Hydrogen (H), oxygen (O), and Nitrogen (N) are all examples of which of the following?


all of these are correct


elements


compounds


molecules

Answer:

4

Explanation:

4

Answer:

two H atoms

Explanation:

is the answer I think

t = 57 min., Therefore, we can say that it takes 57 minutes for cyclopropane's partial pressure to drop from 1 atm to 0.125 atm at 500°C.

Propene (CH3CH=CH2) is produced by the isomerization of cyclopropane, which is a first-order process. A sample of cyclopropane converts to propene in 79 minutes at 760 K.

The reaction is a first-order reaction because it is an isomerization reaction, and its rate constant is expressed in terms of minutes. The sum of the powers or exponents that the concentration terms are raised in the rate law expression can be used to define the order of a reaction.

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Answer:

almost everything

Explanation:

Mass is a fundamental property of matter. It is a measure of the amount of matter an object contains or its resistance to acceleration when subjected to an applied force. After 40 years, approximately 48.79 mg of the original 100 mg sample of cesium-137 will remain.

To find the mass that remains after t years for a sample of cesium-137 with a half-life of 30 years, we can use the formula:

\(m(t) = m_{0} * (\frac{1}{2} )^(\frac{t}{T\frac{1}{2} })\)

Where:

m(t) is the mass that remains after t years,

m₀ is the initial mass of the sample,

T₁/₂ is the half-life of cesium-137.

Given:

m₀ = 100 mg (initial mass)

T₁/₂ = 30 years (half-life)

Substituting these values into the formula, we can calculate the mass that remains after t years:

For example, if we want to find the mass that remains after 40 years:

m(40) = 100 mg * (1/2)^(40 / 30)

m(40) ≈ 48.79 mg

So, after 40 years, approximately 48.79 mg of the original 100 mg sample of cesium-137 will remain.

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Answer:

- few nutrients

- low temperatures

-very little sunlight

Explanation:

Answer:

I think it's: located near coasts.

Stirring is only required to dissolve sucrose sugar in water.

What is solubility?

Solubility in chemistry refers to a chemical's capacity to dissolve in another substance, the solvent, to produce a solution. The opposite characteristic, insolubility, refers to the solute's incapacity to create a solution. The solvent is often a solid or a liquid, whereas the solute may be a solid, liquid, or gas. Both could be solution-based compounds or pure chemicals. Except in extremely rare circumstances, gases are always miscible in all ratios, and the only way a solid or liquid may be "dissolved" in a gas is by first becoming gaseous.

Temperature, pressure, and the makeup of the solute and solvent (including their pH and the presence of additional dissolved materials) are the key determinants of solubility.

Hence, stirring is only required to dissolve sucrose sugar in water.

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Answer:

The reactants are the substances that start the chemical reaction. The products are the substances that are produced in the chemical reaction.

Explanation:

What is the difference between reactants and products?

Answer:

See explanation

Explanation:

The principle of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another. Hence, chemical energy in a battery can be converted to electrical energy.

Usually, the conversion of energy from one form to another is not 100% efficient according to the second law of thermodynamics. Some energy is wasted in the process, sometimes as heat.

Hence, in an ideal situation where no heat energy is produced; all the chemical energy is converted to electrical energy (100% energy conversion). There will be no energy loss if no heat is produced.

Answer:

B

Explanation:

Because when you go to the doctors they say, "You need to get your x-rays done" not microwave

Answer:

1) potential energy of the bond.

2) Linear

3) The electrons are transferred from K to Cl.

4) ClF

5) Oxygen

6) Electrolysis

7) Double displacement

Explanation:

As two atoms approach each other in a bonding situation, the potential energy of the bond is minimized as the internuclear distance of the bonding atoms decreases.

BeH2 has two electron domains and the central beryllium atom is sp2 hybridized. According to valence shell electron pair repulsion theory. A molecule having two regions of electron density will lead to a linear molecule.

KCl is an ionic compound hence there is a transfer of electrons from K(metal) to Cl(nonmetal).

ClF has partial charges because it contains a polar covalent bond. The partial charges arise from the dipole within the molecule. LiF is a pure ionic compound formed by transfer of electrons from Li to F. The species possess full and not partial charges.

When an oxygen atom bonds with another oxygen atom, what has been formed is a homonuclear covalent bond. Since the electro negativity of the both atoms is exactly the same, a pure covalent bond is formed. Recall that polar covalent bonds are formed when there is a significant electro negativity difference between the bonding atoms.

When direct current is passed through certain salt solutions during electrolysis, gases may be evolved and collected at the appropriate electrodes.

A double-replacement reaction is a reaction in which the cations and anions present in two different ionic compounds that are reacting together exchange their positions to form two new compounds on the product side. For instance, look at the reaction shown in question 7 as a typical example of this;

AgNO3 (s) + NaCl (s) → AgCl (s) + NaNO3 (s).

The correct answer is C. -0.76 V. the potential for this reduction half-reaction is -0.76 V relative to the standard hydrogen electrode.

The correct answer is C. -0.76 V.

The standard reduction potential, denoted as E°, is a measure of the tendency of a species to gain electrons and undergo reduction in a redox reaction. It is expressed in volts (V) and represents the potential difference between the reduction half-reaction and the standard hydrogen electrode (SHE), which is assigned a potential of 0 V.

In the given half-reaction:

Mg2+(aq) + 2e- → Mg(s)

The species undergoing reduction is Mg2+(aq), and it is being reduced to Mg(s) by gaining 2 electrons.

To find the standard reduction potential for this half-reaction, we can refer to standard reduction potential tables. These tables provide a reference for various half-reactions with respect to the standard hydrogen electrode.

In the table, the standard reduction potential for the Mg2+(aq) + 2e- → Mg(s) half-reaction is listed as -0.76 V. This means that Mg2+ has a tendency to be reduced, and the potential for this reduction half-reaction is -0.76 V relative to the standard hydrogen electrode.

Therefore, the correct answer is C. -0.76 V.

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The experiment involves observing the color changes of various substances in the presence of a china rose indicator to determine their acidic or basic nature. The neutralization process can also be observed by mixing an acid and a base and noting the resulting color change.

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b. increase in surface area

Given

Speeding up a chemical reaction

Required

Factors used to speed up reactions

Solution

There are several factors that influence reaction kinetics :  

1. Concentration  

2. Surface area  

3. Temperature  

4. Catalyst  

5. Pressure  

6. Stirring  

Temperature is related to the kinetic energy of the particles. Heat is absorbed causes the particles of matter to move faster so that the reaction can take place faster

The enlarged surface area of the reactants causes more particles to react with other particles.

50 g square block of sulfur can be broken into small pieces or powdered so that more particles come into contact with each other

Answer: Ionic attractions

Explanation:

Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions.

The mass of magnesium in the sample is 48.5 grams (Option B).

To determine the mass of magnesium in the sample, we need to subtract the mass of chlorine from the total mass of the sample.

Given:

Total mass of the sample = 190.2 grams

Percentage of chlorine by mass = 74.5%

To calculate the mass of chlorine, we can use the percentage composition formula:

Mass of chlorine = (Percentage of chlorine / 100) * Total mass of the sample

Mass of chlorine = (74.5 / 100) * 190.2

Mass of chlorine = 0.745 * 190.2

Mass of chlorine = 141.639 grams

Since the sample contains only magnesium and chlorine, we can determine the mass of magnesium by subtracting the mass of chlorine from the total mass of the sample:

Mass of magnesium = Total mass of the sample - Mass of chlorine

Mass of magnesium = 190.2 - 141.639

Mass of magnesium = 48.561 grams

Rounding the mass of magnesium to one decimal place, we get 48.5 grams.

The mass of magnesium in the sample is 48.5 grams (Option B).

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Answer:

B. Intermolecular forces are hard to overcome

Explanation:

A high boiling point indicates greater inter molecular forces between the molecules of the substance. Inter molecular forces is the force of attraction between the molecules of the substance, which has to be overcome or broken before the substance boils. Example, when water boils, the water molecule (H₂O) will be broken into hydrogen molecule and oxygen molecule.

Therefore, a high boiling point temperature indicates that intermolecular forces of the substance are hard to overcome.

B. Intermolecular forces are hard to overcome

Answer:

b

Explanation:

The helix that forms in a protein chain as a result of hydrogen bonds is its secondary structure.

Protein is an essential nutrient for the human body. [1] They are one of the building blocks of body tissue and also serve as a fuel source. As a fuel, proteins provide energy density similar to that of carbohydrates. 4 kcal (17 kJ) per gram. In contrast, lipids provide 9 kcal (37 kJ) per gram. From a nutritional point of view, the most important aspect and defining characteristic of a protein is its amino acid composition.

Proteins are polymeric chains of amino acids held together by peptide bonds. During human digestion, stomach proteins are broken down into smaller polypeptide chains by the action of hydrochloric acid and proteases. It is essential for the absorption of essential amino acids that cannot be biosynthesized by the body.

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Answer: I think you're supposed to add the protons and neutrons and then that's your answer. Sorry if I'm wrong :/

Explanation:

The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.

One example of two organisms and their adaptations are the polar bear and the arctic fox, both of which inhabit the harsh, icy environment of the Arctic.

The polar bear has a thick layer of insulating fur, which helps it retain body heat in the cold temperatures. It also has large paws that act like snowshoes, allowing it to move over snow and ice more easily.

The polar bear's sense of smell is also highly developed, allowing it to detect prey from far distances. These adaptations help the polar bear survive in its cold, snowy habitat by keeping it warm and aiding in its ability to hunt for food.

The arctic fox also has several adaptations that allow it to survive in the Arctic. Its fur changes color from brown in the summer to white in the winter, providing camouflage against the snow. The fox's paws are covered in fur to provide insulation and better traction on the slippery ice.

The fox's diet is also highly adaptable, allowing it to survive on a variety of prey, from lemmings to birds to fish. These adaptations help the arctic fox survive in the harsh Arctic environment by helping it blend in, move more efficiently, and find food.

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Answer:

The catalytic mechanism of glucokinase (GK) is still not fully understood, but it is thought to involve the following steps:

Glucose binds to GK in a specific pocket.

ATP binds to GK in a different pocket.

The two substrates are brought close together by GK.

A general acid-base catalyst in GK deprotonates the C6 hydroxyl group of glucose.

A nucleophilic attack by the C6-hydroxyl group of glucose on the α-phosphate of ATP takes place.

The reaction is completed by the release of ADP and glucose-6-phosphate.

GK is a very efficient catalyst, and it is thought that its efficiency is due to the following factors:

The specific binding of the substrates to GK creates a favorable orientation for the reaction to take place.

The presence of a general acid-base catalyst in GK speeds up the reaction by providing a proton to protonate the C6 hydroxyl group of glucose and a base to abstract a proton from the α-phosphate of ATP.

The close proximity of the substrates in GK allows the reaction to take place more easily.

GK is an important enzyme in the regulation of glucose homeostasis. It is the rate-limiting enzyme in the hepatic phosphorylation of glucose, and it plays a role in the regulation of insulin secretion.

Explanation:

54.0g Al reacts with 64.0g O2 to form Al2O3 according to the equation. 136 grams of Al2O3 form from 64.0 g O2.

The term molar mass is defined as the the ratio between the mass and the amount of substance of any sample of that compound. The molar mass is denoted by the symbol "M".

M = m / n

Molar Mass of O₂ is 32 g/mol

Molar Mass is Al₂O₃ is 102 g/mol

4 Al + 3 O₂ ⇒ 2 Al₂O₃

64.0 g O₂           1 mole           2 moles Al₂O₃            102 g

-----------------  x  --------------  x  ------------------------  x   -------------  

                            32 g               3 moles O₂             1 mole

=  136 g Al₂O₃

Thus,54.0g Al reacts with 64.0g O2 to form Al2O3 according to the equation. 136 grams of Al2O3 form from 64.0 g O2.

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Answer:

a) potassium hydroxide

Explanation:

Potassium Hydroxide is a type of lye specifically used to make liquid soap.

Sodium hydroxide(lye) is used to unclog drains.

Hope this helps plz hit the crown :D

d. Organic compounds can have oxygen, sulfur, and nitrogen along with carbon and hydrogen.

Organic compounds are a broad class of chemical compounds that primarily consist of carbon and hydrogen atoms. However, they can also contain other elements such as oxygen, sulfur, and nitrogen. These elements often form functional groups that contribute to the properties and reactivity of organic compounds. Oxygen can be present in compounds like alcohols, ethers, and carbonyl compounds. Sulfur is commonly found in organic compounds like thiols and sulfides. Nitrogen is a key component in amines, amides, and many other organic nitrogen-containing compounds. Organic compounds are not exclusive to living organisms and can be found in both natural and synthetic sources.

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Answer:

B. it is a community of plants,animals and there physical surrounding.

Answer:

Because burning a non-renewable resource that is not good for the atmosphere, will always cause some kind of chemical reaction to happen.

Examples of these reactions are...

When enzyme a was run with 40 μM substrate, the initial rate (\(v_{0}\)) was 10 μM/min, and when it was run with 4 mM substrate, the \(v_{0}\) was 20 μM/min. The approximate (\(V_{max}\) is 20 μM/min, and the approximate \(K_{m}\)  is 40.8 μM.

To estimate the approximate \(V_{max}\) and \(K_{m}\)  of enzyme A, we can use the Michaelis-Menten equation, which describes the relationship between the initial reaction rate (\(v_{0}\)), the maximum reaction rate (\(V_{max}\) ), and the substrate concentration (S):

\(v_{0}\) = (\(V_{max}\) * S) / (\(K_{m}\) + S)

For 40 μM substrate:

\(v_{0}\) = 10 μM/min

S = 40 μM

For 4 mM substrate:

\(v_{0}\) = 20 μM/min

S = 4 mM = 4000 μM

Using the Michaelis-Menten equation:

\(v_{0}\) = (\(V_{max}\)* S) / (\(K_{m}\) + S)

Let's set up the equations using the given data points:

10 = (\(V_{max}\) * 40) / (\(K_{m}\) + 40)

20 = (\(V_{max}\) * 4000) / (\(K_{m}\) + 4000)

We can simplify these equations and solve them simultaneously:

Equation 1: 10(\(K_{m}\) + 40) = 40\(V_{max}\)

Equation 2: 20(\(K_{m}\) + 4000) = 4000\(V_{max}\)

Divide Equation 2 by Equation 1:

2(\(K_{m}\) + 4000) / (\(K_{m}\) + 40) = 100

Expanding and simplifying:

2\(K_{m}\) + 8000 = 100\(K_{m}\) + 4000

98\(K_{m}\) = 4000 - 8000

98\(K_{m}\) = -4000

\(K_{m}\) = -4000 / 98

\(K_{m}\) ≈ 40.8 μM (Approximate \(K_{m}\) value)

Substituting the value of \(K_{m}\) into Equation 1:

10 = (\(V_{max}\) * 40) / (40.8 + 40)

10 = (\(V_{max}\) * 40) / 80.8

\(V_{max}\) = (10 * 80.8) / 40

\(V_{max}\) ≈ 20 μM/min (Approximate \(V_{max}\) value)

Therefore, the approximate (\(V_{max}\) is 20 μM/min, and the approximate \(K_{m}\)  is 40.8 μM.

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The chemical reaction between benzoic acid (C₆H₅COOH) and NaOH can be represented as C₆H₅COOH + NaOH → C₆H₅COONa + H₂O.

This reaction involves the displacement of the hydrogen atom from the carboxylic acid group in benzoic acid by the sodium atom from sodium hydroxide. As a result, sodium benzoate (C₆H₅COONa) and water (H₂O) are formed.

The reaction between benzoic acid and NaOH is classified as an acid-base reaction, where the acidic benzoic acid reacts with the basic NaOH to produce a salt (sodium benzoate) and water.

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Answer:

80 hours. 2,000 ÷ 25 = 80

Answer:

2.08 L

Explanation:

\(V_{2} = V_{1}\) \((\frac{P_{2} }{P_{1} })\)

= 2.50L × \((\frac{1.25 atm}{1.5 atm} )\)

=2.08L