true or false: the first step in the hydrogen burning process is a helium atom fusing with a hydrogen atom.

The coefficient of water in the balanced equation is 7.  Option C is correct.

Balanced chemical equation for the given reaction in acidic solution is;

NH₄⁺(aq) + Cr₂O₇²⁻(aq) + 14H⁺(aq) → Cr³⁺(aq) + N₂(g) + 12H₂O(l)

To balance the equation, we start by balancing the oxygen atoms by adding water molecules to the appropriate side;

NH₄⁺(aq) + Cr₂O₇²⁻(aq) + 14H⁺(aq) → Cr³⁺(aq) + N₂(g) + 7H₂O(l)

Now, we balance the hydrogen atoms by adding H+ ions to the appropriate side;

NH₄⁺(aq) + Cr₂O₇²⁻(aq) + 14H⁺(aq) → Cr³⁺(aq) + N₂(g) + 7H₂O(l)

Finally, we balance the charge by adding electrons to the appropriate side;

NH₄⁺(aq) + Cr₂O₇²⁻(aq) + 14H⁺(aq) → Cr³⁺(aq) + N₂(g) + 7H₂O(l) + 14e⁻

Therefore, the coefficient of water is 7.

Hence, C. is the correct option.

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When H₂S gas is removed from the system at equilibrium, the reaction shifts to the right (products) and the concentration of NH₃ increases (option C)

A French scientist (Chatelier) postulated a principle which helps us to understand a chemical system in equilibrium.

The principle states that If a an external constraint such as change in temperature, pressure or concentration is imposed on a system in equilibrium, the equilibrium will shift so as to neutralize the effect.

According to Chatelier's principle a decrease in concentration of the products will favor the forward (right) reaction.

From the above principle, we can conclude that when H₂S gas is removed from the system at equilibrium, the reaction shifts to the right (products) and the concentration of NH₃ increases.

Thus, the correct answer to the question is option C

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A potential disadvantage of an enzyme having a very high affinity for its substrate, other things being equal, is that the enzyme-substrate complex will be in a deep energy well (option C).

This means that the enzyme-substrate complex will be more stable, which could potentially slow down the rate of the reaction as it takes more energy for the complex to transition to the product state.

Option A is not accurate, as pulling the substrate out of the solution does not necessarily decrease the driving force for the forward reaction.

Option B is also not accurate, as high affinity does not inherently cause spatial distortion of the enzyme.

Option D is incorrect, as tight binding does not necessarily result in a higher energy transition state complex.

Therefore, the correct answer is not E, as not all of the options are accurate.

The most suitable answer is option C: The enzyme-substrate complex will be in a deep energy well, meaning that the enzyme-substrate complex will be more stable.

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Answer:

Cell phones use radio waves to communicate with cell towers, and these waves have wavelengths of approximately 10-1000 m, which are much too large to be ionizing. WiFi actually operates at quite precise frequencies, either 2.4 GHz or 5 GHz, which correspond to wavelengths of either 12 cm or 6 cm.

Explanation:

When the mobile phone is turned on, it emits radio waves that consist of radio frequency (RF) energy—a form of electromagnetic radiation moving at the speed of light. It works by transmitting radio wave signals to (and receiving these from) nearby base stations.

Answer:

A mole is the quantity of a substance that is equal to Avogadro's constant.   The 1.993 moles contain   atoms of sulfur.

Mole :

It is the amount of substance that contains as many elementary entities as in 12 g of Carbon-12. It is equal to the atoms, molecules, or ions.

As mentioned above,

1 mole =

Number of mole formula,

Hence it can conclude that the 1.993 moles contain   atoms of sulfur.

We use Big O notation to describe the upper bound of a function in terms of its input size.

The order of inserting an element into a sorted list of size N implemented using array is O(N).

What is the order of inserting an element into a sorted list of size N implemented using array?

The order of inserting an element into a sorted list of size N implemented using array is O(N).

What is the formula for calculating Big O notation?

The Big O notation formula is O(g(n)) where g(n) is the rate of growth of the function in the equation.

In other words, we use Big O notation to describe the upper bound of a function in terms of its input size.

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When chromium is above iron in the activity cell, to chrome plate a hubcap, a galvanic cell is required. What is a galvanic cell? A galvanic cell, also known as a voltaic cell, is an electrochemical cell that converts the energy released by spontaneous redox reactions into electrical energy.

Galvanic cells have two electrodes: a cathode and an anode, as well as a salt bridge or porous disk that separates the two half-cells. A galvanic cell works on the principle that electrons flow from an electrode with a high reduction potential to an electrode with a low reduction potential, which creates an electric current. The cathode has a negative charge, while the anode has a positive charge. When the anode corrodes, electrons are produced and transferred to the cathode via a wire and a salt bridge. The cathode absorbs electrons, which leads to the reduction of ions. The anode's oxidation releases electrons, which enter the wire and travel to the cathode. Therefore, to chrome plate a hubcap, a galvanic cell is required since chromium is above iron in the activity series, meaning it is more reactive and will displace iron from a solution.

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Answer:

I would recycle, reuse, and reduce the litter on this already hurt Earth.

Explanation:

Answer:

I can go out and help pick up garbage and i can recycle and not litter and i can reuse all the plastic water bottles i drink.

Explanation:

Im glad you care about mother earth to

Carbon dioxide is produced when 5 mL of methane gas interacts.

Methane, a hydrocarbon, is the primary component of natural gas. Methane has an effect on the climate and temperature of the earth because it is a greenhouse gas (GHG). Methane is released into the atmosphere through a variety of natural and anthropogenic (caused by humans) sources.

Methane is non-toxic and safe to breathe in small amounts, but if it is allowed to replace air in large quantities, the absence of oxygen could result in suffocation.

\(CH_{4}(g) + 2O_{2} \rightarrow CO_{2} + 2H_{2}O(g)\)

1 volume of \(CH_{4}\) = 1 volume of \(CO_{2}\)

5 ml of \(CH_{4}\) = 1 × 5 mL CO2

                    = 5 mL CO2

So, volume of methane = 5mL

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Answer:

1. 3

2. 2

3. 4

4. 1

Explanation:

Answer:

8. 1.52 x 10^24 molecules

9. 29206 g

10. 3791.97 g

Explanation:

8. Molecular mass of C14H18N2O5 = 294.3 g/mol

745 g / 294.3 g/mol = 2.53 moles

1 mole has 6.022 x 10^23 molecules

=> 2.53 x 6.022 x 10^23 = 1.52 x 10^24 molecules

9. 1 mole of Fe₂(SO3)3 has 6.022 x 10^23 molecules

so 5 x 10^25/6.022 x 10^23 = 83.0 moles

1 mole of Fe₂(SO3)3 is equal 351.88g

so 83.0 x 351.88 = 29206 g

10. Molar mass of Ba3(PO4)2 is 601.9 g

so 6.3 x 601.9 = 3791.97 g

The combination that will produce a precipitate is AgNO3 (aq) and Ca(C2H3O2)2 (aq). Option B is the correct answer.

When these two solutions are mixed, a double displacement reaction occurs, producing insoluble AgC2H3O2 (silver acetate) and soluble Ca(NO3)2 (calcium nitrate).

The silver acetate will precipitate out of the solution, indicating that a chemical reaction has occurred. The other answer choices do not involve reactions that produce insoluble products and therefore will not produce a precipitate.

This question highlights the importance of understanding double displacement reactions and the solubility rules of different compounds when predicting chemical reactions.

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Answer:

Br

Explanation:

Bromine atoms tend to gain just one electron to get to a full octet, as Bromine is in Group VII.

Answer:

5SiO2 + 2CaC2 ➡ 5Si + 2CaO + 4CO2

Explanation:

This question involves balancing the above equation. An equation is said to be BALANCED when all the atoms of each element in the reactant side equates that in the product side.

According to this question, a chemical reaction is given as follows: SiO2 + CaC2 = Si + CaO + CO2. Based on observation, the atoms of elements are Silicon, oxygen, calcium and carbon are not the same on the reactants and products side. Based on this, the balanced equation is:

5SiO2 + 2CaC2 ➡ 5Si + 2CaO + 4CO2

According to the electronic configuration, elements of group 1,2 and 3 usually form ionic bonds as they have 1,2 and 3 valence electrons.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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The maximum number of electrons in an atom with the given set of quantum numbers, n = 4, l = 2, ml = -2, and s = \(\frac{1}{2}\), is 1 electron.

Here's the step-by-step explanation:

1. The principal quantum number (n) determines the energy level and has a value of 4 in this case. This means that the electron is in the fourth energy level.

2. The azimuthal quantum number (l) defines the subshell and has a value of 2. This corresponds to the d subshell (0 = s, 1 = p, 2 = d, and 3 = f).

3. The magnetic quantum number (ml) specifies the orbital within the subshell and has a value of -2. This indicates one specific d orbital within the d subshell.

4. The spin quantum number (s) represents the electron's spin and has a value of \(\frac{1}{2}\). There are two possible values for the spin quantum number: +\(\frac{1}{2}\) and -\(\frac{1}{2}\). Since we are only considering electrons with s = 1/2, we only count those electrons.

In summary, there is only 1 electron with the specified set of quantum numbers (n = 4, l = 2, ml = -2, and s = \(\frac{1}{2}\)) in an atom.

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Answer:

Molecular Formula is a representation of a compound that what atoms of elements are present in the molecule of a compound. The actual numbers of atoms of each element that occur in the smallest free unit or molecule of the compound is expressed by the molecular formula of the compound. Molecular formulas contain no information about the arrangement of atoms. Because of this, one molecular formula can describe a number of different chemical structures only.

Answer:

1. provide habitats and shelter for many marine organisms 2. Coral reefs protect coastlines from storms and erosion 3. provide jobs for local communities

Explanation:

Answer:

Coral reefs are home to more species of fish and marine invertebrates than any other habitat in the world. Coral reefs protect beaches and shorelines from the impact of waves. Without coral reefs, beaches and shorelines can be severely damaged or washed away. Corals also produce unique chemicals that have potential uses in medicine.

Explanation:

trust me

The density of strontium in kilograms per cubic meter if a 4.00 kg sample has a volume of 0.00152.m³ is calculated as 2631.57 kg/ m³.

Density is generally defined as the mass of material per unit volume. Density is an important concept as it allows us to determine what substances will float and what will sink when placed in a liquid. Generally, substances float as long as their density is less than density of the liquid they are placed in.

Given, mass = 4kg and volume = 0.00152.m³

So, Density of strontium = 4kg/0.00152m³

Density of strontium = 2631.57 kg/ m³

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Answer: C is the definete awnser so yeah its just a lol of REHEHEHEHHEHEHEHEHEHEHEHEHEHEHHEHEHEHEHEHEHEHEHHEHEHEHEHHEHEHEHEHEHEHEHEHHEHEHEHEHEHEHEHEHEHEHEHHE

Grb2 is an α/β protein and plastocyanin is a β protein.

The reason for the above classification is as follows:

(a) Grb2 is classified as an α/β protein because it contains both α-helices and β-sheets in its secondary structure. Grb2 plays a role in signal transduction by binding to other proteins such as receptor tyrosine kinases. It is an adaptor protein that helps with cell communication.

(b) Plastocyanin is classified as a β protein because it primarily contains β-sheets in its secondary structure. Plastocyanin is a copper-containing protein involved in photosynthesis in plants and algae. It is involved in mediating electron-transfer.

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The energy released when adding an electron is the energy released in the atomization reaction. This energy is called electron affinity. The electron affinity of Si is 133.6 KJ/mol.

Electron affinity of an atom is its tendency to capture an electron from other atoms towards its nucleus. The more the electron affinity the more will be its reactivity.

The minimum energy required to remove a loosely bound electron from the valence orbital is called its ionization energy. In the given reaction, silicon is accepting an electron to form its atomic state. Thus, it is releasing the energy.

This energy released during gaining one electron is equal to the electron affinity of silicon that is 133.6 kJ/mol.

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The lewis structure can be drawn as follows: A Carbon atom (C) is at the heart of the CO3(2-). Lewis structure which is obtained is surrounded by three Oxygen atoms (O) around it.

Between each Oxygen atom present in the molecule and the Carbon atom (C), there is presence of two single bonds and one double bonds. (O). On an oxygen atom which has a double bond, there is presence of two lone pairs. On the atom which has a single bond, there is presence of three lone pairs (O). A polyatomic ion which has the formula CO3 is called a carbonate ion (2-).  A carbon oxoanion is considered to be carbonate. It is a hydrogencarbonate's conjugate base. Negativity and the nature of bonds indicates and explains that the oxygen-carbon bond in the CO3(2-) ion is polar in nature. This is achieved as per the Pauling scale.

The dipole moment along the three bonds which is present in a molecule's trigonal planar form, it completely cancels each other out.

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The concentration of this acid in moles per litre : 17.41

Given

99.5% acetic acid

density=ρ=1.05 g/ml

Required

the concentration (mol/L)

Solution

99.5% dan density 1.05 g/ml (MW acetic acid = 60 g/mol)

\(\tt 99.5\%\times 1.05\dfrac{g}{ml}\times \dfrac{1000~ml}{L}=1044.75~g/L\\\\\dfrac{1044.75~g/L}{60~g/mol}=17.41~mol/L\)

The Types of Friction are;

Static Friction is a type of friction that stops objects from moving when a force is added and they aren't moving.

Kinetic friction happens when two things are rubbing against each other while they are moving. It tries to stop things from moving too fast.

Rolling friction happens when something rolls on a surface. Like a wheel moving on the ground. When objects move, it is easier for them to keep going because rolling friction (friction when something rolls) is usually less than kinetic friction (friction when something slides).

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______________________________________

The different types of friction are:

______________________________________

Friction is often called a necessary evil because it can be both helpful and harmful. On the one hand, friction is what allows us to walk, drive, and write, and it prevents objects from slipping and sliding out of our hands. On the other hand, friction can cause wear and tear on machines and vehicles, generate heat that can damage materials, and slow down or stop moving objects.

______________________________________

Friction should be reduced in certain situations to increase efficiency and reduce wear and tear. For example, reducing friction in engines and machines can increase fuel efficiency and decrease maintenance costs. However, friction should not be reduced in situations where it is necessary for safety, such as in car brakes or shoes.

______________________________________

Answer:

It's going to be a postive charge because although theres a lot more neutrons then the rest of them, neutrons are neutral, which won't have much of an effect to the charge of the atom. 4 protons has a larger proportion to the rest.

In Niels Bohr’s model of the atom, electrons are configured in a series of concentric shells around the nucleus. The shells are numbered, with the shell closest to the nucleus being numbered one, and each succeeding shell numbered two, three, and so on.

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The pH change of a 0.270 m solution of citric acid (pKa=4.77) if 0.170 m citrate is added with no change in volume is approximately 0.78.

Citric acid is a weak acid with three dissociable protons. When citrate is added to the solution, it will react with one of the protons of citric acid to form citric acid and citrate anion. This will cause a shift in the equilibrium towards the citrate anion, increasing the pH of the solution. To calculate the pH change, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A⁻]/[HA])

where [A⁻] is the concentration of the citrate anion and [HA] is the concentration of citric acid.

Initially, the concentration of citric acid is 0.270 m and the concentration of citrate is 0 m. Therefore, the pH can be calculated as:

pH = 4.77 + log([0]/[0.270]) = 4.77

After adding 0.170 m of citrate, the concentration of the citrate anion is 0.170 m and the concentration of citric acid is 0.100 m (0.270 - 0.170). Therefore, the pH can be calculated as:

pH = 4.77 + log([0.170]/[0.100]) = 5.55

The pH change can be calculated by subtracting the initial pH from the final pH:

pH change = 5.55 - 4.77 = 0.78

Therefore, the pH change of a 0.270 m solution of citric acid (pKa=4.77) if 0.170 m citrate is added with no change in volume is approximately 0.78.

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Answer:

D

Explanation:

electrons have a negative charge. gaining electrons increases the negative charge.