OK HURRY AND PLEASE ANSWER COZ THIS TEST IS TIMED BROS

What is the sum of the coefficients in the balanced chemical equation for the combustion of acetone, C3H6O(l), in air?
Express answer as an integer

2-chloro-3-methyl-2-butene exhibits three different ¹H NMR signals.

To determine the number of ¹H NMR signals exhibited by 2-chloro-3-methyl-2-butene, we need to analyze the different types of hydrogen (proton) environments in the molecule.

The structure of 2-chloro-3-methyl-2-butene can be represented as follows:

CH3-CH(Cl)-C(CH3)=CH2

Let's examine the different proton environments:

The methyl group (CH3) adjacent to the chlorine atom is chemically equivalent to the other methyl group attached to the double bond. These two methyl groups are part of the same functional group and should produce only one NMR signal. Therefore, we have one signal for these protons.

The hydrogen attached to the carbon adjacent to the chlorine atom is different from the other hydrogens in the molecule. This hydrogen is allylic to the double bond and exhibits different chemical shifts due to its proximity to the pi electrons. Thus, we have a separate signal for this hydrogen.

The hydrogens on the carbon atoms in the double bond are also chemically different from the rest of the hydrogens in the molecule. However, they are part of the same functional group and should produce only one NMR signal.

Taking all these proton environments into account, 2-chloro-3-methyl-2-butene exhibits a total of three ¹H NMR signals.

For more such question on signals. visit :

https://brainly.com/question/30583972

#SPJ8

The claim that vinyl gloves have a higher leak rate than latex gloves is supported by the study at a significance level of 0.005.

To determine if vinyl gloves have a higher leak rate than latex gloves, we can conduct a hypothesis test.

The z-value is calculated as:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions, and n₁ and n₂ are the sample sizes.

Certainly! Let's calculate the z-value to determine if vinyl gloves have a higher leak rate than latex gloves.

For vinyl gloves:

Sample size (n₁) = 240

Leaking gloves (x₁) = 0.63 * 240 = 151.2 (approximated to 151)

For latex gloves:

Sample size (n₂) = 240

Leaking gloves (x₂) = 0.07 * 240 = 16.8 (approximated to 17)

We will calculate the z-value using the formula:

z = (p₁ - p₂) / √((p₁(1 - p₁) / n₁) + (p₂(1 - p₂) / n₂))

where p₁ and p₂ are the sample proportions.

p₁ = x₁ / n₁ = 151 / 240 ≈ 0.629

p₂ = x₂ / n₂ = 17 / 240 ≈ 0.071

Calculating the z-value:

z = (0.629 - 0.071) / √((0.629 * (1 - 0.629) / 240) + (0.071 * (1 - 0.071) / 240))

z ≈ 13.239

The calculated z-value is approximately 13.239. To determine if the claim is supported, we compare this value to the critical z-value for a one-tailed test at a significance level of 0.005.

learn more about significance level Here:

https://brainly.com/question/30766149

#SPJ4

To determine the approximate pH of buffer 1, we can use the Henderson-Hasselbalch equation, which is a mathematical expression that relates the pH of a buffer solution to the pKa and the ratio of the concentrations of the conjugate base and the weak acid.                                                                                                                                                                    

The equation is pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the weak acid. By plugging in the relevant values for buffer 1, we can calculate an approximate pH. However, it's important to note that this equation is only an approximation and assumes certain conditions are met.
This formula helps calculate the pH of a buffer solution, enabling you to estimate the pH of buffer 1 based on its components.

Learn more about Henderson-Hasselbalch equation here:
https://brainly.com/question/31732200

#SPJ11

Answer:

(CPI) Consumer Price Index

Explanation:

A consumer price index measures changes in the price level of a weighted average market basket of consumer goods and services purchased by households. A CPI is a statistical estimate constructed using the prices of a sample of representative items whose prices are collected periodically.

SiO2 is the chemical name for silicon dioxide. One silicon atom and two oxygen atoms make up the compound. One of the most prevalent minerals in the Earth's crust, it is also known as silica or quartz.

One silicon atom and two oxygen atoms combine to form silicon dioxide, often known as silica or quartz. It is one of the most common minerals in the crust of the Earth, accounting for around 59% of the crust's weight. Due to its distinct physical and chemical characteristics, including as its hardness, high melting point, and resistance to chemical reactions, it has a wide range of uses. It is employed in a number of sectors, including the manufacture of glass, ceramics, and electronics. It is a crucial part of many living species and may be found in many natural materials including sand, rocks, and soil. Nevertheless, continuous exposure to tiny silicon dioxide particles might result in respiratory issues such

Learn more about silicon dioxide here:

https://brainly.com/question/15412188

#SPJ4

Explanation:

The Answer is a reaction between two acids

Answer: The constant is the one that is always the same, which would be the sunlight, soil, species and amount of water. The control is the plant with no fertilizer.

The two substances can never be separated by distillation because distillation depends on difference in boiling point.

Distillation is a separation method that depends on difference in boiling point between two substances.

Usually, the substance having a lower boiling point is collected first as the temperature is gradually raised. The substance having a higher boiling point then follows.

However, since the two substances have the same boiling point, they can not be separated by distillation because they will be converted to vapor simultaneously thereby making separation impossible.

Learn more: https://brainly.com/question/15946045

Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

To know more about temperature  visit:

https://brainly.com/question/7510619

#SPJ11

Answer:

flourine 19F-

Explanation:

because we have 1 extra electron so the charge should be negative, then check the number of protons to know the atomic number, and 9 is flourine

Since the exact values of the service times are not provided, it is not possible to calculate the 3-sigma control limits. Therefore, the correct answer is "None of the other options."

The 3-sigma control limits are used in statistical process control to determine the acceptable range of variation in a process. To calculate the 3-sigma control limits, we need to first find the mean and standard deviation of the service times for the 20 randomly selected customers.

Step 1: Find the mean (average) of the service times.
Add up all the service times and divide by the total number of customers (20).

Step 2: Find the standard deviation of the service times.
Calculate the difference between each service time and the mean, square each difference, sum up all the squared differences, divide by the total number of customers (20), and then take the square root of the result.

Step 3: Calculate the 3-sigma control limits.
Multiply the standard deviation by 3 and add/subtract the result to/from the mean. This will give you the upper and lower control limits.

Since the exact values of the service times are not provided, it is not possible to calculate the 3-sigma control limits. Therefore, the correct answer is "None of the other options."

Learn more about 3-sigma control limits from given link: https://brainly.com/question/17063477

#SPJ11

Answer:

B,) a carboxylic acid and an amine

Explanation:

A functional group is an atom or group of atoms inside a molecule that has comparable chemical properties anytime it appears in numerous compounds. When other parts of the molecule are not similar, some functional groups react in certain manners.

Carboxylic acid is a carbonyl-containing functional group, with carbon atom bonded to an hydroxyl group on one side and on the other side is either a carbon or hydrogen atom.  

An amine group is composed of a nitrogen atom bonded to a combination of carbon and hydrogen atoms.

Answer:

a carboxylic acid and an amine

Explanation:

To produce 180 millilitres of a saline solution of the same concentration, we need 1.2 milligrams of salt.

It is given that a ratio of 0.5 milligrams of salt is present in 75 millilitres of solution. Let us assign a variable x to the amount of salt present in 180 millilitres of saline solution.

To maintain the same concentration we can use the method of cross-multiplication:

The following equation can be used to determine the value of x:

0.5 mg / 75 ml = x mg / 180 ml

( 0.5 × 180) / 75 = x mg

x mg = 90 / 75

Hence x is approximately equal to 1.2 mg.

To learn more about the saline solution:

https://brainly.com/question/29402636

Humans have a great impact on these resources

Answer:

2Al(s) + 6HCl(aq)→2AlCl3(aq) + 3H2(g)

Answer:

1.1 x 10⁴ J

Explanation:

To calculate eth energy needed, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = energy/heat (J)

-----> m = mass (g)

-----> c = specific heat (4.184 J/g°C)

-----> ΔT = change in temperature (°C)

You can plug the given values into the equation and solve.

Q = mcΔT

Q = (75.0 g)(4.184 J/g°C)(55.0 °C - 20.0 °C)

Q = (75.0 g)(4.184 J/g°C)(35.0)

Q = 11,000 J

Q = 1.1 x 10⁴ J

Answer:

\(\rm MgBr_2 \cdot 6\, H_2O\).

Explanation:

Let \(x\) denote the number of \(\rm H_{2}O\) formula units for every \(\rm MgCl_{2}\) formula unit. The formula of the hydrate would be \({\rm MgBr_2} \cdot x\, {\rm H_2O}\).

Look up the relative atomic mass of each element on a modern periodic table:

Formula mass:

\(\begin{aligned}M({\rm MgBr_{2}}) &= 24.305 + 2 \times 79.904 \\ &= 184.113\; \rm g\cdot mol^{-1}\end{aligned}\).

\(\begin{aligned}M({\rm H_{2}O}) &= 2 \times 1.008 + 15.999 \\ &= 18.015\; \rm g\cdot mol^{-1}\end{aligned}\).

The anhydrous compound would be \(\rm MgBr_{2}\). There was \(27.21\; \rm g\) of this compound. Calculate the number of moles of formula units in that much of this compound:

\(\begin{aligned}n({\rm MgBr_{2}}) &= \frac{m({\rm MgBr_{2}})}{M({\rm MgBr_{2}})} \\ &= \frac{27.21\; \rm g}{184.113\; \rm g \cdot mol^{-1}} \\ &\approx 0.1478\; \rm mol\end{aligned}\).

During heating, \(43.19\; \rm g - 27.21\; \rm g = 15.98\; \rm g\) of water \(\rm H_{2}O\) escaped from the hydrate. Calculate the number of formula units in that \(15.98\; \rm g\) of \(\rm H_{2}O\!\):

\(\begin{aligned}n({\rm H_{2}O}) &= \frac{m({\rm H_{2}O})}{M({\rm H_{2}O})} \\ &=\frac{43.19\; \rm g - 27.21\; \rm g}{18.015\; \rm g \cdot mol^{-1}} \\&= \frac{15.98\; \rm g}{18.015\; \rm g \cdot mol^{-1}} \\ &\approx 0.887\; \rm mol\end{aligned}\).

In other words, approximately \(0.1478\; \rm mol\) of \(\rm MgBr_{2}\) formula units (and hence the same number of moles of \({\rm MgBr_2} \cdot x\, {\rm H_2O}\) formula units) contain approximately \(0.887\; \rm mol\) of \(\rm H_{2}O\) formula units. Calculate the ratio between the two:

\(\begin{aligned}x &= \frac{n({\rm H_{2}O})}{n({\rm MgBr_2})} \\ &\approx \frac{0.1478\; \rm mol}{0.887\; \rm mol} \approx 6\end{aligned}\).

Hence, the formula of the hydrate would be \(\rm MgBr_2 \cdot 6\, H_2O\).

Answer:

AlCl3 + 3Na > Al + 3NaCl

Explanation:

AlCl3+Na → Al + NaCl

Al =1 Al=1

Cl =3 Cl = 1

Na=1. Na = 1

so balance

and it would be

Alcl3 + 3Na → Al + 3NaCl

R - CO - OH + NaHCO3 → R - CO-O-  Na+     +  H20 + CO2

Here Sodium bicarbonate solution is used to neutralize the excess acetic acid and the acid catalyst in the reaction mixture.

In this reaction the product sodium acetate salt is formed which can be easily removed during work up because of its complete solubility in water. The exact reaction is as follows. Baking soda or bicarbonate of soda is the popular term for sodium bicarbonate, which has the chemical formula NaHCO3 and is also known by its IUPAC designation, sodium hydrogen carbonate[9]. A sodium cation (Na+) and a bicarbonate anion (HCO3) combine to form the salt. In spite of frequently appearing as a fine powder, sodium bicarbonate is a crystalline white solid. It tastes similar to washing soda, with a mildly salty, alkaline flavor (sodium carbonate). Nahcolite is a type of naturally occurring mineral. It is a part of the mineral natron and is present in many mineral springs as a dissolved substance. Due to its long history of use and variety of names, including baking soda, bread soda, cooking soda, and bicarbonate of soda, the salt is frequently seen next to baking powder in supermarkets.

Learn more about Sodium bicarbonate here:

https://brainly.com/question/8560563

#SPJ4

Answer: A

Explanation:

5.0 g / 56 g/mol is the numerical expression that gives the number of moles in 5.0 g of CaO.

HOW TO FIND NUMBER OF MOLES:

CaO = 40g/mol + 16g/mol = 56g/mol

Number of moles = 5.0g ÷ 56g/mol

Therefore, 5.0 g / 56 g/mol is the numerical expression that gives the number of moles in 5.0 g of CaO.

Learn more: https://brainly.com/question/12513822?referrer=searchResults

The complete sentences are:

Page 3:

The effect of energy in phase transitions of matter is that it is required to break the intermolecular forces that hold the particles of a substance together. When energy is added to a substance, the particles move faster and the intermolecular forces are broken. This can cause the substance to change phase.

The interactive demonstration on the sample of water shows that energy is required to melt ice and boil water. When the ice is heated, the particles start to move faster and the ice melts. The temperature of the water stays constant at 0°C until all of the ice has melted. This is because the energy is being used to break the intermolecular forces in the ice. Once all of the ice has melted, the temperature of the water starts to rise again. When the water is boiled, the particles move so fast that they escape from the liquid state and become a gas. The temperature of the water stays constant at 100°C until all of the water has boiled. This is because the energy is being used to break the intermolecular forces in the water. Once all of the water has boiled, the temperature of the steam starts to rise again.

The complete sentences:

Page 4:

Heating curves show the temperature of a substance as it is heated. The curve has a horizontal line at the melting and boiling points, which indicates that the temperature does not change during these phase changes.

Cooling curves show the temperature of a substance as it is cooled. The curve has a horizontal line at the melting and boiling points, which indicates that the temperature does not change during these phase changes.

Both curves show that the temperature of a substance increases as it is heated and decreases as it is cooled.

A heating curve is more choppy than a cooling curve because there are more phase changes during heating than during cooling.

Find out more on matter here: https://brainly.com/question/3998772

#SPJ1

The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

To know more about Non-ferrous metals

https://brainly.com/question/33291477

#SPJ11

Answer:

a (F < C < Li)

b (Li < Na < K)

c (Ge < P < O)

d (C < N < Al)

e (Ga < Cl < Al)

Answer:

Explanation:

C₈H₆Cl₂O₃

mol weight

= 8 x 12 + 6 x 1 + 35.5 x 2 + 3 x 16

96 + 6 + 71 + 48 = 221 g

230 g = 230 / 221 mol = 1.04 M solution

pKa = 2.73

Ka = 10⁻²°⁷³

= 1.86 x 10⁻³

Let the compound be represented by KH

KH = K⁻ + H⁺

a        0       0

a - x      x        x  

x ² / (a - x)  = Ka

x² / (1.04 - x) = .00186

x is very small so 1.04 - x = 1.04

x² / 1.04 = .00186

x² = .0019344

x = .044

= 44 x 10⁻³

[ H⁺ ] = 44 x 10⁻³

pH = - log ( 44 x 10⁻³)

= 3 - log 44

= 1.35

The pH of the solution is 1.37.

Let us represent the compound 2,4-Dichlorophenoxyacetic acid using the symbol BH

The molar mass of 2,4-Dichlorophenoxyacetic acid is 221 g/mol

Mass concentration of 2,4-Dichlorophenoxyacetic acid = 230 gL−1

But;

Mass concentration = molar concentration × molar mass

Molar concentration = Mass concentration/molar mass

Molar concentration = 230 gL−1 /221 g/mol

= 1.04 M

We now have to set up an ICE table as follows;

      BH ⇄        B^-(aq)   +    H^+(aq)

I     1.04            0                  0

C    -x                +x                +x

E    1.04 - x       +x                 +x

PKa = -log Ka

Ka =Antilog(-Ka)

Ka = Antilog(- 2.73)

Ka = 1.86 × 10^-3

Ka = [ B^-] [ H^+] / [BH]

1.86 × 10^-3 = [x] [x] / [1.04 - x]

1.86 × 10^-3 = [x]^2 / [1.04 - x]

[x]^2 = 1.86 × 10^-3  [1.04 - x]

[x]^2 = 1.93 × 10^-3 - 1.86 × 10^-3x

We now have the quadratic equation;

x^2  + 1.86 × 10^-3x - 1.93 × 10^-3 = 0

x^2  + 0.00186x - 0.00193 = 0

x = 0.043 M

[H^+] = 0.043 M

pH = - log[H^+]

pH = -[0.043 M]

pH = 1.37

Learn more: https://brainly.com/question/13164491

Answer:

Explanation:0.493 M NaOH means 0.493 mol NaOH/L

mols

mols = ------ x L

L

mols = M x V

In a titration procedure, 40.57 mL of 0.493 M NaOH solution was used. How many mols NaOH did this volume of NaOH solution contain?

mols = M x V

0.493 mols NaOH

mols = ----------------------- x 0.04057 L

L

mols = 0.0200 mols NaOH

Sure, here is a brief explanation of the difference between atoms, molecules, compounds, and mixtures in chemistry:

Atoms are the smallest unit of an element that can exist. They are made up of protons, neutrons, and electrons.

Molecules are groups of two or more atoms that are chemically bonded together. The atoms in a molecule can be of the same element, like in oxygen (O2), or of different elements, like in water (H2O).

Compounds are substances that are made up of two or more elements that are chemically combined. Compounds have a fixed composition, meaning that they always contain the same elements in the same proportions.

Mixtures are substances that are made up of two or more substances that are not chemically combined. The components of a mixture can be separated by physical means, like filtration or distillation.

Here is a table that summarizes the key differences between atoms, molecules, compounds, and mixtures:

| Property | Atom | Molecule | Compound | Mixture |

|---|---|---|---|---|

| Composition | Single element | Same element or different elements | Two or more elements | Two or more substances |

| Bonding | Not bonded | Chemically bonded | Chemically bonded | Not chemically bonded |

| Separation | Not possible | Not possible | Possible | Possible |

| Properties | Same as element | Same as elements or different | Different from elements | Same or different from components |

I hope this helps! Let me know if you have any other questions.

The carbon dioxide cycle refers to the natural process of exchanging carbon dioxide between the atmosphere, oceans, and land. This cycle can help to regulate the levels of carbon dioxide in the atmosphere over long periods of time.

However, it is not able to easily correct for the increasing amounts of carbon dioxide that have been introduced into the atmosphere by industrialization for several reasons: Carbon dioxide emissions from human activities are much larger than natural carbon dioxide sources: Human activities, such as burning fossil fuels, deforestation, and industrial processes, have greatly increased the amount of carbon dioxide in the atmosphere.

The natural carbon sinks are not capable of absorbing all the excess carbon dioxide: The carbon dioxide cycle relies on natural carbon sinks such as forests and oceans to absorb carbon dioxide from the atmosphere. However, these natural carbon sinks have limits to their capacity and are becoming saturated with excess carbon dioxide.

The rate of carbon dioxide emissions is much faster than the rate at which natural carbon sinks can absorb carbon dioxide: The natural carbon sinks have a limited capacity to absorb carbon dioxide, and their absorption rate is much slower than the rate at which carbon dioxide is being emitted by human activities.

This means that the excess carbon dioxide remains in the atmosphere for longer periods of time, contributing to the buildup of carbon dioxide in the atmosphere.

To know more about carbon dioxide here

https://brainly.com/question/3049557

#SPJ4

Answer: –1,267.2 kJ

Explanation: B on edge, thank me later ;-)

–1,267.2 kJ is the enthalpy of the given reaction. Therefore, the correct option is option A among all the given options.

Enthalpy is a thermodynamic system's internal energy total as well as the volume times pressure ratio. Enthalpy is a property or state function that resembles energy; it has the same dimensions as energy and is therefore measured in joules or ergs. The value of enthalpy is solely dependent on the temperature, pressure, as well as composition of the system, not on its history.

The shift in the internal energy equals equivalent to the heat transmitted to, much less than the jobs completed by, the system, in accordance with the principle of energy conservation. The enthalpy change is precisely equal to the heat transmitted to the system if the sole work performed is a change in volume at constant pressure.

ΔH = ΔH for product - ΔH for reactant

     = 3,572.1 kJ –1,267.2 kJ

    = –1,267.2 kJ

Therefore, the correct option is option A.

To learn more about enthalpy, here:

https://brainly.com/question/24170335

#SPJ7