Jose is sweating after winning his 100-meter race.

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.

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:

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:

Explanation:

From the concept of equipartition energy, the energy for the respective degree of freedom is [tex]\dfrac{1}{2}K_BT[/tex]and for diatomic gas, the degree of freedom = 7

Thus, the heat capacity per molecule can be represented as:

[tex]C_v = \dfrac{7}{2} K_B[/tex]

For a heat capacity holding 5 moles of gas; we have:

= [tex]5\times \dfrac{7}{2}\times R[/tex]

Therefore;

C = [tex]5\times \dfrac{7}{2}\times 8.314[/tex]

C = 145.5

B.

The specific heat capacity = C/mass

where the mass of 5 moles of oxygen gas = 32 × 5 g

= 160 g

Thus; specific heat = 145.5/160

specific heat = 0.91 J/gK or 910 J/kg/K

C)

From the tables of specific heat at the given temperature of 300 K, we have:

0.918 J/gk and the estimated value is 0.92 J/gk

Therefore, the results are very near when compared to one another.

The branch of science in deals with chemicals and bonds is called chemistry. The reaction which requires heat to complete the reaction is called an endothermic reaction.

The correct answer to the question is option C has he empirically measured the specific heat of O2 gas at 300 K and compared it with your answer. Are we correct in assuming all the degrees of freedom are available?

The heat capacity is as follows:-

[tex]C_v =\frac{7}{2}Kb \\\\=5*\frac{7}{2} *R\\\\=5*\frac{7}{2}*8.314\\\\C= 145.5[/tex]

The specific heat capacity = C/mass, where the mass of 5 moles of oxygen gas = 32 × 5 g

= 160 g

Thus; specific heat = 145.5/160

specific heat = 0.91 J/gK or 910 J/kg/K.

Hence, the correct answer to the question is option C.

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Answer:

peroid num= 3

group num=13  (boron Group)

Explanation:

Answer:

period

3

group

13

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:

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.

Explanation:

Iron, like other metals, conducts heat and electricity, has a luster, and forms positive ions in its chemical reactions. Pure iron is fairly soft and can easily be shaped and formed when hot. Its color is silvery white. Iron is easily magnetized.

Answer:

physical properties:

1. Pure iron greyish white in colour  

2. Iron is a heavy metal. Its density is 7.86 g cm-3.

3. Its melting point is 1539`C.

4. It is highly malleable and ductile.

5. It is ferromagnetic, that is, it becomes strongly magnetised when placed in a magnetic field.

6. It has high tensile strength.

chemical properties:

1. Iron is the 4th most abundant element in the Earth’s crust, and it is an integral chemical element found in the human body.

2. It is placed in the first transition series of the periodic table, and is known to be an important transition metal.

3. It mainly exists in the +2 and +3 oxidation states.

4. Iron (II) compounds are known as ferrous, while iron (III) compounds are known as ferric.

5. Iron (II) compounds are light green in color, while iron (III) compounds are orange/brown in color.

6. Iron is the only naturally occurring substance that has magnetic properties. Magnetism is, in fact, one of its most remarkable properties.

hope it helps :)))

Answer:

1. A

2. C

3. B

4. G

5. H

6. D

7. F

8. E

Explanation:

Answer:

Explanation:

For the Magnesium Ion, ([tex]Mg^{+2}[/tex])

Electrons:  10

Protons: 12

Neutrons: 12

evaporation because the water is coming out of the water into the air

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.

Explanation:

Hey there!

The differences between physical chamge and chemical change are;

Hope it helps...

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:

A water molecule

Explanation:

The removal of a phosphate molecule from ATP to form ADP is a hydrolysis reaction. Hydrolysis reactions require water and release energy.

The converse reaction - when a phosphate is added to a molecule of ADP to form ATP - releases water and requires energy.

Answer: 15 METERS IN A SECOND

Explanation: 54km = 54000m    54000m / 60 = 900    900/60 = 15

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: 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.

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 Avogadro's Number will reduce in value

Explanation:

From the question we are told that

The current pass through the short circuit is [tex]0.1 *I[/tex]

Here I is the total current

Generally Avogadro's Number is mathematically represented as

[tex]N_A = \frac{Q}{ 2 * n * e}[/tex]

Here Q is the charge which is mathematically represented as

[tex]Q = It[/tex]

        n  is number of moles

        e is the charge on an electron

 So

       [tex]N_A =  \frac{I * t }{ 2 *  n * e}[/tex]

Now when the current decreases from 100% to  90% due to the short circuit . this will also reduce  the no of moles of metal  dissolved hence from the equation we see that the Avogadro's Number will reduce

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:

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

Explanation:

Answer:

4 5 6

Explanation:

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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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:

ion now i jus want points sorry

Explanation:

Explanation:

The gravitational force between two objects is given by :

[tex]F=G\dfrac{m_1m_2}{d^2}[/tex]

Where

G is universal gravitational constant

d is the distance between two masses

The gravitational force is inversely proportional to the distance between objects. It means when the distance between objects increases, gravitational force decreases and vice versa. To decrease the gravitational force between two objects, distance must increase.

Answer:

You have to increase the distance between two objects.

Explanation:

I took the K12 quiz and this was the correct option.

Hope I helped

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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