Glauber’s salt, Na2 SO4∙10H2 O(s), was used in the 17 th century as a laxative. Glauber’s salt losses waters of hydration according to the following equilibrium: Na2 SO4∙10H2 O(s) Na2 SO4 (s) + 10 H2 O(g) K = 4.08×10–25 at 25oC What is the partial pressure of water at 25oC in a closed container holding a sample of Glauber’s salt?

I have issue solving this because I don't know what to do for equilibrium constant equation when there is dot for the chemical equation.

Answer:

The three primary colors used when mixing dyes or paints are red, yellow, and blue. Other colors are often a mixture of these three colors. Try running a chromatography test again with non-primary-color markers, like purple, brown, and orange.

Explanation:

The compound from the list that will not be a strong electrolyte would be HF.

Electrolytes are chemical substances that conduct electricity in molten or aqueous forms.

Substances that conduct electricity in molten or aqueous forms can be grouped into two categories, namely:

Strong electrolytes completely dissociate into their respective component ions in molten or aqueous forms.  For example, HCl completely dissociates in aqueous forms as follows:

\(HCl (aq) --- > H^+ (aq) + Cl^- (aq)\)

On the other hand, weak electrolytes only partially ionize into their component ions in molten or aqueous forms. For example, HF will ionize in water only to a small extent because it is a weak acid. Only a few ions are present in the aqueous molten forms.

Thus, considering all the compounds given in the option, the one that would not be a strong electrolyte is HF.

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As mentioned, 684 g of lead would've been needed to produce 119 g of water.

The mass of a material or substance tells us how much matter makes up that thing or substance. Despite the possibility of using grams to describe strength training, the kilowatt (kg) is the primary SI mass measurement (g). To measure mass, you might employ a balance. The amount of material an item contains is significantly influenced by its mass. A picture's gravity may be estimated based on its density. Along with its gravity, an element's location is crucial. This means that weight is still used to represent force.

(119 g H₂O) / (18.01532 g H₂O/mol) x (1 mol Pb / 2 mol H₂O) x (207.21 g Pb/mol) = 684 g Pb

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Answer:

i think its 10 miles per hour

Answer:

C. can be turned on and off

Explanation:

An electromagnet becomes magnetic when it is part of a complete electric circuit. A switch is a part of an electric circuit that completes or break the circuit turning the circuit on and off.

(*) Sorry for my late answer but I hope this helps others that are looking for this.

I got 100%  ;)

Answer:

1.

Chemical: Aspirin

Plant: Willow tree bark

Disease: Used to reduce pain, fever, or inflammation

2.

Chemical: Digoxin

Plant: Flower, Digitalis lanata

Disease: Used to treat various heart conditions

The data collected by Leah and Paul supports Paul's opinion that matter can exist even when it is not visible.

Support is a term used to describe a range of services and resources offered to individuals in need. It can refer to providing help with practical tasks, such as helping someone to manage their finances or providing transport to medical appointments. It can also refer to providing emotional or social support. This could involve providing counselling or having regular conversations to help someone to feel understood and supported. Support can also refer to offering advice and guidance, or providing a safe space for someone to talk and express their feelings. In its broadest sense, support is about helping someone to have the best quality of life they can.

This is because the mass of the inflated bag is greater than the mass of the empty bag despite the fact that the volume of the inflated bag is much greater. This shows that the inflated bag contains air, which is matter, even though it cannot be seen.

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Answer:

An example is the formation of ATP, which is an endergonic process and is coupled to the dissipation of a proton gradient.

Explanation:

Hope this helped!

Answer:

These people painted mostly animals that they most likely hunted as a major source of food, and in doing so left behind evidence of their activities i think

Explanation:

If 100 s of heat is added to a system and 0.100 ks of work is done by the system, then the value of ΔE or DE (change in internal energy) is 200 J, which is in option A. This is as per the first rule of thermodynamics.

ΔE = Q - W

ΔE (change in internal energy)

Given that 100 J (joules) of heat is added to the system (Q = 100 J) and 0.100 kJ (kilojoules) of work is done by the system (W = -0.100 kJ), we need to ensure that the units are consistent.

Since 1 kJ = 1000 J, we can convert the work done to joules:

W = -0.100 kJ = -0.100 × 1000 J = -100 J

Now one can substitute the values into the equation:

ΔE = Q - W

= 100 J - (-100 J)

= 100 J + 100 J

= 200 J

Therefore, the value of ΔE (change in internal energy) is 200 J.

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complete question is below

if 100s of heat is added to a system and 0.100ks of work is done by the system, what is the value of DE​

A. 200 j

B.50 j

C.2 j

D. 10000j

Answer:

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 75 × 8

We have the final answer as

Hope this helps you

Answer:

B.) 6

Explanation:

Attached below is the Lewis structure of PCl₃ . Since phosphorus (P) has 5 valence electrons and chlorine (Cl) has 7 valence electrons, there should be 26 valence electrons (5 + 7(3) = 26) in the Lewis structure.

Bonding electrons are the electrons present in the chemical bonds between two atoms.

There are 2 electrons shared in every single bond. Within PCl₃, there are 3 single bonds. As such, there are 6 bonding electrons in the Lewis structure of PCl₃.

The heat required is to convert 75.0 g of C₂Cl₃F₃ from a liquid at 13.60 ∘C to a gas at 76.00 ∘C is 17.55 kJ.

To solve this problem, we need to consider the different steps involved in the process of converting 75.0 g of C₂Cl₃F₃ from a liquid at 13.60 ∘C to a gas at 76.00 ∘C;

Heating the liquid C₂Cl₃F₃ from 13.60 ∘C to its boiling point at 47.6 ∘C, Vaporizing the liquid C₂Cl₃F₃ at its boiling point, and heating the resulting gas from 47.6 ∘C to 76.00 ∘C

Now, we can use the equations to calculate the heat required for each step;

q₁ = m × C₁ × ΔT₁

where q₁ is the heat required, m is the mass of C₂Cl₃F₃, C₁ is the specific heat of C₂Cl₃F₃(l), and ΔT₁ is the temperature change from 13.60 ∘C to 47.6 ∘C.

q₁ = 75.0 g × 0.91 J/g⋅K × (47.6 ∘C - 13.60 ∘C)

= 2466 J

q₂ = n × ΔHvap

where q₂ is the heat required, n is the number of moles of C₂Cl₃F₃, and ΔHvap is the heat of vaporization of C₂Cl₃F₃.

n = m/M

= 75.0 g / 137.37 g/mol

= 0.5464 mol

q₂ = 0.5464 mol × 27.49 kJ/mol

= 15.038 kJ

q₃ = m × C₂ × ΔT₂

where q₃ is the heat required, m is the mass of C₂Cl₃F₃(g), C₂ is the specific heat of C₂Cl₃F₃(g), and ΔT₂ is the temperature change from 47.6 ∘C to 76.00 ∘C.

m = n × M

= 0.5464 mol × 137.37 g/mol

= 75.0 g

q₃ = 75.0 g × 0.67 J/g⋅K × (76.00 ∘C - 47.6 ∘C)

= 1446 J

The total heat required is the sum of the heats required for each step;

\(q_{total}\)= q₁ + q₂ + q₃

= 2466 J + 15.038 kJ + 1446 J

= 17.55 kJ

Therefore, the total heat required is 17.55 kJ.

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Answer:

2.4 H\(x^{2}\)

Explanation:

The two atoms are isotopes of each other are Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. The correct option is A.

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.

An isotope is one of two or more chemical elements that exist in different forms. Varied isotopes of an element share the same atomic number and protons in their nuclei, giving them the same atomic weight.

However, each elemental isotope has a different amount of neutrons, which changes its atomic weight.

They can be referred to as isotopes because Si, which has a mass number of 27 and an atomic number of 14, and Mg, which has a mass number of 25 and an atomic number of 12, both have 13 protons.

Thus, the correct option is A.

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Answer:

Option B. Heptane

Explanation:

To obtain the parent name of the above compound, all we need to do is to locate the longest continuous carbon chain.

The longest continuous carbon chain of the above compound is 7.

Next, we shall also consider the chain if there is any double or triple bond.

From the diagram given above, no double or triple bond is present.

Finally, the parent name of the compound is heptane since the longest continuous carbon chain is 7 and no double or triple bond is present in the compound.

The sample with the largest number of oxygen atoms will be calcium perchlorate.

Since we are not looking at the number of moles, the mass of the compounds has no bearing on the number of atoms of oxygen.

Therefore, the compound with the largest number of oxygen atoms is calcium perchlorate.

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The oxidation number of chlorine in KClO3 is +5 (option A).

The oxidation number of an element is the hypothetical charge of an atom within a molecule.

The oxidation number of an element like chlorine in a compound like Pottasium chlorate can be calculated as follows:

The oxidation number of the elements in KClO3 is as follows:

1 + x - 2(3) = 0

x - 5 = 0

x = +5

Therefore, the oxidation number of chlorine in KClO3 is +5.

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Answer:

Diamagnetic have paired electrons while paramagnetic have at least one unpaired electron.

Explanation:

F2, C2 and N2 are diamagnetic while O2 and B2 are paramagnetic. Diamagnetic are those atoms which have paired electrons while paramagnetic are those atoms which contain at least one unpaired electron so we can say that F2, C2 and N2 have paired electrons while O2 and B2 have unpaired electrons. When diamagnetic materials are allowed to contact with external magnetic field so they will be repelled while paramagnetic materials are attracted by magnetic field due to the presence of unpaired electrons.

Iron oxide (FeO) is the strongest paramagnetic material having the value of 720.

The half-life of Po-210 is 140 days. If the initial mass of the sample is 5 kg, 3.5g will remain after 280 days.

Chemical kinetics is a subfield of physical chemistry that studies the speeds of chemical processes. The rate of the reaction may be used to classify it as quick, moderate, or sluggish. Reaction mechanism also enables us to study the effects of temperature and catalyst on reaction rate and rate constant. It informs us about reaction processes and enables us to apply particular rate constants to certain mechanistic stages.

The rate law for first order kinetics is

K=(2.303/T)×log(a/a-x)

half life=0.693/K

Where

k - rate constant

t - time passed by the sample

a - initial amount of the reactant

a-x - amount left after the decay process

K=0.693/half life

K=0.693/140

=0.086

0.086=(2.303/ 280)×log( 5 /a-x)

0.086=0.07×log( 136/a-x)

1.22=log( 136/a-x)

136/a-x=16.5

a-x=3.5g

Therefore, 3.5g will be left after 280 days.

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Answer:

Example 1

palladium(II) nitrate,

Example 2

Metal catalysts such as Fe, Ni, Mo, and Co are routinely used in the manufacture of CNMs.

Explanation

The three metals used in catalytic converters — rhodium, platinum and palladium — are part of a category known as platinum group metals, or PGMs, which are known for their catalytic properties.

its True

Yes, burning of wood is an example of oxidation-reduction reaction.

hope it helps

Answer:

The sound playing from the first graph is louder, while the sound from the second graph is deeper, both of which have the same pitch.

Explanation:

First let's analyze the graphs,
Comparing the first graph to the second

Concluding from the above observations, the sound playing from the first graph is louder, while the sound from the second graph is deeper, both of which have the same pitch.

It is false because NaCl has a higher bond energy than Nal.

The melting point of a substance is determined by the strength of the intermolecular forces between its atoms or ions. In the case of NaCl, the strong electrostatic attraction between the positively charged Na+ ions and the negatively charged Cl- ions results in a relatively high melting point.

In contrast, NaI is a ionic compound with a lower bond energy between the atoms. So, it has lower melting point in comparision to NaCl. So the statement is False, NaCl has a higher melting point than NaI.

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Answer:

i think its D

Explanation:

In order to get maximum accuracy, student should take average of results from all four trials.

Accuracy  in terms of chemistry can be defined as to how close a measurement is to the true value.There are three types of accuracy:

1) Point accuracy-It means accuracy is present at that point of scale only.It does not give any information about the accuracy of the instrument.

2)Percentage of true value--It is the accuracy  which is determined by identifying accuracy of the instrument  and comparing it with the measured true value.

3)Percentage of scale range- It is the accuracy  which determines accuracy of the measurement.

Accuracy in case of instruments  is neglected up  to ±0.5 percent.Accuracy of measurements can be increased by taking multiple measurements and taking into account human errors.

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The conditions 0°C, and 1 atm pressure represents the STP state. The molar volume of any gas at STP is 22.414 L. The volume of oxygen is 13.04 L.

The volume occupied by one mole of a substance at a given temperature and pressure is called its molar volume at that temperature and pressure. At STP the number of moles is:

Number of moles (n) = Volume in L / 22.414 L

Molar mass of Fe₂O₃ = 159.7 g/mol

n = 62.0 / 159.7

= 0.388 mol

From the equation, 4 Fe(s) + 3 O₂ (g) → 2Fe₂O₃ (s)

0.388 × 3 / 2 = 0.582 mol O₂

Volume of O₂  = 0.582 ×  22.414 = 13.04 L

Thus the volume of oxygen is 13.04 L.

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