You need to get to class, 300 meters away, and you can only walk in the hallways at about 1.5m/s.(if you run any faster, you’ll get caught running). How much time will it take to get to your class

We intend to prepare 500 ml of a 0.1m solution of NaCl, but you forget to remove the stir bar when we bring the solution to volume. the stir bar has a volume of 1 ml and weighs 4 g, the percent error in our molarity is 0.2%.

Percent errors indicate how big our errors are when we measure something in analysis process. Smaller percent errors indicate that we are close to accepted or original value.

For example, a 1% error indicates that we got very close to accepted value, while 48% means that we were quite a long way off from the true value. Measurement errors are often unavoidable due to certain reasons like hands can shake, material can be imprecise, or our instruments just might not have capability to estimate exactly.

The percent error formula will let us know how seriously these inevitable errors influenced our results.

Percent error is difference between estimated value and the actual value in comparison to the actual value and is expressed as a percentage. In other words, the percent error is relative error multiplied by 100.

The percent error formula

Formula for percent error is:

PE = (Estimated value-Actual value|/ The Actual value) × 100

0.1% M NaCl

Amount of NaCl require to prepare 0.1M NaCl calculated:

M1= [tex]\frac{1000*x}{58.5*500}[/tex]

x= 2.95g

but stir bar consume 1ml so actual value of solution is not 500ml but it is 500-1= 499ml

so, molarity= [tex]\frac{1000*2.925}{58.5*499}[/tex]

M2= 0.1002M

%error= [(M1-M2)/M1]*100

          =0.2%

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The three processes that change one rock to another are crystallization, metamorphism, and erosion and sedimentation.

The three main elements of the rock cycle are metamorphism, erosion, and crystallization.

Crystallization:

In the earth or on the surface, magma cools and solidifies to form igneous rocks. Crystallization occurs as the magma cools, resulting in the formation of various crystals at various temperatures. For instance, olivine crystallizes from magma at temperatures substantially greater than those at which quartz does.

Sedimentation and Erosion:

Rocks at the surface of the Earth are broken down into smaller bits through weathering. These sediments are moved from one location to another by erosion in the form of running water, ice, and gravity. The accumulating sediment must be crushed and bonded together in order to form a sedimentary rock.

Metamorphism:

A rock undergoes metamorphosis when it is subjected to intense heat and pressure inside the Earth yet does not melt. The rock's texture and mineral makeup may change as a result of metamorphism. A metamorphic rock may therefore have a new mineral composition or structure.

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Answer:

Physical changes occur when object or substances undergo a change that does not change their chemical composition

it's when the appearance of the matter changes but the kind of matter does not

Explanation:

breaking glass

boiling water

melting ice

crumpling of paper etc

Ace that homework

Answer:

Bean Plant

Explanation:

This is because a bean plant produces it's own food.

Unit conversions used for unit conversions are used to write very large numbers.

Unit conversion is the process of converting the measurement of a given amount between various units, often by multiplicative conversion factors that alter the value of the measured quantity without altering its effects. The term "conversion" describes the procedure of altering or converting a word's class without altering its form.

Even if it was solely used as a noun in the past, the term "email" is now a verb in Modern English. The measurement's unit is crucial. We can learn about a thing's property through measuring. It provides information about an object's weight or length. We can assign a number to that property using a measurement.

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Unit conversions used for unit conversions are used to write very large numbers.

Unit conversion is the process of converting the measurement of a given amount between various units, often by multiplicative conversion factors that alter the value of the measured quantity without altering its effects. The term "conversion" describes the procedure of altering or converting a word's class without altering its form.

Even if it was solely used as a noun in the past, the term "email" is now a verb in Modern English. The measurement's unit is crucial. We can learn about a thing's property through measuring. It provides information about an object's weight or length. We can assign a number to that property using a measurement.

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The empirical formula is C6H8O7.

A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms, is known as empirical formula.

This can be done by calculating molar ratio of elements using masses and molar masses of the element.

Mass of Carbon (C) in given compound is= 37.51g

Mass of Hydrogen (H) in the given compound is= 4.20g

Mass of Oxygen (O) in given compound is= 58.29g

Molar mass of C = 12.0107g

Molar mass of H = 1.00784g

Molar mass of O = 15.999g

by diving the mass of elements with their respective molar masses we get the number of moles of elements:

no. of moles of C= 37.51/12= 3.123moles

no. of moles of H= 4.20/1.00784 =4.167moles

no. of moles of O = 58.29/15.999 = 3.643moles

The Molar ratio of elements/atoms can be obtained by diving the above number of moles with the lesser number of moles in the above three,

C= 3.123/3.123

H= 4.167/3.123

O= 3.653/3.123

By multiplying each ratio with '6' we get the whole number.

C= 1*6

H= 1.334*6

O= 1.166*6

The empirical formula is= C6H8O7.

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The empirical formula is [tex]C_{6} H_{8} O_{7}[/tex].

The relative atomic ratios in a compound are given by an empirical formula.

The chemical formula of a compound that gives the proportions (ratios) of the elements present in the complex but not the precise number or arrangement of atoms is known as an empirical formula.

This would be the compound's element-to-whole number ratio with the lowest value.

The ratios also hold true at the molar level.

Eg: The chemical structure of glucose is C6H12O6. Every mole of carbon and oxygen is accompanied by two moles of hydrogen. Glucose has the empirical formula CH2O.

Ribose has the chemical formula C5H10O5, which can be simplified to the empirical formula CH2O.

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The answer would be the pH of the gastric juice sample is 5.1

In chemistry, pH, historically denoting "eventuality of hydrogen", is a scale used to specify the acidity or stipulation of an waterless result. Acidic results are measured to have lower pH values than introductory or alkaline results.

pH is defined as the negative log base 10 of the hydronium ion.

Formula : - log ([H⁺])

Now,

Volume of KOH, V1 = 17.2mL

Volume of HCI, V2 = 20mL

Molarity of KOH, M1 = 1.72 × 10⁻⁴ × M

The given titration is between KOH and gastric juice (HCI).

The molarity of HCI can be calculated using the relation,

M1 × V1 =M2 × V2 ---------- (1)

M2 = M1 × V1 / V2

Where, M1 is the molarity of KOH.

M2 is the molarity of HCI.

V1 is the volume of KOH.

V2 is the volume of HCI.

Substituting the values in equation (1),

M2 = 1.72 × 10⁻⁴ × 17.2 / 20.00

M2 = 1.49 × 10⁻⁵ g

The pH of gastric juice (HCI) can be calculated using the equation,

pH = -log[H⁺ ] -------- (II)

Since, HCI is a strong acid, it dissociates as follows, HCI H+CI

Therefore,

[HCl]=[H⁺]=[Cl⁻ ]= 1.49 * 10⁻⁵ * M

Substituting this in equation (II),

pH =-log[H⁺] = - log[1.49 × 10⁻⁵] = - log(1.49) + 5 × log(10)

The value of pH is calculated as,

pH = - log(4.78) + 5 × log(10) = -0.17314 +5 = 5.1

Hence, pH of gastric juice is 5.1

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The correct answer choice about the function of a nerve cell is: They send and receive electrical impulses.

The correct answer choice from the above is option b.

Nerve cells or neurons are are bundle of fibers which are connected through out the nervous system which helps detecting, recieving and sending information in informed.

The nerve cell are also known neurons are like electrical wires which runs throughout the body system in sending and receiving information.

So therefore, the correct answer choice about the function of a nerve cell is: They send and receive electrical impulses

Complete question:

Which of the following is a function of a nerve cell?

a. They released hormones

b. They send and receive electrical impulses

c. They are concerned with osmoregulation

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Thomson suggested that an atom's model resembling a plum pudding,

According to Thomson, an atom consists of a positively charged sphere with embedded negatively charged electrons. and an atom is electrically neutral because the positive and negative charges within it are of equal magnitude.

J.J. Thomson used a Crookes, or cathode ray, tube to conduct experiments that led to the discovery of the electron in 1897. He provided evidence that cathode rays have a negative charge. He also investigated positively charged neon gas particles. Thomson discovered that positively or negatively charged particles were not included in the conventional atomic model. As a result, he suggested a plum pudding-like model of the atom. The raisins in the dessert were the negative electrons, and the positive charge was in the dough.

The positive charges in the atom were not recognized as particles by Thomson's model of the atom, despite the fact that it did explain some of the electrical characteristics of the atom due to the electrons.

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Answer:

It can be chemically separated if it is a compound. The gas carbon dioxide is a pure substance.

Explanation:

Carbon dioxide is a pure substance because it has a fixed composition no matter where it was taken. Each molecule of carbon dioxide will always have 1 carbon and 2 oxygens.

The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay.

Only the conjoining Missouri is longer than the second-longest river in the US, the Mississippi, which also supports a $12.6 billion shipping sector and 35,300 employment nationwide. It is one of the largest waterways in the world, transporting goods and food for the entire planet.

Water is a valuable resource that is used in a wide variety of ways because of its unique properties. Water is essential to all life for survival. Without fresh water, people cannot endure for longer than five to seven days.

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According to the graph, increasing the temperature of the solution will increase the solubility of KBr.

There is direct relationship between solubility and temperature because if one increases the other decreases whereas if one decreases the other is also decreases. The higher temperature of the solution is, the easier a solid will be able to dissolve in that solution while on the other hand, the lower is the temperature of the solution, the solid will not dissolve easily. In the graph, we can see that the line of KBr moves in the upward direction which clearly shows that with increasing temperature, the solubility of KBr is also increases.

So we can conclude that According to the graph, increasing the temperature of the solution will increase the solubility of KBr.

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The rocks that make up the crust are relatively cold and composed of igneous, metamorphic, and sedimentary rocks.

The outermost layer of a terrestrial planet is referred to as its "crust." All known life in the universe is contained in the thin, 40 km (25 mi) deep crust of our planet, which makes up just 1% of the planet's mass.

The crust, mantle, and core are the three layers that make up the earth. Minerals and solid rocks make up the crust. The mantle, which lies below the crust, is composed primarily of solid rocks and minerals with some malleable regions of semi-solid magma. There is a hot, dense metal core at the center of the Earth.

Rocks from igneous, metamorphic, and sedimentary types make up the crust of the Earth. Igneous rocks, which are created when magma cools, are the most prevalent types of rocks in the crust. Igneous rocks such as granite and basalt are abundant in the crust of the Earth.

Hence, the rocks that make up the crust are relatively cold and composed of igneous, metamorphic, and sedimentary rocks.

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a monolayer containing 3.18×10-6 g of oleic acid has an area of 20.0 cm2. the density of oleic acid is 0.895 g / ml 1.78×10-7 cm is the thickness of the monolayer

Here given data is monolayer containing 3.18×10-6 g of oleic acid has an area of 20.0 cm2 and the given density of oleic acid is 0.895 g / ml and we have to find thickness of the monolayer=?

So from the information provided we have to calculate volume of monolayer hence, the thickness

Therefore volume=area × height

So given density = mass/volume

0.895 g / ml=3.18×10-6 g × x ml

X ml = 3.18×10-6 g / 0.895 g / ml = 0.35×10⁻⁵cm2

Volume of monolayer, volume = area × thickness so thickness = volume/area

0.35×10⁻⁵cm2 / 20.0 cm2 = 1.78×10-7 cm

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Answer:

discuss product service process position and paradigm innovation provide practical examples for echa

A 30 kg dog runs at a speed of 15 m/s.

What is the dog’s kinetic energy?

Answer: 3,400 J

1 1 dimethyl cyclohexane condensed structure is C₈H₁₆.

A condensed structural formula is a gadget for writing natural systems in a line of text. It shows all atoms, however, omits the vertical bonds and most or all the horizontal unmarried bonds. The condensed structural formulas of ethane, propane, and ethanol are. CH₃CH₃, CH₃CH₂CH₃, and CH₃CH₂OH. A molecular formula tells best the numbers of atoms of every detail in a molecule of the compound.

The molecular system lists the structure and kind of atoms but offers no indication of the bonds between them. The condensed system is CH₃(CH₂)4CH₃. although less commonly used, the condensed formula of hexane may also be written as CH₃CH₂CH₂CH₂CH₂CH₃. The chemical and molecular system for cyclohexane is C6H12. The condensed structural formula for a compound indicates the carbon atoms adjacent to their attached hydrogen atoms. For cyclohexane, the condensed structural chemical formula is CH₂CH₂CH₂CH₂CH₂CH₂.

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Red and blue are spinner equally on land.

The probability that a spinner will land on a different color:

[tex]p=\frac{total number favorable outcome}{total number of outcomes}[/tex] = [tex]\frac{total number favorable outcomes}{12}[/tex]

Probability of getting the spinner landing on red = [tex]\frac{3}{12} = \frac{1}{4}[/tex]

Probability of getting the spinner landing on green = [tex]\frac{4}{12} = \frac{1}{3}[/tex]

Probability of getting the spinner landing on blue = [tex]\frac{3}{12} = \frac{1}{4}[/tex]

Probability of getting the spinner landing on yellow = [tex]\frac{2}{12} = \frac{1}{6}[/tex]

Red and blue colors both have the same probability which means

that the chances of the spinner to land on red and blue colors are

equal.

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On red and blue, the spinner will land.

Mathematics' field of probability deals with numerical assessments of how likely an event is to occur.

p = Total no of favorable outcomes/ Total number of outcomes.

Probability of getting the spinner landing on red = 3/12 = 1/4

Probability of getting the spinner landing on green = 4/12 = 1/3

Probability of getting the spinner landing on blue = 3/12 = 1/4

Probability of getting the spinner landing on yellow = 2/12 = 1/6

Blue and red have the same probability, so this indicates

that the spinner's chances of landing on the hues red and blue are

equal.

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This substance's state of matter is most likely Solid.

How can one tell if it is a good conductor of electricity or not?

The ability of the electricity to move the electrons through a material determines its conductivity; the more free electrons a metal has, the better it conducts electricity. Most good conductors are metals, and almost all the metals are solid.

If it is made up of electrons, protons, and neurons, the state of matter in this substance is most likely to be solid.

The substance's distinctive shape, which is a distinguishing characteristic of solids, was observed when it was tested in the lab. They are also excellent conductors of electricity. The common element found in every state of matter, electrons, protons, and neutrons, are present in solids. This entire information demonstrates its solidity.

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Ka of formic acid is 1.8·10⁻⁴ M.

Chemical dissociation of formic acid in the water:

HCOOH(aq) ⇄ HCOO⁻(aq) + H⁺(aq).

K = [HCOO⁻] · [H⁺] / [HCOOH].

equilibrium concentration of [HCOOH] = 0.2 M,

equilibrium concentration of [H⁺] = 0.0.6 M,

equilibrium concentration of [HCOO⁻] = 0.006 M

K = (0.006 M)² / 0.2 M.

K = 0.00018 M.

K = 1.8·10⁻⁴ M.

When one molecule splits into two smaller ones, a dissociation reaction takes place, which results in a loss of energy. Decomposition reactions, which are also known as dissociation reactions, are those in which a large molecule is broken down into smaller products.

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Answer: Convection

Explanation: When you add hot water to a cold water, the cold water warms up because of convection. Convection refers to the invasion of warmer or hotter water to the cold water. The process relates to the situation where the cooler water sinks and the warmer water rises.

Answer:

b. convection

Explanation:

Fire. It's all fun and games until someone ignores the Bunsen burner! ...

Heat Burns. Handling hot items hastily without the proper tools can result in serious burns. ...

Chemical Burns. ...

Cuts and Scrapes. ...

Contamination. ...

Inhalation. ...

Spills and Breaks.

Answer:

phosphorus (P)

Explanation:

this is because when we add

2+2+6+2+3

we get 15

15 is also the atomic number so when we check the periodic table, we know phosphorus has an atomic number of 15 therefore the answer is phosphorus.  

Answer:

(a) Waterborne diseases are caused by pathogens that are typically spread through contaminated water. Some examples include cholera, typhoid fever, and dysentery.

(b) Communicable diseases are caused by pathogens that can be spread from one person to another. Some examples include influenza, tuberculosis, and SARS.

The cause of influenza is a virus that spreads through direct contact with respiratory secretions or droplets from an infected person. The cause of tuberculosis is a bacterium that spreads through the air and is inhaled by another person. The cause of SARS is a virus that spreads through contact with respiratory secretions or direct contact with an infected animal.

Further explanation of key concepts for aforementioned waterborne diseases:

What is Cholera?

Cholera is an infection of the small intestine that is caused by the bacterium Vibrio cholerae. Cholera is typically spread through contaminated water or food, and can cause severe diarrhea and dehydration. In severe cases, cholera can be fatal. Treatment for cholera typically involves rehydration with fluids and electrolytes.

What is Typhoid Fever?

Typhoid fever is a potentially deadly bacterial infection that is most commonly spread through contaminated food or water. Symptoms of typhoid fever include fever, diarrhea, and abdominal pain. In severe cases, typhoid fever can lead to death. Treatment for typhoid fever typically involves antibiotics.

What is Dysentery?

Dysentery is a bacterial infection of the intestines that is typically spread through contaminated water or food. Symptoms of dysentery include severe diarrhea, abdominal pain, and blood in the stool. In severe cases, dysentery can be fatal. Treatment for dysentery typically involves antibiotics.

If the density of nickel is 8.9 g/cm3, it occupies 0.15 cubic decimeters in 1335 grams of nickel.

Density is defined as the mass of a unit volume of a material substance, the space occupied by the unit mass of a material. It is the degree of compactness measured by the quantity of mass per unit  volume.

density = mass/ volume

volume = mass/ density

here the given mass is = 1335 grams

and the density given is = 8.9

=1335/8.9

=150

therefore volume calculated is 150 cubic centimeter

1 cubic centimeter is equal to 0.001 cubic decimeter

150 cubic centimeter is equal to 0.15 cubic decimeter

If the density of nickel is 8.9 g/cm3, it occupies 0.15 cubic decimeters in 1335 grams of nickel.

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Yes, the aluminium foil is impure and contains a mixture of substances that affects the percentage yield as the impurities in it are added to the total weight of the end product.

In homes and commercial sectors, aluminium foil has many uses. It is used for storing food, baking cookies and cakes, and also as food wrappers.

People also use aluminium foil to store delicate food items such as meat and vegetables.

According to research, aluminium foil is not a pure substance as some of its particles leaches into food thus posing serious health problems.

This foil contains microparticles of iron, zinc, gallium and silicon. Moreover, the colouring and paint on it cause harmful impacts when it is exposed to heating.

Furthermore, it also affects the percentage yield by increasing the total weight of the end product.

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An atom has 8 protons, 9 neutrons, and 8 electrons then atomic number will be 8.

Proton can be defined as the particle which present in nucleus. it has positive charge.

Atomic number can be determined by the count of proton which occur in a particular atom.

It can be written as:

Number of proton = atomic number

8       = atomic number.

It is mentioned that the count of proton is 8 hence, the atomic number will be 8.

By adding count of protons and count of neutron, atomic mass can be calculated.

Therefore, atomic number will be 8.

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