help please lol I’m stuggling

Answer:

1.977 g/L

Nitrous oxide

Names

Molar mass 44.013 g/mol

Appearance colourless gas

Density 1.977 g/L (gas)

Melting point −90.86 °C (−131.55 °F; 182.29 K)

Answer:  3597 kJ of heat

Explanation:

According to ideal gas equation:

\(PV=nRT\)

P = pressure of gas = 5.00 atm

V = Volume of gas = 8.00 L

n = number of moles = ?

R = gas constant =\(0.0821Latm/Kmol\)

T =temperature =\(25.0^0C=(25.0+273)K=298K\)

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

\(n=\frac{5.00atm\times 8.00L}{0.0821 L atm/K mol\times 298K}=1.63moles\)

As it is given :

1 mole of propane produces = 2220 kJ of heat

Thus 1.63 moles of propane produces = \(\frac{2200}{1}\times 1.63=3597kJ\)

Thus 3597 kJ of heat is produced

Answer:

option a = Atoms are always in motion.

Explanation:

John Dalton gives atomic theory in 1808. The main postulates are following,

1 = All mater is composed of indivisible  particle called atom.

2 =The atoms of same element are identical, but differ from another element.

3 = The atoms of different elements are combine in fixed proportion and form compound.

4 = Atom can not be created nor destroyed.

5 = Atom is smallest part of an element that take part in chemical reaction.

From above Dalton theory postulates it can be seen that all options are correct except option A.

200ml of MgO require 0.5m/L of mass.

You must dissolve 40.00 g of sodium hydroxide pellets in 250 ml of distilled water to create 1MMgO  solution, and you must then dilute the solution to 1 litre. You can make 1M MgO  solution by weighing 19.95 g of MgO  pellets and dissolving them in 500 ml of distilled water.

Thus, we can state that 200 ml of a 0.400M solution has 3.2 g of MgO . Solvent and solute are combined to form a solution. The solute is the substance that is present in solution in a smaller amount, while the solvent is the is quite strongly present.

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The pressure produced when the temperature is raised to 327 °C assuming that the volume is held constant is 180 KPa.

The force that the gas applies to the container boundaries is known as the gas's pressure. Along the designated volume, the gas molecules move at random. They bump into the ground and each other throughout this movement. The impact of every individual gas molecule is too little and difficult to visualise.

Initial pressure (P₁) = 120 KPa

Initial temperature (T₁) = 127 °C = 127 + 273 = 400 K

New temperature (T₂) = 327 °C = 327 + 273 = 600 K

Volume = Constant

New pressure (P₂) = ?

P₁V₁ / T₁ = P₂V₂ / T₂

Volume = contant

P₁ / T₁ = P₂ / T₂

120 / 400 = P₂ / 600

Cross multiply

P₂ × 400 = 120 × 600

P₂ × 400 = 72000

Divide both sides by 288

P₂ = 72000 / 400

P₂ = 180 KPa

The pressure is 180 KPa.

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Volume of gas occupy if the temperature of the gas is changed is 529.6 litres

It is given that

Initial volume of gas = V1 = 482 liters

Initial temperature = T1 = 273 K

Final temperature = T2 = 273 + 27 = 300 K

Final volume = V2 = ?

Charles's Law states that the volume of a given mass of gas varies directly with the absolute temperature of the gas when pressure is kept constant. The absolute temperature is temperature measured with the Kelvin scale.

The relationship between volume and temperature is:

V1 / T1 = V2 / T2

where V1 and T1 are the initial volume and absolute temperature and V2 and T2 are the final volume and absolute temperature (the Kelvin temperature, not the Celsius temperature).

V1 / T1 = V2 / T2

482 litres/273 K = V2/300 K

V2 = 529.6 litres

Hence, Volume of gas occupy is 529.6 litres

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Answer:

Water purifiers keeps the fish tanks clearer for longer

Explanation:

Chlorine is really the main liquid used in extinguishers, which is why it works so well to put out tiny flames. It doesn't ignite at any temperature and is not flammable.

Dichromate extinguishers were abandoned in the 1950s because to the chemical's toxicity, which causes the nerves and major organs to be destroyed when exposed to large doses. A fire's heat can also transform CTC into hydrogen cyanide gas, a chemical agent that was occasionally used.

Get in connect with a licensed, professional rubbish disposal company to have this material removed. After combining it in or combining it with an explosive solution, burn the chemical in a thermal crematorium with an intake and scrubber;

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The higher the concentration of OH- ions, the more basic the solution becomes.Finally, a solution is considered to be neutral if the concentration of H+ ions and OH- ions are equal. In this case, the pH value of the solution is 7.

The concentration of hydrogen ions (H+) and hydroxide ions (OH-) determine whether a solution is acidic, basic or neutral. The pH scale ranges from 0 to 14. If the pH value of a solution is less than 7, it is acidic. If the pH value is greater than 7, it is basic. If the pH value is equal to 7, it is neutral.A solution is considered to be acidic if it has a higher concentration of H+ ions and a lower concentration of OH- ions. In an acidic solution, the concentration of H+ ions is greater than the concentration of OH- ions. The higher the concentration of H+ ions, the more acidic the solution becomes.On the other hand, a solution is considered to be basic if it has a lower concentration of H+ ions and a higher concentration of OH- ions. In a basic solution, the concentration of OH- ions is greater than the concentration of H+ ions. The higher the concentration of OH- ions, the more basic the solution becomes.Finally, a solution is considered to be neutral if the concentration of H+ ions and OH- ions are equal. In this case, the pH value of the solution is 7.
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Answer: Each element on the periodic table is listed in a box with its atomic symbol and atomic number. The element's full name and atomic mass is also sometimes indicated. The image below shows a typical entry for the element calcium. The number above the atomic symbol represents the atomic number.

The new pressure will be : 25 atm

Boyle's Law  

At a constant temperature, the gas volume is inversely proportional to the pressure applied  

\(\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}\)

P₁=15 atm

V₁=5 L

V₂= 3 L

\(\tt P_2=\dfrac{P_1.V_1}{V_2}\\\\P_1=\dfrac{15~atm\times 5~L}{3~L}\\\\P_1=\boxed{\bold{25~atm}}\)

The time required to decrease the initial concentration to 0.050 mol/L is 9.62 seconds.

To determine the time required for the second-order reaction to decrease the initial concentration to 0.050 mol/L, we can use the integrated rate law for a second-order reaction:

1/[A]t - 1/[A]0 = kt

Where [A]t is the final concentration, [A]0 is the initial concentration, k is the rate constant, and t is the time. Rearranging the equation, we have:

t = (1/kt) * (1/[A]t - 1/[A]0)

Plugging in the values, [A]t = 0.050 mol/L, [A]0 = 0.100 mol/L, and k = 2.6 × 10–2 L/mol·s, we can calculate the time required to be approximately 9.62 seconds.

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In this question, we need to find the value of pressure of a 15 grams sample of CO2 gas, and in order to find this value, we will be using the Ideal gas law formula, which is the following:

PV = nRT

Where:

P = pressure in atm

V = volume in liters, 20 Liters

n = number of moles

R = gas constant, 0.082

T = temperature in kelvin, 0°C = 273 K

The number of moles we need to find based on the mass in the question and based on the molar mass of CO2, 44g/mol:

44g = 1 mol

15g = x moles

44x = 15

x = 15/44

x = 0.34 moles of CO2 in 15 grams

Now we have the values to add to the formula:

P * 20 = 0.34 * 0.082 * 273

20P = 7.61

P = 7.61/20

P = 0.38 atm of pressure

The pressure will be 0.38 atm

Answer:

2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + 3 H₂(g)

Explanation:

Let's consider the unbalanced equation for the single replacement reaction between Al and H₂SO₄.

Al(s) + H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)

We will begin balancing S atoms by multiplying H₂SO₄ by 3.

Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)

Then, we balance Al atoms by multiplying Al by 2.

2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)

Finally, we get the balanced equation by multiplying H₂ by 3.

2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + 3 H₂(g)

Answer:

A group of cells working together is defined as a tissue and several tissues working together comprise an organ.

Explanation:

Answer:

320.23g of CH3OH.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

CO(g) + 2H2(g)—> CH3OH(l)

Next, we shall determine the masses of CO and H2 that reacted and the mass of CH3OH produced from the balanced equation. This is illustrated below below:

Molar mass of CO = 12 + 16 = 28g/mol

Mass of CO from the balanced equation = 1 x 28 = 28g

Molar mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 2 x 2= 4g

Molar mass of CH3OH = 12 + (3x1) + 16 + 1 = 32g/mol

Mass of CH3OH from the balanced equation = 1 x 32 = 32g

From the balanced equation above,

28g of CO reacted with 4g of H2 to produce 32g of CH3OH.

Next, we shall determine the the limiting reactant. This is illustrated below:

From the balanced equation above,

28g of CO reacted with 4g of H2.

280.2g of CO will react with =

(280.2 x 4)/28 = 40.03g of H2.

From the calculations made above, we can see that only 40.03g out of 50.5g of H2 is required to react completely with 280.2g of CO.

Therefore, CO is the limiting reactant and H2 is the excess reactant.

Finally, we shall determine the mass of methanol, CH3OH produced from the reaction.

In this case, the limiting reactant will be used because it will give the maximum yield of the reaction since all of it is used up in the reaction. The limiting reactant is CO and the mass of methanol, CH3OH produced can be obtained as follow:

From the balanced equation above,

28g of CO reacted to produce 32g of CH3OH.

Therefore, 280.2g of CO will react to produce = (280.2 x 32)/28 = 320.23g of CH3OH.

Therefore, 320.23g of CH3OH were produced from the reaction.

If the value of ΔG° is equal to 0, then the value of K or Kp is equal to 1 and the system is said to be in equilibrium.

A change in temperature occurs when heat flow increases or decreases the temperature. This changes the chemical equilibrium towards the products or the reactants. This can be identified by examining the reaction and determining whether it is an endothermic reaction or an exothermic reaction.

If the temperature is raised, the equilibrium constant decreases. If the forward reaction has an endothermic nature, the equilibrium constant increases. The equilibrium position also changes when the temperature is changed.

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Answer:

Ver explicación abajo

Explanation:

LA pregunta esta incompleta, pero logré conseguir un ejercicio muy parecido a este con datos similares, y la pregunta que falta como tal son estas:

"a) La cantidad de sal producida.

b)  Moléculas de hidrógeno obtenidas a 25 ºC y 740 mm Hg.

c)  El volumen de la disolución de ácido necesario para la reacción."

Asumiendo que estos son los datos faltantes, hay que ver como resolver por parte:

a) Cantidad de sal producida.

En este caso debemos plantear la reacción que se lleva a cabo. Es un mineral que tiene Zinc y reacciona con acido sulfurico, por tanto la reacción que se lleva a cabo en teoría es:

Zn + H₂SO₄ -----------> ZnSO₄ + H₂

Entonces, queremos saber la cantidad de ZnSO₄ que se formó.

Para eso, debemos calcular primero cuantos gramos de zinc hay originalmente en la muestra, que son los que reaccionaron para formar esta sal, y luego los moles para que por medio de estequiometría, calculemos los moles de la sal.

Para la masa de Zinc, sabemos que el mineral contiene 65% de zinc o 0,65 entonces:

mZn = 0,65 * 500 = 325 g

Calculamos los moles usando la masa molecular de Zinc que es 65,37 g/mol:

moles = 325 / 65,37 = 4.97 moles

Ahora bien, como la reacción de arriba está bien balanceada, podemos asuimr por estequiometría que la relación Zn / ZnSO₄ es 1:1, asi que los moles de Zn serán los mismos de la sal por tanto:

moles Zn = moles ZnSO₄ = 4,97 moles

Calculando la masa molecular de ZnSO₄:

MM ZnSO₄ = 65,37 + 32 + (16 * 4) = 161,37 g/mol

Finalmente la masa de la sal es:

m ZnSO₄ = 4,97 * 161,37

b) Moléculas de hidrógeno obtenidas

PAra este caso, ya tenemos los moles de Zn, y por estequiometría, todas las especies presentes están en relación 1:1, así que los moles de hidrógeno son los mismos de zinc. No es necesario el dato de temperatura y presión acá pues ya tenemos los moles.

Para conocer el número de moléculas, necesitamos el número de abogadro que es 6.02x10²³ por lo tanto las moléculas de hidrógeno:

Moléculas de hidrógeno = 6,02x10²³ * 4,97

c) Volúmen de ácido empleado

Finalmente para el ácido, como ya conocemos los moles empleados, podemos calcular la masa del ácido usando su peso molecular:

MM H₂SO₄ = (2*1) + 32 + (4*16) = 98 g/mol

m H₂SO₄ = 4,97 * 98 = 487,06 g

Ahora que ya sabemos su masa, solo calculamos la masa realmente usada (pues su %p/p es 96%) y con la densidad calculamos el volumen:

d = m/v

v = m/d

m H₂SO₄ (puro) = 487,96 * 0,96 = 467,58 g

El volumen será:

V = 467,58 g / 1,823

Espero que esto te sirva, o te ayude como impulso a tu ejercicio real.

Answer:

Neon is a noble gas, it is monoatomic in nature, which implies that it has only one atom present. If we compare neon with water, water has three atoms present, two hydrogen atoms and one oxygen atom. Hence water stores more energy than neon because it is polyatomic and contains chemical bonds.

Answer:

The three-point test

Explanation:

The three-point test refers to a ground test utilizing an auxiliary current electrode and an auxiliary potential electrode.

Role does lactase play in breaking apart the disaccharide lactose is lactase prevents too many disaccharide molecules from clumping together during chemical reactions

Lactose is a disaccharide consisting of 2 monosaccharides, glucose and galactose, linked together via a β-1→4 bond and hydrolysis of this bond requires a specific enzyme called lactase which digests lactose to its components allowing the uptake of glucose and galactose from the intestine

When we eat something containing lactose, an enzyme in the small intestine called lactase breaks it down into simpler sugar forms called glucose and galactose and this glucose and galactose are disaccharide and these simple sugars are then absorbed into the bloodstream and turned into energy

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Volume Measurement Laboratory Apparatus:

Graduated Cylinder: A cylindrical container with volume markings along its vertical axis, used for measuring liquid volumes with good accuracy.

Burette: A long, graduated tube with a stopcock at the bottom, used for precise measurement of volumes of liquids during titrations.

Pipette: A slender tube with a tapered tip used to transfer specific volumes of liquids accurately. Common types include volumetric pipettes and micropipettes.

Volumetric Flask: A flask with a precise volume marking, typically used for preparing solutions of known concentrations.

Mass Measurement Laboratory Apparatus:

Analytical Balance: A highly accurate balance used to measure the mass of solid samples or substances with high precision.

Top-loading Balance: A balance that measures the mass of larger samples or substances with slightly lower accuracy compared to an analytical balance.

Weighing Boat/Dish: A small container used to hold substances being weighed on a balance.

Weights: Standard weights of known mass used to calibrate and verify the accuracy of balances.

Fire Producers Laboratory Apparatus:

Bunsen Burner: A gas burner commonly used for heating, sterilization, and flame-related experiments.

Alcohol Burner/Spirit Burner: A small burner that uses alcohol as fuel to produce a controlled flame for heating applications.

Meker Burner: A type of gas burner that produces a hot, intense flame with multiple openings, commonly used in laboratory settings.

Safety Matches/Laboratory Matches: Matches designed to be more stable and resistant to accidental ignition, often used to light Bunsen burners and other flames safely.

It's important to note that when working with fire-producing laboratory apparatus, proper safety protocols, such as wearing protective equipment and handling flammable substances with caution, should always be followed to prevent accidents and ensure laboratory safety.

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Answer:

Tables and charts are both used to represent data. However, the manner and circumstances in which each is used, distinguishes them from one another. Tables represent facts and figures in a row and column format which makes the data easier and faster to read and compare. On the other hand, charts represent data in a more graphical manner which may include lines, bars and circles.

Explanation:

I Hope This Helps! ^^

Answer:

A pie chart is a graph in which a circle is divided into sectors, each of which represents a percentage of the overall. Its goal is to show percentages at a specific time in history. Pie charts, unlike bar and line graphs, do not illustrate changes over time. Tables sort the data rationally in a row-and-column format, much to spreadsheets. Tables are used to arrange information that is too detailed or complex to be fully described in a text, allowing the reader to see fast results. They can be used to highlight data trends or patterns, as well as to remove numeric data from a document to make it more readable.

Explanation:

:)

Unsaturated solution: a solution in which more solute can be dissolved.

Explanation:

Salt dissolved in water or even sugar dissolved in water is an unsaturated solution if the quantity of dissolved salt/sugar is below the saturation point.

unsaturated solution: a solution in which more solute can be dissolved.

Explanation:

A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the container.

Answer:

Lemonade is a special type of mixture called a solution. The ingredients in a solution cannot be separated by hand because of changes in the ingredients' physical properties. But evaporation can be used to separate some solutions. For example, if you heat a solution of sugar water for a while, the water will evaporate.

Explanation:

Hope this helps :)

Answer:

because it showed how the electron could orbit the nucleus without falling into it.

Answer:

D) Water

Explanation:

The solute is dissolved in the solvent. The solvent is normally the liquid in a solid-liquid solution.

Something that helps me remember this is that in salt water... salt is the solute. They both have a t. That is probably dumb but it helps me lol

but yeah... the answer is D) water

Answer:

water

Explanation:

study island

Tpr (temperature, pressure, and relief) valves must be set to discharge at a temperature no higher than 210°F.

Temperature can simply be defined as the degree of hotness or coldness of a body.

The instrument used for measuring temperature is thermometer

So therefore, Tpr (temperature, pressure, and relief) valves must be set to discharge at a temperature no higher than 210°F

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a. Water at the top of a potential waterfall:

Potential energy. The water possesses potential energy due to its position above the ground. When it falls, this potential energy is converted into kinetic energy as it gains speed.

b. Kicking a ball:

Kinetic energy. The ball is in motion, so it possesses kinetic energy.

c. The energy in a lump of coal:

Potential energy. The energy in a lump of coal is potential energy stored in its chemical bonds. When the coal is burned, this potential energy is released as heat and light.

d. A skier at the top of a hill:

Potential energy. The skier has potential energy due to their position at the top of the hill. As they move downhill, this potential energy is converted into kinetic energy.

e. The energy in your food:

Potential energy. The energy in food is potential energy stored in the chemical bonds of molecules such as carbohydrates, proteins, and fats. This energy is released when the food is metabolized and converted into usable forms by the body.

f. A tightly wound spring:

Potential energy. The spring is compressed or stretched, storing potential energy. When released, this potential energy is converted into kinetic energy as the spring returns to its original shape.

g. A car speeding down the freeway:

Kinetic energy. The car is in motion, so it possesses kinetic energy due to its velocity.

In summary, potential energy refers to stored energy due to an object's position or state, while kinetic energy refers to the energy of an object in motion.

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The quenching of proflavine fluorescence may vary with the concentration of different salts because they can interact differently with the proflavine molecule.

Some salts may form complexes with proflavine, which could quench its fluorescence more effectively, while others may not have a significant effect.

The most effective salt in quenching proflavine fluorescence would depend on the specific concentration range and type of salts being tested.

However, in general, salts that have a higher charge density or form stronger ionic interactions with the proflavine molecule may be more effective in quenching. For example, divalent or trivalent salts like calcium or aluminum may be more effective than monovalent salts like sodium or potassium.

The least effective salt in quenching proflavine fluorescence would likely be one that does not interact significantly with the proflavine molecule, such as an uncharged salt like glucose or sucrose.

The different effects of various salts on proflavine fluorescence quenching could be due to differences in their chemical properties, such as their charge density, size, and ability to form ionic interactions with the proflavine molecule.

Some salts may also interact more strongly with water molecules, which could affect the solvation of the proflavine molecule and its fluorescence properties.

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