11) Identify the number of elements and the number of atoms present in the chemical formula. NaHCO ²
4; 6
5; 6
4,5
3; 5​

The given statement, production associates are not allowed to view the process safety management documents. They are only for supervisors and upper management is true.

Since they provide advice on how to manage the risks and hazards connected to certain operations or processes, these documents are often written with supervisors and top management in mind. This is done to make sure the management team has the knowledge it needs to decide on process safety in an informed manner and to make sure the right safety measures are in place to safeguard employees and the neighbourhood.

It is crucial to remember that a person's unique job responsibilities and the level of access required to carry out those duties should determine who has access to PSM documents. If it's necessary for them to carry out their duties, some production associates might have access to particular PSM documents.

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Between A and B

The highest probability is that A and B are solids and they are forming liquid or gases.

Between A and C

Highest probability is that A and C are gases and they are turning into liquid or solid

250 grams of Mix A (MxA) should be used to obtain the right diet for one animal.

To determine the number of grams of Mix A (MxA) needed to obtain the right diet for one animal, let's assume that x represents the number of grams of MxA used.

The protein content in MxA is 10%, which means 0.10x grams of protein will be obtained from MxA.

The fat content in MxA is 6%, which means 0.06x grams of fat will be obtained from MxA.

Since the desired diet for one animal should consist of 25 grams of protein and 5 grams of fat, we can set up the following equation based on the protein content:

0.10x = 25

Solving for x:

x = 25 / 0.10

x = 250 grams.

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Answer:

You are not supposed t9 be cheating

Explanation:

Answer:

ΔT = 0.116 °C

Explanation:

Using Formula

Q = mc ΔT

Where Q = 0.360, c = 4.184 and m = 0.7402

ΔT = Q/mc

ΔT = 0.360/ (4.184)(0.7402)

ΔT = 0.360 / 3.097

ΔT = 0.116 °C

So, The change in Temperature/Increase in Temperature is 0.116 °C

Answer:

b

Explanation:

trust

Answer:

B

Explanation:

The molecular mass of glucose is 180 g. To make 1 M solution of glucose , you should dissolve 1 mole of glucose in 1 litre of water.

The molecular mass of glucose is 180.16 g/mole, therefore 1 mole is 180.16 grams.

So, to make a 1 M solution, you should take 1 mole = 180.16 g of glucose and make up to 1 litre.

Working glucose solution is prepared by diluting the stock solution.

It can also be said that 1 M glucose solution is  -

                       1 M glucose solution = 180 g / 1000 m L

                                                          = 0.18.

So, it is 0.18 % w/v.  

Glucose solution is a mixture of glucose and water. It is used to treat low blood sugar and the water loss without the electrolyte loss. Glucose solution is an isosmotic solution. If it is in large amount, it produces hypertonic effects on the system.

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Answer:

(i) specific heat

(ii) latent heat of vaporization

(iii) latent heat of fusion

Explanation:

i. Q = mcΔT; identify c.

Here, Q is heat, m is the mass, c is the specific heat and ΔT is the change in temperature.

The amount of heat required to raise the temperature of substance of mass 1 kg by 1 degree C is known as the specific heat.  

ii. Q = mLvapor; identify Lvapor

Here, Q is the heat, m is the mass and L is the latent heat of vaporization.

The amount of heat required to convert the 1 kg liquid into 1 kg vapor at constant temperature.  

iii. Q = mLfusion; identify Lfusion

Here, Q is the heat, m is the mass and L is the latent heat of fusion.  

Here, Q is the heat, m is the mass and L is the latent heat of vaporization.

The amount of heat required to convert the 1 kg solid  into 1 kg liquid at constant temperature.  

(i) c is the molar heat capacity of the substance.

(ii) Lvapor is the latent heat of evaporation of the substance

(iii) Lfusion is the latent heat of fusion of the substance

All the 3 equations fall under Calorimetry.

In all the equation Q is the amount of heat required.

(i) First equation represents the amount of heat required to raise the temperature of a substance of mass m.

                          Q = mcΔT

       here c is the molar heat capacity of the substance and ΔT is the chnage in temperature.

(ii) Second equation represents the amount of heat required to convert a substance of mass m from liquid phase to vapour phase.

                          Q = mLvapor

        here Lvapor is the latent heat of evaporation of the substance

during evaporation no change in temperature occurs.      

(iii) Third equation represents the amount of heat required to convert a substance of mass m from solid phase to liquid phase.

                          Q = mLfusion

        here Lfusion is the latent heat of fusion or melting of the substance

during fusion no change in temperature occurs.    

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Increasing [Ag+] should be done in the following order: Solution X, Solution Y, and Solution Z. saturated solution.

What is saturated solution?

A saturated solution is one in which, at a specific temperature and pressure, the maximum amount of solute has been dissolved. In other words, under those circumstances, no additional solute can be dissolved in the solvent.

.We must evaluate the solubility of silver compounds in each saturated solution in order to establish the sequence of increasing [Ag+] (silver ion concentration) for the solutions X, Y, and Z.

AgCl, followed by AgBr and AgI, has the lowest solubility product constant (Ksp) value, as can be seen from the table. The solubility of the molecule and the concentration of the corresponding ions in the solution decrease with decreasing Ksp values.

Based on this knowledge, we can arrange the answers in the following sequence, increasing [Ag+]:

Solution Z: AgI will produce the highest [Ag+] concentration since it is the most soluble of the three silver compounds.

Solution Y: Because AgBr is less soluble than AgI, Solution Y will have a lower [Ag+] concentration than Solution Z but a greater concentration than Solution X.

The lowest [Ag+] concentration among the solutions may be found in Solution X, which contains AgCl, which is the least soluble of the three silver compounds.

Therefore, increasing [Ag+] should be done in the following order: Solution X, Solution Y, and Solution Z.

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Answer:

V = 0.798 L

Explanation:

Hello there!

In this case, for this gas stoichiometry problem, we first need to compute the moles of carbon dioxide via stoichiometry and the molar mass of starting calcium carbonate:

\(3.56gCaCO_3*\frac{1molCaCO_3}{100gCaCO_3} *\frac{1molCO_2}{1molCaCO_3} =0.0356molCO_2\)

Next, we use the ideal gas equation for computing the volume, by bearing to mind that the STP conditions stand for a pressure of 1 atm and a temperature of 273.15 K:

\(PV=nRT\\\\V=\frac{nRT}{P}\\\\V=\frac{0.0356mol*0.08206\frac{atm*L}{mol*K}*273.15K}{1atm} \\\\V=0.798L\)

Best regards!

Answer:

omg

Explanation:

omg omg omg omg omg omg omg omg omg omg I can't either ehhhhhh

The half life is the time taken for only one of the half  of the radioactive substance to remain.

The half life is the time taken for only one of the half  of the radioactive substance to remain. We can see the half life by looking at the graph and observing the point at which the sample decreases to half its original number.

Since the half life of carbon-14 is 5700 years, after ten half lives, almost 60000 years has elapsed thus there is little or no carbon-14 left. As a result of this carbon-14 can not be used if the sample is over 60000 years old.

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Answer:

Option A. 52.00 amu

Explanation:

From the question given above, the following data were obtained:

Isotope A:

Mass of A = 49.946 amu

Abundance (A%) = 4.345%

Isotope B:

Mass of B = 51.941 amu

Abundance (B%) = 83.789%

Isotope C:

Mass of C = 52.941 amu

Abundance (C%) = 9.501%

Isotope D:

Mass of D = 53.939 amu

Abundance (D%) = 2.365%

Average atomic mass =.?

The average atomic mass of the unknown element can be obtained as follow:

Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] [(Mass of C × C%)/100] + [(Mass of D × D%)/100]

Average atomic mass = [(49.946 × 4.345)/100] + [(51.941 × 83.789)/100] + [(52.941 × 9.501)/100] + [(53.939 × 2.365)/100]

= 2.170 + 43.521 + 5.029 + 1.276

= 51.996 ≈ 52.00 amu

Therefore, the average atomic mass of the unknown element is 52.00 amu

The mass of (NH4) 2S in the solution is : Mass = 0.0600 mol × 60.08 g/mol = 3.60 g.

The given molarity and volume of the solution can be used to calculate the number of moles of ammonium sulfide (NH4)2S.Then, the number of moles can be converted to mass using the molar mass of (NH4)2S.Mass of ammonium sulfide (NH4)2S in 3.00 L of a 0.0200 M solution is given by : Mass = moles × molar mass.The number of moles of (NH4)2S can be found using the equation:Molarity = Number of moles / Volume.Rearranging this equation, we get:Number of moles = Molarity × Volume Number of moles of (NH4)2S = 0.0200 M × 3.00 L.Number of moles of (NH4)2S = 0.0600 mol.The molar mass of (NH4)2S can be calculated by summing the molar masses of ammonium (NH4) and sulfide (S) ions.Molar mass of (NH4)2S = (2 × Molar mass of NH4) + Molar mass of S= (2 × 14.01 g/mol) + 32.06 g/mol= 60.08 g/mol.

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Balanced complete ionic equation for the acid-base reaction is

HCHO₂ (aq) + KOH(aq) → KCHO₂(aq) + H₂O(l)

Ionic equation is a chemical equation in which the electrolytes in aqueous solution are expressed as dissociated ions

Here given equation is

HCHO₂ (aq) + KOH(aq) →

Then we have to complete this equation to write the product then

HCHO₂ (aq) + KOH(aq) →  KCHO₂(aq) + H₂O(l)

Then break all the electrolyte into the ion

H⁺ + CHO₂⁻ + K⁺ + OH⁻→ K⁺ + CHO₂⁻ + H₂O

Then cancel the spectator ion on both side then

CHO₂⁻ and  K⁺

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The number of molecules of nitrogen will be the same as the number of molecules of hydrogen. The correct option is C.

The law states that different gases of the same volume stored at the same temperature and pressure will contain the same number of molecules.

Going by Avogadro's law, 500 ml of nitrogen and 500 ml of hydrogen kept together in one vessel at the same constant temperature and pressure will have the same number of molecules.

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Sulfur dioxide (SO2) is a corrosive gas often associated with industrial smog from burning coal.

Sulfur dioxide (SO2) is a corrosive gas that is frequently linked to industrial smog, particularly resulting from the combustion of coal. When coal is burned, it releases sulfur compounds present within it, primarily in the form of sulfur dioxide. This gas is known for its pungent odor and can have detrimental effects on both human health and the environment.

In industrial areas where coal-fired power plants, factories, and other coal-burning operations are prevalent, the emissions of sulfur dioxide can contribute to the formation of smog. Industrial smog, also known as "gray smog," is characterized by a thick haze of pollutants in the atmosphere. It consists of a mixture of sulfur dioxide, particulate matter, and other pollutants, creating a visible and often noxious air pollution.

Sulfur dioxide itself is highly reactive and can cause respiratory issues when inhaled. It irritates the respiratory system and can worsen existing conditions such as asthma or bronchitis. Prolonged exposure to high levels of sulfur dioxide can lead to more severe respiratory problems and even contribute to the development of respiratory diseases over time.

From an environmental perspective, sulfur dioxide is a significant contributor to acid rain. When released into the atmosphere, it reacts with water, oxygen, and other substances to form sulfuric acid. Acid rain, which results from the deposition of this acid onto the Earth's surface, can have detrimental effects on ecosystems, including damaging forests, bodies of water, and harming aquatic life.

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Answer:

\(n = 243.605\)

Explanation:

Given

\(P = 200atm\) -- Pressure

\(T = 300k\) --- Temperature

\(V = 30L\) --- Volume

Required

Determine the number of moles

This question will be solved using ideal gas law which states:

\(pV = nRT\)

Make n the subject:

\(n = \frac{pV}{RT}\)

Where

\(R = 0.0821 L\ atm/(mol\ K)\)

Substitute values for p, V, R and T in:

\(n = \frac{pV}{RT}\)

\(n = \frac{200 * 30}{0.0821 * 300}\)

\(n = \frac{6000}{24.63}\)

\(n = 243.605\) -- approximated

Hence, there are 243.605 moles

The concept molarity is an important method which is used to calculate the concentration of a solution. Here molarity - volume relation is used to find out the concentration of the sodium hydroxide solution.

The term molarity is defined as the number of moles of the solute present per lite of the solution. It is represented as 'M' and it is expressed in the unit mol / L.

The equation connecting molarity and volume is:

M₁V₁ = M₂V₂

M₂ = M₁V₁ / V₂

0.1 × 25 / 20 = 0.125 cm³

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Answer:

Sunlight provides the energy

Answer:  30 L

Explanation:  Use the combined gas law:  P1V1/T1 = P2V2/T2

We want V2, so rearrange:

V2 = V1(T2/T1)(P1/P2)

Note how I've grouped the temperature and pressure into ratios.  This allows us to cancle those units quickly and gives a perspective on what we should expect.  Enter the data:

V2 = (23L)*(0.6667)*(0.8571)

V2 = 29.6 L  30 L for 2 sig figs

The correct statement(s) about the process of boiling a pot of tap water are:

a. The water's change of state requires an increase in energy.

d. The water is undergoing evaporation.

When water is heated until it reaches its boiling point, it goes through a change of state from a liquid to a gas (water vapor), requiring an increase in energy. The intermolecular interactions binding the water molecules together must be broken during this phase change in order for them to escape into the gas phase.

d. The water is evaporating: Boiling is a particular kind of evaporation that takes place when a liquid's vapor pressure exceeds atmospheric pressure. Enough energy is gained by the water molecules at the surface to overcome intermolecular interactions and escape into the gas phase. Evaporation is the mechanism by which liquid water becomes water, and it takes place over time.

b. The assertion that "The water is undergoing sublimation" is untrue. Without transitioning via the liquid phase, the term "sublimation" describes the immediate change of state from a solid to a gas. Not from a solid to a gas, but from a liquid to a gas precisely, is what happens when something boils.

b. The assertion that "The water's change of state involves a loss of energy to the surroundings" is false. Water must be brought to a boil, not lost to the environment as energy. The heat energy given to the water raises its kinetic energy, enabling the molecules to defy intermolecular interactions and enter the gas phase.

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Answer:

Explanation:

This is going to be a very d-u-m-b question, but when you touch the Mg rod, why doesn't it kill you? After all, it is giving away a lot of electrons, isn't it?

The reason it doesn't kill you is because after the electrons are given away, they go into the liquid on the left side.

The important equation for this part of the reaction is

Mg ==> Mg2+ + 2e-

So the Mg goes from a solid to an ion (Mg2+) which goes into the liquid on the left.

The Mg must loose weight!!!!

Rounding to the nearest tenth, the bird's approximate height above the ground is 10.1 feet.

Given information,

Distance to the bird = 12ft

The angle of the elevation = 40°

Let's consider a right-angled triangle with the child's eyes as the observer at one vertex, the bird at another vertex, and the height of the bird above the ground as the unknown side (opposite the angle of elevation).

tan(angle) = height of bird/distance to the bird

tan(40°) = height of bird / 12 ft

height of bird = tan(40°) × 12 ft

The approximate value of tan(40°) is 0.8391.

height of bird ≈ 0.8391 × 12 ft ≈ 10.0692 ft

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Your question is incomplete, most probably the full question is this:

A child sees a bird in a tree. The child’s eyes are 4 feet above the ground and 12 feet from the bird. The child sees the bird at an angle of 40°. What is the bird's approximate height above the ground? Round to the nearest tenth.

Answer:

B

Explanation:

The pH indicator bromothymol blue is blue in alkaline solution and yellow in an acidic solution. A solution in which the color of the indicator is yellow is already acidic, hence, to change the color to blue would require that the pH of the solution is increased from acidic to basic.

Yeast cell and sugar placed in the solution will result in the fermentation and further increase the acidity of the solution.

Water plants under bright light in the solution will consume CO2 and photosynthesize, thereby reducing the acidity of the solution.

Algae placed in the solution and left in the dark room will increase the acidity of the solution as a result of further addition of CO2 through the respiration of the algae.

A person blowing air into the solution through a straw will further increase the acidity of the solution due to the CO2 content of the air blown.

Therefore, the only action that will likely reduce the acidity of the solution by increasing the pH and thus turn the color of the indicator from yellow to blue is the presence of water plants in the solution placed under a bright lamp.

Answer:

Each atom has electrons, particles that carry electric charges. Spinning like tops, the electrons circle the nucleus, or core, of an atom. Their movement generates an electric current and causes each electron to act like a microscopic magnet

Explanation:

trust me

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\ \)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{2.4 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{2.4}{6.02} \\ = 0.398671096...\)

We have the final answer as

Hope this helps you

All of the above statements are correct. The Total Maximum Daily Load (TMDL) program addresses both nutrient concentrations and nonuniform mixing of pollution.

The Total Maximum Daily Load (TMDL) program is an environmental management approach that aims to address water pollution and improve water quality. It considers both nutrient concentrations, such as phosphorus and nitrogen, and nonuniform mixing of pollutants within water bodies.

In the context of the TMDL program, markets for water quality problems refer to the trading of pollution credits. This means that entities, such as municipal sewage treatment plants, counties, industrial point sources, and brokers, can participate in the buying and selling of pollution credits to meet their regulatory requirements. This trading system allows for a more flexible and cost-effective approach to reducing pollution levels.

The statement that markets for water quality problems are more complex than for carbon dioxide emissions or fishery management is valid. Water quality problems involve diverse pollutants and sources, making the market dynamics more intricate compared to carbon dioxide emissions trading or fishery management.

Furthermore, negotiations within the TMDL program can be bilateral, involving direct agreements between two parties, or they can involve multiple parties. Negotiations often focus on determining fair and mutually beneficial exchanges of pollution credits.

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