Which of the following characteristics was NOT included in Dmitri Mendeleev's periodic table?O distribution of elements determined by electron configurationO heavier elements placed in rows closer to the bottom of the tableO elements arranged by increasing atomic massO elements placed in columns based on chemical properties

The liquid substance used in the laboratory for dissolving dry mortar on floor flies is hydrochloric acid.

Hydrochloric acid is a strong acid that can dissolve many materials, including dry mortar.

Hydrochloric acid also known as muriatic acid or sulfuric acid, are commonly used to dissolve hardened mortar or concrete residues.

To use hydrochloric acid to dissolve dry mortar, you will need to mix the acid with water in a ratio of 1 part acd to 10 parts water.

You should then apply the mixture to the dry mortar using a brush or spray botle.

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Answer:

Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process (see the 1ˢᵗ law of thermodynamics).

 Thermodynamics, and many other related fields, phase transitions are the physical processes of transition between a state of a medium, identified by some parameters, and another one, with different values of the parameters.

The balanced equation is: 4 \(H_2S\)+ 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

The given chemical equation is unbalanced. To balance it, we need to adjust the coefficients in front of each chemical species until the number of atoms on both sides of the equation is equal.

The unbalanced equation is:

2 \(H_2S\)+ 3 \(O_2\)→ \(SO_2\)

Let's start by balancing the sulfur (S) atoms. We have two sulfur atoms on the left side and one sulfur atom on the right side. To balance the sulfur, we can place a coefficient of 2 in front of the \(SO_2\):

2 \(H_2S\)+ 3 \(O_2\)→ 2 \(SO_2\)

Now, let's balance the hydrogen (H) atoms. We have four hydrogen atoms on the left side (2 from each \(H_2S\)) and none on the right side. To balance the hydrogen, we can place a coefficient of 4 in front of the water (H2O) on the right side:

2 \(H_2S\)+ 3 \(O_2\)→ 2 \(SO_2\)+ 4 \(H_2O\)

Finally, let's balance the oxygen (O) atoms. We have six oxygen atoms on the right side (3 from \(O_2\) and 3 from 2 \(SO_2\)) and three on the left side (2 from \(H_2S\)). To balance the oxygen, we can place a coefficient of 3/2 in front of the O2:

2 \(H_2S\)+ (3/2) \(O_2\)→ 2 \(SO_2\)+ 4 \(H_2O\)

To remove the fractional coefficient, we can multiply all coefficients by 2:

4 \(H_2S\) + 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

Now the equation is balanced, with an equal number of atoms on both sides. The balanced equation is:

4 \(H_2S\)+ 3 \(O_2\)→ 4 \(SO_2\)+ 8 \(H_2O\)

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Answer:

the best guess would have to be C

Answer:

         B             B

W      BW          BW        

W       BW          BW

Explanation:

Hope this helps

This reaction achieved by  Friedrich Wöhler led to the birth of synthethic organic chemistry.

Prior to the successful synthesis of urea by Friedrich Wöhler in the year 1828, chemists believed that it is purely impossible to synthesize various organic substances in the laboratory owing to the absence of an imaginary "vital force". responsible for the formation of those substances.

However, the synthesis of urea by Friedrich Wöhler opened up the idea of laboratory organic synthesis which have blossomed into the present synthetic organic chemistry.

The equation for the synthesis of urea from ammonium cyanate is shown in the image attached.

Organic compounds which occur in nature could now be synthesized and studied under laboratory conditions.

Hence, this reaction achieved by  Friedrich Wöhler led to the birth of synthethic organic chemistry.

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The balanced chemical equation for the reaction between strontium and oxygen can be written as follows: 2 Sr (s) + \(O_2\)(g) → 2 SrO (s).

In this equation, solid strontium (Sr) reacts with gaseous oxygen (\(O_2\)) to produce solid strontium oxide (SrO).

To determine the mass of product expected to form in this reaction, we need to consider the molar ratio between strontium and strontium oxide. From the balanced equation, we can see that 2 moles of strontium react to produce 2 moles of strontium oxide.

The molar mass of strontium (Sr) is 87.62 g/mol, and the molar mass of strontium oxide (SrO) is 119.62 g/mol. Since the molar ratio is 1:1 between strontium and strontium oxide, the mass of strontium oxide formed will be equal to the mass of strontium used.

In this case, the student added 4.93 g of strontium to the crucible. Therefore, the expected mass of strontium oxide formed will also be 4.93 g.

It's important to note that this calculation assumes that the reaction proceeds to completion, meaning that all of the strontium reacts with oxygen. In actual laboratory conditions, the yield of the reaction may be less than 100% due to factors such as incomplete reaction, side reactions, or product loss.

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Answer: improvements in nutrition

Explanation:

Answer:Look at the graph above. Human population increased dramatically at certain times. The graph begins 10,000 BC, although you can't really see the line. Population starts to rise perceptibly at around 1800 BC. The numbers begin to rise dramatically about 200 years ago. What causes these changes

Explanation:

Answer:

The watch is 40.9 years old.

Explanation:

To know how many years old is the watch we need to use the following equation:

\( I_{(t)} = I_{0}e^{-\lambda t} \)   (1)

Where:

\(I_{(t)}\): is the brightness in a time t = (1/10)I₀

\(I_{0}\): is the initial brightness

λ: is the decay constant of tritium

The decay constant is given by:

\( \lambda = \frac{ln(2)}{t_{1/2}} \)   (2)

Where:

\(t_{1/2}\): is the half-life of tritium = 12.3 years

By entering equation (2) into (1)  we have:

\( I_{(t)} = I_{0}e^{-\lambda t} = I_{0}e^{-\frac{ln(2)}{t_{1/2}}t} \)

\( \frac{I_{(t)}}{I_{0}} = e^{-\frac{ln(2)}{t_{1/2}}t} \)

By solving the above equation for "t" we have:

\( ln(\frac{I_{(t)}}{I_{0}}) = -\frac{ln(2)}{t_{1/2}}t \)

\( t = -\frac{ln(\frac{I_{(t)}}{I_{0}})}{\frac{ln(2)}{t_{1/2}}} = -\frac{ln(\frac{1}{10})}{\frac{ln(2)}{12.3}} = 40.9 y \)

Therefore, the watch is 40.9 years old.

I hope it helps you!

sana maka tulong ❣️

The pressure inside the tire is approximately 1.970796 newtons per square centimeter (N/cm²) when measured in those units.

To convert the pressure from pounds per square inch (psi) to newtons per square centimeter (N/cm²), we need to use the conversion factors between these units.

First, let's convert pounds to newtons:

1 pound = 0.45359237 kilograms

1 kilogram = 9.80665 newtons

Next, let's convert square inches to square centimeters:

1 square inch = 6.4516 square centimeters

Now, we can perform the conversion:

1 psi = (0.45359237 kg) × (9.80665 N/kg) / (6.4516 cm²)

≈ 0.070307 N/cm²

Therefore, the pressure inside the tire of 28.0 psi is approximately equal to 28.0 × 0.070307 N/cm², which is approximately 1.970796 N/cm².

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Answer:

Most aren't able to take in carbon dioxide gas from the air or produce any oxygen.

Explanation:

science bro

The water in a garden hose flows at a rate of 10.0 liters per minute. Therefore, 158 gal/hr is the flow rate in gallons per hour.

Flow rate is the amount of liquid that travels in a given length of time. Furthermore, the flow rate is affected by the channel through which the liquid is travelling, the area of the pipe, as well as the velocity of something like the liquid. Furthermore, the formula is. Fluid dynamic rate = pipe or channel area x liquid velocity.

The volume flow value is the rate of liquid (water flow rate formula) passing through every place in an area over time.

1 gal = 3.79 L

60 min = 1 hr

10.0 L/min x 60 min/hr x 1 gal/3.79 L = 158 gal/hr

Therefore, 158 gal/hr is the flow rate in gallons per hour.

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a)possesses a negative charge - electron

b)has no charge - neutron

c)has a mass slightly less than that of a neutron - proton

d)has a charge equal to, but opposite in sign from, that of an electron - proton.

What has a negative charge?

Electrons have a negative charge. The charge on the proton and electron are exactly the same size but opposite. Neutrons have no charge. Since opposite charges attract, protons and electrons attract each other.

What are the four properties of neutrons?

Neutrons are neutral particles – with no net electric charge.

Neutrons have a non-zero magnetic moment.

Free neutrons (outside a nucleus) are unstable and decay via beta decay.

Is a neutron's mass slightly less than a proton's?

The mass of a neutron is slightly greater than the mass of a proton, which is 1 atomic mass unit (AMU).

Is the charge of an electron opposite to the charge of a proton?

Electrons and protons have equal and opposite charges. The magnitude of this charge is 1.6×10−19 Coulomb.

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Nuclear fusion occurs in stars but not on earth because Elements capable of undergoing fusion can’t be enriched on Earth. Option D. This is further explained below.

Generally, Nuclear fusion is simply defined as a nuclear reaction in which limited atomic nuclei merge to generate a heavier nucleus, releasing energy in the process.

In conclusion, Because elements susceptible to conducting fusion cannot be concentrated on Earth, nuclear fusion happens in stars and not on Earth.

CQ

1.Why does nuclear fusion occur in stars but not on Earth?

A.There are no elements on Earth that can undergo fusion.

B.Too many free neutrons are present on Earth.

C.Fusion reactions require a lot of heat and pressure.

D.Elements capable of undergoing fusion can’t be enriched on Earth.

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As a result, the ideal gas law is applied, and the pressure of the gas in the container is 1.44 atm.

The Kelvin temperature and hence the volume are going to be in direct proportion when the pressure on a sample of a dry gas is held constant, according to the definition of the Charles Law Formula. PV = k is the law's equation, and k might be a constant.

This issue can be resolved by applying the ideal gas law:

PV = nR

T = -52 °C + 273.15 = 221.15 K

n = 0.642 mol

V = 8.6 L

T = 221.15 K

\(R = 0.0821 L·atm/mol·K (gas constant for ideal gases)\)

PV = nRT

P = nRT/V

P = (0.642 mol)(0.0821 L·atm/mol·K)(221.15 K)/(8.6 L)

P = 1.44 atm

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Bodies of water can have a significant impact on climate in several ways, including through the influence of sea breezes, land breezes, and ocean currents.

Sea breezes occur when cooler air from over the water moves towards the warmer air over land. This movement of air can affect the temperature and humidity of coastal areas. During the day, the land heats up faster than the ocean, creating a low-pressure area over the land. The cool air over the ocean then moves towards the warmer, low-pressure air over the land, creating a sea breeze. The opposite occurs at night, when the land cools off faster than the ocean, creating a high-pressure area over the land, and causing a land breeze to blow from the land towards the ocean.

Ocean currents also play a significant role in climate. These currents are like rivers in the ocean, moving water from one place to another. They can transport heat from warmer to cooler areas, affecting the temperature and weather patterns of coastal regions. For example, the Gulf Stream, a warm ocean current that originates in the Gulf of Mexico and flows towards Europe, helps keep the climate of coastal Europe relatively mild.

In addition to sea breezes and ocean currents, bodies of water can also affect climate through their thermal properties. Water has a higher specific heat than land, meaning it can absorb and retain more heat energy. This can result in cooler temperatures near bodies of water during the summer and warmer temperatures during the winter, as the water releases or absorbs heat from the surrounding air.

Overall, bodies of water have a significant impact on climate through their influence on sea breezes, land breezes, ocean currents, and thermal properties. Understanding these processes is essential for predicting and managing climate patterns, particularly in coastal areas.

The qualities Tom Walker and his wife have in common were they both were grasping and without conscience

The question has been asked from the story "The Devil and Tom Walker" by Washington Irving. As the story describes Tom's encounter with the devil, he is a complex character. However, he and his wife seem to complement each other well and have some personality traits in common. Tom and his wife are both miserly, avaricious, cruel, and morally void.

More so than her husband, Tom's stereotypically nagging, scolding wife verbally and perhaps even physically abuses him when she's not hoarding his valuables. Tom's wife courageously decides to accept Old Scratch's offer to sell her husband's soul for money when Tom first rejects it. She takes the family's silver into the swamp with her so she may haggle with the devil.

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Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.

Explanation:

ionic bond is a bonding between a non-metal and a metal, that occurs when change atoms (ions) attract.

Answer:

lt serves as a home where crews of astronauts and cosmonauts live. The space station is also a unique science laboratory. Several nations worked together to build and use the space station. The space station is made of parts that were assembled in space by astronauts.

Explanation:

Answer:

Calcium flouride?

Explanation:

Quite self explanatory

Answer:  1 molecule of \(H_2\) reacts with 1 molecule of \(Cl_2\) to give 2 molecules of HCl.

1 mole of \(H_2\) reacts with 1 mole of \(Cl_2\) to give 2 moles of HCl.

Explanation:

The given balanced reaction is:

\(H_2(g)+Cl_2(g)\rightarrow 2HCl(g)\)

On the particulate level :

1 molecule of \(H_2\) reacts with 1 molecule of \(Cl_2\) to give 2 molecules of HCl.

On molar level:

1 mole of \(H_2\) reacts with 1 mole of \(Cl_2\) to give 2 moles of HCl.

Answer:

c2h4s

Explanation:

You can reduce s2 to s

It is an amine, and it has less polar nitrogen-hydrogen and oxygen-hydrogen bonds.

A compound's boiling point is a physical characteristic. These intramolecular linkages between the molecules that make up a chemical affect these physical characteristics.

Alcohols and amino acids have the same kind of intermolecular linkages. The hydrogen bond is the name of this kind of bond.

The electrical attraction between a hydrogen atom from one molecule and an electronegative atom from a nearby molecule is known as a hydrogen bond.

The strength of the bond is in the following order: H.....F > H.....O > H......N

The H....N hydrogen bonds exist in amines, whereas the H....O hydrogen bonds exist in alcohols.

Consequently, the alcohol's hydrogen bonds are stronger and it will impart a higher boiling point on the compound.

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Answer:uses world like

Explanation:

Answer:The colour and distribution of the organism's biochromes

Explanation:

The colour and distribution of the organism's biochromes (pigments), particularly the relative location of differently coloured areas; the shape, posture, position, and movement of the organism; and the quality and quantity of light striking the organism

\(\implies\) The correct answer is (B) 0.00037

\(\bf{ \underline{Step \: 1)} :3.7 × 10^{-4 }we \: can \: write \: as \:37 × 10^{-5}}\)

\(\bf{ \underline{Step \: 2)} :37 × 10^{-5 } \: we \: can \: write \: as \: 37 × \frac{1}{10^5}}\)

\(\bf{ \underline{Step \: 3)} :37 × \frac{1}{10^5}\: we \: can \: write \: as \: (37 × \frac{1}{(10)(10)(10)(10)(10)}})\)

\(\bf{ \underline{Step \: 4)} :37 × \frac{1}{(10)(10)(10)(10)(10)} we \: can \: write \: as \: ( 37 × \frac{1}{100000}})\)

\(\bf{ \underline{Step \: 5)} :37 × \frac{1}{100000} \: we \: can \: write \: as \: \frac{37}{100000}}\)

\(\bf{ \underline{Step \: 6)} :\frac{37}{100000} \: we \: can \: write \: as \: 0.000037}\)

The amount, in kJ, of heat needed to completely vaporize 50.0g of water at 100°C is 118.8 kJ.

The heat needed to completely vaporize 50.0g of water at 100°C can be calculated using the following formula:

q = m x Hv

where:

First, we need to convert 50.0g to moles by dividing by the molar mass of water which is approximately 18.015 g/mol3:

moles of water = 50.0 g / 18.015 g/mol moles of water = 2.776 mol

Thus:

q = (2.776 mol) x (40.65 kJ/mol) q = 112.8 kJ

In other words, 112.8 kJ of heat is needed to completely vaporize 50.0g of water at 100°C.

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Answer:

24.31 g/mol.

Explanation:

moles =mass/molar mass

n=w/m

The three correct options are pH 1 - random coil, pH 7 - helix and pH 11 - random coil.

At a pH of 1, the solution is acidic and the lysine residues will be mostly positively charged. The positive charges on the amino groups can lead to repulsion between neighboring lysine residues, making it energetically unfavorable for the polymer chain to adopt an alpha-helical conformation. Therefore, at a pH of 1, the conformation of polylysine is likely to be a random coil.

At a pH of 7, which is close to the physiological pH of most living organisms, the amino and carboxyl groups in lysine residues are mostly neutral, allowing the polymer chain to adopt a more stable alpha-helical conformation.

At a pH of 11, the solution is basic and the lysine residues will be mostly negatively charged. This can lead to repulsion between neighboring lysine residues and prevent the formation of an alpha-helical conformation. Therefore, at a pH of 11, the conformation of polylysine is likely to be a random coil.

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The complete question is :

A Homopolymer Of Lysine Residues (Polylysine) Can Adopt An Alpha-Helical Conformation Or A Random Coil Conformation Depending On The PH Of The Solution. Predict Whether The Conformation Of Polylysine Would Be Alpha-Helical Or Random Coil At A PH Of 1, 7, And 11. (Choose A Total Of THREE Answers. Choose Either Helix Or Random Coil For PH 1, PH 7, And PH

A homopolymer of lysine residues (polylysine) can adopt an alpha-helical conformation or a random coil conformation depending on the pH of the solution. Predict whether the conformation of polylysine would be alpha-helical or random coil at a pH of 1, 7, and 11. (Choose a total of THREE answers. Choose either helix or random coil for pH 1, pH 7, and pH 11).

options:

pH 1 - helix

pH 1 - random coil

pH 7 - helix

pH 7 - random coil

pH 11 - helix

pH 11 - random coil