Why is molality not temperature dependent while molarity is temperature dependent?.

Answer:

The graph which shows under what conditions of temperature and pressure distinct phases of matter occur is called phase diagram.

Answer:

The correct answer to this question is a prokaryotic cell.

Explanation:

Prokaryotes have circular DNA and a cell wall, whereas eukaryotes have their DNA packaged into chromosomes and may not have a cell wall (as is the case in animal cells).

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Answer:

A. physical change

b. physical change

c. chemical change

d. chemical change

The balanced chemical equations are as  follows:

14. C₂H₄ + 3 O₂ -> 2CO₂ + 2H₂O

15. 2NaHCO₃ -> Na₂CO₃ + H₂O + CO₂

16. 3Cl₂ + 2NaBr -> 2NaCl + Br₂

17. 3Na₂S + 2NaCl + 3H₂O -> 5NaCl + H₂S + 3O₂

Balanced equations are equations of chemical reactions that ensure that the law of conservation of mass is true.

In a balanced equation, the number of atoms of each element on both sides of the equation is equal.

The given chemical equations are balanced as follows;

14.  Place 3, 2, and 2 before O₂, CO₂, and H₂O respectively.

C₂H₄ + 3 O₂ -> 2 CO₂ + 2 H₂O

15. Place 2 in front of NaHCO₃.

2 NaHCO₃ -> Na₂CO₃ + H₂O + CO₂

16. Place 3, 2, and 2 in front of Cl₂, NaBr, and NaCl respectively.

3Cl₂ + 2NaBr -> 2NaCl + Br₂

17. Place 3, 2, 3, 5, and 3 in front of Na₂S, NaCl, H₂O, NaCl, and O₂ respectively.

3Na₂S + 2NaCl + 3H₂O -> 5NaCl + H₂S + 3O₂

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Answer:

Explanation:

About 3.5% of the weight of seawater is made up of dissolved salts because of the salinity, or salt concentration, of saltwater, which is 35 parts per thousand.

_________________

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Have a great day!

Answer:

the Caribbean

Explanation:

Hydrogen bonding between water molecules governs the unique properties of water, including high boiling and melting points, high heat capacity, density anomaly, and cohesive behavior.

Hydrogen bonding between molecules of water plays a crucial role in governing the unique properties of water. Here are some key aspects:

1. High boiling and melting points: Hydrogen bonding results in strong intermolecular forces, requiring more energy to break the bonds and change the state of water. This leads to water's relatively high boiling point and melting point compared to other compounds of similar molecular weight.

2. High specific heat capacity: Hydrogen bonds allow water to absorb and retain a significant amount of heat before its temperature increases. This property gives water a high specific heat capacity, making it an effective heat reservoir and allowing it to moderate temperature changes in its surroundings.

3. High heat of vaporization: Hydrogen bonding also contributes to water's high heat of vaporization. It requires a substantial amount of energy to break the hydrogen bonds and convert liquid water into water vapor. This property enables water to effectively cool down organisms and regulate temperature through evaporation.

4. Density anomaly: Water exhibits a density anomaly, where its solid form (ice) is less dense than its liquid form. This is due to the formation of an open hexagonal lattice in ice, resulting from the hydrogen bonding arrangement. The lower density of ice allows it to float on liquid water, which is essential for the survival of aquatic life.

5. Cohesion and surface tension: Hydrogen bonding causes water molecules to stick together, creating cohesion and high surface tension. This cohesive property allows water to form droplets, be drawn up through plant roots against gravity, and exhibit capillary action.

Overall, hydrogen bonding in water governs its physical properties, making it a versatile solvent, crucial for life, and responsible for various phenomena in nature.

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solids are similar to liquids in that both are condensed states, with particles that are far closer together than those of a gas. However, while liquids are fluid, solids are not. The particles of most solids are packed tightly together in an orderly arrangement. The motion of individual atoms, ions, or molecules in a solid is restricted to vibrational motion about a fixed point. Solids are almost completely incompressible and are the densest of the three states of matter.

If the sample of magnesium used in a lab was contaminated with another metal that doesn't react with hydrochloric acid, then the results obtained in the experiment would be affected.

This is because the data collected during the experiment would reflect the reaction between hydrochloric acid and the contaminated sample instead of pure magnesium. As a result, the following changes in results might have been observed:

1. The mass of the contaminated sample would be higher than the mass of pure magnesium.

2. The rate of reaction between the contaminated sample and hydrochloric acid would be slower than the reaction between pure magnesium and hydrochloric acid.

3. The volume of hydrogen gas collected from the reaction would be lower than the volume of hydrogen gas collected in the reaction between pure magnesium and hydrochloric acid.

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The concentration of Acetic Acid in the vinegar solution is 0.22736 mol/L.

To find the concentration of acetic acid in the vinegar solution we can use the following equation :

CH3COOH(aq) + NaOH(aq) → NaCH3COO(aq) + H2O(l)

Let's determine the number of moles of NaOH in the solution :

moles NaOH = Molarity × Volume = 0.35 mol/L × 0.03248 L = 0.011368 mol

The balanced chemical equation is used to find the number of moles of acetic acid present in the vinegar solution.

1 mole of NaOH reacts with 1 mole of CH3COOH.

The number of moles of acetic acid in the vinegar solution can be calculated as

moles CH3COOH = moles NaOH = 0.011368 mol

The molar concentration of the acetic acid in the vinegar solution is given by the expression :

concentration of CH3COOH = moles CH3COOH / Volume of vinegar solution in Liters

= 0.011368 mol / 0.0500 L = 0.22736 mol/L

Therefore, the concentration of Acetic Acid = 0.22736 mol/L.

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Answer:

37.84 Liters

Explanation:

(see picture)

when gas molecules collide (for example molecules of o2 or n2 in the air),  they don't  stick together due to their high thermal energy.

Because gas molecules are so small, the kinetic theory of gases assumes that every collision between them will be fully elastic. The energy and momenta of the molecules are conserved during collisions if the molecules are small. As a result, regardless of accidents, the temperature does not change.

Any collision in which there is no overall kinetic energy loss is said to be elastic. During an elastic collision, kinetic energy may be transmitted from one particle to another, but the combined energy of the colliding particles remains unchanged. Between gas particles, there are no forces of attraction or repulsion.

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The equilibrium mixture of 1/3 D-glucose and 2/3 D-glucose is a result of the isomerization reaction between the two forms of glucose.

Glucose exists in two different forms, D-glucose and L-glucose, which are mirror images of each other. In an isomerization reaction, a substance can be converted from one isomer to another. In the case of glucose, the equilibrium mixture of 1/3 D-glucose and 2/3 D-glucose is achieved through the isomerization reaction of the two forms.

During this reaction, some of the D-glucose is converted into L-glucose, and some of the L-glucose is converted into D-glucose until a state of equilibrium is reached. The equilibrium mixture is therefore composed of both forms of glucose, with a ratio of 1:2 for D-glucose to L-glucose.

The equilibrium mixture of 1/3 D-glucose and 2/3 D-glucose is achieved through the isomerization reaction between the two forms of glucose, resulting in an equilibrium mixture of both forms with a ratio of 1:2 for D-glucose to L-glucose.

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Explanation:

Changing the environment takes away habitats from animals and some nutrients plants need

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Yes, you can use the Beer's Law equation to calculate the unknown concentration of a cobalt nitrate solution. Beer's Law, also known as the Beer-Lambert Law, states that the absorbance of a solution is directly proportional to its concentration and the path length.

Mathematically, it is represented as A = εcl, where A is the absorbance, ε is the molar absorptivity, c is the concentration of the solution, and l is the path length.

In the case of cobalt nitrate, its red color indicates that it absorbs light in the visible spectrum. By measuring the absorbance of the solution at a specific wavelength where cobalt nitrate has a known molar absorptivity, you can determine the concentration of the unknown solution.

To apply Beer's Law, you would need a spectrophotometer to measure the absorbance of the cobalt nitrate solution. Additionally, you must have a set of known concentration samples, called calibration standards, to create a calibration curve. Plotting the absorbance values against the known concentrations, you can generate a linear relationship, which represents the Beer's Law equation for cobalt nitrate at the chosen wavelength.

With the established calibration curve, you can measure the absorbance of the unknown cobalt nitrate solution, locate its value on the curve, and determine its concentration. Thus, Beer's Law is a reliable and accurate method to calculate the unknown concentration of a cobalt nitrate solution.

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The gas-phase decomposition of SO2Cl2 is a first-order reaction, and the rate of the reaction is given by the equation: rate = k[SO2Cl2]

The half-life of a first-order reaction is given by the equation: T1/2 = 0.693/k (a) At 600 K, the half-life for the process is 2.3 x 105 s. To find the rate constant at this temperature, we can use the half-life equation to solve for k: T1/2 = 0.693/k ;2.3 x 105 s = 0.693/k ;k = 0.693 / 2.3 x 105 s = 3 x 10^-5 s-1 , (b) At 320 degree celcius  , the rate constant is 2.2 x 10^-5 s^-1. To find the half-life at this temperature, we can use the half-life equation and substitute in the given rate constant: T1/2 = 0.693/k;T1/2 = 0.693 / 2.2 x 10^-5 s-1 ;T1/2 = 3.15 x 10^4 s Therefore, the half-life of the reaction at 320 degree celcius is 3.15 x 10^4 seconds.

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This is defined as a chemical substance which can react with a base to form a salt in a reaction.

The appropriate acid suffixes and conditions is however correctly given above.

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Explanation:

Iron fillings are magnetic in nature so They get attracted by a magnet.

One is through sublimation, where the mixture is heated and iodine gets converted into gaseous form, leaving behind the iron fillings.

Answer:

no it is not a complete model

2.20 g (to 3 sig. figs.) the maximum mass of water that could be produced by the chemical reaction. round your answer to significant digits.

hexane is C6H14 or put another way, as in the question CH3(CH2)4CH3. Actually, it is incorrect as depicted in the question.Nonetheless..

2C6H14 + 19O2 ===> 12CO2 + 14H2O ... balanced equation

moled hexane present = 2.6 g x 1 mole/130 g = 0.02 moles

moles O2 present = 5.29 g x 1 mole/32 g = 0.165 moles

Which reactant is limiting? Hexane = 0.02/2 = 0.01; O2 = 0.165/19 = 0.0087

Thus O2 is limiting...

moles of H2O that can be produced =0.165 moles O2 x 14 H2O/19 CO2 = 0.122 moles H2O

Mass of water( H2O) = 0.122 moles x 18 gm/mole = 2.20 g (to 3 sig. figs.)

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Neutral ----> No Change

Basic ----> Colour will change to

blue

Acidic ----> No change

Neutral ----> No change

hope this will the right answer &

Please attach a photo of the table next time.

☆...hope this helps...☆

_♡_mashi_♡_

Answer:

Iconic, neutral, and cation

Explanation:

When a metal and a nonmetal react, the result is a(n) Ionic compound. Ratio of cat ions and anion depends on the ionic charge of each. All ionic compounds come together in the simplest ratio to make a  neutral formula unit and the cation  is always written first in the formula.

The ionic compounds are solids in crystalline form and these are formed by opposite charged ion packing,  formed by the reaction of metals react with non-metals.

Elements can either gain or lose electrons in order to achieve noble gas configuration and these formation of ions helps them gain stability, the structure of ionic compound depend on the relative sizes of the cations and anions.

Ionic compounds are salts, oxides, hydroxides, sulphides, and the inorganic compounds. Ionic solids are held together by the electrostatic attraction between the positive and negative ions.

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The buffered solution that would be more resistant to pH change when the strong acid or the strong base is added is the buffer b - acidic buffer.

The acidic buffer will be the most resistant to the pH change when the both of the concentrations of the acid and the base are equal. The Acid buffer contains the acidic pH and which is prepared by the mixing of the weak acid and its salt with the strong base.

The basic buffer has the basic pH and which is prepared by the mixing of the weak base and its salt with the strong acid. Therefore, the buffer will be more resistant to the change in the pH.

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This question is incomplete, the complete question is :

which buffered solution, buffer a or buffer b, would be more resistant to ph change when a strong acid or a strong base is added? justify your answer.

buffer a - basic buffer

buffer b - acidic buffer

If the reaction had been carried out with a lower grade of acetic acid and 95% ethanol, and therefore has some amount of water in the initial set-up of the reaction, in order to accurately calculate the Keq, it would be necessary to include the concentration of water in the Keq calculation.

The reaction was initiated with glacial (anhydrous) acetic acid and anhydrous ethyl alcohol (ethanol). The reaction could also work if it was initiated with a lower grade of acetic acid (80% m/m acetic acid in water) and 95% m/m ethanol, which are generally available in chemistry stockrooms. This indicates that the reaction can be carried out using partially concentrated acetic acid and ethanol.

The expression for equilibrium constant Keq is given by:\(Keq}}=\frac{[\text{products}]^\text{stoichiometric coefficient}}{[\text{reactants}]^\text{stoichiometric coefficient}}\)

The Keq depends on the concentrations of the species involved in the chemical reaction. When water is added to the reaction, the concentration of the acetic acid would drop. As a result, it would be necessary to modify the Keq calculation.

In the given case, if the reaction is carried out with a lower grade of acetic acid and 95% ethanol, which has some water in the initial set-up of the reaction, then we have to consider the dissociation of acetic acid in water:

CH3COOH + H2O ⇌ CH3COO- + H3O+

And the equilibrium constant expression for this reaction will be:

Keq = [CH3COO-][H3O+] / [CH3COOH][H2O]

Therefore, if the reaction is carried out with partially concentrated acetic acid and 95% ethanol, then it would be necessary to include the concentration of water in the Keq calculation.

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Answer:

B

Explanation:

because Mg is stronger than Al

Answer:

B

Explanation:

Density = mass / volume

66 grams / 10 cm = 6.6 g per cubic cm

The wooden artifact from the ancient tomb contains the 55% of the carbon-14 that is present in the living trees. The time was the artifact made is 4942.2 years.

The half life of the carbon - 12 = 5730 years

The decay model for the isotope is as :

N / No = e^-λt

The time constant for the carbon-14 is as :

λ = 5730 / ln 2

λ = 8266.6 years

The time of the artifact made is as :

The time for the artifact => ln (N / No) = -t / λ

The time for the artifact, t  =  - 8266.6 × ln 0.55

The time for the artifact, t  = 4942.2 years.

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Calcium is a exceptionally reactive steel that reacts violently in a much less way with water. When calcium reacts with water, it has a tendency to displace hydrogen from the water.

Along with this, it produces bubbles of hydrogen fueloline in addition to calcium hydroxide. Therefore, an appropriate choice to this query is (D) (iii) and (iv).This is a binary compound and it's far an ionic compound, that is polar ionic compounds which might be polar in nature need to be quite simply soluble in water, however this calcium sulfide is stated to be insoluble in water. So the motives for that is for an ionic compound, that is collar to be soluble.

The calcium carbonate will dissolve withinside the acid generating CO2 fueloline. It will now no longer dissolve in natural water.If CaS had been to dissolve, AH could be high-quality due to the fact the ion-dipole interactions are very vulnerable as compared to the ion-ion interactions being overcome.

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When 2.00 moles of N2 react with sufficient H2, the balanced chemical equation for the synthesis of ammonia (NH3) is N2(g) + 3H2(g) → 2NH3(g).

According to the stoichiometry of the reaction, 1 mole of N2 reacts with 3 moles of H2 to produce 2 moles of NH3. Since you have 2.00 moles of N2 reacting, you can use the mole ratio to determine the moles of NH3 produced:
(2 moles NH3 / 1 mole N2) × 2.00 moles N2 = 4.00 moles NH3,

So, when 2.00 moles of N2 react with sufficient H2, 4.00 moles of NH3 will be produced.

38.5 g is the mass of nitrogen.

generated moles of ammonia Chemical formula

N₂ + 3H₂ → 2NH₃

Number of nitrogen moles: Mass x molar mass equals number of moles 38.5 g/28 g/mol is the weight in moles.

1.375 mol is the number of moles.

The moles of ammonia and nitrogen from the balance chemical equation will now be compared.

 N₂ : NH₃ 1 : 2

1.375 : 2×1.375 = 2.75 mole..Thus, from 38.5 g of nitrogen, 2.75 moles of ammonia are created.

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Answer:

be careful to not hurt yourself

Answer: make sure the liquid is pointing away from the face

Explanation: