Nitrogen is necessary for all living beings but can be quite difficult to obtain (excluding the consumption of meat). Why is nitrogen so unavailable to organisms?
a.Nitrogen is plentiful in soils, but does not dissolve easily in water
b.Nitrogen is scarce in soils, abundant in air, but most organisms can’t breathe it
c.Nitrogen occurs at very low levels in soil, air, or water
d.Nitrogen is abundant in air, but it is hard to break the bonds between nitrogen atoms

Answer:  glycolysis.

Explanation:

Glycolysis results in the formation of either lactic acid or ethanol

An unsaturated solution is the remedy. Potassium nitrate dissolves in water at thirty degrees Celsius at a rate of 45 grams per one hundred g of water.

Per the UK's health service, adults should take in roughly 3,500mg of potassium daily. A healthy person can eat at least seven and a half bananas before consuming the advised amount of potassium because the typical banana, weighing 125g, provides 450mg of potassium.

Potassium should be a priority in a person's diet. The following foods are good sources of potassium: dried apricots, lentils, zucchini, prunes, potatoes, kidney beans, & bananas. The greatest potassium is present in apricots.

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Elements in Group 2A (2) of the periodic table, also known as the alkaline earth metals, form ions with a charge of +2.

The Group 2A elements include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). These elements have two valence electrons in their outermost energy level. To achieve a stable electron configuration, they tend to lose these two electrons and form ions with a +2 charge.

For example:

Beryllium (Be) loses two electrons to form Be2+ ions.

Magnesium (Mg) loses two electrons to form Mg2+ ions.

Calcium (Ca) loses two electrons to form Ca2+ ions.

This trend holds true for all the elements in Group 2A, resulting in ions with a charge of +2.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of substance = 250 cm³

density = 4.259 g/cm³

We have

mass = 4.259 × 250

We have the final answer as

Hope this helps you

Answer:

It should be transferred to a Beaker to finish preparing the solution

Explanation:

NaNO₃ is sodium Nitrate. It is a salt that is soluble in water hence it's aqueous solution can be prepared by dissolving it in water.

A beaker is a laboratory glassware that is used for various functions; one of which includes the preparation of reagents or aqueous solutions of a compound. In the example narrated in the question, the measured NaNO₃ solid can be transferred to a 100 mL or 200 mL beaker and then added to it is the desired volume of water to make the solution 100 mL. This solution can then be stirred with a "glass rod"

Answer:

radio waves

Explanation:

the answer is simple, radio waves. it is radio waves because when you look at the diagram the waves below Radio are very long. if you look at the waves under gamma ray, they are very short. radio is the longest wave while gamma is the shortest. if you are still confused it also says longer wavelength and low frequency( meaning it is safe) right under the wavelength.

Ag,Cu,Mg,S are the answers...............

Answer:

silver-Ag

copper-Cu

magnesium-Mg

sulphur-S

Explanation:

The balanced ionic equation for the acid-base reaction between 2 CSOH (aqueous) and H2SO4 (aqueous) can be written as follows:

2 CSOH(aq) + H2SO4(aq) → 2 CSH(aq) + H2O(l) + SO4^2-(aq)

In this equation, CSOH represents a strong base, sodium hydroxide (NaOH), and H2SO4 represents a strong acid, sulfuric acid. When they react, the hydrogen ion (H^+) from H2SO4 combines with the hydroxide ion (OH^-) from CSOH to form water (H2O).

The remaining ions, sodium (Na+) and sulfate (SO4^2-), remain dissociated and appear as ions in the balanced equation. This equation represents a neutralization reaction where the acidic and basic components combine to form a salt (CSH) and water.

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Answer:

THE ANSWER IS ....BY TRAIN .....

Explanation:

We have a 63.9 g sample of calcium hydroxide. First we have to convert those grams into moles. To do that we have to use the molar mass of calcium hydroxide.

Calcium hydroxide = Ca(OH)₂

molar mass of Ca = 40.08 g/mol

molar mass of O = 16.00 g/mol

molar mass of H = 1.01 g/mol

molar mass of Ca(OH)₂ = 1 * 40.08 g/mol + 2 * 16.00 g/mol + 2 * 1.01 g/mol

molar mass of Ca(OH)₂ = 74.10 g/mol

mass of Ca(OH)₂ = 63.9 g

moles of Ca(OH)₂ = 63.9 g /(74.10 g/mol)

moles of Ca(OH)₂ = 0.862 moles

In 1 molecule of Ca we have 2 atoms of O. So in 1 mol of Ca(OH)₂ we will have 2 moles of O atoms.

1 mol of Ca(OH)₂ = 2 moles of O atoms

moles of O atoms = 0.862 moles of Ca(OH)₂ * 2 moles of O /1 mol of Ca(OH)₂

moles of O atoms = 1.724 moles

One mol is similar to a dozen. When we say that we need a dozen eggs we know that we need 12 eggs. If we want a mol of eggs, we want 6.022*10^23 eggs. So one mol of something is 6.022 * 10^23 of that.

1 mol of O atoms = 6.022 * 10^23 atoms

n° of O atoms = 1.724 moles * 6.022 * 10^23 atoms/1 mol

n° of O atoms = 1.04 * 10^24 atoms

Answer: In a 63.9 g sample of Ca(OH)₂ we have 1.04 *10^24 atoms of oxygen.

Speed in excess of 100 km/h, which is 208.8 km / h

Linear motion consists of 2: constant velocity motion with constant velocity and uniformly accelerated motion with constant acceleration  

• An equation of uniformly accelerated motion  

\(\large {\boxed {\bold {x=xo+vo.t+\frac {1} {2} at ^ 2}}}\)

vt = vo + at  

vt² = vo² + 2a (x-xo)  

x = distance on t  

vo / vi = initial speed  

vt / vf = speed on t / final speed  

a = acceleration  

I think it's not chemistry but physics

Δx = 290 m

vf = 0⇒stop

Δt = 10 s

We use the formula in the question

\(\tt \Delta x=\dfrac{1}{2}(vf+vi)\Delta t\\\\290=\dfrac{1}{2}(0+vi).10\\\\vi=58~m/s=\boxed{\bold{208.8~km/h}}\)

The pH of the C₆H₅COONa solution at 0.200 M is roughly 2.89, which is the same as response choice (d).

In water, C₆H₅COONa dissociates to form C₆H₅COO⁻ and Na⁺ ions,

C₆H₅COONa ⇌ C₆H₅COO⁻ + Na⁺

The C₆H₅COO⁻ ion can act as a weak base by accepting a proton from water. The Ka of benzoic acid, C₆H₅COOH, is 6.4 × 10⁻⁵. To calculate the pH of a 0.200 M solution of C₆H₅COONa, we need to consider the dissociation of C₆H₅COO⁻ in water. We can assume that the dissociation of water is negligible compared to the dissociation of C₆H₅COO⁻, so we can use the following equation to calculate the concentration of OH⁻ ions,

Kb = Kw/Ka = [OH⁻][C₆H₅COOH]/[C₆H₅COO⁻]

Since Kb × Ka = Kw, we can use the Kb value to calculate the OH⁻ concentration and then use the expression for Kw to calculate the H⁺ concentration and pH,

Kb = [OH⁻][C₆H₅COOH]/[C₆H₅COO⁻]

[OH⁻] = Kb[C₆H₅COO⁻]/[C₆H₅COOH]

= (1.0 × 10⁻¹⁴)/(6.4 × 10⁻⁵ × 0.200)

= 7.81 × 10⁻¹² M

Kw = [H⁺][OH⁻]

= 1.0 × 10⁻¹⁴

[H⁺] = Kw/[OH⁻]

= 1.28 × 10⁻³ M

pH = -log[H⁺]

pH = 2.89

Therefore, the pH of the 0.200 M solution of C₆H₅COONa is approximately 2.89, which corresponds to answer choice (d),

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Answer: Chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.

Explanation:

The final volume of the gas is approximately 57.242 mL.

To find the final volume of the gas, we can use the equation for work done by a gas at constant pressure:

Work = -PΔV

Where:

Work is the work done by the gas on its surroundings (given as 119.9 J),

P is the pressure of the gas (given as 783 torr), and

ΔV is the change in volume.

Since the pressure is constant, we can rearrange the equation to solve for ΔV:

ΔV = -Work / P

Plugging in the values:

ΔV = -119.9 J / (783 torr)

We need to convert the pressure from torr to atm to maintain consistent units:

ΔV = -119.9 J / (783 torr * (1 atm / 760 torr))

ΔV = -0.158 L

The negative sign indicates that work is done on the gas, causing it to expand. To find the final volume, we add the change in volume to the initial volume:

Final Volume = Initial Volume + ΔV

Final Volume = 57.4 mL + (-0.158 L)

Final Volume = 57.4 mL - 0.158 mL

Final Volume = 57.242 mL

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Answer:

See below ↓↓↓↓

Explanation:

1)

a)

b)

c)

d)

Explanation:

The reaction rate decreases with a decrease in temperature. Catalysts can lower the activation energy and increase the reaction rate without being consumed in the reaction. Differences in the inherent structures of reactants can lead to differences in reaction rates.

800cm x 6.45 s =51600 cm s will be the conversion value  after multiplying .

Unit conversion is a multi-step process that involves multiplication or division by a numerical factor to convert one unit into another form of unit .

Uses of conversion of unit -:

51600 cm s is the conversion value obtained after converting the units .

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the answer is cf that the answer

Oxygen and calcium react to generate calcium oxide. The chemical made of calcium and oxygen has the formula CaO. This reaction's chemical formula is 2Ca + O2 2CaO.

the eight types of chemical reactions that are most frequently encountered are: decomposition reaction, combination reaction, combustion reaction, single displacement reaction, double displacement reaction, precipitation reaction, and redox reaction.

The evolution of a gas, precipitate formation, color change, temperature change, and state change are significant aspects.

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1. Using the "octet rule," I will write the Lewis structures for the following molecules:

(a) CH₂Cl₂: H-Cl:C-H
                       |
                       Cl
(b) NCl₃: Cl
              |
         Cl-N-Cl
(c) CS₂:  O=C=S=O
(d) CH₃CHCHCH₃: CH₃-CH-CH-CH₃

2. For the bolded carbon atom in the molecule CH₃CHCHCH₃:
a) There are 3 areas of high electron density surrounding the indicated C (3 bonded atoms and 0 lone pairs).
b) The AXmEn notation for the C in this molecule is AX₃E₀, where m=3 and n=0.
c) The molecular geometry for the C in this molecule is trigonal planar.
d) The bond angles surrounding C are approximately 120 degrees.

3. Obeying the octet rule, nitric acid (HNO₃) has two resonance structures. They can be drawn as:

Resonance Structure 1: O=N-O-H
                                       ||
                                       O

Resonance Structure 2: O-N=O
                                        ||
                                     O-H

Let us learn more in detail.

1.
(a) CH₂Cl₂: Carbon is the central atom with two hydrogen atoms and two chlorine atoms attached. The Lewis structure would be:

Cl   H
|     |
C-H-C-Cl
|     |
H    Cl

(b) NCl₃: Nitrogen is the central atom with three chlorine atoms attached. The Lewis structure would be:

 Cl
 |
Cl-N-Cl
 |
 Cl

(c) CS₂: Carbon is the central atom with two sulfur atoms attached. The Lewis structure would be:
S=C=S

(d) CH₃CHCHCH₃: Carbon is the central atom with three methyl groups and one hydrogen atom attached. The Lewis structure would be:

H   H   H
|   |   |
H-C-C-C-H
|   |   |
H   H   CH₃


3. The two resonance structures for nitric acid HNO₃ would be:

     O-H       O
      |         |
H-O=N         O=N-O
      |         |
     O          O-H

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Answer:

Explanation:

your answer is 351.96 i not a 100 per sent right but that should be it

By determining the mole fractions of ethylene glycol and water in the solution, we can estimate the vapor pressure. Using the given molecular weights, we that the vapor pressure of the solution is approximately 675.19 mmHg.

To calculate the vapor pressure, we first need to determine the moles of ethylene glycol and water in the solution. The moles of water can be found by dividing the mass of water (698 g) by the molar mass of water (18.02 g/mol), resulting in 38.71 mol. Similarly, the moles of ethylene glycol can be calculated by dividing the mass of ethylene glycol (302 g) by its molar mass (62.07 g/mol), giving us 4.86 mol.

Next, we calculate the mole fractions of water and ethylene glycol in the solution. The mole fraction of water (\(X_{water}\)) is obtained by dividing the moles of water by the total moles in the solution (38.71 mol + 4.86 mol). This gives us \(X_{water}\) = 0.8887. The mole fraction of ethylene glycol (\(X_{ethylene \ glycol}\)) is calculated by subtracting \(X_{water}\) from 1, resulting in \(X_{ethylene \ glycol}\) = 0.1113.

According to Raoult's law, the vapor pressure of the solution is given by the sum of the partial pressures of each component, where the partial pressure is equal to the mole fraction multiplied by the vapor pressure of the pure substance. Since the vapor pressure of ethylene glycol is assumed to be negligible, we can simplify the equation to \(P_{total}\) = \(X_{water}\) ×\(P_{water}\).

Assuming the vapor pressure of pure water at the given temperature is 760 mmHg, we multiply \(X_{water}\) by \(P_{water}\) to find the vapor pressure of the solution. Thus, \(P_{total}\) = 0.8887 * 760 mmHg, resulting in \(P_{total}\) ≈ 675.19 mmHg.

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sorry I don't know 4one

i HOPE IT'S HELP

Answer:

true

Explanation:

its A

The above statement is considered to be correct and true.

The Occupational Safety and Health Administration (OSHA) is a federal agency that is saddled with the responsibility of assuring and ensuring a safe and healthy working conditions for an employee or group of employees by doing the following;

According to the Occupational Safety and Health Administration (OSHA), trainings on the adoption and application of safety precautions (tools) such as wearing a personal protective equipment (PPE); face masks (respirators), ear plugs, safety boots, gloves, helmet, etc., are very important and are essentially to be used by all employees (workers) while working in hazard prone environments or industries.  

However, when an employee fails to strictly adhere to the recommended OSHA safety precautions, he or she is more likely to sustain a work-related accident or injury from a fall. Thus, this would negatively affect (impact) the employee because it results in him or her being absent from work (time off) and requires some costs to pay for medicals (medical cost).

In conclusion, injuries from work related falls can affect employees by resulting in time off and medical cost.

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Answer:

Explanation:

7.) C

12.)N

13.) P

14.) L

16.)L

18.)N

19.)C

20.) L

The concentration of the following in milligrams per liter will be: 0.01000 M Ca₂⁺ = 400.8 mg/ L, 0.02000 M H₂SO₄ = 1966.56 mg/L, 1.000 M HCO₃ = 61010 mg/L, 0.02000 M SO₄² = 1920.12 mg/L.

To convert the concentration of a solution from moles per liter (M) to milligrams per liter (mg/L), we need to multiply the molar concentration by the molar mass of the solute in grams.

0.01000 M Ca²⁺: The molar mass of Ca₂⁺ is 40.08 g/mol, so the concentration in mg/L is 0.01000 M × 40.08 g/mol × 1000 mg/g = 400.8 mg/L

0.02000 M H₂SO₄: The molar mass of H₂SO₄ is 98.08 g/mol, so the concentration in mg/L is 0.02000 M × 98.08 g/mol × 1000 mg/g = 1966.56 mg/L

1.000 M HCO₃-: The molar mass of HCO₃⁻ is 61.01 g/mol, so the concentration in mg/L is 1.000 M × 61.01 g/mol × 1000 mg/g = 61010 mg/L

0.02000 M SO₄²⁻: The molar mass of SO₄²⁻ is 96.06 g/mol, so the concentration in mg/L is 0.02000 M × 96.06 g/mol × 1000 mg/g = 1920.12 mg/L

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Answer: They are called substances and mixtures

Explanation:

Answer:

pure substances and mixtures.

Explanation:

Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule.

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Answer: Burning fuels?

Explanation: I’m not very sure actually