A balloon was inflated to 3.0 L at 295 K . The balloon was left in a hot car and heated to 333 K.

The final volume of the balloon was ? L which means that the size of the balloon?

Answer:

3.0059572661984113e-24

Explanation:

An error can be defined as a deviation from the correct value of a given measurement.

The percent error is 8.7%

The formula for percent error is given as:

Percent error = |Measured  value – Exact Value|/Exact value * 100.

From the above:

Measured value = 25 ml

Exact Value = 23 ml

Hence:

Percent Error = | 25ml - 23 ml | / 23 ml * 100

Percent Error = 2/23 * 100

Percent Error =  8.7%

Therefore the percent error is 8.7%

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Answer:

we know that it was the vinegar and baking soda because gas had been created, the gas was held within the bubbles. the gas that was created was called Carbon Dioxide or CO2

The pH of the final product is 7.

The quantity of hydrogen and hydroxyl ions in a solution determines pH. The negative logarithm of the hydrogen ion concentration is another name for pH.

A solution's pH defines how basic and how acidic it is. It establishes how many protons have been released or given. We have the situation as it stands.

0.20 molar HCL after titrating 0.056 molar koh.

20 ml of the solution yield a pH of 7.

Consequently, the given solution's pH value is 7.

Titration is employed in quantitative tests to keep the solution's concentration constant. The balancing of volume and concentration can be distinguished by a subtle shift in color.

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The pH of a solution that has a concentration of \(2.78 * 10^{-3}\)M is 2.56. The aqueous solution is acidic because it is less than 7 on the pH scale.

pH is a figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.

The pH is equal to −log {H}

According to this question, \(2.78 * 10^{-3}\) of hydrogen bromide is given. The pH can be estimated as follows:

pH = \(- log\) {\(2.78 * 10^{-3}\)}

pH = 2.56 (acidic)

The complete question is as follows:

What is the hydronium ion concentration for an aqueous solution with a hydroxide ion concentration of 2.78x10^-10 M? Is the solution acidic basic or neutral?

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Answer:

Explanation: The answer is A. logging

Niels Bohr and Rutherford model of an atom are best to understand the quantum chemistry.

Niels Bohr explains about the particle behavior of an atom and gives account about the energy level or shells of an atom and hydrogen spectrum too.

Rutherford discovers the nucleus of an atom and identified that the mass of an atom is focused at the center oof an atom and proton is positively charged.

Therefore, Niels Bohr and Rutherford model of an atom are best to understand the quantum chemistry.

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Answer: Which of these properties is the best one to use for the identification of an element?

The number of protons in the atomic nucleus

Explanation:

Got it right on edge 2020

Answer:

\(\boxed {\boxed {\sf M \approx0.864 \ M \ HBr}}\)

Explanation:

The molarity of a solution is the moles per liter. It is found using this formula:

\(M=\frac { moles \ of \ solute}{liters \ of \ solution}\)

First we must calculate moles, since we are given grams. To convert from grams to moles, the molar mass is used. This is also given to us, it is 80.91 grams per mole. We can use it as a ratio.

\(\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}\)

Multiply by the given number of grams.

\(314.5 \ g \ HBr *\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}\)

Flip the fraction so the grams of HBr cancel.

\(314.5 \ g \ HBr *\frac {1 \ mol \ HBr}{80.91 \ g \ HBr}\)

\(\frac {314.5 \ mol \ HBr}{80.91 }=3.88703497714 \ mol \ HBr\)

Now we know the moles, and can calculate the molarity.

There are 3.88703497714 moles of solute and 4.50 Liters of solution.

\(M= \frac {3.88703497714 \ mol }{ 4.50 \ L}\)

\(M= 0.863785550476 \ mol/ L\)

The original measurements have 4 and 3 significant figures, so we use the lowest number of 3 for our answer. For the number we calculated, that is the thousandth place.

The 7 in the ten thousandth place tells us to round the 3 to a 4.

\(M \approx 0.864 \ mol/ L\)

\(M \approx 0.864 \ M \ HBr\)

The molarity of the solution is about 0.864 M HBr.

Answer:

I'm taking a guess here. Aluminum.

Explanation:

The best conductor of heat would be the material that melted the ice fast. A.K.A. the one with the least amount of minutes. Since aluminum has the least, it is the best conductor of heat

therefore the correct option is d) 4.1×10⁻³.

Given that the initial concentration of HZ is 5.0 moles and at equilibrium, 8.7% of the acid has become hydronium.

The concentration of HZ that has not reacted is (100% - 8.7%) = 91.3%.

The final concentration of HZ is 5.0 × 0.913 = 4.565 moles.

The final concentration of the hydronium ion is 5.0 × 0.087 = 0.435 M.HZ ⇌ H+ + Z-Ka

= [H+][Z]/[HZ]Ka

= [H+][Z]/[HZ]

= [0.435]² / 4.565

= 0.041

Which is the same as 4.1 × 10-3.

We know that HZ is an acid that will partially ionize in water to give H+ and Z-.

The chemical equation for this reaction can be written as HZ ⇌ H+ + Z-.

The acid dissociation constant (Ka) of HZ is the equilibrium constant for the reaction in which HZ ionizes to form H+ and Z-.Thus, Ka = [H+][Z]/[HZ].

The given problem is a typical example of the dissociation of a weak acid in water. We are given the initial concentration of HZ and the concentration of hydronium ions at equilibrium.

To find the equilibrium concentration of HZ, we can use the fact that the total amount of acid is conserved.

At equilibrium, 8.7% of HZ has dissociated to give hydronium ions.

This means that 91.3% of the original HZ remains unreacted.

Therefore, the concentration of HZ at equilibrium is 5.0 × 0.913 = 4.565 M.

The concentration of hydronium ions at equilibrium is 5.0 × 0.087 = 0.435 M.

Using the equation Ka = [H+][Z]/[HZ], we can substitute the values of the concentrations and the equilibrium constant into the equation and solve for Ka.

Ka = [H+][Z]/[HZ]

= [0.435]² / 4.565

= 0.041 or 4.1 × 10-3.

The answer is d) 4.1 × 10-3.

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Answer:

Ag

Explanation:

atomic 33 because it what what sence

The given statement "Carbon in the ocean originates from the atmosphere" is true because Carbon is one of the most vital elements on Earth and is involved in various biogeochemical cycles, including the carbon cycle.

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The correct question would be as

Carbon in the ocean originates from the atmosphere. Please select the best answer from the choices provided. True or False

Answer:

1.KCl is answer

Explanation:

when potassium chloride KCl is dissolved in water,it will dissociate to form k+ and cl- .thus,the solute must be k+Cl- .

I hope it's helpful!

The substance dissolved in a solvent or water is called a solute it makes up the homogenous mixture called solution by getting dissolved in it.

The \(\rm KCl\) is the solute in the aqueous solution of \(\rm KCl\).

Therefore, option A, \(\rm KCl\) is the solute.

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The percent yield of the reaction is 82%

First step: make the chemist equation.

2 Al (s) + Fe2O3 (s) → 2 Fe (s) + Al2O3 (s)

As the statement says that aluminium is in excess, the limiting reactant is the Fe₂O₃.

Second step: Find out the moles in the reactant.

Molar weight Fe2O3: 159.7 g/m

Mass / Molar weight = moles

50 g /159.7 g/m = 0.313 moles

Third step: Analyse the reaction. 1 mol of Fe2O3 makes 2 moles of Fe.

1 mol Fe2O3 ____ 2Fe

0.313 mol Fe2O3 ____ 0.626 moles

Molar weight Fe = 55.85 g/m

Moles . molar weight = mass

55.85g/m . 0.626m = 34.9 grams

This will be the 100% yield of the reaction but we only made 22.6 g

34.9 g ____ 100%

22.6 g ____ 64.75 %

Hence, the percent yield is 64.75 %.

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Answer:

In the backrest use materials where it is easy to clean and where they do not absorb fluids, in this way it would be cooler, such as an ecological leather simulator.

And in the armrest as well, but in both areas we must not rule out that if or if it should have even a minimum of padded surface so that the patient or the person who spends most of the day in the wheelchair does not suffer from joint pain.

Explanation:

Some wheelchair factories also implement modern chairs where they are made of stainless steel structures lined with padded material with perforated fabrics that allow breathing and aeration of body areas that have contact with the fabric.

When antacid reacts with HCl to produce H2CO3 it produce fizzy gas react due to a double displacement reaction.

Table salt and carbonic acid are produced in a two fold displacement process when hydrochloric acid and antacid are combined. Additionally, due to the instability of carbonic acid, it will decompose into water and carbon dioxide, emitting a "fizzy" gas.

Strong acid hydrochloric acid is denoted by the chemical formula HCl. The primary ingredient in antacids is sodium bicarbonate, sometimes known as baking soda and has the chemical formula NaHCO3.

Antacid undergoes a chemical reaction when it reacts as a carbonate with powerful acids like hydrochloric acid to create compounds with a different chemical makeup from the beginning components. Similar reactions will be produced by other carbonates, such as calcium carbonate, which makes up the majority of Tums.

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Plants use carbon to build leaves and stems, which are then digested and used for cellular growth by animals. Carbon is stored in the atmosphere as gases such as carbon dioxide. It is also stored in the oceans, where it is captured by a variety of marine organisms.

A heterotroph is an organism that, unlike an autotroph, cannot fix carbon and instead grows on organic carbon.

Carbon dioxide is pulled from the air by photosynthesis to produce carbon-based food for plant growth. Carbon is transferred from plants to animals.

Carbon from plants moves through food chains to the animals that eat them. Animals that eat other animals absorb carbon from their food as well.

Thus, Organic molecules produced by photosynthesizes are consumed by food chains, and cellular respiration converts the organic carbon back into carbon dioxide gas.

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Answer:

catalpa

Explanation:

i took the test

The empirical formula of compound is B₄ClH₉  and its molecular formula is B₄ClH₉ .

The simplest whole number ratio of atoms from each element in the compound makes up the empirical formula for that compound.

Finding the molar mass of each of the component:

where,

,B=10.811, Cl=35.453, H=1.00794

Converting it to moles: B=4.5564702617704, Cl=1.1389727244521, H=10.278389586682

Finding the smallest mole value: 1.1389727244521

Dividing all  the components by the smallest value:

B=4.0005086723761, Cl=1, H=9.0242631504861

Rounding off to the closest whole numbers: B=4, Cl=1, H=9

Now combining it to get the empirical formula: B₄ClH₉

Here we know that,

n= Molecular formula/ Empirical formula

since n=1

So, Molecular formula = Empirical formula

Molecular formula=  B₄ClH₉

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The correct answer is To determine how many grams of hydrobromic acid (HBr) are produced when excess nitric acid\((HNO3)\)reacts with 25.4 g of lithium bromide\((LiBr)\), we need to use stoichiometry and the balanced chemical equation provided.

The balanced chemical equation is \(HNO3(aq) + LiBr(aq) → LiNO3(aq) + HBr(aq)\)From the equation, we can see that one mole of HNO3 reacts with one mole of LiBr to produce one mole of HBr. Therefore, we need to first determine the number of moles of LiBr used in the reaction. To do this, we can use the molar mass of LiBr to convert the given mass of 25.4 g to moles: \(25.4 g LiBr x (1 mole LiBr / 86.85 g LiBr) = 0.292 moles LiBr\)Since the reaction uses 1 mole of LiBr, we know that 0.292 moles of HBr will be produced. To determine the mass of HBr produced, we can use the molar mass of HBr: \(0.292 moles HBr x (80.91 g HBr / 1 mole HBr) = 23.6 g HBr\) Therefore, when excess nitric acid reacts with 25.4 g of lithium bromide, 23.6 g of hydrobromic acid are produced. It's important to note that the word "excess" indicates that there is more than enough nitric acid to react with all of the lithium bromide, which means that the reaction will go to completion and all of the LiBr will be consumed. If the nitric acid were limiting, then we would need to calculate the amount of HBr produced based on the limiting reactant.

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Since we are given pressure and volume, this tells us that we will be using Boyle's Law.

1) List what you have and what you need.

P₁ = 101.3 kPa

V₁ = 20.0 L

P₂ = 88.4 kPa

V₂ = ?

2) Rearrange your formula and input your values.

\(P_{1}V_{1}=P_{2}V_{2}\\ V_{2}=\frac{P_{1}V_{1}}{P_{2}} \\ V_{2}=\frac{(101.3 kPa)(20.0L)}{(88.4kPa)} \\ V_{2}=22.91855204\\ \)

V₂ = 22.9 L

There really isn't much to explain. All you need to do is use the formula and rearrange it so that the variable that you want is isolated and then plug those numbers in the calculator and you have your answer.

To kinda make sure you're doing this right, using the relationship between variables will help you out. You should know that pressure and volume has an inverse relationship so when pressure goes down, you should expect your volume to go up and vice versa. This is the case since the pressure decreased from 101.3 kPa to 88.4 kPa so it makes that the volume will increase.

Answer:

There are three types of periods in the modern periodic table: very short periods, short periods, and long periods.

The difference between very short periods and short periods is the number of elements they contain. Very short periods only contain two elements, while short periods contain eight elements. The difference between short periods and long periods is the number of orbitals that can be occupied by electrons in each period. Short periods can only have electrons in the s- and p-orbitals, while long periods can also have electrons in the d-orbital.

Here is a table summarizing the differences between very short periods, short periods, and long periods:

Answer: Its B,C,D, and E

Explanation:

The correct statements about the compound calcium chloride are Chlorine becomes a negative ion, The chemical formula is CaCl₂, Calcium transfers electrons to the chlorine atoms and The subscript 2 is used to balance the charge.

Hence, Option B, C, D and E are correct.

Calcium chloride is a crystalline white substance which is soluble in water. It is the chloride salt of calcium. The chemical formula of calcium chloride is CaCl₂. In calcium chloride, Calcium atom has two valence electrons.

Now lets check all statements one by one

Option (A): Calcium chloride is a ionic compound. Here calcium transfers its valence electrons to both chlorine atoms.

So, statement A is incorrect.

Option (B): In calcium chloride each chlorine atom gains 1 electron and we get a negatively charged ion Cl⁻.  

So, statement B is correct.

Option (C): In Calcium chloride the valency of calcium is +2 and the valency of chlorine is -1.  So the chemical formula is CaCl₂.

So, statement C is correct.

Option (D): In calcium chloride calcium transfer its two valence electrons to both the chlorine atoms.

So, statement D is correct.

Option (E): In calcium chloride the subscript 2 is used to balance the charge. The subscript show the number of atoms in compound.  

So, statement E is correct.

Thus, from the above conclusions we can say that The correct statements about the compound calcium chloride are Chlorine becomes a negative ion, The chemical formula is CaCl₂, Calcium transfers electrons to the chlorine atoms and The subscript 2 is used to balance the charge.

Hence, Option B, C, D and E are correct.

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The balanced chemical equation for the reaction between sodium and oxygen to form sodium oxide is: 4Na + O2 → 2Na2O According to the balanced equation, 4 moles of sodium react with 1 mole of oxygen to produce 2 moles of sodium oxide.

Therefore, the stoichiometric ratio is 4:1:2 (sodium:oxygen:sodium oxide). If you have 8 moles of sodium, you can use the stoichiometry to determine the amount of sodium oxide produced. Since the ratio of sodium to sodium oxide is 4:2, you would expect to produce half the number of moles of sodium oxide compared to the moles of sodium. Therefore, with 8 moles of sodium, you would expect to produce 4 moles of sodium oxide.

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Answer:

there are used to where large volumes are needed to be transferred and coloured graduated marks make it easier to measure the volumes. the disadvantage isthat they are not so precise and there are greater changes of human error

Pyruvate undergoes fermentation, which transforms it into lactic acid inside the absence of oxygen.

The breakdown of the drug occurs throughout this process. similar to how pyruvate is converted into lactic acid.

An organic acid contains lactic acid. Its chemical formula is CH 3CH(OH)COOH.

It serves as a synthesis precursor inside a number of biochemical as well as molecular synthesis industries.

The final result of the glycolysis pathway, pyruvate, is transformed into lactic acid inside the lack of oxygen.

Glycolysis

The process through which glucose gets broken down to provide energy is known as glycolysis.

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Answer:

1) 60°

2) 60°

3) 45°

4) E

5)90°

6) E

When the tree species was preserved as a fossil in the Arizona desert, the environment was likely different compared to the present. Based on the fact that the tree species is now extinct, infer that the conditions that supported its existence have significantly changed.

In the past, the environment where the tree lived may have had different climatic conditions, such as temperature, precipitation patterns, and humidity levels. It may have been part of a specific ecosystem or habitat that provided suitable resources for the tree's growth and survival. The tree species may have had adaptations that allowed it to thrive in that particular environment.

The extinction of the tree species may have had cascading effects on other living things that were associated with it. For example, other plant species that relied on the tree for shade or as a host for epiphytic growth might have also suffered or disappeared. Similarly, animals that depended on the tree for food, shelter, or nesting sites could have been affected by its extinction.

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Answer:6.02

Explanation:

Answer:

there are about 6 atoms in hydrogen