Why the noble gases are found in small amounts in the earth's atmosphere?

Answer:

Trees can be planted, grown up and harvested for wood and other things. it can be maintained by properly watering them when they are young trees or during a drought.

Explanation:

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The acid associated with \(NH_3\) is \(NH_4^+\), with I- is HI, with \(SO_4^{2-}\) is \(HSO_4^-\), with Cl- is HCl, with OH- is \(H_2O\), and with F- is HF.

1. NH3: It is a base that accepts a hydrogen ion (H+) from an acid. \(NH_3 + H^+ --> NH_4^+\). The acid associated with \(NH_3\) is \(NH_4^+\).

2. I-:  is a base that accepts a hydrogen ion (H+) from an acid. \(I^- + H^+ --> HI\) . The acid associated with I- is HI.

3. \(SO_4^{2-}\) : is a base that accepts a hydrogen ion (H+) from an acid. \(SO_4^{2-} + H^+ --> HSO_4^-\). The acid associated with \(SO_4^{2-}\) is \(HSO_4^-\).

4. Cl-: is a base that accepts a hydrogen ion (H+) from an acid. Its conjugate acid is the species formed when Cl- accepts a hydrogen ion (H+). \(Cl^- + H^+ --> HCl\). The acid associated with Cl- is HCl.

5. OH-: It is a base that accepts a hydrogen ion (H+) from an acid. Its conjugate acid is the species formed when OH- accepts a hydrogen ion (H+). \(OH^- + H^+ --> H_2O\). The acid associated with OH- is \(H_2O\).

6. F-:  It is a base that accepts a hydrogen ion (H+) from an acid. \(F^- + H^+ --> HF\).  The acid associated with F- is HF.

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Answer:

It may seem sensible to use a very low temperature in order to maximise the yield of ammonia but lower temperatures reduce the rate of reaction.

Explanation:

The balanced equation for this reaction is:

CH3CH2CH2OH + C6H5N=C=O → CH3CH2CH2OC(=O)N(C6H5)CH3 + H2O

CH3CH2CH2OH + C6H5N=C=O → CH3CH2CH2OC(=O)N(C6H5)CH3 + H2O

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Answer:

The effective nuclear charge for a 2nd row electron in Sulfur is +8

Explanation:

Zeff = Z (# of protons) - S (# of shielded electrons)

Since there are 8 electrons in the first and second rows combined, there are 8 shielding electrons.

The number of protons in Sulfur is 16.

Therefore,

Zeff = 16 - 8

Zeff = 8

(It's been awhile, so I am not 100% sure)

The effective nuclear charge for a 2nd row electron in sulfur is 14.

Sulfur has 16 atomic number means 16 number of protons and we know that in the first shell or orbit 2 electrons are present which produces a shielding effect due to its fast motion.

Its 2s electrons are shielded only by the two 1s electrons, therefore the second row electron experience an effective nuclear charge i.e. Z effective = 16 − 2 = 14 so we can conclude that the effective nuclear charge for a 2nd row electron in sulfur is 14.

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Answer:

Hope it's correct

Explanation:

2 mol of C2H6 = 7 mol of O2

So 20 mol of C2H6 = ? (20/2)*7 = 70 mol

Answer:

The atoms of different elements vary in size and mass.

Explanation:

Therefore, Student C had the purest crystals and the correct product

Melting point determination is a useful technique for checking the purity and identity of the crystalline solid. The melting point of a compound is the temperature range where the solid changes to a liquid. The literature value for the melting point of a product is an important property to know, and it can be compared to the values obtained experimentally.

The melting point of the compound is an important factor in determining its purity. A pure compound has a sharp melting point, whereas an impure compound has a broad melting range that is lower than the pure melting point.

The student with the purest crystals and the correct product was Student C.

Student A's melting point range is too low, which indicates that the compound is impure.

The melting point range of Student B is too high, which indicates that the compound is impure.

The melting point range of Student D is close to the literature value, but it is still too broad, which indicates that the compound is impure.

Student C's melting point range is close to the literature value, and it is relatively sharp, which indicates that the compound is pure.

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The mass percentage of methane in the gaseous mixture of methane, ethane, and propane is approximately 43.5%.

The mass percentage of a gas in a mixture can be calculated by dividing the mass of the gas by the total mass of the mixture and then multiplying by 100%.

To calculate the mass of each gas, the ideal gas law, PV = nRT, can be used. Here, P is the partial pressure of the gas, V is the volume of the mixture, n is the number of moles of the gas, R is the ideal gas constant, and T is the temperature.

Assuming a constant temperature and volume, the number of moles of each gas can be determined from the partial pressures of the gases:

n_methane = (95 kPa * V) / (R * T)

n_ethane = (105 kPa * V) / (R * T)

n_propane = (50 kPa * V) / (R * T)

The mass of each gas can be calculated using the molar mass of the gas:

m_methane = n_methane * M_methane

m_ethane = n_ethane * M_ethane

m_propane = n_propane * M_propane

Where M is the molar mass of the gas. The molar mass of methane is 16.04 g/mol, the molar mass of ethane is 30.07 g/mol, and the molar mass of propane is 44.10 g/mol.

The total mass of the mixture can be calculated as the sum of the masses of each gas:

total mass = m_methane + m_ethane + m_propane

Finally, the mass percentage of methane in the mixture can be calculated as:

mass percentage of methane = (m_methane / total mass) * 100%

Approximating the values, the mass percentage of methane in the gaseous mixture of methane, ethane, and propane is approximately 43.5%.

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Tap water does contain some electrolytes, but not necessarily the most per unit of volume. The concentration of electrolytes in tap water varies depending on the source and treatment of the water.

Let's understand this in detail:

What are electrolytes?

Electrolytes are substances that conduct electricity when dissolved in water. These substances break down into ions in water and help regulate various bodily functions. Some common electrolytes include sodium, potassium, calcium, and magnesium.

What is tap water?

Tap water is the water that comes out of your tap at home or in public places. The local water utility treats and purifies this water before it reaches your tap. The treatment process can remove some of the naturally occurring electrolytes in the water.

Additionally, the concentration of electrolytes in tap water can vary depending on the source of the water.

Does tap water contain the most electrolytes dissolved per unit of volume?

No, tap water does not necessarily contain the most electrolytes per unit of volume. The concentration of electrolytes in tap water can vary depending on the source and treatment of the water. Other water sources, such as sports drinks and coconut water, may contain higher concentrations of electrolytes.

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Answer:

Becausee deep - water waves do not interact with the ocean bottom as they travel , their speed is independent of the water depth . But as waves enter shallow water , interaction with the bottom alters the waves . Wave speed decreases , wavelength shortens and wave height increases .

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answer: D

Here is a list of the most common ways to speed up a chemical reaction

Increase the temperature (reactions that absorb energy)

Decrease the temperature (Reactions that release energy)

Answer:

3.92 g/cm³

Explanation:

\(\frac{851}{217} \approx 3.92\)

An ionic salt, is more soluble in water

Polar substances  are generally more soluble in water compared to nonpolar substances. This is because water is a polar solvent, meaning that it has a partial positive charge on one end and a partial negative charge on the other end due to the asymmetric arrangement of its atoms.

Polar substances also have a partial positive and partial negative charge on different parts of their molecules, which allows them to interact with water molecules through electrostatic interactions,

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Answer:

B) Rubbing alcohol

Explanation:

It is a solution

Algae blooms are most often caused by eutrophication.

Algae blooms are are dense layers of tiny green plants that occur on the surface of lakes and other bodies of water when there is an overabundance of nutrients (primarily phosphorus) on which algae depend.

Algae species tend to proliferate in growth (bloom) in the presence of abundance nutrients. This abundance of nutrients is as a result of a process called eutrophication.

Eutrophication is the ecosystem's response to the addition of artificial or natural nutrients, mainly phosphates, through detergents, fertilizers, or sewage, to an aquatic system.

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Answer:

A banana ripening is a chemical change not only because it results in the darkening of the bananas skin, which is a change in color, but also because it changes the texture and taste of the banana on the inside to be softer and sometimes even sweeter!

Explanation:

As a rule of thumb Chemical change: change in color, state (liquid to gas) or is ireversible like burning something. Physical change: Ripping a peice a paper or blowing a balloon up where it can be changed back and isnt permanent.

The way will the energy be used after it will leaves the mitochondrion during the cellular respiration is the repairing parts of damaged tissue.

The energy from the food that we will be used after when it leaves the mitochondrion during the cellular respiration, and via this, the damaged cell will be repaired through the cellular respiration.

The Cellular respiration cane explained as the process by that the biological fuels will be oxidised in the presence of the inorganic electron acceptor, like as the oxygen. Therefore, during the cellular respiration is the repairing parts of the damaged tissue is the way energy be used.

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Answer: Based on the given graph, the concentration of D over time decreases faster than E increases. Therefore, the correct option is C.

Explanation:

The concentration of D decreases faster than E increases. The graph represents the reaction between D and E, which is shown as DE. As time goes on, the concentration of D decreases while the concentration of E increases. This indicates that D is being consumed in the reaction while E is being produced. However, it can be seen from the graph that the decrease in the concentration of D is steeper than the increase in the concentration of E.

Therefore, option C is correct.

The conservation of energy allows finding the relationship between pressure and temperature is:

Pressure is defined by the relationship between force and area of ​​application.

         P =\(\frac{F}{A}\)

Where P is the pressure, F is the force and A is the area.

In the case of alcohol in the gaseous state, the mechanical energy of the molecules is only kinetic energy, it is related to temperature by the Boltzmann equation.

             Em = K = \(\frac{3}{2}\) kT

            ½ m v² = 3/2 k T

              v² = \(\frac{3 k T}{m}\)  

Where m is the mass, v the velocity of the particles, k the Boltzmann constant and T the absolute temperature.

From this equation we see that as the temperature increases, the speed of the alcohol molecules also increases.

Using the relationship between the impulse and the change of momentum we can find the mean force.

               I = F t = Δp

Where I impulse, F is the force, t is the time, Δp is the change of momentum.

if we assume elastic collisions the amount of initial and final moment are equal.

               \(F = \frac{2p}{t} \\F = \frac{2m}{t} v\)

If we assume that the molecules go at a constant speed.

              v = d / t

              t = d / v

Let's substitute.

               \(F = \frac{2m}{d} v^2\)

We substitute in the pressure equation.

               P = 2m / Ad v²

                \(P = \frac{6k}{ A d} \ T\)

In conclusion using the conservation of energy we can find the relationship between pressure and temperature is:

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Answer:

independent variable is how it changes how it affects something else dependent variable is something being measured

Answer: An independent variable is the variable which is changed by the scientist also called the manipulated variable. The dependent variable is the result of the action of the independent variable. it is the factor that changes due to the independent variable. It is also known as the responding variable.

Explanation

Answer:

Explanation:

Here, we want to select an option that represents a chemical property of carbon

Let us take a look at the options;

a) This is a physical property that talks about the color of the gas at a certain temperature

b) This is a physical property that talks about the smell of the gas at a certain temperature

c) This is a physical property that talks about the weight in comparison to the same weight of air at that particular temperature

d) This is a chemical reaction as an entirely new substance will be formed

Answer:

Explanation:

Titration: titrate twice, the first time with an indicator to determine how much sodium hydroxide is needed to completely react with hydrochloric acid, and the second time without an indicator to prevent the contamination of the sodium chloride salt produced

Answer:

Density = (3.33kg or g)/cm³(since you didn't state the unit of the mass)

Explanation:

volume = length × breath × height

let's take it as,

length = 2.0cm

breath = 3.0 cm

height = 2.0 cm

mass = 40 kg or g (since you didn't state the unit of the mass)

volume = ?

volume = length × breath × height

volume = (2 × 3 × 2)cm

volume = 12 cm³

Density = mass /volume

40kg or g/12cm³

Density = (3.33kg or g)/cm³(since you didn't state the unit of the mass)

Answer:

Explanation:

11. Referencing your drawings, what happens to the space between particles as you go

Answer:

add x to 7 and divide by 3

Explanation:

easier formula

Answer:

Molecular formula is CaCl2 i.e. 1 atom of Ca and 2 atoms of Cl . Hence, molecular weight = 1 x 40 + 2 x 35.5 = 40 + 71 = 111 g / mol . But if you look at the weight online, it says 110.98 g / mol , which is close to 111

Explanation:

Hope this helped :)

The true statement about proportions in this context is that; "Proportions have cross products that are equal."

The term stoichiometry is umbrella term that encompasses all the calculatrions that are aimed at calculating the amount of substance using mass - volume relationships. Usually, stoichiometry makes use of proportions.

The true statement about proportions in this context is that; "Proportions have cross products that are equal."

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The change in G for water vaporization (if change in H vaporization of water (H2O) is 40.7 KJ/mol, and the change in S for vaporization of H2O is 109 J/mol*K ) at 350 K = -78.85 × 10³ J/mol.

To determine the change in G for water vaporization, use the equation:

ΔG = ΔH - TΔS

Where,

ΔH = 40.7 kJ/mol

ΔS = 109 J/mol*K

T = 350 K

To find the change in G for water vaporization at 350 K, we need to use the Gibbs free energy equation.

ΔG = ΔH - TΔS

ΔG = -40.7 × 10³ J/mol - (350 K × 109 J/mol*K)ΔG

= -40.7 × 10³ J/mol - 38.15 × 10³ J/mol

ΔG = -78.85 × 10³ J/mol

The change in G for water vaporization at 350 K is -78.85 × 10³ J/mol.

Another way to approach this would be to convert the values of ΔH and ΔS into Joules, then substitute them into the Gibbs free energy equation.

ΔH = 40.7 kJ/mol = 40.7 × 10³ J/mol

ΔS = 109 J/mol*K

T = 350 K

ΔG = ΔH - TΔS

ΔG = -40.7 × 10³ J/mol - (350 K × 109 J/mol*K)

ΔG = -40.7 × 10³ J/mol - 38.15 × 10³ J/molΔG

= -78.85 × 10³ J/mol

Therefore, the change in G for water vaporization at 350 K is -78.85 × 10^3 J/mol.

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If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .

Using the ideal gas law equation:

PV = nRT

n = (PV) / (RT)

= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)

= 42.71 moles

the balanced equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl -> \(ZnCl_{2}\)  + \(H_{2}\)

1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.

The molar mass of zinc is 65.38 g/mol.

Mass of zinc = moles of zinc * molar mass of zinc

= 42.71 moles * 65.38 g/mol

= 2796.96 g

Therefore, the mass of the zinc is 2796.96 grams.

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