A solution containing a mixture of 0.0333 M0.0333 M potassium chromate ( K2CrO4K2CrO4 ) and 0.0532 M0.0532 M sodium oxalate ( Na2C2O4Na2C2O4 ) was titrated with a solution of barium chloride ( BaCl2BaCl2 ) for the purpose of separating CrO2−4CrO42− and C2O2−4C2O42− by precipitation with the Ba2+Ba2+ cation. The solubility product constants ( KspKsp ) for BaCrO4BaCrO4 and BaC2O4BaC2O4 are 2.10×10−102.10×10−10 and 1.30×10−61.30×10−6 , respectively.
A) Which barium salt will precipitate first? O BaC204 O BaCrO4
B) What concentration of Ba2+ must be present for BaCrO4 to begin precipitating? Number [Ba2+]=
C) What concentration of Ba is required to reduce oxalate to 10% of its original concentration? Number 2+
D) What is the ratio of oxalate to chromate (IC204CrO4) when the Ba2 concentration is 0.0050 M? Number C,O Cro,

Answer:

A metamorphic rock is rock that comes from mountains and its little rocks squished together

Explanation:

Answer:

Explanation:

In S₈ , there are 8 single bonds which breaks up first . Energy absorbed

= 8 x 240 = 1920 kJ

In S₈ four double bonds of S₂ are formed . Let bond energy be x . In this process energy will be released . energy released in four S₂ molecules formed = 4 x

Given

1920 + 4x = 239

4x = 239 - 1920

x = - 420.25 kJ .

So bond energy of S₂ = 420.25 kJ .

Answer: The correct option is, (a) 9.0 g

Explanation : Given,

Mass of [tex]N_2H_4[/tex] = 8.0 g

Mass of [tex]N_2O_4[/tex] = 92 g

Molar mass of [tex]N_2H_4[/tex] = 32 g/mol

Molar mass of [tex]N_2O_4[/tex] = 92 g/mol

First we have to calculate the moles of [tex]N_2H_4[/tex] and [tex]N_2O_4[/tex].

[tex]\text{Moles of }N_2H_4=\frac{\text{Given mass }N_2H_4}{\text{Molar mass }N_2H_4}[/tex]

[tex]\text{Moles of }N_2H_4=\frac{8.0g}{32g/mol}=0.25mol[/tex]

and,

[tex]\text{Moles of }N_2O_4=\frac{\text{Given mass }N_2O_4}{\text{Molar mass }N_2O_4}[/tex]

[tex]\text{Moles of }N_2O_4=\frac{92g}{92g/mol}=1mol[/tex]

Now we have to calculate the limiting and excess reagent.

The balanced chemical equation is:

[tex]2N_2H_4(g)+N_2O_4(g)\rightarrow 3N_2(g)+4H_2O(g)[/tex]

From the balanced reaction we conclude that

As, 2 mole of [tex]N_2H_4[/tex] react with 1 mole of [tex]N_2O_4[/tex]

So, 0.25 moles of [tex]N_2H_4[/tex] react with [tex]\frac{0.25}{2}=0.125[/tex] moles of [tex]N_2O_4[/tex]

From this we conclude that, [tex]N_2O_4[/tex] is an excess reagent because the given moles are greater than the required moles and [tex]N_2H_4[/tex] is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of [tex]H_2O[/tex]

From the reaction, we conclude that

As, 2 mole of [tex]N_2H_4[/tex] react to give 4 mole of [tex]H_2O[/tex]

So, 0.25 mole of [tex]N_2H_4[/tex] react to give [tex]\frac{4}{2}\times 0.25=0.5[/tex] mole of [tex]H_2O[/tex]

Now we have to calculate the mass of [tex]H_2O[/tex]

[tex]\text{ Mass of }H_2O=\text{ Moles of }H_2O\times \text{ Molar mass of }H_2O[/tex]

Molar mass of [tex]H_2O[/tex] = 18 g/mole

[tex]\text{ Mass of }H_2O=(0.5moles)\times (18g/mole)=9.0g[/tex]

Therefore, the mass of [tex]H_2O[/tex] produced is, 9.0 grams.

Explanation:

Hey there!

The differences between physical chamge and chemical change are;

Hope it helps...

Answer:

A= 2, B= 1

Explanation:

In the given electronic configuration of Lithium, the values of A and B are 2 and 1, respectively.

The electronic configuration of an atom describes how its electrons are distributed among the various energy levels and orbitals. It is typically represented using a series of numbers and symbols that indicate the number of electrons in each orbital.

To complete the electron configuration for lithium (Li), we'll refer to the periodic table:

The atomic number of lithium is 3, which means it has 3 electrons. The electron configuration for lithium can be determined as follows:

[tex]1s^2 2s^1.[/tex]

In this case,

So, for lithium (Li), the completed electron configuration is:

[tex]1s^2 2s^1.[/tex]

Therefore, the values of A and B in the given electronic configuration of Lithium are A = 2, B = 1, respectively.

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Answer:

Part A) [tex]m_{Na_2CO_3}^{leftover}=3.74g[/tex]

Part B) Nothing as it is the liming reactant.

Part C) [tex]m_{Ag_2CO_3}=4.42gAg_2CO_3[/tex]

Part D) [tex]m_{NaNO_3} =2.72gNaNO_3[/tex]

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

[tex]Na_2CO_3(aq)+2AgNO_3(aq)\rightarrow Ag_2CO_3(s)+2NaNO_3(aq)[/tex]

Thus, in order to proceed, we first need to identify the limiting reactant is it yielding the least moles of silver carbonate for instance, thus, for the given mass of sodium carbonate (molar mass 106 g/mol) and silver nitrate (molar mass 170 g/mol) we obtain for silver carbonate:

[tex]n_{Ag_2CO_3}^{by\ Na_2CO_3}=3.80gNa_2CO_3*\frac{1molNa_2CO_3}{106gNa_2CO_3}*\frac{1molAg_2CO_3}{1molNa_2CO_3} =0.0359molAg_2CO_3\\\\n_{Ag_2CO_3}^{by\ AgNO_3}=5.43gAgNO_3*\frac{1molAgNO_3}{170gAgNO_3}*\frac{1molAg_2CO_3}{2molAgNO_3} =0.0160molAg_2CO_3[/tex]

In such a way, we can see that the silver nitrate yields less amount of silver carbonate, that is why it is the limiting reactant. Thus, we answer:

Part A) Since sodium carbonate is the excess reactant, we need to compute the consumed grams by the limiting silver nitrate as shown below:

[tex]m_{Na_2CO_3}^{consumed}=5.43gAgNO_3*\frac{1molAgNO_3}{170gAgNO_3}*\frac{1molNa_2CO_3}{2molAgNO_3} *\frac{106gNa_2CO_3}{1molNa_2CO_3} =1.69gNa_2CO_3[/tex]

Therefore, the leftover of sodium carbonate is:

[tex]m_{Na_2CO_3}^{leftover}=5.43g-1.69g=3.74g[/tex]

Part B) Since silver nitrate is the limiting reactant no leftover are present after the reaction as it was all consumed.

Part C) As the 5.43 g of silver nitrate yield 0.0160 moles of silver carbonate, the corresponding mass is computed as shown below:

[tex]m_{Ag_2CO_3}=0.0160molAg_2CO_3*\frac{276gAg_2CO_3}{1molAg_2CO_3}=4.42gAg_2CO_3[/tex]

Part D) Finally, via stoichiometry, we compute the grams of sodium nitrate that are yielded:

[tex]m_{NaNO_3}=5.43gAgNO_3*\frac{1molAgNO_3}{170gAgNO_3}*\frac{2molNaNO_3}{2molAgNO_3} *\frac{85gNaNO_3}{1molNaNO_3} =2.72gNaNO_3[/tex]

Best regards.

Answer:

The answer is Individuals can easily detect changes in the environment when they are absorbed in a task.

Explanation:

The statements is not correct concerning the relationship between attention and perception is that individuals can easily detect changes in the environment when they are absorbed in a task.

Psychology is defined as the scientific discipline that studies mental state and processes and behavior in human and other animals.

It can also be defined as the scientific study of mind and behavior.

Environment is defined as the sum total of all the living and non living elements and there effect that influences human life.  

Thus, the statements is not correct concerning the relationship between attention and perception is that individuals can easily detect changes in the environment when they are absorbed in a task.

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Answer:

the answer is c. I think

Explanation:

Answer:

radiant energy, solar energy

During nuclear fusion, radiant energy and solar energy from the core of the Sun is released. Hope it helps!

Answer:

Cations are positively charged atoms and hence we need to make the atom positively charged in order to get a cation

We know that an atom is neutral as a whole, so we have equal number of electrons and protons

since we cannot mess with the number of protons in an atom, we have to do it by altering the number of electrons

If we reduce the amount of electrons in an atom, the net charge will be positive and hence a cation will be formed

Answer:

Mass of methane burnet 10.025 g.

Explanation:

Given data:

Mass of CO₂ produced = 27.5 g

Mass of methane burnet = ?

Solution:

Balanced  chemical equation.

CH₄ + 2O₂    →   CO₂ + 2H₂O

First of all we will calculate the number of moles of CO₂ produced.

Number of moles = mass/ molar mass

Number of moles = 27.5 g/ 44 g/mol

Number of moles = 0.625 mol

Now we will compare the moles of CO₂ with CH₄.

                      CO₂            :              CH₄

                        1               :                 1

                     0.625         :               0.625

0.625 moles of CH₄ are burnet.

Mass of methane burned:

Mass = number of moles × molar mass

Mass = 0.625 mol × 16.04 g/mol

Mass = 10.025 g

Answer:

40.88 kPa.

Explanation:

Given that,

Volume, V₁= 4.2 L

Pressure, P₁ = 110 kPa

We need to find the pressure of the gas when the volume is changed to 11.3L at constant temperature.

According to Boyle's law, at constant temperature, volume is inversely proportional to the pressure. Mathematically,

[tex]P_1V_1=P_2V_2\\\\P_2=\dfrac{P_1V_1}{V_2}\\\\P_2=\dfrac{4.2\ L\times 110\ kPa}{11.3\ L}\\\\P_2=40.88\ kPa[/tex]

So, the new pressure is 40.88 kPa.

Answer:

C. Rutherford's model shows the positive charge of an atom as a very small area.

Explanation:

Rutherford's model shows the positive charge of an atom as a very small area.

The Thompson model of the atom depicted the atom as a sphere of positively charges into which negative charges were embedded. This is called the plum - pudding model of the atom.

The Rutherford's model of the atom depicted the atom as having a core containing positive charges. This core occupies a very small area and is surrounded by electrons. This is called the planetary model.

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Answer: The lone pair of electron on nitrogen is accommodated in a 2p orbital hence it interacts with the pi system in aniline.

Explanation:

Aniline is less basic than amines. This is because, the nitrogen atom in aniline is not purely sp3 hybridized. Its actual hybrization state is closer to sp2 because the lone pair on nitrogen is accommodated in a 2p orbital. The nitrogen atim in aniline is planar and its

lonely pair interacts with the pi electron system of aniline. This makes the lone pair unavailable for protonation hence aniline is less basic than amines.

Answer:

Explanation:

mass of N2                Mass of3 H2

2x (14) g/mole                     3x(2x1) g/mole

        X        g                           5.8 g

  mass of nitrogen = 27 g

Answer:Please see answers in the explanation column

Explanation:

In a  mixture of salt, sand, iron fillings, and large rocks in a big bucket.

The process of separation is as follows:

Ist step ---

Use of magnet : Because Irons are attracted to magnet, Introducing a magnet to the mixture will cause the iron fillings to cling to the magnet leaving the other constituents behind

2nd Step

we eliminate the large rocks by carefully Sorting or picking them out since they are large and visible or we use a MESH  or Sieve  and carry out the separation by pouring  the rock, salt and  sand mixture on top of the mesh with continuous shaking so as to filter the smaller particles,The smaller particles will pass through the mesh while the bigger rocks remains on top.

3rd Step

We are left with the salt and sand. we will then introduce water to mix the salt and sand. salt dissolves completely in water while the sand settles as the bottom of the container. We can then separate the  sand by  decantation and then filtration to remove any left over sand.

4th step

Evaporation is then carried out on the salt solution to separate the salt from water.

Answer:

D

Explanation:

Have a nice day

Among the following observations which is usually not evidence of a chemical change is change of a shape.

Chemical changes will occur when the composition of the substance is changes internally or converted into any new product.

So, change of shape is not a chemical change.

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Answer:

All compunds are molecules, but not all molecules are compounds.

Explanation:

Not all molecules are made of compounds because some molecules only have one element, of only one type of atom.

Answer:

Option B: Uranium is larger than Titanium and it has a higher ionization energy

Explanation:

From left to right across the periodic table, electronegativity increases.

So, going from left to right across the periodic table, Titanium comes before uranium. Thus;

Uranium will have a higher electronegativity.

So option A is false

From left to right across the periodic table, ionization energy increases.

Thus;

Uranium will have a higher ionization energy than Titanium.

Thus; option B is correct.

We know, change in temperature is given by :

[tex]T_2-T_1=\dfrac{q}{mC_p(Gold)}[/tex]

Putting all given values, we get :

[tex]T_2-T_1=\dfrac{70\ cal}{20\ g\times 0.0310\ cal/g^o\ C}\\\\T_2-T_1=112.90^oC\\\\T_2-35^oC=112.90^oC\\\\T_2=(112.90+35)^oC\\\\T_2=147.9^oC[/tex]

Hence, this is the required solution.

Answer:

1. A

2. C

3. B

4. G

5. H

6. D

7. F

8. E

Explanation:

Answer:

2.29 × 10²³ formula units of MgCl₂

Explanation:

Given data:

Mass of MgCl₂ = 36.2 g

Number of formula units = ?

Solution:

The given problem will be solved by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water  = 6.022 × 10²³ formula units of water.

In 36.2 g of MgCl₂:

Number of moles = mass / molar mass

Number of moles = 36.2 g / 95.211 g/mol

Number of moles = 0.38 mol

1 mole = 6.022 × 10²³ formula units

0.38 mol / 1mol × 6.022 × 10²³ formula units

2.29 × 10²³ formula units of MgCl₂

Answer:

Part A. p, n = 31, 38.

Part B. p, n = 31, 40.

Part C. [tex]^{69}_{31}Ga,\ ^{71}_{31}Ga[/tex]

Explanation:

Hello,

Part A.

In this case, since the atomic number for gallium is 31, we can say that the first isotope has also 31 protons and the neutrons are computed by using its molar mass as a whole number (69):

[tex]neutrons=mass-protons=69-31=38[/tex]

Thus, result is p, n = 31, 38.

Part B.

In this case, since the atomic number for gallium is 31, we can say that the second isotopes has also 31 protons and the neutrons are computed by using its molar mass as a whole number (71):

[tex]neutrons=mass-protons=71-31=40[/tex]

Thus, result is p, n = 31, 40.

Part C.

Finally, the isotopes as shown as:

[tex]^{69}_{31}Ga,\ ^{71}_{31}Ga[/tex]

Best regards.

Answer:

4 5 6

Explanation:

Answer:

Explanation:

This question is both theoretical and practical. While the theoretical aspect will be detailed fully here, the practical aspect will be provided as a form of guidance.

Water generally boils at 100°C when altitude (in feet) is 0. One of the colligative properties that occurs when salt is added to water is that there is a boiling point elevation(meaning an increase in boiling point). For instance, if 20g of salt is added to about 5.3 quarts of water, the boiling point of water will increase from 100°C to 100.04°C.

However, when the altitude/elevation of a place is about 7000 ft (like in Flagstaff, Arizona), water will boil at 95.3°C. In order to get 2 quarts of water to boil at 100°C in Flagstaff;

20g causes an increase in boiling point by 0.04°C (100°C to 100.04°C) in 5.3 quarts of water

What gram will increase the boiling point by same 0.04°C in 2 quarts

20g ⇒ 5.3

X ⇒ 2

5.3 X ⇒ 40g

X = 40 ÷ 5.3

X = 7.55g

Hence, 7.55g will cause an increase in boiling point by 0.04°C (from 100°C to 100.04°C) in 2 quarts of water

What mass of salt will increase the boiling point by 4.7°C (95.3°C to 100°C)

7.55g ⇒ 0.04

X ⇒ 4.7

X × 0.04 ⇒ 7.55 × 4.7

0.04X ⇒ 35.5

X = 887.5g

Hence, in order for the spaghetti water to boil at 100°C, 887.5g of salt needs to be added.

For the practical part of the question, some Kitchen scales have an accuracy of .25kg (250g) and some have an accuracy of .2 kg (200g) and some have an accuracy of .5kg (500g). The one your kitchen has will determine the amount of salt that you can measure. For example, if your kitchen scale/balance has an accuracy of 250g/0.25kg, then you can only measure 750g of the 887.5g (as the rest is 137.5g, which is not up to 250g of the scale's accuracy) of the required salt measurement. However, if you have a digital balance that can measure up to 2kg/2000g in one decimal place, that's the perfect balance to measure this salt.

Answer: the ton of the household ammonia is 4000

Explanation:

Given that;

the initial ammonia in 200mL sample = 1ml

also decided to reduce to 10 ml of the first time diluted household ammonia and the odor was just detectable

10ml ammonia content = 1/200 * 10 = 1/20ml

we know that total volume is 200 ml

therefore the TON of household ammonia will be = total volume / volume of ammonia

TON = total volume / volume of ammonia

we substitute

TON = 200 / (1/20)

TON = 200 / 0.05

TON = 4000

therefore the ton of the household ammonia is 4000

Answer:

Nucleolus

Explanation:

It holds the DNA

Answer:

Nucleolus

Explanation:

I did the test. You’re welcome. ✌️

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\ [/tex]

From the question

mass of object = 10.02 g

density = 4.08 g/mL

The volume of the object is

[tex]volume = \frac{10.02}{4.08} \\ = 2.4558823...[/tex]

We have the final answer as

Hope this helps you

Answer:

The bromine molecule, Br2 will likely react with Sr in a similar way to chlorine molecule, Cl2.

Explanation:

Chlorine belongs to group 7 of the periodic table. Elements in this group are known as halogens. Its molecule has the formula Cl2. The next element in the group after chlorine is bromine. Its molecule has a formula Br2. It has similar properties as chlorine, therefore, it would react with Strontium in a similar way to chlorine.

Elements belonging to the same group of the periodic the table have similar chemical properties as they contain the same number of valence electrons. Chlorine and Bromine both belong to group 7 of the periodic table and each have seven valence electrons. They both react with metals to form salts even though reaction with chlorine is more vigorous as it is more reactive than bromine. They both form negatively-charged ions with a charge of -1.

Reaction of Strontium with the halogens:

With chlorine: Sr + Cl2 ---> SrCl2

With bromine: Sr + Br2 ---> SrBr2

The salts formed are both crystalline salts with high melting and boiling points.

A molecule X₂ that will likely react with Sr in a way similar to how Cl₂ reacts with Sr is I₂

Strontium, Sr is a group 2 element.

Chlorine, Cl is a group 17 element. All members of this group have 7 valence electrons and as such, they have similar chemical properties. Other members of this group include fluorine (F), bromine (Br), iodine (I).

Chlorine molecule (Cl₂) reacts with strontium (Sr) as follow:

Iodine molecule (I₂) will also reacts in the same way since they are in the same group.

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