A neutral atom has a mass number of 80 and has 45 neutrons. write its atomic symbol.

Answer:

Explanation:

To convert a temperature from degree Celsius to Kelvin add 273 to the value in degree Celsius

That's

K = 273 + °C

where

K is the temperature in Kelvin

°C is the temperature in degree Celsius

From the question we have

K = 273 + 133

We have the final answer as

Hope this helps you

Answer: B: a solvent

Explanation: I hope this helps!

Answer:

See below ~

Explanation:

Sea water has a high amount of salt present in it. The density of salt is higher than that of water. It dissolves in water, thereby increasing its density. Hence, this is why sea water has a higher density than tap water.

Answer:

sea water have high density and also they're moving from one side to another more than tap water

tap water have less density and also they're not moving ever they ain't move than sea water

A tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.

The liquid and water vapor establish equilibrium in a tightly sealed container but not in the drinking glass because in the tightly sealed jar, the water can't go into the atmosphere but in the drinking glass the water will evaporate.

So we can conclude that a tightly sealed jar will form liquid and water equilibrium but the drinking glass will not.

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Al2 (SO4)3 + H2 + H2SOy 2 Al mass = 1.105 g,

2 Al molar mass = 26.98 g/mol,

and 2 Al moles = 1.105 / 26.98 = 0.041 moles.

KOH concentration is 1.4 M.

KOH's volume is 52.2 mL, or 0.0522 L, and its moles are 1.4 x 0.0522, or 0.07308 moles.

2Al + 2 KOH + 4 H2SO4 + 22H2O2KAI concentration of H2SO4 = 9.0 M volume of H2SOy = 21.8 ml = 0.0218 L moles of H2SO4 = 9.0 X 0.0218 = 0.1962 moles (SO4).

Aluminum contains the fewest number of moles, 12 H2O + 3 H2.

Reagent is constrained by aluminum.

A 2 mole Al creates a 3 mole H2 from the aforementioned reaction. In other words, 0.041 moles of Al generate 0.041 x 1.5 moles of H2, or 0.0615 moles of H2.

H2 quantity equals moles times molar mass.

= 0.0615 x 2g

Amount of H₂ produced = 0.123g

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Answer: Feature of fats that makes them hydrophobic is -

Fats are mostly made of carbon and hydrogen which are nonpolar

Explanation: Fats are hydrophobic (repel water/ water haters) because of long hydrocarbon chains it consists of fatty acid and glycerol. The long carbon chains is attached to hydrogen and this C-H bond is non polar bond which repels water, this chain is considered to be hydrophobic.

This chain is not water soluble and hence considered as hydrophobic chain, making fats insoluble in water.

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The frequency of molecular collisions is directly proportional to the number of molecules and the temperature, and inversely proportional to the volume of the vessel and the mass of the molecules.

This means that increasing the number of molecules or the temperature will increase the frequency of collisions, while increasing the volume of the vessel or the mass of the molecules will decrease the frequency of collisions.

To calculate the frequency of molecular collisions per square centimeter of surface in a vessel containing nitrogen, we can use the following formula:

Frequency of collisions = (N/V) * √(8kT/πm)

Where N is the number of nitrogen molecules, V is the volume of the vessel, k is the Boltzmann constant, T is the temperature, and m is the mass of a nitrogen molecule.

Once we have the values for all of these variables, we can plug them into the formula and calculate the frequency of collisions. The result will be in units of collisions per square centimeter of surface per second.

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There are also 6 oxygen atoms in the products. This is because the products of the photosynthesis reaction include C6H12O6 (glucose) and 6O2 (oxygen gas). The glucose molecule contains 6 carbon, 12 hydrogen, and 6 oxygen atoms.

In the photosynthesis reaction, 6CO2 + 6H2O → C6H12O6 + 6O2, there are 18 oxygen atoms in the reactants.

Therefore, the total number of oxygen atoms in the products is 6. This is because oxygen gas is not bonded to anything else and is released into the atmosphere as a product of photosynthesis.

The reactants of photosynthesis, carbon dioxide (CO2) and water (H2O), are converted into glucose (C6H12O6) and oxygen (O2) gas. In this process, sunlight energy is converted into chemical energy that is stored in glucose, which is used by the plant for growth and other metabolic processes. Therefore, photosynthesis is a crucial process for life on earth.

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Answer:

Explanation:

a )

Zn = Zn²⁺ + 2e   ( oxidation reaction )

Fe³⁺ + 3e = Fe( s ) ( reduction reaction )

b )

[ Zn = Zn²⁺ + 2e ] x 3

[ Fe³⁺ + 3e = Fe( s ) ] x 2

-------------------------------------------------------------------

3 Zn + 2 Fe³⁺ + 6e = 3 Zn²⁺ + 2 Fe ( s ) + 6e

3 Zn + 2 Fe³⁺  = 3 Zn²⁺ + 2 Fe ( s )

The pOH of a 0.0375M HBr solution is approximately 12.574, and the corresponding answer choice is A. This value is obtained by considering the autoionization of water and calculating the hydroxide ion concentration.

To determine the pOH of a 0.0375 M hydrobromic acid (HBr) solution, we need to first find the hydroxide ion concentration ([OH-]). Since HBr is a strong acid, it dissociates completely in water, forming H+ ions and Br- ions. However, HBr is not a base, so there is no direct contribution of OH- ions from the acid itself. Instead, we need to consider the autoionization of water.

The autoionization of water involves the generation of H+ and OH- ions in equal amounts. At 25 degrees Celsius, the concentration of H+ and OH- ions in pure water is 1.0 x 10^-7 M each. In an acidic solution like HBr, the H+ concentration is significantly higher, but the OH- concentration will still be affected.

To calculate the OH- concentration, we can use the equation Kw = [H+][OH-] = 1.0 x 10^-14. Rearranging the equation, we find [OH-] = Kw / [H+].

Given that HBr is a strong acid, we can assume that it dissociates fully, resulting in [H+] = 0.0375 M. Plugging these values into the equation, we get [OH-] = (1.0 x 10^-14) / (0.0375).

Calculating this gives us [OH-] ≈ 2.67 x 10^-13 M.

Now that we have the [OH-] concentration, we can find the pOH using the formula pOH = -log[OH-]. Taking the negative logarithm, we get pOH ≈ -log(2.67 x 10^-13).

Calculating this value yields pOH ≈ 12.574.

Therefore, the correct answer is A. 12.574.

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pOH determination.

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Answer:

Overall equation:

PbCl2 + MgSO4 => PbSO4 + MgCl2

Products:

PbSO4 + MgCl2

PbSO4 is a white precipitate (solid)

Explanation:

The reaction between PbCl2 and MgSO4 yields PbSO4 and MgCl2. PbSO4 is evidenced by formation of a white precipitate in the product side. The white precipitate is therefore, PbSO4. MgCl2 Formed is in aqueous state.

PbCl2(aq) + MgSO4(aq) => PbSO4 (s) + MgCl2(aq)

Answer:

C and A are correct

Explanation:

did on edge

A supercontinent is balanced by a super ocean at the start of the tectonic plates cycle. The supercontinent slowly disintegrates due to plate movement. As a result, fragments are sent across the ocean and clash to create a new supercontinent.

Cooler portions of the Earth's crust were driven downward into the warmer upper mantle beginning roughly 4 billion years ago, eroding and weakening the surrounding crust.

The tectonic plates that divide the crust of the Earth are constantly moving and altering the terrain of the globe. The lithosphere, the planet's outer shell, is said to be separated into a number of plates that move across the planet's rocky innards and on top of its soft core, according to the theory of plate tectonics (mantle).

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When Compound A and Compound B are mixed, the eutectic temperature will be between 7.2°C and 18.7°C.

The eutectic temperature is the lowest temperature at which the mixture of two or more substances will melt or solidify. The temperature at which the eutectic mixture melts is lower than the melting points of the individual components.In this question, Compound A has a melting point of 18.7°C while Compound B has a melting point of 7.2°C. When the two compounds are mixed, the eutectic temperature will be between 7.2°C and 18.7°C.The eutectic temperature is calculated using the lever rule. The lever rule can be applied to determine the composition of the eutectic mixture. The composition of the eutectic mixture is the same as that of the solid that is in equilibrium with the mixture.The eutectic temperature is a very important parameter in materials science and metallurgy. It determines the properties of alloys and their applications. For example, the eutectic temperature of steel determines its ability to be forged and welded. In conclusion, when Compound A and Compound B are mixed, the eutectic temperature will be between 7.2°C and 18.7°C. The eutectic temperature is a very important parameter in materials science and metallurgy.

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Answer:

Initial volume of the container (V1) = 1.27 L (Approx)

Explanation:

Given:

Number of mol (n1) = 5.67 x 10⁻²

Number of mol (n2) = (5.67 +2.95) x 10⁻² = 8.62 x 10⁻²

New volume (V2) = 1.93 L

Find:

Initial volume of the container (V1)

Computation:

Using Avogadro's law

V1 / n1 = V2 / n2

V1 / 5.67 x 10⁻² = 1.93 / 8.62 x 10⁻²

V1 = 10.9431 / 8.62

Initial volume of the container (V1) = 1.2695

Initial volume of the container (V1) = 1.27 L (Approx)

Answer: 1.27 L

Explanation:

First, calculate the final number of moles of propane (n2) in the container.

n2 = n1 + nadded = 5.67 × 10^−2 mol + 2.95 × 10^−2 mol = 8.62 × 10^−2 mol

Rearrange Avogadro's law to solve for V1.

V1 = V2 × n1 / n2

Substitute the known values of n1, n2, and V2,

V1 = 1.93 L × 5.67 × 10^−2 mol / 8.62 × 10^−2 mol = 1.27 L

The mass of Hg in the sample is 17.1g.

One of the fundamental quantities in physics and the most fundamental feature of matter is mass. The quantity of matter in a body is referred to as its mass. The kilogram, the standard international unit of mass (kg). You can write the mass formula as follows:

Mass = Density × Volume

The water weighs 1400 g. And one night later, we grew by one. Therefore, multiplying X 12.2 by 1400 multiplied by a million. We therefore possess 0.01708 grammes of mercury. When converted to milligrams, this amount equals 17.1 milligrams of mercury.

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Answer:

One of the most important things we can do with heat is to use it to do work for us. A heat engine does exactly this—it makes use of the properties of thermodynamics to transform heat into work. Gasoline and diesel engines, jet engines, and steam turbines that generate electricity are all examples of heat engines.

The molecular number of HCl is 1. This is because HCl is a diatomic molecule, meaning it consists of two atoms. It is composed of one atom of hydrogen and one atom of chlorine.

The molecular number is the total number of atoms in a given molecule. In the case of HCl, the molecular number is simply the sum of the two atoms, which is 1. Molecular number is the number of atoms of each element in a molecule. It is also known as the empirical formula and is a representation of the simplest ratio of elements in a compound. In the case of HCl, the molecular number is 1, as it contains one atom of hydrogen and one atom of chlorine.

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Answer:

C

Explanation:

Weak acids dissociate only slightly in an aqueous solution. The majority of molecules remain undissociated.

In the context of a nation's economy, the terms "produce" and "source" can refer to two important aspects of economic activity: the goods and services that a country produces, and the resources that a country uses to produce those goods and services.

In the context of economics, "produce" refers to the goods and services that are created or manufactured within a country or region. These goods and services can include anything from food, clothing, and electronics to transportation services, health care, and education. The production of goods and services is an important part of economic activity, as it creates value and generates income and employment for individuals and businesses within a country. The level of production within a country can be measured using various economic indicators, such as gross domestic product (GDP), which is the total value of all goods and services produced within a country's borders in a given period of time.

Here,

Overall, the concepts of "produce" and "source" are closely related in the context of a nation's economy, as a country's ability to produce is often closely tied to its ability to source the resources it needs to sustain economic growth and development.

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Answer: false

Explanation:

Answer:

3.2 moles of H2SO4

Explanation:

We need to start with a balanced equation.  Lets assume the sulfuric acid is formed from sulfur dioxide and water.

   SO2 + H2O = H2SO4

This equation is balanced.  (Check it)

It tells us that 1 mole of SO2 will form 1 mole of H2SO4, if the reaction proceeds as planned.  That's a molar ratio of 1 to 1.  They are equal.  What moles we react, we should expect the same number of moles of product.  [And we need 1 mole of water at the same time]

So if we react 3.20 moles of sulfur dioxide, and keep out lab partner back, we'll obtain 3.2 moles of H2SO4.

Answer: When you add an electron to zinc, it needs some extra energy. This is because zinc atoms naturally don't like having an extra electron. The extra electron and the electrons already present in zinc repel each other due to their negative charges. So, you have to give some energy to the zinc atom to overcome this repulsion and make it accept the additional electron. Basically, energy input is required to make zinc accept an extra electron because the electron doesn't fit easily and needs some force to be added.

Explanation: hope this helps

Milk has a pH of roughly 6.60.

The following equation, pH = log [H+], which refers to the molar hydrogen ion concentration, gives the definition of pH. You'll see that to get pH, we must use the common (base 10) logarithm of the hydrogen ion concentration.

The formula for calculating pH is: pH = -log[H+]

where [H+] is the concentration of hydrogen ions (also known as hydronium ions) in moles per liter.

Given that the [H+] in a liter of milk is about 2.51 × 10–7, we can calculate the pH as follows:

pH = -log(2.51 × 10–7)

pH = -log(2.51) - log(10–7) (using the logarithmic rule that log(ab) = log(a) + log(b))

pH = -0.399 - (-7) (taking the negative logarithm of 2.51)

pH = 6.60

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Answer:

See explanation

Explanation:

Crystallization is a separation technique used to obtain pure crystals of a substance from an impure mixture of solid substances.

The impure solid is dissolved in an appropriate hot solvent. This hot solvent is able to effectively dissolve the solid. However, as the solution is allowed to cool, the pure solid separates out of the solution as crystals.

The solid is now filtered to obtain the pure solid. The solid is also washed and dried to remove any solvent contaminant.

To find ΔH°f of gaseous HCl (enthalpy of formation), we need to consider the given reactions and apply Hess's Law, which states that the overall enthalpy change for a reaction is equal to the sum of the enthalpy changes of its individual steps.

The first step involves the formation of ammonia (NH3) from nitrogen gas (N2) and hydrogen gas (H2): N2(g) + 3H2(g) → 2NH3(g) ΔH°rxn = -91.8 kJ (Reaction 1)

The second step is the formation of ammonium chloride (NH4Cl) from nitrogen gas (N2), hydrogen gas (H2), and chlorine gas (Cl2):

N2(g) + 4H2(g) + Cl2(g) → 2NH4Cl(s) ΔH°rxn = -628.8 kJ (Reaction 2)

The third step involves the reaction between ammonia (NH3) and hydrogen chloride (HCl) to form ammonium chloride (NH4Cl):

NH3(g) + HCl(g) → NH4Cl(s) ΔH°rxn = -176.2 kJ (Reaction 3)

Now, we can use these three reactions to determine the enthalpy of formation for gaseous HCl. By manipulating and combining the equations, we can cancel out the common compounds to obtain the desired reaction:

2NH4Cl(s) - 2NH3(g) - 2HCl(g) ΔH°f = ?

Adding Reaction 1 and Reaction 2, we get:

2NH3(g) + 2NH4Cl(s) - 2N2(g) - 8H2(g) - Cl2(g) ΔH°rxn = -720.6 kJ

Now, to cancel out ammonium chloride, we subtract Reaction 3:

2NH3(g) + 2NH4Cl(s) - 2N2(g) - 8H2(g) - Cl2(g) - 2NH4Cl(s) + 2NH3(g) + 2HCl(g) ΔH°f = -720.6 kJ - (-176.2 kJ)

Simplifying, we find: 2HCl(g) ΔH°f = -544.4 kJ .Therefore, the enthalpy of formation of gaseous HCl is -544.4 kJ.

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Answer:

1 grams 5.42*1036 is equal to 0.00017809058399464 mole.

Explanation:

This is assuming you mean 1036 not 10 to the power of 36.

The discrepancy between the recovery mass and the original mass can be caused by a variety of factors including loss of material during the experiment, impurities in the original sample, measurement errors and incomplete reaction.

In conclusion, there are several reasons that can cause a discrepancy between the recovery mass and the original mass.

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Answer:

You can find the volume of an irregular object by immersing it in water in a beaker or other container with volume markings, and by seeing how much the level goes up. You can use this relation backwards too -- if you know what material an object is made of, you can look up its density in a book. hOPE THIS HELPS! =)

Using Boyle's law, As pressure is decreased, the volume will increase.

Boyle's Law describes how pressure and volume relate when the temperature is constant.

P1V1 = P2V2

When temperature is kept constant in this equation, pressure and volume have an inverse relationship.

When the volume is reduced, molecules have less room to move and collide more frequently, which raises the pressure. If the volume is increased, the molecules have more room to move, collisions occur less frequently, and the pressure is reduced.

The combined gas law, however, governs the connection between the three quantities when temperature is included.

As the gas volume decreases, the molecules hit the walls more frequently, raising the pressure; conversely, as the volume grows, the molecules must travel farther to contact the walls, reducing the frequency with which they do so and raising the pressure.

According to Boyle's law, a gas's pressure tends to decrease as its volume rises.

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