Addition of functional groups such as a methyl group, a phosphate group, or a hydroxyl group can change the conformation of a protein, which could affect its function or level of activity. a.) Trimming of polypeptide chains b.) Removal and/or modification of the N-terminal amino acid c.) Modification of individual amino acids d.) Attachment of carbohydrate side chains

Answer:

2 moles of sugar in 1,000g of water

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:

1.

a. 1.2   x 10^−4 mm

b. 5.6  x 10^5  cm

c. 3.34 x 10^4  kg

d. 4.12  x 10^-4 s

2.

a. 70.5 g

b. 40.0005

c. 23500

Explanation:

The following measurements in scientific notation are:

 a. 0.000 12 mm = 1.2 × 10⁻⁴mm

 b. 560000 cm  = 5.6 × 10⁵  cm

 c. 33400 kg   =  3.34 × 10⁴ kg

 d. 0.0004120 = 4.12 × 10⁻⁴ s

The following measurements are in scientific notation, by writing them in ordinary notation, we have:

 a 7.050 × 10 = 70.50 g

 b. 4.00005 × 10 = 40.0005 mg

 c. 2.3500 × 10⁴ mL = 23500 mL

Scientific notation is a better method of writing and expressing a large number in smaller acceptable ways. This is done by counting the decimal place before the real numbers and multiplying it to their power of 10.

In the first case, we count the position of the real numbers and raise it to the power of 10.

So, counting from the front part to the back takes a negative power and vice versa. (i.e counting from the back to the front takes a positive power).

 a. 0.000 12 mm = 1.2 × 10⁻⁴mm

 b. 560000 cm  = 5.6 × 10⁵  cm

 c. 33400 kg   =  3.34 × 10⁴ kg

 d. 0.0004120 = 4.12 × 10⁻⁴ s

An ordinary notation is an ideal method of writing scientific notations back to their normal ordinary ways. From the given information, the scientific notation can be written in ordinary ways as follows:

 a 7.050 × 10 = 70.50 g

 b. 4.00005 × 10 = 40.0005 mg

 c. 2.3500 × 10⁴ mL = 23500 mL

Therefore, we can conclude that we clearly understood the difference between scientific notation and ordinary notation and how to compute figures in either scientific notation and ordinary notation.

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Answer:

please mark as brainliest

Explanation:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons . The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

example:chlorine is an example of an isotope it has a proton number of 17 and a mass number of 35 in some cases they have a proton number of 17 and a mass number of 37 there is difference in the number of neutron to calculate this we do it this way.for the first one

mass number=proton+neutron

neutron=mass number-proton

neutron=35-17

neutron=18

for the second one

neutron=37-17

neutron=20

The symbol is the correct notation for the element silicon is Si. The atomic number of the silicon is 14. The correct option is a , b.

The silicon is a metalloid, that means it has properties of both the metals and the nonmetals. The Silicon is the second most abundant element on the Earth, after the oxygen, and it is the major component of the rocks, sand, and the minerals.

The Silicon has the crystalline structure and is vey hard, brittle, and the  blue-grey material. The silicon is not found in the pure form in the nature.

The atomic number of the silicon is 14. The symbol of the silicon is Si. Therefore, the a, b is correct option.

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The solubility-product constant for each of the following substances, given that the molar concentrations of their saturated solutions are as indicated: (a) AgSeCN = 4.0 × 10-16, (b) RaSO4 = 8.6 × 10-11, (c) Pb(BrO3)2 = 1.5 × 10-4, (d) Ce(IO3)3 = 9.5 × 10-10

As given,

AgSeCN is dissociating into Ag+ and SeCN- ions, and the solubility product constant of AgSeCN is Ksp.

The given concentration is 2.0 × 10-8 M.

AgSeCN ⇌ Ag+ + SeCN-Ksp = [Ag+] [SeCN-]Ksp = (2.0 × 10-8) (2.0 × 10-8)Ksp = 4.0 × 10-16B) RaSO4 is dissociating into Ra2+ and SO42- ions, and the solubility product constant of RaSO4 is Ksp.

The given concentration is 6.6 × 10-6 M.

RaSO4 ⇌ Ra2+ + SO42-Ksp = [Ra2+] [SO42-]Ksp = (6.6 × 10-6)2Ksp = 8.6 × 10-11C) Pb(BrO3)2 is dissociating into Pb2+ and BrO32- ions, and the solubility product constant of Pb(BrO3)2 is Ksp.

The given concentration is 1.7 × 10-1 M.

Pb(BrO3)2 ⇌ Pb2+ + 2 BrO32-Ksp = [Pb2+] [BrO32-]2Ksp = (1.7 × 10-1) (2 × 1.7 × 10-1)2Ksp = 1.5 × 10-4D) Ce(IO3)3 is dissociating into Ce3+ and 3 IO3- ions, and the solubility product constant of Ce(IO3)3 is Ksp.

The given concentration is 1.9 × 10-3 M.

Ce(IO3)3 ⇌ Ce3+ + 3 IO3-Ksp = [Ce3+] [IO3-]3Ksp = (1.9 × 10-3) (3 × 1.9 × 10-3)3Ksp = 9.5 × 10-10

Thus, given that the molar concentrations of their saturated solutions, the solubility-product constant for each of the following substances, are as indicated:

(a) AgSeCN = 4.0 × 10-16

(b) RaSO4 = 8.6 × 10-11

(c) Pb(BrO3)2 = 1.5 × 10-4

(d) Ce(IO3)3 = 9.5 × 10-10

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Answer:

Niels Bohr

Explanation:

The sample prepared by dissolving 10.0 grams of NaCl in 1.0 liter of H₂O is a homogeneous mixture, which is described by option (2).

A homogeneous mixture is a mixture that has a uniform composition and properties throughout the sample. In this case, the NaCl molecules have been completely dissolved in the water molecules, resulting in a clear, colorless solution.

The NaCl and water molecules are distributed evenly throughout the sample, and the composition and properties of the solution are uniform in all parts of the sample. As a result, the sample is a homogeneous mixture.

Option (1) cannot be correct because NaCl and H₂O are two distinct compounds that have different properties and characteristics. Therefore, they cannot form a single homogeneous compound.

Option (3) cannot be correct because a compound is a substance composed of two or more different elements that are chemically combined in a fixed ratio. NaCl is a compound, but H₂O is also a compound, and they cannot chemically combine to form a heterogeneous compound.

Option (4) cannot be correct because a heterogeneous mixture is a mixture that is not uniform in composition and properties throughout the sample. This is not the case for the NaCl and H₂O solution, which is a homogeneous mixture.

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Answer:

1.)3.33045

2.)0.02550535714

3.)53.21

4.)26.56

5.)6.72672

6.)3.351

7.)843750

8.)227376.25

9.)0.00172776

10.)8.9577346e+33

Explanation:

The new pressure of a nitrogen gas at STP is 0.021atm.

The pressure of a gas can be calculated by using the combined gas law equation as follows:

P₁V₁/T₁ = P₂V₂/T₂

Where;

At STP, a gas has the following:

0.073 × 1/273 = 4.53 × P/353

0.0002674 × 353 = 4.53P

P = 0.021atm

Therefore, 0.021atm is the pressure of the nitrogen gas.

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The new pressure of the gas would be  0.0208 atm.

According to the general gas law, the ratio of the product of the pressure and volume to its temperature is constant.

The general gas law is summarily expressed as the following equation:

\(p_1v_1/t_1\) = \(p_2v_2/t_2\). where:

\(p_1\) = initial pressure of a gas

\(v_1\) = initial volume of the gas

\(t_1\) = initial temperature of the gas

\(p_2\) = final pressure of the gas

\(v_2\) = final volume of the gas

\(t_2\) = final temperature of the gas

In this case:

\(p_1\) = standard pressure = 1 atm

\(v_1\) = 73 mL or 0.073 L

\(t_1\) = standard temperature = 273 K

\(p_2\) = ?

\(v_2\) = 4.53 L

\(t_2\) = 80 + 273 = 353 K

\(p_2\) = \(p_1v_1t_2/t_1v_2\)

   = 1x0.073x353/273x4.53

   = 25.769/1236.69

    = 0.0208 atm

Thus, the new pressure of 73.0 mL nitrogen that was heated to a volume of 4.53 L at STP is 0.0208 atm.

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Thee correct composition of a neutral atom of helium-4 is to consists two protons and two neutrons.

Helium-4 is a stable isotope of the element helium. It is by far the most abundant of her two naturally occurring isotopes of helium, accounting for about 99.99986% of the helium on Earth. Its nucleus is the same as an alpha particle, consisting of two protons and two neutrons. The atomic number of helium is 2. The 4 after the element name indicates the mass number of the helium 4 atom, and the neutral atom always has a number equal to the total number of protons and neutrons in its nucleus. Helium 4 atoms without electrons are alpha particles. Alpha particles are emitted from unstable nuclei.

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The statements wrong about cathode rays is none of the given option. All the given option is true about the cathode rays.

The statements for the cathode rays is given as :

A. They travel in straight lines towards cathode. This statement is true about the cathode rays.

B. They produce heating effect. This statement is true about the cathode rays.

C. They carry negative charge. This statement is true about the cathode rays.

D. They produce X-rays when strike with material having high atomic masses. This statement is true about the cathode rays.

Thus, none of the option is incorrect about the cathode rays.

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F- blocks elements are called inner transition metals. It occupies a position between the elements lanthanum and hafnium and between actinium and rutherfordium.

In the Periodic table, the inner transition elements are sometimes called the f-block elements since in this region the f-orbitals are being filled in. The elements constituting the f-block or inner transition metals are those in which 4f and 5f orbitals are progressively filled. These elements are the members of group 3 but shown separately as f-block of the periodic table. The elements of f-block are called inner transition elements. There are 28 inner transition elements in the periodic table. The inner transition elements are two series of elements known as the lanthanoids and actinoids.

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The % concentration of vitamin C in the 250 ml sample of orange juice is 0.03%.

To calculate the % concentration of vitamin C, we need to divide the mass of vitamin C by the volume of the sample and multiply by 100. In this case, the mass of vitamin C is given as 75 mg. Since 1 ml is equal to 1 gram, we can convert the volume of the sample from ml to grams by dividing it by 1000. So, 250 ml is equal to 250/1000 = 0.25 g. Now we can calculate the % concentration using the formula:

% concentration = (mass of vitamin C / volume of sample) * 100

= (75 mg / 0.25 g) * 100

= 30%

The % concentration of vitamin C in the 250 ml sample of orange juice is 0.03%.

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IUPAC is the nomenclature approach used for naming compounds. The compounds are ethane, butane, and butene.

IUPAC is the nomenclature method of the organic compounds that are universal and is recommended by the International union so that the names of the same chemical species are constant and ubiquitous all over.

The first compound has a single bond and two carbons hence ethane, the second compound has a single bond and four carbons and hence butane, and the third compound has one double bond and four carbon atoms and hence butene.

Therefore, the compounds are ethane, butane, and butene.

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The chemical reaction taking place to let the meat be tenderized when it is soaked in lemon juice or vinegar is called denaturation.

Denaturation is a process where the protein structure of the meat changes due to the acidity of the lemon juice or vinegar. The acidity breaks down the proteins, making the meat more tender. This is why meat is often soaked in an acidic liquid such as lemon juice or vinegar to tenderize it.

Meat is left tenderized by soaking in a liquid like lemon juice or vinegar for several hours because the acid in the vinegar or lemon juice breaks down the proteins in the meat. The acidity breaks down the proteins, making the meat more tender and easier to chew. Vinegar and lemon juice work so well to tenderize meat because they contain acid. Denaturation is the process by which proteins are altered due to changes in pH, temperature, or other conditions. When meat is soaked in vinegar or lemon juice, the acid denatures the proteins in the meat, making it more tender.

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Answer:

the basic unit of an ionic compound is called a formula unit and the basic unit of a covalent compound is a molecule.

Answer:

The answer should be krypton Im doing the test rn.

Explanation:

The most reactive element in period 4 which is shiny and forms a +1 cation is potassium.

The periodic table is defined as an arrangement of elements in groups and periods. The elements in the same group have similar properties while the elements in the same period has the same number of shells.

The element in period 4 that is shiny, forms a cation of +1 charge and is the most reactive in period 4 is the element potassium.

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Answer:

C5H6O3

Explanation:

Number of moles of hydrogen = 0.142 * 2 /18  = 0.0158 moles of H

Number of moles of carbon = 0.579 * 1/44 = 0.013 moles of C

Mass of C = 0.013 moles of C * 12 = 0.156 g

Mass of H = 0.0158 moles of H * 1 = 0.0158 g

Mass of oxygen = 0.3000 - (0.156  + 0.0158 )

Mass of oxygen = 0.1282 g

Number of moles of oxygen =  0.1282 g/16 g/mol = 0.008 moles of O

Dividing through by the lowest number of moles

C-0.013/0.008 , H- 0.0158 /0.008 ,  O- 0.008/0.008

1.625,  1.975, 1 (multiply through by 3)

5,          6,      3

The required empirical formula is C5H6O3

Answer:

3.96 × 10⁻³ mol Pb

Explanation:

Step 1: Find molar mass

Pb (Lead) - 207.2 g/mol

Step 2: Use Dimensional Analysis

\(0.821 \hspace{2} g \hspace{2} Pb(\frac{1 \hspace{2} mol \hspace{2} Pb}{207.2 \hspace{2} g \hspace{2} Pb} )\) = 0.003962 mol Pb

Step 3: Simplify

We have 3 sig figs

0.003962 mol Pb ≈ 0.00396 mol Pb

0.00396 mol Pb = 3.96 × 10⁻³ mol Pb

The Chlorine and fluorine atoms are  the most electronegative.

So, option D and E is correct one.

The atom of a given chemical elements having tendency to attract bonded pair of electron toward itself is called electronegativity. The electronegativity of atoms is affected by both its atomic number and distance at which its valence electrons resides from the charged nucleus.

The electronegativity of the elements is increases on moving left to right in the period of periodic table while decreasing on moving top to bottom in the group of periodic table .

Example:

The elctronegativity of fluorine atom = 3.98

The elctronegativity of chlorine atom =3.16

The elctronegativity of carbon atom = 2.25

The elctronegativity of phosphorus atom = 2.19

The elctronegativity of silicon atom = 2.58

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Based on the given terms, here's an analysis of the statements about covalent Lewis structures for neutral molecules: Hydrogen atoms are often the central atom of a Lewis structure. - False. Hydrogen atoms are typically terminal atoms because they can only form one bond.

a. Each atom of a Lewis structure must have eight electrons. - False. This statement is not true for all atoms. It is true for elements following the octet rule, but hydrogen only needs two electrons to achieve a full outer shell, and some elements can have expanded octets.

b. For a neutral molecule, the number of electrons in the Lewis structure is the sum of the valence electrons for the atoms. - True. In a neutral molecule, the Lewis structure represents the distribution of valence electrons among the atoms, and the total number of electrons in the structure equals the sum of the valence electrons for each atom.

c. Electrons of covalent compounds may be shared between atoms. - True. In covalent compounds, electrons are shared between atoms to form covalent bonds, resulting in the stability of the molecule.

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Answer:

is it fall and winter................

Explanation:

Answer:

OA. YESS

Explanation:

They will because they are all over America.

The base will first cause one of the OH groups to deprotonate before the nucleophile (O⁻) attacks the epichlorohydrin.

Manufacturers use the chemical sodium hydroxide to create products including soap, viscose, paper, explosives, pigments, and petroleum. Other applications for sodium hydroxide include the processing of cotton fibers, metal cleansing and treatment, oxidation coating, plated, and electrochemical extract.

A) The base will first cause one of the OH groups to deprotonate before the nucleophile (O⁻) attacks the epichlorohydrin.

B)The second OH group will once more deprotonate, and the H2 molecule will likewise be eliminated from the epichlorohydrin. Then, the nucleophile (O⁻) will attack the carbocation internally.

C)Alkyl halide hydrolysis produces primary alcohol.

D) Following another round of dehydrolysis, piperidine and carbocation react to produce piperoxan.

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Answer:

Helium

He

atomic number 2.

It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas,

Explanation:

These different types of helium atoms have different masses (3 or 4 atomic mass units ), and they are called isotopes. For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit (amu). By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom. All elements exist as a collection of isotopes. The word ‘isotope’ comes from the Greek ‘isos’ (meaning ‘same’) and ‘topes’ (meaning ‘place’) because the elements can occupy the same place on the periodic table while being different in subatomic construction.

1 day = 1440 minutes

2 days = 2880 minutes

2 days = 62 words per minute× 2880 minutes

2 days = 178560 words

Therefore she can type 178560 words in 2 days if she can type at 62 words per minutes

The masses of the solutions are; 0.34 g, 0.95 g and 2.9 g respectively.

We know that in the process of electrolysis, it is possible that we can be able to deposit a given mass of the metal when we pass a direct current through the solution.

We then have;

Quantity of current passed through each solution = 100 * 10^-3 A * 4 * 60 * 60 = 1440 C

Solution 1;

23 g of sodium is deposited by 96500 C

x is deposited by 1440 C

x = 0.34 g

Solution 2

63.5 g is deposited by 96500 C

x is deposited by 1440 C

x = 0.95 g

Solution 3;

197 g is deposited by 96500

x is deposited by 1440 C

x = 2.9 g

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In order to produce 2.3 moles of carbon dioxide (CO₂), you would need to consume 7.9 moles of glucose. This is because in the chemical equation for respiration, glucose reacts with oxygen to form carbon dioxide and water: C6H12O6 + 6O2 → 6CO2 + 6H2O.

A converging lens made from a transparent plastic bottle filled with water is used to enable Pak Dollah read the newspaper.

Long-sightedness is an eye effect in which objects are not able to focus on the retina but behind the retina, therefore, near objects are not clearly seen except they are placed far away.

To correct long-sightedness, a suitable converging lens is used to bring the image to focus on the retina.

To construct a converging lens for Pak Dollah, the transparent plastic bottle is filled with water to serve as a converging lens and Pal Dollah will read through it.

Therefore, a converging lens made from a transparent plastic bottle filled with water is used to enable Pak Dollah read the newspaper.

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