How many amino acids can compose a protein molecule?
A) Between 50 and 5,000 amino acids.
B) Between 500 and 5,000 amino acids.
C) Between 20 and 2,000 amino acids.
D) Between 50 and 2,000 amino acids.

Answer:

A) In aldehydes, the carbon is always joined to at least one hydrogen atom.

Explanation:

Aldehydes and Ketones are organic compounds.

The main difference between them is that aldehydes have the carbon atom attached to at least one hydrogen atom.

In ketones, the carbon is attached to another carbon.

To reiterate, the striking difference between the two families is that in alkanals, a hydrogen atom is directly attached to the carbonyl group while in alkanones, no hydrogen atoms is attached to the carbonyl group but two bulky alkyl groups.

Answer: \(FeSO_4+CaCl_2\rightarrow CaSO_4+FeCl_2\)

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.  

The balanced chemical equation is:

\(FeSO_4+CaCl_2\rightarrow CaSO_4+FeCl_2\)

The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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Answer:

31.6%

Explanation:

find the molecular formular

(52×2)+(16×3)=152

since the %of oxygen is required

MF of o in Cr2O3 =16×3=48

%O= 48/152×100= 31.6%

GIVEN

• 800g of H2O > 800/1000= ,0.8 Litres of water

• Concentration = 6.25 M

• Molar mass acetic acid = 60.05g/mol

Under acidic conditions, the first step of nucleophilic addition to an aldehyde is proton transfer to carbonyl oxygen. This results in the formation of a resonance-stabilized intermediate known as the protonated hemiacetal.

Subsequently, the nucleophile can attack the carbonyl carbon, leading to the formation of a new carbon-oxygen bond and the elimination of the protonated leaving group. Option b, nucleophilic attack of the carbonyl carbon, is the second step of the reaction. Option c, formation of an enolate ion, occurs under basic conditions, while option d, formation of a hydrazone, involves the reaction of the aldehyde with hydrazine and is not typically the first step in a nucleophilic addition reaction.
Under acidic conditions, the first step of nucleophilic addition to an aldehyde is: a. Proton transfer to carbonyl oxygen.

In this step, the acidic conditions provide a proton (H+) that is transferred to the carbonyl oxygen, which has a partial negative charge due to its electronegativity. This protonation of the carbonyl oxygen makes the carbonyl carbon more electrophilic, allowing the subsequent nucleophilic attack to occur more easily.

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The element symbol for Gold is Au.

The Element Symbol for Gold is Au

Hope this helps please give me Brainliest if this is correct. :)

Answer:

23.5 grams of AlBr3 will be produced by 27.20 grams of NaBr

Explanation:

The balanced equation here is

6NaBr + 1AlO3 = 3Na2O + 2AlBr3

6 moles of NaBr are required to produce 2 moles of AlBr3

Mass of one mole of NaBr = 102.894 g/mol

Mass of one mole of AlBr3 = 266.69 g/mol

Mass of 6 moles of NaBr = 6*102.894 g/mol

Mass of two moles of AlBr3 = 2*266.69 g/mol

6*102.894 g  NaBr produces 2*266.69 g of AlBr3

23.5 grams of AlBr3 will be produced by (6*102.894)/(2*266.69 )*23.5 = 27.20 grams of NaBr

Two properties of water that make it more suitable than ammonia or hydrogen sulfide to support life on Earth are: High heat capacity and Universal solvent.

What is heat capacity?

Water has a high specific heat capacity, which means it can absorb and release large amounts of heat energy without significant changes in temperature. This helps to stabilize the temperature of the environment and prevent drastic fluctuations that could be harmful to life.

What is an Universal solvent?

Water is a universal solvent, which means it can dissolve many different substances. This property is important for the transport of nutrients and waste products in living organisms, as well as the chemical reactions that occur within cells. Ammonia and hydrogen sulfide, on the other hand, have limited solubility and would not be as effective in supporting the necessary chemical reactions for life.

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Answer:

b

Explanation:

a p e x :)

The models affected by new evidence are B) Models are changed if they don't fit new data.

Version becoming is the degree of ways nicely a device studying version generalizes information similar to that with which it turned into educated. a good version match refers to a version that correctly approximates the output whilst it is provided with unseen inputs. becoming refers to adjusting the parameters inside the model to enhance accuracy.

Commonly, the determined statistics are fixed even as the model is mutable (e.g. due to the fact parameters are expected), so it's far the model this is made to match the facts, no longer the other manner around. (usually, humans mean this case when they say both expressions.)

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Answer:

How many moles Al(NO3)3 in 1 grams? The answer is 0.0046949186022713.

We assume you are converting between moles Al(NO3)3 and gram.

You can view more details on each measurement unit:

molecular weight of Al(NO3)3 or grams

This compound is also known as Aluminium Nitrate.

The SI base unit for amount of substance is the mole.

1 mole is equal to 1 moles Al(NO3)3, or 212.996238 grams.

Note that rounding errors may occur, so always check the results.

Use this page to learn how to convert between moles Al(NO3)3 and gram.

Type in your own numbers in the form to convert the units!

Explanation:

The solution contains approximately 1.693 M KCIO₃  (potassium chlorate) at a temperature of 50°C.

We must take its solubility, concentration, and temperature into account in order to characterize the solution of potassium chlorate dissolved in water.

Calculate the molar mass of  KCIO₃:

K = 39.10 g/mol

Cl = 35.45 g/mol

O = 16.00 g/mol

Molar mass of  potassium chlorate KCIO₃ = 39.10 + (35.45 + 3 × 16.00)

= 122.55 g/mol

Next, we can find the number of moles of  KCIO₃ dissolved in 42 g:

Number of moles = Mass / Molar mass

= 42 g / 122.55 g/mol

= 0.343 moles

To find the concentration of  KCIO₃ in the solution:

Concentration (molarity) = Number of moles ÷ Volume of solution

Volume of water = Mass of water  ÷ Density of water

= 200 g / 0.988 g/mL

= 0.20243 L

Concentration (molarity) = 0.343 moles  ÷ 0.20243 L

= 1.693 M

Thus, the solution contains approximately 1.693 M  KCIO₃ at a temperature of 50°C.

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Examples of radioactive machines and sources include X-ray machines (producing X-rays), nuclear reactors (producing gamma rays and neutrons), and radioactive isotopes (emitting alpha, beta, or gamma radiation). Shielding materials such as lead, concrete, and water are commonly used to protect against ionizing radiation.

Radioactive machines and sources are used in various fields such as medicine, industry, and research. One commonly encountered radioactive machine is the X-ray machine, which produces X-rays.

X-rays are a form of ionizing radiation that can penetrate the body and create images of bones and tissues. X-ray machines are used for diagnostic purposes in medical settings, helping to identify fractures, tumors, and other medical conditions.

Another example is nuclear reactors, which produce both gamma rays and neutrons. Gamma rays are highly penetrating electromagnetic radiation, while neutrons are subatomic particles that can cause ionization upon interaction with matter.

Nuclear reactors are used to generate electricity, conduct scientific research, and produce radioisotopes for medical and industrial applications.

Radioactive isotopes are another source of ionizing radiation. They can emit different types of radiation, including alpha particles, beta particles, and gamma rays. For instance, alpha particles consist of two protons and two neutrons, and they have low penetration power.

Beta particles are high-energy electrons or positrons, while gamma rays are electromagnetic waves with high energy and penetration ability.

To protect against ionizing radiation, various shielding materials are employed. Lead is commonly used due to its high density, which effectively absorbs and attenuates gamma rays and X-rays.

Concrete is another commonly used material, providing sufficient thickness to reduce the penetration of gamma rays. Water is also used as a shielding material, particularly in nuclear reactors, as it can effectively absorb neutrons.

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Answer:

The reactants in this chemical reaction are copper and oxygen, and the indicators of the chemical reaction include a change in color, release of energy in the form of heat, consumption of gas (oxygen), and a change in physical properties.

Explanation:

The reactants in this chemical reaction are copper and oxygen. When copper reacts with oxygen in the air, it forms a new green substance called copper oxide (CuO).

There are several indicators of a chemical reaction that can be observed during this process. The first indicator is a change in color. In this case, the copper metal changes from its original reddish-brown color to a greenish-blue color as it reacts with oxygen to form copper oxide. This change in color is due to the formation of a new substance with different properties than the original reactants.

Another indicator of a chemical reaction is the release or absorption of energy in the form of heat, light, or sound. In this case, the reaction between copper and oxygen is exothermic, meaning that it releases heat energy. This can be observed by feeling the warmth produced by the reaction.

A third indicator of a chemical reaction is the formation of a precipitate or gas. In this case, no precipitate is formed, but a gas (oxygen) is consumed during the reaction.

Finally, a chemical reaction often involves a change in physical properties such as density, melting point, or boiling point. In this case, copper oxide has different physical properties than copper metal, such as being less dense and having a higher melting point.

In summary, the reactants in this chemical reaction are copper and oxygen, and the indicators of the chemical reaction include a change in color, release of energy in the form of heat, consumption of gas (oxygen), and a change in physical properties.

Answer:

The chemicals in the surrounding area can make it harder for minerals to form.

Hope I helped:)

Answer

Explanation

Given that:

The mass of pure silver needed = 800 g

Mass of zinc = 300 g

Mass of silver nitrate = 600 g

What to find:

Will the mass of zinc and silver nitrate be able to make 800 g of pure silver.

Step-by-step solution:

Step 1: Write the balanced equation for the reaction.

Zn + 2AgNO₃ → 2Ag + Zn(NO₃)₂

Step 2: Determine the moles of the reactants.

Using the mole formula, the moles of the reactants will be:

Step 3: Determine the moles of pure silver produced.

Using the mole ratio of Zn to AgNO₃ in the equation and the moles in step 2, we

Answer:

The loss of electrons

Explanation:

Oxidation is any chemical reaction that involves the moving of electrons. Specifically, it means the substance that gives away electrons is oxidized. Therefore, oxidation is the loss of electrons

Answer:

1.583 moles

Explanation:

Rounded Atomic Mass of Au = 197 grams

\(\frac{312}{197} =1.5837, 1.584\)

Answer:

C Ammonia

Pure water is neutral, so pH is about 7

Vinegar is acidic, pH is around 2-3

Ammonia is alkaline, pH around 11.6

Vitamin C is also acidic, pH is around 3.5 to 6

As pH increases with how alkaline the substance is, substances with a lower pH is more acidic, while substances with a higher pH is more alkaline

the question is asking for the highest pH, so you should choose the most alkaline substance

therefore the ans is C, which is ammonia

Answer:

A.The relative humidity is higher at Harry’s school than at Roberta’s house.

Explanation:

Check using the Relative Humidity Table

Answer:

Option B) The relative humidity is higher at Roberta’s house than at Harry’s school.

Explanation:

got 100% on test

Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.

Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.

They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.

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Answer:

pH = 6.20

Explanation:

The pKa of cacodylic acid is 6.

To solve this question we must use Henderson-Hasselbalch equation:

pH = pKa +log [A⁻] / [HA]

Where pKa is the pKa of the weak acid = 6

And [] could be taken as the moles of A⁻ the conjugate base, and HA, the weak acid.

The moles of the NaOH added to the solution of the weak acid are = Moles A⁻

And moles HA = Initial moles HA - Moles NaOH added

Initial moles HA:

0.0200L * (0.130mol / L) = 0.00260 moles

Moles NaOH:

0.0200L * (0.0800mol / L) = 0.00160 moles = [A⁻]

Moles HA =

0.00260 moles - 0.00160 moles = 0.00100 moles = [HA]

pH = 6 +log [0.00160 moles] / [0.00100 moles]

The pH of the resulting solution is 1.6.

Let cacodylic acid be HA, mixing cacodylic acid and NaOH, the following occurs;

HA(aq) + NaOH(aq) ------> NaA(aq) + H2O(l)

Number of moles of NaOH = 0.0800 molL−1 × 20.0/1000 = 0.0016 moles

Number of moles of HA = 20.0/1000  × 0.130 = 0.0026 moles

We can see that the HA is in excess, Number of moles of excess acid =

0.0026 - 0.0016 = 0.001 moles

Total volume of solution = 20.0 mL + 20.0 mL = 40 mL or 0.004 L

Molarity of excess acid =  0.001 moles/0.004 L = 0.025 M

pH = -log[H^+]

pH = -log[0.025 M]

pH = 1.6

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Answer:

protons(positively charged) and the neutrons (no charge)

Explanation:

Answer:

The nucleus of an atom contains protons and neutrons.

Answer:

17 kJ/mol

Explanation:

got it on edge

Answer:

Explanation:

They cannot be separated by distillation since it depends on a liquid's ability to boil at a certain temperature. If you have two liquids with the same boiling temperatures, the proportion of each in the vapor phase will be about equal, making it impossible to separate them. Although they presumably do not have the same freezing point, you might use a different method like chromatography or work with their freezing points instead. You could then selectively crystallize one component while leaving the other as a pure liquid.

____________

Definitions:

Distillation:

#1: The volatilization or evaporation and subsequent condensation of a liquid, as when water is boiled in a retort and then the steam is condensed in a cool receiver.

Answer:

Because different compounds often have different boiling points, the components often separate from a mixture when the mixture is distilled. The boiling point is the temperature at which the vapor pressure of the liquid phase of a compound equals the external pressure acting on the surface of the liquid.

Explanation:

The building blocks of all organic macromolecules contain the element Carbon.

The macro-molecules or the large molecules are formed by the condensation or covalent linking of the smaller molecules.

The macromolecules are composed of the "polymers" formed by the linking of the smaller molecules called "monomers". The monomers in a polymer are made up of same or almost similar molecules linked over again and again through different combinations to form the large macro-molecules. Two types of macromolecules: nucleic acid and protein. Chromosomes are how the DNA is stored so they primarily contain nucleic acids. In addition to properly organize and condense the DNA, proteins are required. These include histones and other proteins.

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Answer:

A student is drinking a cup of hot chocolate as they sit by a campfire on a chilly evening. They know that the cup of hot chocolate transfers thermal energy to the surrounding air. The heated air over their cup of hot chocolate expands and rises and is replaced by cooler, denser air.

This method of energy transfer is

Explanation:

Answer:

radiation

Explanation:

radiation is when an existing heat source spreads heat to its surroundings

As the Earth gets warmer, deserts are expected to increase in size.

As the Earth warms, it is projected that deserts will expand. This is due to the possibility that increased temperatures may lead to greater soil and plant moisture evaporation which could lead to drier conditions and slower plant growth.

Further limiting the amount of water accessible in arid regions is the fact that hotter weather can hasten the evaporation of water from lakes and other sources of surface water.

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