What type of molecule is shown below?
A. Alkene
B. An Alkane-alkene
C. An alkane-alkyne
D. An alkane

Answer:

liquid water

Explanation:

becouse liquid water is 30C

Answer:

one: b

two: b

three: a

four: b

Explanation:

In the ferric chloride test for phenols, a few drops of ferric chloride are added to the sample. If phenols are present, a violet color will be observed. This indicates that the crude sample is impure. The recrystallized sample, on the other hand, does not contain phenols, as evidenced by the absence of color change upon addition of ferric chloride.

Purity of crude and recrystallized sample of aspirin based on obervations for the ferric chloride test for phenols

In the case of aspirin, it is important to test for the presence of phenols because the synthesis of aspirin involves the reaction of salicylic acid with acetic anhydride in the presence of a catalyst (sulfuric acid). This reaction can produce a side product called para-hydroxybenzoic acid (PHBA), which is a phenol. PHBA is formed due to the attack of the hydroxyl group on salicylic acid on the carbonyl group of acetic anhydride. If PHBA is not removed from the aspirin, it can cause unwanted side effects, such as stomach upset and irritation.Therefore, it is important to test for the presence of phenols in the crude and recrystallized samples of aspirin.

The ferric chloride test is a common test that is used to detect the presence of phenols. In this test, a few drops of ferric chloride are added to the sample. If phenols are present, a violet color will be observed. If phenols are absent, no color change will occur.

Based on the observations for the ferric chloride test, it can be concluded that the crude sample of aspirin contains phenols, as evidenced by the violet color that is observed upon addition of ferric chloride.

This indicates that the crude sample is impure and contains PHBA. The recrystallized sample, on the other hand, does not contain phenols, as evidenced by the absence of color change upon addition of ferric chloride. This indicates that the recrystallized sample is pure and does not contain PHBA. Therefore, the recrystallized sample is of higher quality than the crude sample.

Thus, in the ferric chloride test for phenols, a few drops of ferric chloride are added to the sample. If phenols are present, a violet color will be observed indicating that the crude sample is impure. The recrystallized sample, on the other hand, does not contain phenols, as evidenced by the absence of color change upon addition of ferric chloride indicating that the recrystallized sample is of higher quality than the crude sample.

To learn more about FeCl3 :

https://brainly.com/question/19585444

#SPJ11

Answer:

combustion is a high-temperature exothermic redox chemical reaction between a fuel and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.

1. The longer distance for each choice is:

2. The complete statements are as follows;

3. The basic unit of length in the metric system is the meter and is represented by a lowercase m.

4. The meter is defined as the distance traveled by light in absolute vacuum in 1⁄299,792,458 of a second.

5. The values that complete each statement is given below:

6. The larger value for each option is:

7. The number of millimeters in 1 centimeter is 10 mm

8. Using the ruler and line, the answers are:

The unit for measuring distance in the metric system is the meter. Smaller and larger values of the meter are also used such as millimeters, centimeters, kilometers, etc.

Other units for measuring distance include yards, miles, and inches.

The various units for measuring distance can also be interconverted using their conversion factors.

Learn more about the metric system at: https://brainly.com/question/1837503

#SPJ1

Answer:

Fe

Iron – Ferrum (Fe)

Iron's Latin name, 'ferrum', gives it its symbol Fe; it simply means 'iron' or 'sword', and is possibly of Semitic origin.

The height of a ramp does not directly determine the strength of the frictional force between a book and an object.

The strength of the frictional force between a book and an object is not directly influenced by the height of a ramp. The nature of the surfaces in contact, the force forcing the surfaces together (normal force), and the coefficient of friction are some of the variables that affect the frictional force between two surfaces.

The coefficient of friction between the book and the object plays a major role in determining the strength of the frictional force.

Learn more about frictional force:https://brainly.com/question/30280206

#SPJ1

As atomic radius decreases, electronegativity increases. This is mostly because a smaller atomic radius represents a stronger hold on the valence electrons.

The grams of potassium chloride (KCI are needed to prepare 0.750 L of a 150 M solution of potassium chloride in water is the

83.81 g.

Given that :

Molarity of the KCl = 1.50 M

Volume of the potassium chloride = 0.750 L

The Molarity expression is given below :

Molarity = moles / volume in L

moles = Molarity × volume

moles = 1.50 × 0.750  

moles = 1.125 mol

molar mass of the KCl = 74.5 g/mol

Mass of the KCl = moles × molar mass

Mass of the KCl = 1.125 × 74.5

                          = 83.81 g

Thus, the mass of KCl is 83.81 g

To learn more about moles here

https://brainly.com/question/26416088

#SPJ4

The radioactive isotope Technium-99 decays most likely through alpha decay (99tc). An atomic nucleus emits an alpha particle during the radioactive decay process known as "alpha decay".

and then changes or "decays" into a separate atomic nucleus with a mass number that is decreased by four and an atomic number that is decreased by two. The nucleus of an atom of helium-4 is the same as an alpha particle. Radioisotopes are an element's radioactive isotopes. They are the atoms with unstable neutron-proton combinations or excess energy in their nuclei. During those processes, the radionuclide is said to experience radioactive decay, albeit the surplus energy may be put to use in any number of ways.

Learn more about radioactive isotope here

https://brainly.com/question/1907960

#SPJ4

Answer:

The Answer is 4.08

Explanation:

to find the ph of a buffer solution use this formula PH=Pka=log(Acid/base)

we are given Ka to find pka we use Pka= -log(ka) so,

Pka= -log(1.4 *10^-4)

Pka= 3.854

Now we can do.

.222M Lactic Acid = Acid

.132M Sodium Lactate = Base

Ph = 3.854+log(.222/.132)

= 4.08

Answer:

yes

Explanation:

as the salt is a polar compound which means that its dissolvable in water

so the salt would be solute and the water is the solvent

A polymer-based material can be characterized using various techniques and instruments.

Here's how to determine whether the polymer is a thermoset, the amount of filler present in it, what the filler is, and the quantity of antioxidants and UV absorbents present:

1. To determine if the polymer is a thermoset, heat it. Thermosets don't melt, but thermoplastics do.

2. To determine the amount of filler in the polymer, weigh a sample of the polymer and then burn it. The residue will be the filler. Subtract the residue's mass from the polymer's initial weight to determine the filler's weight.

3. To determine what filler is present, observe the residue after burning.

4. UV absorbents can be detected using UV-Vis Spectroscopy, while antioxidants can be determined using FTIR Spectroscopy.

5. To determine if the material has dye or pigment coloring, use colorimetry to measure its color, then compare it to the reference color of the polymer. If the color is different, it has dye or pigment coloring.

6. The polymer's thermoset can be identified using Differential Scanning Calorimetry (DSC) to examine the melting temperature, which is unique to each thermoset.

To know more about polymer-based material visit:-

https://brainly.com/question/31017656

#SPJ11

Answer:

The pH scale measures acidity of a substance. known as potential of hydrogen, it varies from 0 to 14 with 7 being the pH value of a neutral solution. Below 7 shows the substance is acidic in nature and above 7 is alkaline in nature. pH 0-3 are considered strong acids while pH 4-6 are weak acids. pH 8-10 are weak alkalines and pH 11-14 are strong alkalines. This is a general trend and there may be exeptions especially if the substance has a negative pH. However, it would not be covered likely unless you are doing university chemistry.

No, a stationary state is one that has a specific amount of energy, total angular momentum, and parity; in a stable state, the particle is moving while possessing all of these physical characteristics.

A negative charge subatomic particle known as an electron can either be free or attached to an atom (not bound). Each of the three main types of components within an atom is an atom that is bonded to it; the other three are proton and neutrons.

The electron, the smallest constituent part of an atom, has a negative surface charge. Protons and electrons are present in an atom in a neutral state in an equal number. The hydrogen ion only possesses one atom or one proton. On the other way, the uranium atom possesses 92 protons, which means 92 electrons.

To know more about Electron visit:

https://brainly.com/question/20513633

#SPJ4

they become liquified

Answer:

Color Change.

Production of an odor.

Change of Temperature.

Evolution of a gas (bubbles)

Precipitate (formation of a solid)  

There are 5 so you can choose 4.

The four signs that a chemical reaction has occurred are as follows:

A chemical reaction may be defined as a process that significantly involves the chemical transformation of one set of chemical substances to another. This process involves the utilization of substances known as reactants that are transformed into other substances known as products.

Every chemical reaction involves the four signs which are mentioned above. These signs are delivered by chemical reactions along with determined products. But the mass of the reactants and products always remains the same. Precipitation is only visualized in specific reactions with the possessions of certain characteristics.

Therefore, the four signs that a chemical reaction has occurred are well-mentioned above.

To learn more about Chemical reactions, refer to the link:

https://brainly.com/question/11231920

#SPJ2

Answer:

CuSO4

because copper formula is Cu

formula of sulfur is S and Oxygen O

The Earth's atmospheric CO2 concentration was around 280ppm before human activities, but since the Industrial Revolution, burning fossil fuels has increased it to above 400ppm, well outside the range.

The concentration of CO2 in the Earth's atmosphere prior to significant human influences was 280ppm.

Before human activities, such as burning fossil fuels, deforestation, and industrial processes, the concentration of carbon dioxide in the atmosphere was relatively stable for thousands of years. This pre-industrial concentration of CO2 was around 280 parts per million (ppm).

To put it into perspective, 280ppm means that for every million molecules of air, around 280 of them were CO2 molecules. This level was maintained through a balance between natural sources of CO2, like volcanic activity and respiration, and natural sinks, such as photosynthesis and ocean absorption.

Since the Industrial Revolution, the burning of fossil fuels has significantly increased the concentration of CO2 in the atmosphere. Currently, the concentration is above 400ppm, which is considered to be well outside the range seen in the past 800,000 years.

In summary, the concentration of CO2 in the Earth's atmosphere prior to significant human influences was approximately 280ppm.

To know more about atmospheric Visit:

https://brainly.com/question/32274037

#SPJ11

Answer:

28g

Explanation:

A soft, silvery-white metal combines with a yellow gas to form a white crystal-like solid. Option D. The change is not a physical change because a new substance was formed.

Physical changes are changes affecting the shape of a chemical substance, but no longer its chemical composition. bodily changes are used to separate mixtures into their element compounds, however, cannot generally be used to split compounds into chemical factors or less difficult compounds.

In a physical change, the fabric worried inside the alternate is structurally the same before and after the exchange. varieties of a few physical modifications are texture, shape, temperature, and trade inside the country of depend. Trade in the texture of a substance is an alternative in the manner it feels.

Learn more about physical change here:-https://brainly.com/question/960225

#SPJ4

Disclaimer:- your question is incomplete, please see below for the complete question.

A. The change is a physical change because the yellow gas changed into a solid.

B. The change is a physical change because a new substance was not formed.

C. The change is not a physical change because the color of the metal changed.

D. The change is not a physical change because a new substance was formed.

Explanation:

a. The melting point is at 20C and the boiling point is at 80C. The melting point is when a solid is going through a phase change to become a liquid, that is the 1st plateau in the graph. The boiling point is when the liquid is going through vaporization to become a gas. That is the second plateau.

b. At 30C, it is a liquid, since our melting point is at 20C.

c. The substance before 20C is a solid, as we add energy, it will melt and become a liquid.

The graph is different for each substance but in this same configuration where a change in the graph is a different phase or a phase change.

Where that first incline = solid

1st plateau= melting or freezing

2nd incline= liquid

2nd plateau= vaporization or condensation

3rd incline= gas

8.52 m is the height of a barometer column based on 1-iodododecane.

A barometer is described as a scientific instrument that is used to measure air pressure in a certain environment.

For the given question we will use the below formula:

P = dgh, where

g = gravitational force = 9.8 m/s²

h = height

First we calculate the height of the barometer column for the mercury:

Density of mercury = 13.6g/ml (given)

Given pressure = 752 torr =100258.144 N/m²

Height of barometer for mercury = 100258.144 / (13.6×9.8) = 752.23= 0.752

Now we calculate the height of barometer by using the below formula:

d₁h₁ = d₂h₂, where

d₁ = density of 1-iodododecane = 1.20g/mol (given)

h₁ = to find?

d₂, h₂ = density & height with respect to mercury

On putting all values in the above equation we get,

h₁ = 13.6×0.752  / 1.20 = 8.52m

Hence, 8.52m is the height of barometer.

Learn more about barometer at: https://brainly.com/question/24939205

#SPJ1

Complete question:

The compound 1-iodododecane is a nonvolatile liquid with a density of 1.20g/ml. the density of mercury is 13.6g/ml. part a what do you predict for the height of a barometer column based on 1-iodododecane, when the atmospheric pressure is 752 torr ?

The wavelength of light required to dislodge an electron from the surface of cesium is approximately 600.7 nm.

To find the wavelength, we can use the equation E = hc/λ, where E is the energy per photon, h is Planck's constant (6.626 x 10^-34 Js), c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength. First, we need to convert the given energy (207 kJ/mol) to energy per photon in Joules.

Since 1 mole of photons contains Avogadro's number (6.022 x 10^23) of photons, we can divide the energy by this number:
(207 x 10^3 J/mol) / (6.022 x 10^23 photons/mol) ≈ 3.44 x 10^-19 J/photon

Now we can use the equation:
λ = hc/E
λ = (6.626 x 10^-34 Js) * (3.00 x 10^8 m/s) / (3.44 x 10^-19 J)
λ ≈ 5.76 x 10^-7 m

To express the wavelength in nanometers, we multiply by 10^9:
λ ≈ 576 nm (rounded to three significant figures)

The wavelength of light required to dislodge an electron from the surface of cesium via the photoelectric effect is approximately 576 nm.

To know more about wavelength, click here

https://brainly.com/question/31143857

#SPJ11

The new temperature in Celcius is approximately 61.25 °C.

To solve this problem, we can use the combined gas law equation, which relates the initial and final states of a gas:

(P1 * V1) / T1 = (P2 * V2) / T2

Where:

P1 = Initial pressure

V1 = Initial volume

T1 = Initial temperature

P2 = Final pressure

V2 = Final volume

T2 = Final temperature

Given:

P1 = 721 mmHg

V1 = 0.325 L

T1 = 305.15 K

P2 = 901 mmHg

V2 = 0.286 L

We need to find T2, the final temperature in Celsius.

First, let's convert the pressures from mmHg to atmospheres:

P1 = 721 mmHg * (1 atm / 760 mmHg) = 0.948 atm

P2 = 901 mmHg * (1 atm / 760 mmHg) = 1.186 atm

Now, let's rearrange the combined gas law equation to solve for T2:

T2 = (P2 * V2 * T1) / (P1 * V1)

Substituting the values:

T2 = (1.186 atm * 0.286 L * 305.15 K) / (0.948 atm * 0.325 L)

T2 ≈ 334.4 K

To convert this temperature to Celsius, we subtract 273.15:

T2 ≈ 334.4 K - 273.15 ≈ 61.25 °C

Therefore, the new temperature is approximately 61.25 °C.

Learn more about temperature from the given link

https://brainly.com/question/27944554

#SPJ11

Answer:

As you move down the periodic table, atomic radii increase (more shells in the electron configuration), and the first ionization energy decreases. Electrons of the outermost shell of the atom are further away, and their attraction to the nucleus, therefore, decreases, making it easier for elements with high electronegativity such as Fluorine to form compounds with them.

Answer:

397,570 g/m^3

Explanation:

The volume of the cylinder can be calculated using its height and diameter.

Mass of the soil sample (m) = 30 g

Height of the cylinder (h) = 6 cm

Diameter of the cylinder (d) = 4 cm

First, we need to calculate the radius (r) of the cylinder

Radius (r) = diameter / 2 = 4 cm / 2 = 2 cm = 0.02 m

Now, we can calculate the volume (V) of the cylinder

V = π * r^2 * h

V = 3.14159 * (0.02 m)^2 * 0.06 m

V = 7.5398 E-5 m^3

Calculate the bulk density (ρ) using this formula

ρ = m / V

ρ = 30 g / 7.5398 E-5 m^3

ρ = 397,887 g/m^3

Answer:

12hrs

Explanation:

Hope this helps

Answer:

12 hours

Explanation:

it's half of the time in a day now