The molar volume of a gas at STP, in liters, is

Answer:

Probably, 200 calories.

Explanation:

Answer:

2.5 g x 1 mol/18.02 g x 6.03 kJ/mol

Explanation:

use enthalpy of fusion for both thawing or freezing. The only difference for thawing or freezing would be that when freezing, energy is released (generated) and heat is on the product side, but when thawing , energy is consumed and it is on the reactant side. So for thawing or freezing use 6.03 kJ/mol.

Answer:

C) travel through solids and liquids

Explanation:

Though S waves can travel through solids, they cannot travel through liquids.

Answer:

16.93%.

Explanation:

∴ The mass of 1.0 mol of Fe₃Al₂(SiO₄)₃ = (no. of moles of Fe₃Al₂(SiO₄)₃)(the molecular mass of Fe₃Al₂(SiO₄)₃)

∴ The mass of 1.0 mol of Fe₃Al₂(SiO₄)₃ = (1)(the molecular mass of Fe₃Al₂(SiO₄)₃) = (the molecular mass of Fe₃Al₂(SiO₄)₃).

∴ The mass of 1.0 mol of Fe₃Al₂(SiO₄)₃ = 3(atomic weight of Fe) + 2(atomic weight of Al) + 3(molecular weight of (SiO₄)₃) = 497.7474 g.

The mass of Si in 1.0 mole of Fe₃Al₂(SiO₄)₃ = 3(atomic mass of Si) = 3(28.0855 g/mol) = 84.2565 g.

∵ The mass % of Si = (the mass of Si)/(the mass of Fe₃Al₂(SiO₄)₃) = (84.2565 g)/(497.7474 g) = 16.93%.

Answer:

16.7%

Explanation:

Answer:

.3044

q = mass x specific heat x (Tfinal-Tionitial)

q = -7500. Substitute and solve for Tfinal

Explanation:

Please mark brainliest and have a great day!

Answer:

56.699 kilograms

Explanation:

1 pound (lb) is equal to 0.45359237 kilograms (kg).

The mass m in kilograms (kg) is equal to the mass m in pounds (lb) times 0.45359237

Answer:

A

Explanation:

Answer:

Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent. It is measured in terms of the maximum amount of solute dissolved in a solvent at equilibrium. The resulting solution is called a saturated solution.

Explanation:

The solubility of a substance is the amount of substance that can dissolve in water (i.e solvent)

The solubility of a substance is the amount (either in mass or mole) of the substance (i.e solute) that can dissolve in a certain amount (either in litters or milliliters) of water (i.e solvent)

However, the solubility of substance is greatly influence by:

At a particular temperature and pressure, a substance may dissolve essentially well, while at other temperature, the solubility of the substance may be very low.

Thus, with the above information, we see that the solubility of substance is all about how the substance dissolve in water (i.e solvent) at a particular temperature and pressure.

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Answer:

D

Explanation:

D states a problem because of the population growing. Regulate means control and d stated that their was a problem and a need to control it. Therefore, d I'd really the only valid answer.

Final answer:

The need for population regulation is supported by the fact that a growing population intensifies environmental and social issues. Strategies like education and economic security can lead to lower birth rates, which is crucial for sustainable development and manageable population growth.

Explanation:

The statement supporting the need for population regulation is D) Billions more people on the Earth will intensify many environmental and social problems. This is because the carrying capacity of the Earth has been exceeded, leading to environmental degradation and resource depletion. Global efforts to curb population growth, such as China's one-child policy, have been both controversial and variably effective. Nonetheless, as the human population continues to increase, the pressures on food production, water resources, and global stability escalate, with the United Nations projecting potential population numbers ranging from 6 to 16 billion by 2100.

Population control is not just about reducing numbers; it's also about ensuring sustainable development and equitable resource distribution, which are vital for economic stability and avoiding social strife. Education, particularly for women, and the provision of economic security are recognized strategies that naturally lead to lower birth rates, thereby assisting in the management of population growth without the need for coercive policies.

Answer: Option (4)

Explanation: The most efficient radioactive method used for the determination of fossil age which is about one billion years old is the Potassium-Argon method (⁴⁰K-⁴⁰Ar).

Potassium-Argon method is generally used to date fossils which are more than 1.2 billion years old as its half life is almost about 1.2 billion years. Potassium is highly radioactive, which converts into Argon and becomes stable.

Uranium and Carbon are also highly radioactive whereas Lead and Nitrogen are stable elements.

¹⁴C-¹⁴N is not an efficient method as it has a half life of only about 5700 years.

Thus the correct answer is option (4).

Answer:

The answer is D) potassium, which is radioactive, and argon, which is stable

Explanation:

If you need any help with this question, please ask me! :)

Answer : The formula unit of compound will be, [tex]PbO_2[/tex]

Explanation :

As we know that one atom of oxygen contains (2-) charge and one atom of lead contains (4+) charge. So, to balance the of charges of lead, the 2 oxygen atoms combine with the 1 lead atom. Thus, the compound formed will be, [tex]PbO_2[/tex].

That means, when [tex]Pb^{4+}[/tex] combine with oxygen that is, [tex]O^{2-}[/tex], it gives [tex]PbO_2[/tex] by the criss-cross method.

Criss cross method : It is a method of determining the chemical formula.

The formula unit is a shown below.

Answer:

Pb02

Explanation:

guy above was correct i just took my test

Answer:

Only some of the molecules of a weak base dissociate to produce hydroxide ions when mixed with water, but all of the molecules of a strong base dissociate to produce hydroxide ions.

Explanation:

Only some of the molecules of a weak base dissociate to produce hydroxide ions when mixed with water, but all of the molecules of a strong base dissociate to produce hydroxide ions.

Weak bases only partially dissociate in water, while strong bases fully dissociate. Strong bases produce more hydroxide ions, and they can react with acids to produce water.

The difference between a weak and a strong base lies in their ability to dissociate and produce hydroxide ions when mixed with water. Only some of the molecules of a weak base dissociate to produce hydroxide ions, while all of the molecules of a strong base dissociate to produce hydroxide ions. This means that a strong base has a higher concentration of hydroxide ions compared to a weak base. Additionally, strong bases react with acids to produce water, while weak bases do not react at all.

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Hyy mate......

Here is your answer ......

1️⃣Name: Oxygen

2️⃣State : non-metal

3️⃣Family:Oxide

4️⃣Protons: 8

Electron:8

Neutron: 8

Hope it will help you...

Thanks for asking....

Answer:

0.019 g.

Explanation:

where, P is the pressure of the gas in atm (P = 1.02 atm).

V is the volume of the gas in L (V = 15.0 L).

n is the no. of moles of the gas in mol (n = ??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 28°C + 273 = 301.0 K).

∴ n = PV/RT = (1.02 atm)(15.0 L)/(0.0821 L.atm/mol.K)(301.0 K) = 0.62 mol.

no. of moles = mass/molar mass.

∴ mass of oxygen = (no. of moles)(molar mass) = (0.62 mol)(32.0 g/mol) = 0.019 g.

Answer:

SnCl₂·2 H₂O.

Explanation:

Relative atomic mass data from a modern periodic table:

How many moles of SnCl₂ formula units in this sample?

The first mass 4.90 grams contain both the SnCl₂ formula units and a number of water molecules. Luckily, the mass of the dehydrated salt 4.10 grams contains only SnCl₂.

Formula mass of tin (II) chloride SnCl₂:

[tex]M(\rm SnCl_2) = 118.710 + 2\times 35.45 = 189.610\; g\cdot mol^{-1}[/tex].

Number of moles of tin (II) chloride SnCl₂ formula units in this sample:

[tex]\displaystyle n(\mathrm{SnCl_2}) = \frac{m}{M} = \rm \frac{4.10\; g}{189.610\; g\cdot mol^{-1}} = 0.0216233\; mol[/tex].

How many moles of water molecules H₂O in this sample?

Water of crystallization exist as H₂O molecules in typical hydrated salts. The molar mass of these molecules will be:

[tex]M(\rm H_2O) = 2\times 1.008 + 15.999 = 18.015\; g\cdot mol^{-1}[/tex].

The mass of water in the hydrated salt is the same as the mass that is lost when the water molecules are removed and the salt is dehydrated.

In other words,

[tex]\begin{aligned}m(\text{Water of Hydration})&=m(\text{Hydrated Sample}) - m(\text{Anhydrous Sample}) \\ & = \rm 4.90\; g - 4.10\; g \\ &= \rm 0.80\; g\end{aligned}[/tex].

[tex]\displaystyle n(\mathrm{H_2O}) = \frac{m}{M} = \rm \frac{0.80\; g}{18.015\; g\cdot mol^{-1}} = 0.0444074\; mol[/tex].

What's the coefficient in front of water in the formula of this hydrated salt? In other words, how many water molecules are there in the compound for each SnCl₂ formula unit?

[tex]\displaystyle \frac{n(\mathrm{H_2O})}{n(\mathrm{SnCl_2})} = 2.05 \approx 2[/tex].

There are approximately two water molecules for each SnCl₂ formula unit. The formula of this compound shall thus be [tex]\rm SnCl_2 \cdot 2H_2 O[/tex].

The correct chemical formula for the hydrated tin (II) chloride, given the mass change upon dehydration, is SnCl₂·2H₂O, reflecting that two water molecules are associated with each formula unit of the compound. Option A is correct.

To find the correct chemical formula for the hydrated tin (II) chloride (SnCl2), we begin by calculating the mass of water in the hydrate, which is obtained by subtracting the mass of the dehydrated compound (4.10 g) from the mass of the hydrated compound (4.90 g).

This gives us a mass of 0.80 g for the water. Next, we must calculate the moles of SnCl₂ and H₂O present. The molar mass of SnCl₂ is approximately 189.60 g/mol and that of H₂O is about 18.015 g/mol. The mass of SnCl₂ in the sample is 4.10 g, which equates to about 0.0216 moles of SnCl₂.

The mass of water is 0.80 g, which gives us approximately 0.0444 moles of water. The mole ratio of water to SnCl₂ is therefore 0.0444/0.0216, which simplifies to approximately 2. Therefore, the chemical formula that matches this hydration level is SnCl₂·2H₂O, indicating that each formula unit of tin (II) chloride is associated with two water molecules.

Hence, A. is the correct option.

The complete question is:

A sample of hydrated tin (II) chloride (SnCl₂) has a mass of 4.90 g. When it is dehydrated, it has a mass of 4.10 g. Which is the correct chemical formula for the hydrate?

A. SnCl₂•2H₂O    

B. SnCl₂•4H₂O    

C. SnCl₂•6H₂O

Answer:

45.03 mL.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

(V₁T₂) = (V₂T₁).

V₁ = 50.0 mL, T₁ = 119ºC + 273 = 392 K,

V₂ = ??? mL, ​T₂ = 80ºC + 273 = 353 K.

∴ V₂ = (V₁T₂)/(T₁) = (50.0 mL)(353 K)/(392 K) = 45.03 mL.

To find the final volume of a gas sample when cooled from 119ºC to 80.0ºC at constant pressure, we use Charles's Law, resulting in an approximate final volume of 45.0 mL.

To solve this, we use Charles's Law, which states that for a given mass of gas at constant pressure, the volume is directly proportional to its temperature in Kelvin.

First, convert the temperatures from Celsius to Kelvin:

Final temperature (T₂): 80.0ºC + 273.15 = 353.15 K

Using Charles's Law (V₁/T₁ = V₂/T₂):

Initial volume (V₁) = 50.0 mL

392.15 K / 50.0 mL = 353.15 K / V₂

Rearrange to solve for the final volume (V₂):

V₂ = (50.0 mL × 353.15 K) / 392.15 K

V₂ ≈ 45.0 mL

So, the final volume of the gas is approximately 45.0 mL.

Answer:

The volume will double, if the temperature of the gas is doubled as temperature and volume are directly proportional.

Answer:

If the Kelvin temperature of the gas is  doubled, the volume of the gas is doubled.

Explanation:

To calculate the final volume of the system, we use the equation given by Charles' Law.

This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]  (at constnat pressure)

where,

[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.

[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.

We are given:

[tex]T_2=2T_1[/tex]

[tex]V_2=?[/tex]

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

[tex]\frac{V_1}{T_1}=\frac{V_2}{2T_1}[/tex]

[tex]V_2=2V_1[/tex]

If the Kelvin temperature of the gas is  doubled, the volume of the gas is doubled.

Answer:

will shift to right

Explanation:

this will result in the formation of more product

According to Le Chatelier’s principle, when the concentration of reactants is doubled the equilibrium shifts to the right to favour the formation of products and the correct option is option 1.

Chemical equilibrium refers to the state of a system in which the concentration of the reactant and the concentration of the products do not change with time, and the system does not display any further change in properties.

It is the state of a reversible reaction where the rate of the forward reaction equals the rate of the reverse reaction. While a reaction is in equilibrium the concentration of the reactants and products are constant.

Therefore, According to Le Chatelier’s principle, when the concentration of reactants is doubled the equilibrium shifts to the right to favour the formation of products and the correct option is option 1.

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Answer:

B- A form of solid precipitation that forms when raindrops freeze

Explanation:

A form of solid precipitation that forms when raindrops freeze best describes sleet.

The study of chemicals and bonds is called chemistry. There are two types of elements and these are metals and nonmetals.

The correct answer is option B which is A form of solid precipitation that forms when raindrops freeze

Hence, A form of solid precipitation that forms when raindrops freeze best describes sleet.

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Answer:

hormones - the first choice

Answer:

hormones

Explanation:

Hormones are chemical signals secreted by the endocrine glands. Each cell has receptors for the hormone molecule. Hormone secreted in the blood binds to its specific receptor on the cell surface. After binding to its receptors hormones transfer signal to the interior of the cell. Hormones are responsible for the transduction of cell signal. A very common example of hormone is insulin.

Answer:

[tex]\boxed{\text{70 L}}[/tex]

Explanation:

We can use the Ideal Gas Law to solve this problem

pV = nRT

Data:

p = 1.1 atm

n = 3.2 mol

R = 0.082 16 L·atm·K⁻¹mol⁻¹

T = 295 K

Calculation:

[tex]\begin{array}{rcl}1.1V\text{ atm} & = & \text{3.2 mol} \times \text{0.082 06 L}\cdot\text{atm}\cdot\text{K}^{-1}\text{mol}^{-1} \times \text{295 K}\\1.1V & = & \text{77.5 L}\\\\V & = &\dfrac {\text{77.5 L}}{1.1}\\\\V & = & \text{70 L}\\\end{array}\\\text{The volume is }\boxed{\textbf{70 L}}[/tex]

The volume of 3.2 moles of chlorine gas at 295 K and 1.1 atm is calculated using the Ideal Gas Law and is approximately 69.89 liters.

The volume of 3.2 moles of chlorine gas (Cl2) at 295 K and 1.1 atm can be calculated using the Ideal Gas Law, which is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Firstly, let's rearrange the Ideal Gas Law to solve for V (volume):

V ={nRT}÷{P}

We plug in the values:

n = 3.2 moles

R = 0.0821 L atm / (mol K) (the ideal gas constant)

T = 295 K

P = 1.1 atm

So, the calculation is:

V = {3.2 × 0.0821 × 295}÷{1.1}

Calculation yields:

V ≈ 69.89 liters

Therefore, the volume of 3.2 moles of chlorine gas at 295 K and 1.1 atm is approximately 69.89 liters.

The identity of element 'y' can be determined through the periodic table of elements by identifying its atomic number. Additional data like atomic mass, electron configuration, and properties can also be useful in definitively identifying the element.

To determine the identity of element 'y', you would need to refer to the periodic table of elements, which organizes all known elements according to their atomic number (i.e., the number of protons in an atom of that element). For example, if element y has 8 protons, it is oxygen; if it has 79 protons, it is gold. If you have more specific data about element 'y', such as its atomic mass, electron configuration, chemical behavior, or physical properties, you can use this information in conjunction with the periodic table to identify the element.

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Answer:

Hi there!

The answer to this question is: True

Atoms make up an element

Answer:

True

Explanation:

Answer:

Approximately 56.8 liters.

Assumption: this gas is an ideal gas, and this change in temperature is an isobaric process.

Explanation:

Assume that the gas here acts like an ideal gas. Assume that this process is isobaric (in other words, pressure on the gas stays the same.) By Charles's Law, the volume of an ideal gas is proportional to its absolute temperature when its pressure is constant. In other words

[tex]\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1}[/tex],

where

Convert the temperatures to degrees Kelvins:

[tex]T_1 = \rm 25^{\circ}C = (25 + 273.15)\; K = 298.15\; K[/tex].

[tex]T_2 = \rm 35^{\circ}C = (35 + 273.15)\; K = 308.15\; K[/tex].

Apply Charles's Law to find the new volume of this gas:

[tex]\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1} = \rm 55\;L \times \frac{308.15\; K}{298.15\; K} = 56.8\; L[/tex].

Answer:

False

Explanation:

Calcium is an element that belongs to the second group on the periodic table. Calcium has a valency of two and would readily loose both electrons in order to achieve stability when forming bonds.

It has 20 electrons.

Calcium would favor ionic bonds when combining with other atoms and by the virtue of this, it would readily transfer its two outermost electrons. This would make its atom mimic that of Argon-18.

The correct information is given below:

Element:                                        Calcium(Ca)

Electron structure of atom:      1S²2S²2P⁶3S²3P⁶4S²

Electron structure of ion:         1S²2S²2P⁶3S²3P⁶

Net ionic charge:                                 +2

The assertion in the table is incorrect. A calcium ion has an electron configuration of 1s22s22p63s23p6 and a net ionic charge of +2, not +1.

The provided electron configuration of the calcium ion is not accurate. The given configuration for the element of calcium (1s22s22p63s23p64s2) represents a neutral calcium atom, not a charged ion. When calcium becomes an ion, it loses two electrons to achieve a stable electron configuration (1s2 2s2 2p6 3s2 3p6), resulting in a net ionic charge of +2 for calcium, not +1. The electron configuration of Calcium ion should therefore be 1s22s22p63s23p6.

So, the assertion that all columns for calcium are filled out correctly in the table is ultimately false. Calcium loses two electrons when it becomes an ion, and therefore has a net ionic charge of +2, not +1.

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Answer:

Ionic bonds hold charged particles in solid NaCl together, such that they are unable to move or conduct electricity.

Explanation:

Consider an electric current that flows through a conductor: charge moves in a uniform direction from one end of the conductor towards the other.

Thus, there are two conditions for a substance to conduct electricity:

A conductor of electricity shall meet both requirements.

Now, consider the structure of solid NaCl [tex]\rm NaCl\;(s)[/tex]. NaCl is an ionic compound. It contains an ocean of oppositely charged ions:

Ions carry charge. Thus, solid NaCl contains charged particles and satisfies the first condition.

Inside solid NaCl [tex]\rm NaCl\;(s)[/tex], electrostatic attractions ("ionic bonds") between the oppositely charged ions hold these ions in rigid ionic lattices. These ions are unable to move relative to each other. As a result, they cannot flow through the solid to conduct electricity. Under solid state, NaCl is unable to satisfy the second condition.

As a side note, melting NaCl into a liquid breaks the ionic bonds and free the ions from the lattice. Liquid NaCl is a conductor of electricity.

NaCl(s) does not conduct electricity because, in its solid state, the sodium and chloride ions are held in a fixed lattice structure and cannot move freely.

Electrical conductivity in a substance is dependent on the presence of charged particles that can move freely. In the case of sodium chloride (NaCl), which is an ionic compound, the structure is composed of sodium cations (Na^+) and chloride anions (Cl^-) arranged in a crystalline lattice. When NaCl is in the solid state, the ions are locked into place by strong electrostatic forces of attraction between the oppositely charged ions. These forces hold the ions in a rigid, three-dimensional array, preventing them from moving about freely.

For a material to conduct electricity, it must have mobile charge carriers. In metals, these charge carriers are delocalized electrons that can move throughout the metal. In ionic solutions or molten ionic compounds, the ions themselves are the charge carriers, and they can move when an electric field is applied. However, in solid NaCl, the ions are immobile due to the lattice structure, and thus, there are no free charge carriers to transport electric charge. As a result, solid NaCl does not conduct electricity.

When NaCl is dissolved in water or melted into a liquid, the ions are no longer fixed in place and can move freely. In this state, NaCl does conduct electricity because the ions can act as charge carriers, moving towards the electrodes of opposite charge under an applied electric field

Answer:

d

Explanation:

rubber barely conducts electricity

Answer:

D: Conductivity

Explanation:

Study Island

The amount of conductivity is the indicator of the number of ions in a solution, with higher ion concentrations leading to greater conductivity. This is crucial for predicting precipitation when solutions are mixed.

The indicator of the number of ions in solution is the amount of conductivity. This is because the concentration of ions in solution directly affects its conductivity. Strong electrolytes such as potassium nitrate (KNO3) will dissolve to form a high concentration of ions, leading to higher conductivity compared to weak electrolytes like acetic acid (CH3COOH), and especially non-electrolytes that do not form ions in solution. It is also worth noting that the temperature can affect conductivity, as higher temperatures increase the solubility of substances, potentially resulting in higher ion concentrations.

Understanding ion concentration is also essential in predicting whether a precipitate will form when two solutions are mixed. By calculating the ion product and comparing it to the solubility product constant (Ksp), chemists can determine the state of a solution (unsaturated, saturated, or supersaturated) and if a mixing of solutions will result in precipitation.

Answer:

C) Electrons orbit the nucleus of an atom.

Explanation: