HIGH SCHOOL CHEMISTRY #8-15
PLEASE HELP!!

Answer:

To find the mass of the solute in the solution, we first need to convert the percent to a decimal by dividing by 100. Since the percent is 4%, we can divide by 100 to get 0.04.

Next, we can multiply the decimal value by the total mass of the solute to find the mass of the solute in the solution. In this case, the total mass of the solute is 200g, so we can multiply 0.04 by 200g to get:

0.04 * 200g = 8g

Therefore, the mass of the solute in the solution is 8g.

The oxidation-reduction process is present in each of the responses to this question. Redox reaction is another name for it. See down for more details

It is known as the process in which oxidation and reduction happen at the same time. Both the oxidation and reduction processes proceed simultaneously. While electrons are obtained during a reduction reaction, they are lost during an oxidation reaction. (a) This process is an oxidation-reduction reaction because bromine's oxidation state moves from (-1) to (0), demonstrating oxidation, and sulfur's, from (+6) to (+4), demonstrating reduction. (b) Because nitrogen moves from (+5) to (+2), indicating reduction, and sulfur changes form (+4) to (+6), indicating oxidation, this reaction involves both oxidation and reduction.(c) (c) The change in the oxidation states of iodine from (-1) to (+5), which indicates oxidation, and chlorine from (+5) to (-1), which indicates reduction, indicates that this process involves oxidation-reduction. (d) Because the element is present on both the reactant and product sides, this reaction does not involve an oxidation-reduction reaction.

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In water, a highly soluble sodium hydroxide compound dissociates to give sodium ion and hydroxide ion as an example of an Arrhenius base.

To enhance the concentration of hydroxide ions, NaOH entirely dissolves in aqueous solution to give hydroxide ion and sodium ion. The Arrhenius theory, proposed in 1887 by the Swedish scientist Svante Arrhenius, states that acids dissolve in water to produce electrically charged atoms or molecules known as ions, one of which is a hydrogen ion (H+), and that bases ionize in water to produce hydroxide ions (OH). As a result, water is a material that dissociates in water to create H+ ions. It also meets the definition of a material that dissociates in water to create OH ions.

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The answer is D. moles x molar mass.

Number of moles divided by molecular weight equals the substance's mass.Since the question states that glucose has a molecular weight of 180.16, plugging in our calculations shows that we require 180.16 x 1.5 = 270.24 g of sugar.

There are numerous instruments available for determining mass in various settings.The utilization the gravitational interaction between things is one of them, along with balances and scales, measuring transducers, vibrating tubes sensors, Newtonian weight measurement devices, and balances and scales.

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Answer:

Hope this help you i try my best :)

The Order of the reaction is zero. The rate law for the reaction is rate = k[CH₃CH₂OH]⁰.  The rate constant for the reaction is 4.0 x 10⁻⁶ Ms⁻¹. the final presure is 0.8 atm.

The order of the reaction is zero. The plot on tye left is a straight line, indicating that the rate is decreasing in[ ethanol] is constant as [ ethanol ] changes. Therefore the rate of the reaction does not depend on the[ethanol] because of the order of the reaction is zero the rate law for the reaction became  rate = k[CH₃CH₂OH]⁰.

The rate constant can be calculate as follows:

rate = k = - Δ [ethanol] = - (0.0020-0.0100) mol/L

                      Δt                        2000s

rate = 4.0 x 10⁻⁶ Ms⁻¹

The final pressure is 0.080 its twice the original pressure because the product represent twice as many moles of gas as reactant

your question is incomplete but most probably your full question attached below

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Initially the sample will be in solid form and finally it will in gaseous form.

What is melting point ?

A substance's melting point is the temperature at which it transforms from a solid into a liquid. The equilibrium between the solid and liquid phases exists at the melting point. A substance's melting point is dependent on pressure, and it is typically expressed at a standard pressure such 1 atmosphere or 100 kPa.

Melting point of nitrogen =63.15K

Boiling point of nitrogen = 77.355K

Below 63.15K it is in solid form and above this it will be in liquid form.

Below 77.355K it is in liquid form and above this it will be in gaseous form.

Initially it is 59K means in solid form.

And finally it is 129K means in gaseous form.

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The sample will first take on a solid form before transitioning to gaseous form.

What do melting and boiling points mean?

The temperature at which a substance's solid and liquid phases are in equilibrium is known as its melting point. The temperature at which a substance's vapour pressure equals the atmospheric pressure is known as the boiling point of that material.

Physical and chemical changes can cause matter to transform into different forms, but no matter what happens, matter is always conserved. There is no creation or destruction of matter; the amount of matter is the same before and after the transformation. The Law of Conservation of Mass is the name given to this idea.

Nitrogen's melting point is 63.15 K and its boiling point is 77.355K. It is solid at temperatures below 63.15K and liquid at temperatures beyond this. It has a liquid state below 77.355K and a gaseous state above this.

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Given a mass of 14 g and a volume of 28 ml, the density in g/ml is

0.5 grams per cubic centimeter.

What is density in g/ml?

Density is the mass of a substance in relation to its volume. Despite the fact that the Latin letter ρ can also be used, the symbol for density that is utilized the most frequently is. The size of how tightly a cloth is packed together is called density. it's far characterized as the mass predictable with unit amount.

ρ = m/V, where m denotes the item's mass, V denotes its quantity, and m denotes its density.

According to the given question:

A material substance's density is defined as its mass per unit volume. D is density, M is mass, and V is volume, therefore the formula for density is d = M/V.

d = M/V :

- 14/28= 1/2 = 0.5 grams per cubic centimeter.

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One dose of antiacid A will neutralize more stomach acid (0.019 mol) than one dose of antacid B (0.01 mol).

Stomach acid is HCl. The reaction of HCl with each of the active ingredients of the antiacids is expressed in the following equations:

[tex]3HCl + Al(OH)_3 --- > AlCl_3 + 3H_2O[/tex].......................Eqn 1

[tex]2HCl +CaCO_3 --- > CaCl_2 + H_2O + CO_2[/tex]...................Eqn 2

In equation 1, the mole ratio of stomach acid to [tex]Al(OH)_3[/tex] is 3:1.

Mole of 0.50 g  [tex]Al(OH)_3[/tex] = 0.5/78 = 0.0064 mol

The equivalent amount of stomach acid to be neutralized = 0.0064 x 3 = 0.0192  mol

In equation 2, the mole ratio of stomach acid to [tex]CaCO_3[/tex] is 2:1.

Mole of 0.50 g  [tex]CaCO_3[/tex] = 0.5/100 = 0.005

The equivalent amount of stomach acid to be neutralized = 0.005 x 2 = 0.01 mol.

Thus, one dose of antiacid A will neutralize more stomach acid (0.019 mol) than one dose of antacid B (0.01 mol).

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The name of [tex]H_{3} PO_{4}[/tex] is Phosphoric acid.

Phosphoric acid (orthophosphoric acid, mono-phosphoric acid, or phosphoric(V) acid) is an inorganic phosphorus-containing solid with the chemical formula [tex]H_{3} PO_{4}[/tex]. It is most commonly encountered in the form of an 85% aqueous solution, which is a colorless, odorless, non-volatile syrupy liquid. It is a significant industrial chemical that is found in many fertilizers.

The term "orthophosphoric acid" is used to differentiate this acid from other "phosphoric acids," such as pyrophosphoric acid. Nonetheless, the term "phosphoric acid" is frequently used to refer to this specific compound, and this is the current IUPAC nomenclature.

Food-grade phosphoric acid is used to acidify foods and beverages like colas and jams, giving them a tangy or sour flavour. Phosphoric acid is also used as a preservative. Soft drinks containing phosphoric acid, such as Coca-Cola, are sometimes referred to as phosphate sodas or phosphates. Soft drinks contain phosphoric acid, which has the potential to cause dental erosion.

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As a result, aluminum interacts with oxygen gas to form aluminum oxide, which results in the chemical reaction 4Al+3O22Al2O3. oxygen gas.

At room temperature, oxygen is a gas that lacks all other flavors, smells, and colors. Molecular oxygen can be found in nature. To create dioxygen, often known as O2, two oxygen atoms form a covalent double bond. As a molecule, oxygen is typically present.

The reactive gas oxygen (O2) has no color or smell. A little under 21% of the oxygen is made up of it, which is the most common feature in the earth's crust and is primarily found in oxides, silica, and carbonates.

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Answer:

C. 2 protons, 2 electrons, and 1 neutron.

Explanation:

An atom that has no charge is one that has an equal number of protons and electrons. Protons have a positive charge, while electrons have a negative charge, so an atom with an equal number of protons and electrons will have a net charge of zero.

Therefore, the correct answer is C: 2 protons, 2 electrons, and 1 neutron. This atom would have two positive charges (from the protons) and two negative charges (from the electrons), which cancel each other out, resulting in a neutral charge.

True. Electrolysis can be used to resolve hydrogenation pathways at palladium surfaces in a membrane reactor. It uses electro catalytic palladium membrane reactor.

Palladium surface membrane reactors use electricity to hydrogenate organic molecules at ambient temperature and pressure. These reaction conditions position ePMRs as a sustainable alternative to thermochemical hydrogenation which requires high-temperature and high-pressure reaction conditions. The electro catalytic palladium membrane reactor uses electrolysis and a hydrogen-selective palladium membrane to deliver reactive hydrogen to a catalyst surface in an adjacent compartment for reaction with an organic substrate. This process forms the requisite metal-hydride surface for hydrogenation chemistry but at ambient temperature and pressure and without a H2 source.

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Answer:

Once a density has been calculated the tool will also display two conversion scales for a range of mass and volume values

Explanation:

The density of this particular liquid is [tex]5833 kg/ m^3[/tex].

Density is defined as mass per unit volume. It is a standard mechanical quantity. The most frequently used symbol for density is ρ (rho), D can also be used which is a Latin letter.

It can be expressed as

[tex]\rho ={\frac {m}{V}}\\\\\rho = density \\m = mass\\V = volume[/tex]

Density is expressed in [tex]kg/m^3[/tex] , mass in kg and volume in [tex]m^3[/tex]

For above given information,

Mass= 350 g= 0.350kg

Volume= 60ml = 0.00006 [tex]m^3[/tex] ([tex]1ml= 1/10^6 m^3[/tex])

So, Density= 0.350/0.00006 = [tex]5833 kg/m^3[/tex]

Thus, the density of this particular liquid is [tex]5833 kg/ m^3[/tex].

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The pair of coordination isomers is [Ni(NH3)3Br]Cl and [Ni(NH3)3Cl]Br.

A coordination complex is made up of a central atom or ion, which is usually metallic and is known as the coordination centre, and a ring of bound molecules or ions, which are known as ligands or complexing agents. Coordination complexes are found in many metal-containing compounds, particularly those containing transition metals.

The coordination sphere is made up of the central atom or ion and all ligands. The first coordination sphere is made up of the central atoms or ions and the donor atoms. The coordination number is the number of donor atoms attached to the central atom or ion. The most common coordination numbers are 2, 4, and 6, in particular.

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Answer:

D. 1s²2s²2p 3s²3p6

Explanation:

The most chemically stable electron configuration is typically the one that has a full valence shell, which means that the outermost electron shell is completely filled with electrons. In this case, the electron configuration with a full valence shell is 1s²2s²2p 3s²3p6. This configuration is often called the "noble gas" configuration, because it is similar to the electron configuration of a noble gas, such as neon or argon, which are extremely stable and unreactive.

Answer:

.675

Explanation:

when going down on the chart you move the decimal point to the left however many times you go down

A basic solution is one that contains a salt of a strong base and a weak acid. The solution is acidic because it contains a salt of strong acid and weak base.

A neural solution is one that contains the salts of a strong acid and a strong base.

The solutions NaCl,KBr are neutral, NaCN, NaNO 2 and KF are basic, and NH4 NO 3 is acidic.The pH scale is employed to ascertain whether a solution is acidic or basic. It has a number from 0 to 14, with 7 representing neutral. Any of it less than 7 is an acid, and anything greater than 7 is a base. The pH scale is a logarithmic scale, with a pH of 2 being 10 times more alkaline than a pH of 3. Because their pH is less than 7, acids such as HCl (the acid in ones tummy that aids digestion) and lemon juice are all amino acid (neutral). Water, for example, has a pH level of 7 when it is neutral. You are a base with a pH of 8-16 when you're dealing with a basic substance.

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To solve this, we must be knowing each and every concept related to bond enery and enthalpy o formation. Therefore, the correct option is option C among all the given options.

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances. Internal energy is the sum of all kinds of energy that the particles of a matter can possess, for example translational energy. Rotational energy.

Bond energy is directly proportional to the bond strength. since the bond enthalpy of H-F is the highest among all the given bond energy. H-F has the largest enthalpy of formation.

Therefore, the correct option is option C.

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Answer:

The amount of heat that must be removed from steam at 100 degrees Celsius to get ice at -273 degrees Celsius can be calculated using the formula for the heat of fusion of water. The heat of fusion of water is approximately 333.55 joules per gram, which means that it takes 333.55 joules of energy to convert 1 gram of liquid water at 0 degrees Celsius to 1 gram of ice at 0 degrees Celsius.

To convert 0.000010 kg of steam at 100 degrees Celsius to ice at -273 degrees Celsius, we must first convert the steam to liquid water at 100 degrees Celsius, which requires the addition of heat. The heat required to do this can be calculated using the specific heat capacity of water, which is approximately 4.186 joules per gram per degree Celsius. The specific heat capacity tells us how much heat is required to raise the temperature of 1 gram of a substance by 1 degree Celsius.

To convert 0.000010 kg of steam at 100 degrees Celsius to liquid water at 100 degrees Celsius, we would need to add (0.000010 kg) * (100 degrees Celsius) * (4.186 joules/gram/degree Celsius) = 0.004186 joules of heat.

Once the steam has been converted to liquid water, we can then convert the water to ice at -273 degrees Celsius. To do this, we would need to remove (0.000010 kg) * (333.55 joules/gram) = 0.033355 joules of heat.

In total, we would need to remove 0.004186 joules + 0.033355 joules = 0.037541 joules of heat from 0.000010 kg of steam at 100 degrees Celsius to get ice at -273 degrees Celsius.

Explanation:

In balanced chemical reaction of silver nitrate and calcium chloride the amount of the 0.005 moles of silver chloride and 0.0025 moles of calcium nitrate.

In balanced chemical reaction

2AgNO₃(aq) + CaCl₂ (aq) ⇒ 2AgCl(s) + Ca(NO₃)₂(aq)

Given :

Silver nitrate = 1.00 M

Calcium chloride = 0.100 M

In a reaction 25 moles of each reactant is mixed.

Silver nitrate = 1.00 M x25 ml /1000

Silver nitrate moles in 25 ml = 0.025

Calcium chloride = 0.100 M x 25 ml/1000

calcium chloride moles in 25 ml = 0.0025

∵ 0.0025 ml of silver nitrate requires 0.0125 moles of calcium chloride. So limiting reagent is calcium chloride.

CaCl₂      ⇒       2AgCl(s)         +       Ca(NO₃)₂

1 mole      ⇒       2 moles                   1 moles

0.0025    ⇒       0.005                      0.0025

Hence, concentration of the product depend on the limiting reagent.

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The Loma Prieta earthquake rocked Northern California just before the start of Game 3 of the 1989 World Series. Therefore, the diagram accurately depicts convergent boundaries as the cause of the plate movement that led to the earthquake.

Despite the fact that tectonic plates are always moving slowly, friction makes their edges impenetrable. When the stress just on edge is greater than the friction, waves of energy are released, which travel through earth's crust & cause the shaking we feel. The earth's surface trembling is referred described as a "earthquake." The Earth's surface is trembling unexpectedly. Undoubtedly, earthquakes are a dreadful form of nature's devastation. Earthquakes can also significantly harm both people and property. There are certain weak Earthquakes that most likely go unreported.

The unexpected fracturing of subsurface rock and quick movement across a fault are the usual causes of earthquakes. This sudden release of energy results in these seismic waves, that shake the ground.

Even though we cannot prevent natural earthquakes from occurring, we can significantly lessen their effects by identifying risks, building structures that are more earthquake-resistant, and spreading earthquake safety knowledge. Being ready for natural earthquakes can help us reduce the likelihood of earthquakes brought on by humans.

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The no. of electrons needed are 3 for the following half-equation is balanced using the lowest possible whole numbers is NO three− +4H + +e − →2H 2 O+NO.

The oxidation numbers for nitrogen has been assigned.

+5N O three− +4H + +e → 2H 2 O+ +2N O

This is a discount 1/2 of equation. All atoms are balanced.

We stability prices via way of means of including the proper quantity of electrons.

NO three− +4H + +3e − →2H 2 O+NO

This is a balanced discount 1/2 of-reaction.

Thus, the quantity of electrons required to stability the equation is three.

Hence, the best choice is 3 .

The balancing steps are proven below:Some nitrogen in nitrate anion is oxidized from +three to +five in nitrate anion.Oxidation 1/2 of-reaction: NO−2(aq)→NO−three(aq)+2e−2OH−(aq)+NO−2(aq)→NO−three(aq)+2e−2OH−(aq)+NO−2(aq)→NO−three(aq)+2e−+H2O(l).

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Answer:

C. 43.9 g

Explanation:

The formula for calculating the heating of the water:

Q = m * C * ΔT

Where Q is the amount of heat required, m is the mass of the object, C is the specific heat capacity of the material, and ΔT is the change in temperature. Plugging in the values from the problem, we get the following:

Q = 4000 g * 4.184 J/g°C * (100°C - 20°C) = 1,338,880 J = 1338.88 kJ

The mass of anthracite coal required:

[tex]m_{coal}[/tex] =  1338.88 kJ / 30,500 kJ/kg = 0.0439 kg = 43.9 g

The proper numbering is 4, 2, 1, and 3.

The following sequence of actions can be used to describe how an undersea sedimentary rock is formed.

Sedimentary Rock

In a basin, sediments and animal skeletons start to accumulate.

The material that has been deposited starts to become bound together by a glue ingredient brought in by running water, such as calcite or clay. The deposits start to become harder.

The deposits eventually transform into rock that is solid and hard. The new rock is a mixture of several organic and inorganic components.

Existing rocks become sediments as a result of weathering.

What causes sedimentary rocks to form?

Sedimentary rocks are formed when previously existing rocks or pieces of extinct animals accumulate on the surface of the Earth. Sediment that has been buried deeply becomes compacted

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Answer:

less the number of electrons

Explanation:

electrons have a negative charge