Photosystem II is responsible for the production of _______ from the splitting of water.Question 22 options: oxygen electrons carbon dioxide G3P

1) List the known and unknown quantities.

Sample: luminol.

Mass: 10.0 g.

Volume: 75.0 mL.

Molarity: unknown.

2) Set the equation.

3) Conversion of units.

3.1-Convert mass to moles.

The molar mass of luminol (C8H7N3O2) is 177.1601 g/mol.

3.2-Convert mL to L.

1 L = 1000 mL

4) Plug in the known quantities.

The molarity of the stock solution is 0.75 M C8H7N3O2.

.

The dose of the medicine per one kilogram of a body is 2.5 mg then , the dose of medicine required for 66 lb weight or 29.8 Kg is 74.5 mg.

Dose of a medicine is the amount of that medicine required to be taken for one time. It can be measured per Kg of body and the dose of medicine can be g or mg.

lb is a unit of weight. Generally we are using kilogram (Kg) unit of for kg. One lb weight = 0.453 kg.

Hence, 66 lb in kilogram weight is written as: 66 × 0.453 Kg = 29.8 Kg. The dose of medicine is 2.5 mg/kg which means, 2.5 mg is required for 1 Kg body.

The dose of the medicine required for 66 lb or 29.8 Kg is calculated by multiplying the dose required for 1 kg to the actual weight of the child as follows:

Dose =  29.8 × 2.5

         = 74.5 mg.

Thus, the child that weighs 66 lb or 29.8 kg is required to take the medicine of 74.5 mg dose.

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Nuclear energy produces electricity or electrical energy that can be used to power homes, schools, businesses, and hospitals.

A type of energy emitted by an atom's nucleus, which is composed of protons and neutrons, is known as nuclear energy. Fission, which occurs when atoms' nuclei split into numerous portions, and fusion, which occurs when nuclei fuse together, are the two methods in which this type of energy can be created.

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Answer:

Criteria for spontaneity in terms of free energy change: (i) If ∆G is negative, the process is spontaneous. (ii) If ∆G is positive, the direct process is non-spontaneous. (iii) If ∆G is zero, the process is in equilibrium.

One mole of a substance contains 6.02×10²³ atoms. This number is called Avogadro number. The mass of 532 atoms of Fe is only 4.93×10⁻²⁰ g.

Any substance which contain 6.02×10²³ atoms is called one mole of the substance.  One mole of iron (Fe) is 55.85 g and it contains Avogadro number of atoms or  6.02×10²³ atoms.

Iron is a transition metal with electropositive character and is an essential metal in construction field and in electronic devices.

The atomic mass of iron = 55.85 g/mol.

If 55.85 g of Fe contains 6.02×10²³ atoms, the mass of iron which contain 532 atoms is then calculated as follows:

mass of iron  = (532 × 55.85 g) / 6.02×10²³

                      = 4.93×10⁻²⁰ g.

Hence, The mass of 532 atoms of iron is only 4.93×10⁻²⁰ g.

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The volume of 79.1 liters of oxygen (O₂) will be produced at a temperature of 370°C and 1520 torr if 2 moles of KClO₃ decompose.

The molar volume (Vm) is the volume occupied by 1 mole of a chemical element or a chemical compound at Standard Temperature and Pressure (STP). Molar gas volume is one mole at a specific temperature and pressure and has a fixed volume.

The Molar volume is inversely proportional to density and directly proportional to molar mass. One mole of any gas at STP occupies a volume of 22.4 liters.

Given, the 2moles of  KClO₃ will produce  O₂ gas = 3moles

The volume occupied by 3 moles of the oxygen gas at 370°C and 1520 torr is :

Given, n = 3, P = 1520 torr = 2atm and T = 370°C  = 643 K

PV = n RT

(2atm) V = (3)(0.082 atm L /K) (643K)

V =79.1 L

Therefore, the volume of oxygen gas produced will be equal to 79.1 Litres.

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Non-renewable resources are resources found by humans as a source of energy and such resources cannot be replenished. Therefore such resources should not be wasted.

The earth is rich in resources. Some are unlimited others are inherently limited. Renewable resources are unlimited and can be replenished. However non-renewable resources are finite and must be used carefully to ensure long-term use for future generations. Wood is a renewable resource. This means you can grow additional resources in place of felled wood.

Non-renewable energy comes from resources that are depleted or not replenished over and over again throughout our lifetime. Most non-renewable energy sources are fossil fuels such as coal oil and natural gas. Carbon is the main element of fossil fuels. Air and water are also renewable natural resources. They don't grow like trees or have babies like animals. But they are constantly updated. They move cyclically.

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Answer:

so I can do it tomorrow

Explanation:

3(+7-(#679''78()

wag nyo na po pansinin yung nasa taas bwahahahaha

Answer:

A mixture is a combination of two or more substances in any proportions. The substances in a mixture do not combine chemically, so they retain their physical properties. A homogeneous mixture has the same composition throughout.

Answer

41.2 L

Explanation

Given that:

The mass of oxygen gas (O₂) = 58.9 grams

What to find:

The volume of 58.9 grams of oxygen gas (O₂) at STP.

Step-by-step solution:

The first step is to convert 58.9 grams of oxygen gas (O₂) given to moles using the mole formula:

The molar mass of oxygen gas (O₂) is 31.998 g/mol.

The final step is to convert the 1.8407 moles of oxygen gas (O₂) to volume using the conversion factor below.

Conversion factor: The molar volume of any gas at STP is 22.4 L. That is, one mole of any gas has a volume of 22.4 L or 22,400 mL.

So,

speed of the electron  =  0.93*speed of light

                                   = 0.93*3.00 × [tex]10^{8}[/tex] m/s*(0.6214 mi/1 km)*(3600 s/hr)

                                   = 6.24X [tex]10^8[/tex] mi/hr

Speed is defined as the rate at which the position of an object changes in any direction.

There are four types of speed and they are:

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Answer:

D because...........that is the answer

Explanation:

your welcome

We obtain the nutritional calories as 2967 cal/g.

Now we know that heat is evolved when we combust a compound or a substance inside the bomb calorimeter. Given that we have the following information about the system;

Temperature rise = 2.42 ∘C

Heat capacity =  30.70 kJ⋅K−1

The we have the energy as obtained from;

H = 30.70 kJ⋅K−1 * 2.42 ∘C = 74.29 kJ or 17.8 * 10^3 cal

Now we are required in this question as we have it to obtain the heat capacity per gram as; 17.8 * 10^3 cal/6g = 2967 cal/g

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From the calculation that is based on the ICE table shown, the pH of the solution is  1.8.

Let us recall that the KNO2 is a salt of the nitrous acid. Our concern now would be on the nitrous ion and we are going to make up the ICE table from the following;

    NO2^-(aq) + H2O(l) ⇄  HNO2(aq) + OH^-(aq)

        HNO2 (aq) ⇄   H^+(aq) +  NO2^-(aq)

I        0.59                 0                0

C      -x                      +x               +x

E     0.59 -x             x                  x

Now we know that the Ka of HNO2 is 4.0x10^-4.

Ka = [H^+] [NO2^-]/[ HNO2]

4.0x10^-4 = x^2/0.59 -x

4.0x10^-4(0.59 -x) = x^2

2.36 x10^-4 - 4.0x10^-4x = x^2

x^2 +  4.0x10^-4x - 2.36 x10^-4  = 0

x=0.015

pH = -log(0.015)

pH = 1.8

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Answer:

the conditions are that when the moon is at point 2 is that the moon is covering Florida so that means that part of the earth is dark whilst others is light

Explanation:

A cold air mass colliding with a hot air mass triggers the development of a tornado and is denoted as option D.

This is referred to as a violently rotating column of air and it is caused as a result of different types of factors such as the humidity , temperature etc.

A tornado is usually very violent and it is formed when cold air mass collides with a hot air mass and is often characterized by a green color in most situations and is therefore the reason why option D was chosen as the most appropriate choice.

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Answer:

Electrons are transferred from atoms of sodium to atoms of phosphorus. This transfer makes the sodium atoms positive and the phosphorus atoms negative. As a result, the sodium and phosphorus atoms strongly attract each other.

Explanation:

Taking into account the reaction stoichiometry, 65.32 grams of B₂H₆ will react with 7.1 mol of O₂.

In first place, the balanced reaction is:

B₂H₆ + 3 O₂ → B₂O₃ + 3 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 3 moles of O₂ react with 27.6 grams of B₂H₆, 7.1 moles of O₂ react with how much mass of B₂H₆?

mass of B₂H₆= (7.1 moles of O₂× 27.6 grams of B₂H₆)÷ 3 moles of O₂

mass of B₂H₆= 65.32 grams

Finally, 65.32 grams of B₂H₆ is required.

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Answer:

Investigating Energy Systems

Posible Subclaims:

The Hand-Crank Generator System does have energy.

or

The Hand-Crank Generator System does not have energy.

Evidence

The thermal energy will affect the temperature of road and increase the temperature which causes cracks on the roads after some times. Thus the construction team must use temperature resistant material.  

Thermal energy is defined as internal energy present in a thermodynamically balanced system as a result of its temperature.

It can also be defined as the energy derived from matter's temperature.

There are three types of thermal energy transfer.

Thus, the  thermal energy will affect the temperature of road and increase the temperature which causes cracks on the roads after some times. Thus the construction team must use temperature resistant material.  

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The correct ionization equation for a weak acid is as follows: HA + H₂O ⇌ A + H₃O⁺ (option A).

A weak acid is an acid that partially dissociates into its ions in an aqueous solution or water. In contrast, a strong acid completely dissociates into its ions in water.

The conjugate base formed when a a weak acid dissociates is a weak base. Examples of weak acids are as follows:

The reaction arrow for a weak acid ionizing in water is a double arrow, indicating that both the forward and reverse reactions occur at equilibrium.

Therefore, HA + H₂O ⇌ A + H₃O⁺ is the ionization reaction that represents a weak acid.

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First of all we must know this:

1 mol of Ti,= 47.90 g of Ti, furthermore we can say that:

1 mol Ti = 47.90 g Ti = 6.022x10^23 formula units (atoms, molecules, ions, etc.) and in this case, we work with atoms of Ti.

Procedure:

47.90 g (1 mol) of Ti ------------------ 6.022x10^23 atoms of Ti

X ------------------ 5.74x10^22 atoms of Ti

X = 4.600 g of Ti

Answer: 4.600 g of Ti

378mL is the volume of a 10% m/v aqueous solution that contains 37.8g of HN03

A solution in which the solvent is water is referred to as an aqueous solution. By adding (aq) to the appropriate chemical formula, it is typically shown in chemical equations. For instance, Na+(aq) + Cl would be used to represent a table salt solution (also known as sodium chloride, or NaCl) in water (aq).

The word aqueous, which derives from the Latin word aqua, means being or consisting of water. Water is a common solvent in chemistry because it works great as a solvent and is also readily available. In experiments, water is frequently used as the solvent; therefore, unless otherwise specified, the term "solution" refers to an aqueous solution.

The mass of HNO3 =  37.8g

The mass is 10% m/v of the solution which implies

10/100 = mass/ volume

Volume = 10mass

Volume = 10(37.8g)

Volume = 378mL

Thus, 378mL is the volume of a 10% m/v aqueous solution that contains 37.8g of HN03

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Water vapor with a total mass of 10.29 g occupies 6.07 x 10⁻5 mL of volume.

Density of substance is defined as the mass of the substance per unit of its volume.

We know that,

Density of water vapor at 100°C and standard pressure is 5.9 x 10⁻⁴ g/cm³. To calculate volume, we will use the formula of density, which is -

density =   mass  

               volume

volume = mass x density

We know from the question that,

mass = 10.29 g

Substituting values in the equation,

volume = 10.29 x 5.9 x 10⁻⁴

volume = 6.07 x 10⁻⁵ mL

Hence, the volume occupied by the water vapor is 6.07 x 10⁻⁵ mL

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Answer:

There are three major hazards that may be introduced into the food supply any time during harvesting, processing, transporting, preparing, storing and serving food. These hazards may be microbiological, chemical or physical.

Explanation:

microbiological hazards

Microbiological hazard occurs when food becomes contaminated by microorganisms found in the air, food, water, soil, animals and the human body. Many microorganisms are helpful and necessary for life itself. However, given the right conditions, some microorganisms may cause a foodborne illness. Microorganisms commonly associated with foodborne illnesses include bacteria, viruses and parasites.chemical hazardsChemical hazards can occur at any point during harvesting, storage, preparation and service. When toxic chemicals used for pest control or for cleaning and sanitizing food contact surfaces and food preparation equipment come into contact with food, the food may be contaminated by those chemicals.Toxic metals such as copper, brass, cadmium, lead and zinc can be a source of chemical contamination. Zinc, used in galvanized containers (garbage cans) and in gray enamelware containers which may be plated with anatomy or cadmium, can make acidic foods such as orange juice or tomato sauce and pickles poisonous. Pottery dishes with lead glazes should not be used to prepare or serve food.Intentionally added chemicals help to maintain a food’s freshness or to enhance flavors in foods. Check the food ingredient label for more information about the additives. Excessive use of some additives has been linked (see Fact Sheets on Food Allergies and Food Additives) to cases of lethal allergic reactionsparticularly among sensitive individuals, in particular, asthmatics.Foodservice establishments are prohibited by law from using sulfites to maintain product freshness. However, they are still approved for use in some food processing operations, for example, processing shrimp and manufacturing wine. If they are used, the product must be clearly labeled.physical hazardsPhysical hazards usually result from accidental contamination and /or poor food handling practices. Examples include, slivers of glass, human hair, nails, false nails, nail polish, pieces of jewelry, metal fragments from worn or chipped utensils and containers, dirt, stones, frilled toothpicks.Pesticides may leave residues on fruits and vegetables. In general, these residues can be removed by scrubbing the surface and washing with water.Food irradiation is classified as a food additive and is regulated by the Food and Drug Administration (FDA). Irradiation is a process which destroys pathogenic and spoilage microorganisms without compromising safety, nutrition or quality and significantly lengthens storage life. In general, spices are irradiated as a means of controlling bacterial growth and mold. According to Dr. Donald Thayer of the USDA Agricultural Research Service, irradiation looks promising as a treatment for controlling cylospora in fresh produce like raspberries . Contact your local Cooperative Extension office for the latest information on irradiation.

Answer:

Explanation:

Here, we want to balance the given chemical equation

We can start by balancing the oxygen atoms

We have 7 on the left and 2 on the right

To make a balance, we place 7 before the molecular oxygen on the left and 2 on the given oxide

That means we would be having 4 Rh on the left

To balance the Rh, we have to place 4 on the left side

Thus, we have the balanced equation as:

If you've done stoichiometry already, it's easiest to do enthalpy problems like this in the same way where your ∆H is just part of the 'railroad tracks'.

-34.2 kJ (2 mol KClO3/-89.4 kJ) = 0.765 mol KClO3

No. of atoms in 39.1g of P is 7.59× 10²³ atoms.  No. of atoms in 8.97g of Bi is 2.58 × 10²² atoms

1. Given,

 we have to find number of atoms in 8.97g of Bi

Now,

Molecular weight of Bi = 209g

 Hence,

 1 mole of Bi = 209g

209 g of Bi = 6.022 × 10²³ atoms

Hence,

  8.97 g of Bi = 6.022 × 10²³ × 8.97 / 209 atoms

Number of atoms in 8.97g of Bi = 2.58 × 10²² atoms

2.  we have to find number of atoms in 39.1g of P

Now,

Molecular weight of P = 31g

 Hence,

 1 mole of P = 31g

31 g of P= 6.022 × 10²³ atoms

Hence,

 39.1 g of P = 6.022 × 10²³ × 39.1/31 atoms

No. of atoms in 39.1g of P = 7.59× 10²³ atoms

Thus, from the above conclusion we can say that , No. of atoms in 39.1g of P is 7.59× 10²³ atoms.

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Answer

pH = 1.26

Explanation

If the [H3O+] of an aqueous solution is 0.055 M, then its pH can be calculated using the pH formula below.

The pH of an aqueous solution of 0.055 M is 1.26

Answer

V₂ = 1.9 L

Explanation

Given:

P₁ = 1.5 atm

V₁ = 3.0 L

T₁ = 20⁰C = (20 + 273 )K = 293 K

P₂ = 2.5 atm

T₂ = 30⁰C = (30 + 273 )K = 303 K

What to find:

V₂

Step-by-step solution:

The unknown V₂ can be determined using the combined gas equation, which is given below.

Putting the values of the given parameters into the equation, we have

Therefore, the unknown V₂ in number 1 is 1.9 L