The chemical combination of two or more different atoms in fixed amounts is called a(n)
A. element
B. mixture.
C. orbit
D. compound.




















​

Explanation:

2 9 10 7 1 10_20 20_30 30_40 40_ 50 50_60

While both double replacement reactions and combustion reactions involve the breaking and forming of chemical bonds, there are some differences between them in terms of the products that are formed. One thing that can happen in a double replacement reaction but not in a combustion reaction is the formation of a precipitate, which is a solid that forms when two solutions are mixed together and a reaction occurs.

Chemical reactions can be broadly classified into several types based on the nature of the reactants and products involved. Two common types of chemical reactions are double replacement reactions and combustion reactions. While both of these reactions involve the breaking and forming of chemical bonds, there are some differences between them in terms of the products that are formed.

A double replacement reaction is a type of chemical reaction where the cations and anions of two ionic compounds switch places to form two new ionic compounds. This type of reaction is also known as a metathesis reaction. The general equation for a double replacement reaction is:

AB + CD → AD + CB

In this reaction, the reactants AB and CD switch their respective cations and anions to form the products AD and CB. For example, a double replacement reaction between silver nitrate (\(AgNO_{3}\)) and sodium chloride (NaCl) can be represented as:

\(AgNO_{3}\) + NaCl → AgCl + \(NaNO_{3}\)

In this reaction, the silver ion (Ag+) from silver nitrate combines with the chloride ion (Cl-) from sodium chloride to form silver chloride (AgCl), while the sodium ion (Na+) from sodium chloride combines with the nitrate ion (\(NO_{3}\)) from silver nitrate to form sodium nitrate (\(NaNO_{3}\)).

On the other hand, a combustion reaction is a type of chemical reaction where a fuel and an oxidant react to produce heat and light. The general equation for a combustion reaction is:

Fuel + Oxidant → Heat + Light

For example, the combustion of methane (\(CH_{4}\)) in the presence of oxygen (\(O_{2}\)) can be represented as:

\(CH_{4}\) + \(2O_{2}\) → \(CO_{2}\) +\(2H_{2} O\) + Heat + Light

In this reaction, methane (the fuel) combines with oxygen (the oxidant) to produce carbon dioxide (\(CO_{2}\)) and water (\(H_{2} O\)), along with heat and light.

One thing that can happen in a double replacement reaction but not in a combustion reaction is the formation of a precipitate. A precipitate is a solid that forms when two solutions are mixed together and a reaction occurs. In a double replacement reaction, the reactants are typically two aqueous solutions of ionic compounds, which means that the products are also typically aqueous solutions of ionic compounds. However, sometimes the products can be insoluble in water, which means they will form a solid and settle out of the solution. This solid is called a precipitate.

In the example double replacement reaction between silver nitrate and sodium chloride mentioned earlier, the product silver chloride is insoluble in water and will form a precipitate. This means that if the reaction is carried out in a test tube or other container, the precipitate will be visible as a cloudy or milky substance that settles to the bottom of the container.

In a combustion reaction, the reactants are typically a fuel and an oxidant, which means that the products are typically gases or liquids. There is generally no formation of precipitates in a combustion reaction because there are no ionic compounds present that can form insoluble products.

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The child needs 1,569.25 mg of amoxicillin per day, with 784.63 mg of amoxicillin per dose.

Streptococcus infections are commonly treated with amoxicillin, a broad-spectrum antibiotic.

Amoxicillin is effective against many different types of bacteria, including Streptococcus bacteria.

When a child has a streptococcus infection, amoxicillin may be prescribed at a dosage of 45 mg per kg of body weight per day given b.i.d.

In this case, a 76.8 lb child would be given 1,385.28 mg of amoxicillin per day, divided into two equal doses, for a total of 692.64 mg per dose.

Amoxicillin is a penicillin antibiotic used to treat infections caused by bacteria.

It is effective against many different types of bacteria, including streptococcus bacteria.

The required dosage of amoxicillin for a child is determined by their body weight and the extent of the infection they are experiencing.

In this case, the child weighs 76.8 lbs, which is equivalent to 34.85 kg.

The dosage of amoxicillin is 45 mg per kg of body weight per day, so the child needs 1,569.25 mg of amoxicillin per day.

This dosage is divided into two equal doses, so the child needs 784.63 mg of amoxicillin per dose.

Since amoxicillin is often taken orally, this dosage can be provided in the form of a tablet, suspension, or chewable tablet.

The duration of amoxicillin treatment will depend on the severity of the infection and the response of the child to the treatment. Generally, amoxicillin treatment lasts for 10 to 14 days.

The child should continue taking amoxicillin for the full prescribed course, even if they start feeling better before the treatment is completed.

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The chemical energy referred to in the transfer from producers to consumers is the energy stored in the organic molecules synthesized by the producers during photosynthesis.

Producers, such as plants and algae, use energy from sunlight to convert carbon dioxide and water into glucose and other organic molecules through the process of photosynthesis. The energy from the sunlight is converted into chemical energy and stored in the organic molecules.

Consumers, such as herbivores and carnivores, obtain this stored chemical energy by consuming the organic molecules synthesized by the producers. The organic molecules are broken down during cellular respiration to release the stored chemical energy, which is used by the consumer to power its cellular processes.

Thus, the transfer of chemical energy from producers to consumers is a fundamental process in the food chain, and it is essential for the maintenance of life on earth.

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Nitrous acid, HNO2, is a weak acid, which can be represented as follows:

HNO2(aq) + H2O(l) ⇌ H3O+(aq) + NO2–(aq)

The equilibrium expression is: Ka = [H3O+][NO2–]/[HNO2]Ka = 4.5 × 10–4pH = 1.65This means that:[H3O+] = 10–pH[H3O+] = 10–1.65[H3O+] = 2.24 × 10–2 M Using the ICE table: Initial: C M Change: –x +x +x Equilibrium: C – x x x

The equilibrium expression is: Ka = [H3O+][NO2–]/[HNO2]4.5 × 10–4 = (2.24 × 10–2)(x)/(C – x) Because x is much smaller than C, we assume that C – x ≈ C.

So, the equation becomes:4.5 × 10–4 = (2.24 × 10–2)(x)/C

We solve for x:x = 9.01 × 10–6 M

The equilibrium concentrations of HNO2, H3O+, and NO2– are as follows:[HNO2] = C – x[HNO2] = 0.050 M[H3O+] = x[H3O+] = 9.01 × 10–6 M[NO2–] = x[NO2–] = 9.01 × 10–6 M

The equilibrium concentration of nitrous acid in a solution that has a pH of 1.65 is 0.050 M.

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When an aqueous solution of calcium sulfide is passed through an electrical current, it undergoes electrolysis. The process of electrolysis is the process in which electric current is passed through an electrolyte to cause a chemical change. At the anode of an electrolytic cell, negative ions lose electrons to become neutral atoms or molecules. At the cathode of an electrolytic cell, positive ions gain electrons to become neutral atoms or molecules.

The anode is the electrode that is connected to the positive terminal of a battery. It attracts the negatively charged anions in the electrolyte, which lose electrons and are oxidized. The oxidation occurs at the anode. Anions migrate towards the anode in the solution, where they give up their electrons and form an element or a compound.

The cathode is the electrode that is connected to the negative terminal of a battery. It attracts positively charged cations in the electrolyte, which gain electrons and are reduced. The reduction occurs at the cathode. The cations migrate towards the cathode in the solution, where they gain electrons and form an element or a compound.The chemical equation for the electrolysis of calcium sulfide is:

CaS → Ca2+ + S2-Calcium metal ions will be produced at the cathode. The reduction reaction that occurs at the cathode is: Ca2+(aq) + 2e- → Ca(s)

Sulfur gas will be produced at the anode. The oxidation reaction that occurs at the anode is: S2-(aq) → S(g) + 2e-

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Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore,  production of 39 g of C\(_2\)H\(_2\) requires consumption of 53.6g of H\(_2\)O.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

moles of C\(_2\)H\(_2\)= mass of C\(_2\)H\(_2\)/molar mass of C\(_2\)H\(_2\)

                        =39 g /26.04

                        = 1.49moles

for 1 mole of C\(_2\)H\(_2\), 2 moles of H\(_2\)O is required.

for 1.49 moles of C\(_2\)H\(_2\), 2×1.49=2.98 moles of H\(_2\)O is required.

mass of water= moles× Molar mass

                       = 2.98×18

                       =53.6g

Therefore,  production of 39 g of C\(_2\)H\(_2\) requires consumption of 53.6g of H\(_2\)O.

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Answer:

pOH = 12.50

Explanation:

pOH + pH = 14

pOH = 14 - 1.50 = 12.50

Johnny's percentage error is calculated as= 41%

The quantity of carbon Johnny should have (actual value) = 21.8 g

The quantity of carbon Johnny was able to calculate = 22.7 g

To calculate the percentage error, subtract the actual value from the estimated value. That is,

22.7 - 21.8 g = 0.9 g

This error value obtained is divided by the actual value ( 21.8 g)

0.9 / 21.8 = 0.41

Then multiply by 100%

0.41 × 100.= 41%

Therefore, Johnny's percentage error is calculated as = 41 %

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Answer:

Glacier

Explanation:

Answer: The reactants have four hydrogen atoms and four oxygen atoms. On the other hand, the products have just two hydrogen atoms and three oxygen atoms. So, to balance the chemical equation, there should be two more hydrogen atoms and one more oxygen atom. This imbalance can be corrected by placing the number 2 in front of H2O on the reactants' side.

Answer:

d. soil that is always frozen

Explanation:

Permafrost is the layer of ground that remains frozen the complete year. Soil, rocks and sediments collectively together forms the permafrost. Such soil may remain frozen for a period of two or more than two years. A large part of the Earth's surface has been covered by the layer of permafrost. These are found mainly near the high mountains and especially near North and South poles.

In order to analytically find the transfer function, H(s), of the pH electrode, we can model it as a second-order passive low-pass filter consisting of two RC circuits in series.

The transfer function can be obtained by determining the ratio of the output voltage to the input voltage in the frequency domain.

Let's denote the Laplace transform variable as 's'.

The transfer function H(s) can be expressed as: H(s) = Vout(s) / Vin(s)

For a second-order passive low-pass filter, the transfer function can be written as:

H(s) = 1 / (s + s(R₁C₁ + R₂C₂) + R₁R₂C₁C₂)

Where R₁, R₂ are the resistances in the two RC circuits, and C₁ C₂ are the corresponding capacitances.

Now, let's assume the time constant

τ = R₁C₁ =R₂C₂ = 2 seconds (as given),

we can substitute this into the transfer function:

H(s) = 1 / (s² + 4s + 4)

Simplifying the transfer function further, we can factorize the denominator:

H(s) = 1 / ((s + 2)²)

So, the transfer function of the pH electrode, H(s), is:

H(s) = 1 / ((s + 2)²)

This transfer function represents the relationship between the measured pH (output) and the actual pH (input) of the electrode.

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The complete question should be

The response of a pH electrode can be modeled as a first order or second order passive low pass filter (i.e. two RC circuits in series). A limitation of commercial pH electrodes is their slow response time, which is typically 2 seconds (i.e. = 2 s).

Analytically, find the transfer function, H(s), of this electrode. This transfer function is defined as the measured pH (output) divided by the actual pH (input).

Bases that are useful for deprotonating compounds are:

NaHCO₃ or NaOH.

metal alkoxide

Sodium hydroxide

Benzene rings with carboxylic acids that are weak acids can be prepared using NaOH or NaHCO 3 due to the weakness of the carboxylic acid. deprotonated.

Metal alkoxides such as potassium tert-butoxide can be used to deprotonate benzene rings with three carbon chains attached to one carbon. Also, metal alkoxides are used because the benzene ring containing the hydroxyl group is a very weak acid.

A benzene ring with a hydroxyl group is a weak acid like a benzene ring with a carboxyl group, so it can be deprotonated with NaOH.

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Assuming excess zinc, 2.33 moles of hydrochloric acid would produce 645.13 grams of zinc chloride.

The balanced chemical equation for the reaction between hydrochloric acid and zinc is: Zn + 2HCl → ZnCl2 + H2.

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and zinc (Zn) is:

Zn + 2HCl → ZnCl2 + H2

This equation tells us that 1 mole of zinc reacts with 2 moles of hydrochloric acid to produce 1 mole of zinc chloride and 1 mole of hydrogen gas. Therefore, to determine how much zinc chloride is produced when 2.33 moles of hydrochloric acid reacts completely, we need to use stoichiometry.

First, we need to determine how many moles of zinc chloride would be produced from 2.33 moles of hydrochloric acid. From the balanced equation, we know that the ratio of hydrochloric acid to zinc chloride is 2:1. Therefore, the number of moles of zinc chloride produced would be half the number of moles of hydrochloric acid used:

2.33 moles HCl x (1 mole ZnCl2 / 2 moles HCl) = 1.165 moles ZnCl2

Next, we need to convert moles of zinc chloride to grams. The molar mass of zinc chloride is the sum of the atomic masses of one zinc atom and two chlorine atoms:

1 zinc atom x 65.38 g/mol = 65.38 g/mol Zn

2 chlorine atoms x 35.45 g/mol = 70.90 g/mol Cl

Total molar mass = 65.38 g/mol + 70.90 g/mol = 136.28 g/mol ZnCl2

Now we can use this molar mass to convert moles of zinc chloride to grams:

1.165 moles ZnCl2 x 136.28 g/mol ZnCl2 = 158.3 grams ZnCl2

Therefore, 2.33 moles of hydrochloric acid reacting completely would produce 158.3 grams of zinc chloride.

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answer:

the reason is to ensure more solute is dissolving as it cools down. it is important to do it slowly because water will be sucked into buchner flask by a partial vaccum through the rubber tubing and be able to arrange molecules.

Answer:

Br^-1

Explanation:

It is an ion that gained an extra electron making it 36 electrons but the other. one is in the neutral state with 35 electrons

Answer:

Copper and its compounds have many important uses in modern society. Most electrical equipment has copper wiring. Copper is also used to make many alloys. An alloy is made by melting and mixing two or more metals. The mixture has properties different from those of the individual metals

Explanation:

If a non-volatile sugar is  added to water , the vapor pressure of liquid will tend to decreases and this reduction of vapor pressure is said to be proportional to the numbers of mole fraction of solute that was added to it.

In the case above,  the vapor pressure of the solution is known to be lowered if compared to the vapor pressure of the pure solution.

Therefore if a non-volatile solute is said to be place or added to a pure solution such as water, the vapor pressure of the solution will be reduced than that of the pure solution.

Hence, the statement that If a non-volatile sugar is  added to water , the vapor pressure of liquid will tend to decreases and this reduction of vapor pressure is said to be proportional to the numbers of mole fraction of solute that was added to it is correct.

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The correct answer is Uranium. The fissionable fuel used in most nuclear reactors in the United States is uranium. Specifically, the fuel used is usually enriched uranium, which means that the concentration of uranium-235 (the fissile isotope of uranium) has increased above its natural abundance in uranium ore.

When a uranium atom undergoes nuclear fission, it releases a large amount of energy in the form of heat, which can be used to generate electricity in a nuclear power plant. The fission process also releases neutrons, which can go on to cause additional fissions in nearby uranium atoms, creating a self-sustaining chain reaction.

While plutonium and thorium can also be used as nuclear fuels, they are not as commonly used as uranium in the United States. Tritium is not a fissionable fuel; it is a radioactive isotope of hydrogen that is sometimes used in nuclear weapons and as a tracer in scientific experiments.

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The volume, of a 0.529 m solution of nabh4 is required to produce 0.562 g of b2h6 is 21.5 mL (h2so4 is present in excess).

To answer this question, we need to use the balanced chemical equation for the reaction between NaBH4 and H2SO4 to produce B2H6:
2 NaBH4 + 3 H2SO4 → B2H6 + 2 NaHSO4 + 6 H2O

From this equation, we can see that 2 moles of NaBH4 are needed to produce 1 mole of B2H6.
First, we need to calculate the number of moles of B2H6 produced by the reaction:
0.562 g / 27.67 g/mol = 0.0203 mol

Next, we can use the stoichiometry of the reaction to calculate the number of moles of NaBH4 needed to produce that amount of B2H6:
2 mol NaBH4 / 1 mol B2H6 * 0.0203 mol B2H6 = 0.0406 mol NaBH4

Finally, we can use the molarity of the NaBH4 solution to calculate the volume of solution needed to provide that amount of NaBH4:
0.529 mol/L * (0.0406 mol / 1000 mL) = 0.0215 L
0.0215 L * 1000 mL/L = 21.5 mL

Therefore, the volume of the 0.529 M solution of NaBH4 needed to produce 0.562 g of B2H6 in the presence of excess H2SO4 is 21.5 mL.

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Answer: Possibility of a single replacement reaction

Explanation:

The activity of the series of element is determined by the single replacement reactions. The activity series of element can be used to predict the possibility of a single replacement reaction.

A single replacement reaction is one in which one substance is replacing the other. The replacement of a metallic ion in solution by a metal atom higher in the activity series than the metal in solution falls into this category of reactions.

The reaction is depending on the reactivity of the elements. If the reactivity of the elements is very low, then the reaction very slow, some time reaction can not take place. To get reaction there is some driving force is needed.

The relative position of the two elements in the activity series provides the driving force for this kind of reaction. More active elements undergo readily reaction then less reactive like noble gas elements. It very necessary to elements very active to get react.

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Answer:

3.6 gallons are equal to 56 cups

Answer:

C. one star

Explanation:

Of course our solar system has one unique star which is the sun while others have atleast two which are called binary solar

Answer:

here u go

Explanation:

Sexual reproduction results from the fusion of gametes produced by male and female. Sexual reproduction causes more viable variations because:

→ There might be an error in the copying of DNA, though the event is rare.

→ Segregation of chromosome of maternal and paternal origin at the time of gamete formation is random.

→ There is an exchange of genetic material between homologous chromosomes during formation of gametes.

In case of asexual reproduction, variation is significantly less since only a single parent is involved. Very small changes occur due to inaccuracies during DNA copying that pass on to the progeny. Thus, offsprings of asexual reproduction are more or less genetically similar to their parents. So, it can be concluded that evolution in sexually reproducing organisms proceeds at a faster pace than in asexually reproducing organisms.

The structure and function of chromosomes convey a particular sequence, so any variation in biological reproducing organisms produce a different sequence from chromosomes.

In our body 23 pairs of chromosomes are present and 23rd pair is known as the biological chromosome as it is responsible for the gender of new offspring.

Chromosomes are present in the DNA structure and helps in the transfer of genetic material. As we know that in biological reproduction, male and female both are involved and minor change in the sequence of process creates variation in biological reproducing organisms. Like during the meiosis some changes in the cross over process, dynamic union of gametes from male organism, independent assortment during fertilization and many more explains the variation in biological reproducing organisms.

Hence, as chromosomes carry particular sequence so any variation is determined by its structure.

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Answer:

1.02 (or 1.03 if rounded)

Explanation:

Given 16.4 grams of oxygen gas, you would want to write that down to set up your unit conversions.

16.4 g O2/1 * 1 mol of O2/31.998 g O2 * 2 mol H2O/1 mol O2

Multiply the numbers on the top and divide that by the product of the numbers on the bottom.

16.4 * 1 * 2 = 32.8

1 * 31.998 * 1 = 31.998

32.8/31.998 = 1.025...

Don't forget to consider the number of significant figures if it asks!