often described as a continuous view of matter.

Even when children are introduced to the idea of matter being made of particles, most consider there is still ‘stuff’ between the particles and that something like air fills the empty space. After all, when liquid is poured from a glass so that it is empty it still contains air.

These ideas are further explored in ‘Hannah’s Question,’ a classroom practice vignette.

Research: Loughran, Berry, Mulhall & Gunstone (2001), Novick & Nussbaum (1981)

Particles are often assumed to behave in the same way as the substances they make up. For example students can believe that particles themselves can swell, shrink and melt or that the particles in stone are harder than the particles in rubber. Many students consider that ice molecules melt to little droplets of water.

Scientific view

The properties of matter can best be explained using a model in which all materials are composed of tiny particles (atoms, molecules and ions).

There is empty space between particles and particles are constantly moving (their speed is changed by temperature). The particles in solids and liquids are quite close to each other, while those in gases are a very long way apart. (There is commonly an increase in volume of at least 1000 fold when substances move from solid or liquid to gas).

Changes of state involving solids, liquids and gases as well as a range of other phenomena can be explained by changes in arrangement and speed of the particles.

Answer: Helium: atomic number 2. EC 2

Neon: atomic number 10. EC 2,8

hydrogen: atomic number 1. EC 1

magnesium: atomic number 12. EC 2,8,2

chlorine: atomic number 17. EC 2,8,7

Aluminum: atomic number 13. EC 2,8,3

Explanation: hope this helped

Answer:

Different elements emit differently colors of light because when electrons return to the lower energy levels, they emit energy in a different form of light

Explanation:

The given statement "atomic size decreases across a period due to an increase in the effective nuclear charge, Zeff" is true because Zeff causes the valence electrons to be more strongly attracted to the nucleus resulting in decreased atomic size.

As you move across a period, the number of valence electrons in the outermost shell increases, but the number of energy levels or shells remains the same. This means that the electrons are being added to the same shell and are therefore at roughly the same distance from the nucleus. However, the effective nuclear charge (Zeff) increases across the period due to the increasing number of protons in the nucleus. This causes the valence electrons to be more strongly attracted to the nucleus and held more tightly, resulting in a decrease in atomic size across the period.

Therefore the given statement "atomic size decreases across a period due to an increase in the effective nuclear charge, Zeff" is true.

To learn more about periodic properties refer to: https://brainly.com/question/31232139

#SPJ11

Oxygen gas (O2) is composed of two oxygen atoms connected together, while ozone (O3) is composed of three oxygen atoms. The two molecules have very different effects on us. Oxygen gas is essential for human life and is a vital part of the air we breathe. Ozone, on the other hand, can be toxic in high concentrations and can cause adverse health effects, including irritation of the respiratory system and damage to the lungs.

Chemical Structure is the spatial arrangement of atoms in a molecule. Chemical structure determines the molecular geometry of the molecule. Russian Chemist Alexander Butlerov acknowledged that molecules are not random clusters of atoms and functional groups but are arranged in a concrete pattern.

For such more questions on Chemical Structure :

brainly.com/question/11565397

#SPJ11

An ICE (Initial, Change, Equilibrium) table is simple matrix formalism that used to simplify the calculations in reversible equilibrium reactions (e.g., weak acids and weak bases or complex ion formation).

In most cases, ICE tables are used to calculate the K, or equilibrium constant expression, of a reaction (in some cases, K may be given, and one or more of the concentrations in the table will be the unknown to be solved for). ICE tables are made up of the concentrations of molecules in solution at various stages of a reaction. The variables and constants required to calculate the unknown are automatically set up and organized in ICE tables.

The first column of the table's titles are abbreviated as ICE.

Initial focus is denoted by the letter I. The initial product and reactant concentrations are listed in this row.

know more about ICE table click here;

https://brainly.com/question/30395953?referrer=searchResults

#SPJ4

The following are characteristics of ideal chemical sanitizer except: Option A. Approved for food contact surface application and option C. High in toxicity and corrosivity

Chemical substances that are capable of eradicating disease-causing microorganisms are also used to sanitize. Chlorine (bleach), iodine, and quaternary ammonium are common sanitizers. Chemical disinfectants are widely used in the food service sector.

The most often used sanitizers are those that contain chlorine. They work well against all bacteria and are reasonably priced. The ideal temperature range for bleach is between 55°F and 75°F. Hot water reduces the effectiveness of bleach. In diluted form, quaternary ammonium compounds are tasteless, colorless, and harmless.

Hospitals mostly employ the following five EPA-registered substances as disinfectants at the moment: quaternary ammonium, hypochlorite, accelerated hydrogen peroxide, phenolics, and peracetic acid.

To learn more about chemical sanitizer Please click on the given link:

https://brainly.com/question/8297409

#SPJ4

The nursing approach that is most helpful to a client with Parkinson's disease experiencing freezing of gait and difficulty initiating movement is the "cueing" approach.

Cueing involves providing external prompts or cues to assist the client in overcoming freezing episodes and initiating movement. This approach helps to bypass the neurological impairments associated with Parkinson's disease and facilitates smoother and more coordinated gait patterns. Some effective cueing strategies that can be employed by nurses include: Visual cues: Placing brightly colored markers or stepping stones on the floor can help guide the client's footsteps and provide a visual target for stepping. It can help overcome freezing and encourage forward movement. Auditory cues: Providing rhythmic sounds, such as a metronome or music with a steady beat, can help establish a cadence and encourage a more regular gait pattern. The client can synchronize their steps with the auditory cue. Tactile cues: Gentle touch or pressure on the client's arm or back can provide a tactile cue to initiate movement. The nurse can lightly guide or propel the client forward during freezing episodes. Verbal cues: Using simple and clear verbal instructions or commands, such as "step" or "walk," can help trigger movement and prompt the client to initiate walking. Dual-tasking: Engaging the client in a secondary task, such as counting or carrying an object, can help shift attention and distract from freezing episodes, thereby facilitating smoother movement.

Learn more about Parkinson's disease here:

https://brainly.com/question/13508690

#SPJ11

The scientist must be studying the Helium quarks.

Charged particles, such protons or electrons, are propelled at high speeds that are very close to the speed of light by an accelerator. Then, they are smashed either onto a target or onto other particles moving the other way. 

Quarks and electrons are the two categories of fundamental particles that make up an atom.

An atom's nucleus is surrounded by an area of electrons. The electrical charge of every electron is negative one.

Protons and neutrons, which together make up an atom's nucleus, are made of quarks. Three quarks are found in each proton and neutron.

A fast-moving point of energy is a quark. Quarks come in a variety of types. Up quarks and down quarks are the two types of quarks that make up protons and neutrons.

The most basic and elementary component of matter is the quark. It is clear that the scientist is examining the quarks inside the proton when high energy particles are bombarded in the helium nucleus to analyze the particles inside. Two up quarks and one down quark are found in a proton.

Learn more about quarks here:

https://brainly.com/question/1444547

#SPJ4

The change in temperature with the addition of Ar to He gas is 68.61 K. The negative change indicates the lowering of the temperature of gas.

The pressure of an ideal gas is given by the ideal gas equation as:

PV=nRT

The initial temperature of He gas is given as:

Substituting the values for initial temperature, \(T_i\):

\(T_i=\rm \dfrac{1.83\;atm\;\times\;2.50\;L}{0.458\;mol\;\times\;0.082\;J/mol.K} \\\textit T_\textit i=122\;K\)

The initial temperature of the gas is 122 K.

The addition of 0.713 mol Ar, results in the final values of:

Substituting the values for final temperature, \(T_f\):

\(T_f=\rm \dfrac{2.05\;atm\;\times\;2.50\;L}{1.171\;mol\;\times\;0.082\;J/mol.K} \\\textit T_\textit f=53.3\;K\)

The final temperature of the gas is 53.3 K.

The change in temperature (\(\Delta T\)) is given as:

\(\Delta T=T_f-T_i\\\Delta T=53.3-122\;\text K\\\Delta T=-68.61\;\text K\)

The change in temperature of the gas is 68.61 K. The negative sign indicates the lowering of temperature with the addition of Ar.

Learn more about ideal gas, here:

https://brainly.com/question/8711877

Answer:

answer in picture

Explanation:

4.68L is the final volume.

The volume of a gas is inversely proportional to its temperature when pressure is held constant. This means that when the temperature of the gas is decreased, its volume will increase.

Therefore, the final volume of the 17.0 L of carbon dioxide will be greater than 17.0 L after it is cooled from 38°C to 5°C.

The equation to calculate the final volume is:

\(V2 = V1 * (\frac{T2}{T1})\)

where T1 is the starting temperature, T2 is the ending temperature, V1 is the starting volume, and V2 is the finished volume.

Using this equation, the final volume of the carbon dioxide can be calculated as:

\(V2 = 17.0 L * (\frac{5\°C}{38\°C}) \\V2= 4.68 L\)

Therefore ,The Final volume is 4.68L

learn more about carbon dioxide Refer:brainly.com/question/13229518

#SPJ1

Answer:

Run Off

Explanation:

The 2. 25g of a sample of an oxide of copper on reduction gave 2. 0g of copper. The chemical formula  will be Cu₂O

we know that 2.25 g of copper oxide gave 2 g of copper.

Mass of copper oxide =2.25 g

Mass of copper  =2.0 g

∴ Mass of oxygen =2.25−2.0=0.25

Moles copper = mass/ mass molar = 2.25/ 63.5g/mol = 0.0354

Moles oxygen = mass/ mass molar = 0.25/ 16 g/mol = 0.0156

The ratio of moles of copper and oxygen = 0.0354 : 0.0156 =2:1

so the formula of  2. 25g of a sample of an oxide of copper on reduction gave 2. 0g of copper will be Cu₂O

Learn more about copper oxide at https://brainly.com/question/24728770

#SPJ4

Answer:

116 km/h

Explanation:

We know that km/h means Kilometers an hour. And if this is constant, then he will travel 116 km/h.

Answer:

During the recharge process, the water infiltrates at the land's surface and flows through the unsaturated zone. It then crosses the water table and enters the groundwater system. Chloride (NaCl) is important and necessary because the sodium ions are held loosely and exchanged easily with calcium and magnesium ions.

Explanation:

Leucine and Valine are the two amino acids that are commonly found at position 6 of the beta-globin protein. If either of these is replaced by another amino acid, it can result in the sickling of red blood cells in individuals with sickle cell disease.

Therefore, the amino acids that could produce a similar sickling effect if placed at position 6 are Leucine.
In the context of sickle cell anemia, the amino acid substitution at position 6 involves replacing glutamic acid with valine. This change causes the sickling effect. To produce a similar effect, the substituted amino acid should have similar properties to valine, which is hydrophobic.

Considering the given amino acids:

1. Aspartate - not likely, as it is polar and negatively charged.
2. Alanine - possible, as it is hydrophobic like valine.
3. Leucine - possible, as it is hydrophobic like valine.
4. Lysine - not likely, as it is polar and positively charged.
5. Arginine - not likely, as it is polar and positively charged.

Your answer: Alanine (2) and Leucine (3) are the amino acids that would likely produce a similar sickling effect if placed at position 6.

Visit here to learn more about Leucine brainly.com/question/30802709
#SPJ11

Explanation:

T1 = 27C + 273 = 300K

P1 = 200 kPa

P2 = 223 kPa

T2 = ?

According to Gay-Lussac's law:

P1/T1 = P2/T2

(200 kPa/300 K) = (223 kPa/T2)

T2 = (223 kPa/200 kPa)(300 K)

= 334.5 K

= 61.5°C

Answer: 3.156 * 10^7

Explanation: I do not really understand your question. You answered it yourself!

Scientific notation shortens large numbers. The number right after the decimal point can only be between 1 and 9, which you did correctly. When converting to scientific notation, the exponent of ten is based on how many places you moved the decimal and the direction you moved it (left, positive; right, negative). In this case, the exponent of ten is a positive seven.

You did everything correctly :) Good job!

Answer:b

Explanation:

The function of the outer covering of a plant is to help reduce water loss, option B. The outer covering of a plant is known as the epidermis, and it serves as a protective layer that helps to prevent excessive water loss through transpiration.

The epidermis may  contain specialized structures such as stomata and trichomes, which further regulate water loss and protect the plant from environmental stresses such as insect predation and UV radiation.

Option A, "A plant's outer covering is involved in reproduction," is incorrect because the reproductive structures of plants are typically located within the plant's interior, not on the outer surface.

Option C, "A plant's outer covering is for preying on other plants," is incorrect because plants are not capable of actively preying on other plants.

Option D, "A plant does not have an outer covering," is incorrect because all plants have an outer covering in the form of the epidermis or a similar structure.

Hence, option B is correct.

Find more on plant's outer covering:

https://brainly.com/question/29817369

#SPJ3

The force equal but opposite to the one shown is : ( D ) The force that the branch applies to the kitten

The force of gravity/weight of an object is equal and opposite to the reactive force because it cancels the effect of the weight of the object on the surface. In option D the force that the branch applies to the kitten resting on it is equal and opposite to the weight of the kitten.

Hence we can conclude that The force equal but opposite to the one shown is  The force that the branch applies to the kitten.

Learn more about reactive forces : https://brainly.com/question/1013858

#SPJ1

Your questio lacks the diagram but I have provided a general answer within the contest of your question

Answer:

Sorry i might be wrong but I believe the answer is evaporation

Explanation:

Its says the diagram So is there a diagram u can show us?

Answer:

physical change, because a new substance is formed

Explanation:

Answer:

43.1atm is the pressure using gas law and 27.2atm using Van der Waals Law.

Explanation:

Ideal gas law is:

PV = nRT

Where P is pressure in atm

V is volume = 4.00L

n are moles of the gas (For chlorine Molar Mass: 70.90g/mol):

500g * (1mol / 70.90g) = 7.052 moles

R is gas constant = 0.082atmL/molK

T is absolute temperature = 25°C + 273 = 298K

To solve the pressure, P:

P = nRT/V

P = 7.052mol*0.082atmL/molK*298K / 4.00L

P = 43.1atm is the pressure using gas law.

Van der Waals equation is:

\(P + a(\frac{n}{V})^2 * (V-nb) = nRT\)

Where a is 6.58L²atm*mol⁻²

b = 0.056Lmol⁻²

Solving for pressure:

\(P + a(\frac{n}{V})^2 = \frac{nRT}{(V-nb)}\)

\(P = \frac{nRT}{(V-nb)}-a(\frac{n}{V})^2\)

\(P = \frac{7.052mol*0.082atmL/molK*298K}{(4.00L-7.052mol*0.056L*mol)}-6.58L^2mol^{-2}(\frac{7.052mol}{4.00L})^2\)

P = 172.323 / 3.6051 - 20.4866

P = 27.2atm using Van der Waals Law

Answer:

synthesis reaction

Explanation:

synthesis reaction where reactants unite to form a single product.

The steps to make chocolate so that it does not melt on my hands are: heat the chocolate up to 120 degree fahrenheit and then after removing the bowl cool down it below 80 degree fahrenheit.

The main reasons to temper chocolate are:

1. Tempered chocolate is firm and solid in nature at room temperature. This is critical when making the chocolate confections or decorations. Chocolate which is out of temper requires refrigeration to maintain its shape.

2. The appearance of tempered chocolate is much better than that of its un-tempered counterpart. Tempered chocolate is smooth in nature , shiny and evenly colored.

3. Chocolate that is not been tempered has a distinctly dull appearance and may develop fat bloom -- grayish-white spots on the surface of the chocolate where unstable beta crystals have gathered.

To know more about melting, visit here:

https://brainly.com/question/15873508

#SPJ4