This right guys? plz help

Answer:

[tex]T_i~=163.1[/tex] ºC

Explanation:

We have to start with the variables of the problem:

Mass of water = 60 g

Mass of gold = 13.5 g

Initial temperature of water= 19 ºC

Final temperature of water= 20 ºC

Initial temperature of gold= Unknow

Final temperature of gold= 20 ºC

Specific heat of gold = 0.13J/gºC

Specific heat of water = 4.186 J/g°C

Now if we remember the heat equation:

[tex]Q_H_2_O=m_H_2_O*Cp_H_2_O*deltaT[/tex]

[tex]Q_A_u=m_A_u*Cp_A_u*deltaT[/tex]

We can relate these equations if we take into account that all heat of gold is transfer to the water, so:

[tex]m_H_2_O*Cp_H_2_O*deltaT=~-~m_A_u*Cp_A_u*deltaT[/tex]

Now we can put the values into the equation:

[tex]60~g*4.186~J/g{\circ}C*(20-19)~{\circ}C=-(13.5~g*0.13~J/g{\circ}C*(20-T_i)~{\circ}C)[/tex]

Now we can solve for the initial temperature of gold, so:

[tex]T_i~=(\frac{60~g*4.186~J/g{\circ}C*(20-19)~{\circ}C}{13.5~g*0.13~J/g{\circ}C})+20[/tex]

[tex]T_i~=163.1[/tex] ºC

I hope it helps!

Taking into account the definition of calorimetry,  the initial temperature of the gold metal sample is 163.36 °C.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

For gold: Qgold= 0.13 [tex]\frac{J}{gC}[/tex]× 13.5 g× (20 C - Initial temperature of gold)

For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× 60 g× (20 C - 19 C)

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qgold = + Qwater

- 0.13 [tex]\frac{J}{gC}[/tex]× 13.5 g× (20 C - Initial temperature of gold)= 4.186 [tex]\frac{J}{gC}[/tex]× 60 g× (20 C - 19 C)

Solving:

- 1.755 [tex]\frac{J}{C}[/tex]× (20 C - Initial temperature of gold)= 251.16 J

- 1.755 [tex]\frac{J}{C}[/tex]× 20 C - (- 1.755 [tex]\frac{J}{C}[/tex])× Initial temperature of gold= 251.16 J

- 35.1 J +1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold= 251.16 J

1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold= 251.16 J + 35.1 J

1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold=286.7 J

Initial temperature of gold=286.7 J÷ 1.755 [tex]\frac{J}{C}[/tex]

Initial temperature of gold= 163.36 °C

Finally, the initial temperature of the gold metal sample is 163.36 °C.

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Answer:

2.56g of H₂S

Explanation:

The reaction of H₂S with Pb(CH₃COO)₂ is:

H₂S + Pb(CH₃COO)₂ → 2 CH₃COOH + PbS

Where 1 mole of H₂S produce 1 mole of PbS

18.00g of PbS (Molar mass: 239.3g/mol):

18.00g of PbS ₓ (1mol / 239.3g) = 0.0752 moles of PbS

As 1 mole of PbS is produced from 1 mole of H₂S, moles needed of H₂S are 0.0752

As molar mass of H₂S is 34.1g/mol, mass in 0.0752moles is:

0.0752 mol H₂S ₓ (34.1g / mol) = 2.56g of H₂S

Answer:

Pressure initially is 760 torr.

Temperature is at 273.15

Temperature is increased to 298.15

Pressure increases by a factor of 298.15 / 273.15 = 1.0915248032

760 * 1.0915248032  = 829.558850432  torr

Explanation:

Answer:

in plant and animal cells

Explanation:

It happens in both and occurs in the mitochondria.

Answer:

12 moles of CO

Explanation:

According to Avogadro, one mole of a substance, contains the same number of elementary entities as 12g of carbon-12. Now the number of elementary entities (atoms, molecules, ions, particles etc) in any substance is given by the Avogadro's constant.

Now since 1 mole of a substance contains Avogadro's number of atoms, it means that the substance with the highest number of moles will have the highest number of atoms.

With this in mind we can see that 12 moles of CO is expected to contain 72.24 ×10^23 atoms of CO. Hence the answer.

Answer:

c. 11 moles of N2O.

Explanation:

Hello,

In this case, for each substance, we use the Avogadro's number to compute the number of atoms in the given sample:

a.

[tex]atoms \ C=9molCO_2*\frac{1molC}{1molCO_2} *\frac{6.022x10^{23}atoms\ C}{1molC} =5.4x10^{24}atoms\ C[/tex]

[tex]atoms \ O=9molCO_2*\frac{2molO}{1molCO_2} *\frac{6.022x10^{23}atoms\ O}{1molO} =1.1x10^{25}atoms\ O[/tex]

[tex]Total\ atoms=1.1x10^{25}+5.4x10^{24}=1.64x10^{25}atoms[/tex]

b.

[tex]atoms \ Xe=10molXe *\frac{6.022x10^{23}atoms\ Xe}{1molXe} =6.022x10^{24}atoms[/tex]

c.

[tex]atoms \ N=11molN_2O*\frac{2molN}{1molN_2O} *\frac{6.022x10^{23}atoms\ N}{1molN} =1.3x10^{25}atoms\ N[/tex]

[tex]atoms \ O=11molN_2O*\frac{1molO}{1molN_2O} *\frac{6.022x10^{23}atoms\ O}{1molO} =6.6x10^{24}atoms\ O[/tex]

[tex]Total\ atoms=1.3x10^{25}+6.6x10^{24}=2.0x10^{25}atoms[/tex]

d.

[tex]atoms \ C=12molCO_2*\frac{1molC}{1molCO_2} *\frac{6.022x10^{23}atoms\ C}{1molC} =7.2x10^{24}atoms\ C[/tex]

[tex]atoms \ O=12molCO_2*\frac{1molO}{1molCO_2} *\frac{6.022x10^{23}atoms\ O}{1molO} =7.2x10^{24}atoms\ O[/tex]

[tex]Total\ atoms=7.2x10^{24}+7.2x10^{24}=1.44x10^{25}atoms[/tex]

Thus, we notice 11 moles of N2O have the greatest number of atoms.

Best regards.

Answer:

Organic compounds

Explanation:

I just did this question and apparently it’s that. (:

The correct answer is organic compounds.

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Answer:

Scattering of light through a solution when light passes through it is called Tyndall effect.

In a colloidal solution, the particle size is between 1 nm to 100 nm, when light rays fall on colloidal solution, these particles sizes allow scattering of light ray.

But in true solution the size of particles is smaller than 1nm and unable to scatter the light and do not show tyndall effect.

Hence, colloidal solution shows tyndall effect but true solution do not.

Answer:

4p

Explanation:

3s < 3p < 4s < 4p

This arrangement is in order of increasing energy.

This explains that, 4p is the highest energy level you can reach.

Answer:

In order to calculate the work that the spike did, you have to respect the following equation:

WORK = FORCE X DISPLACEMENT X COS (0)

Explanation:

Work is measured in joules, and is the amount of energy a body needs to make a certain force over a certain distance.

In the case of this bird we would be calculating with the equation written up in the previous item the work that said animal would do to grind a seed.

Answer:

They are generally found in mines

Answer:

Redox reactions have a reducing agent and a oxidizing agent

Explanation:the reducing agent is more reactive than the oxidizing agent

Answer:

It breaks down food to create energy

Answer: Magnet

Explanation:Using a magnet is the best separating technique to be deployed in this case. The nails are easily picked out by just holding a magnet over the sandbox.

Answer:

An alkane is a hydrocarbon in which there are only single covalent bonds. The simplest alkane is methane, with the molecular formula CH4.

Explanation:

Alkanes.

Name Heptane

Molecular Formula C7H16

Condensed Structural Formula CH3CH2CH2CH2CH2CH2CH3

Boiling Point (°C) 98.5

Hydrocarbons which are alkanes with 4 or more than 4 carbon atoms have more than one possible structural formula which is a type of chemical formula.

Structural formula helps in identifying location of chemical bonds which are present between atoms in a molecule.It consists of symbols of elements for the atoms which are connected by short lines which actually represent the chemical bonds.

Structural formulae can be deduced from molecular formulae the fragment ions are studied in the mass spectrum.It is concerned with the valency which helps in determination of of how atoms a combine in a definite ratio.

Properties of molecules are much related with their structures. It helps in showing the arrangement of atoms in a three-dimensional space.

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Answer:

1. Exothermic.

2. Yes, released.

3. 38.65KJ of heat is released.

Explanation:

The equation for the reaction is given below:

2NO2 —> N2O4...... ΔH = –55.3KJ

1. The sign of the enthalpy change, ΔH tells whether the reaction is endothermic or exothermic. Since the sign of the enthalpy change, ΔH is negative, the reaction is exothermic.

2. The negative sign indicate that heat is released to the surrounding. Since the reaction is generally an exothermic reaction, 64.3g of NO2 will also release heat to the surroundings.

3. Molar mass of NO2 = 14 + (16x2) = 46g/mol

Mass of NO2 from the balanced equation = 2 x 46 = 92g.

From the balanced equation above:

92g of NO2 reacted to release –55.3KJ of heat.

Therefore, 64.3g of NO2 will react to release = (64.3 x –55.3)/92 = 38.65KJ of heat.

Therefore, 38.65KJ of heat is released.

Answer:

left/center

Explanation:

Metals including, alkali metals, alkaline earth metals, and transition metals are all located on the left/center.

hope I helped!

Answer

let the oxidation of sulphur is x

2(+1)+x+4(-2)=0

+2+x-8=0

+2-8+x=0

-6+x=0

x=6

Explanation:

i hope this will help you:)

Answer:

5.

Explanation:

The pOH is found by subtracting the pH by 14, because the pH and the pOH always add up to 14. So the pOH of a solution with the pH of 9 would be 5.

Hope this helps you out. :)

Answer:

X = U (Uranium)

Explanation:

Pu-->235/92 U + 4/2 He

The element X which is involved in the given nuclear reaction is ²³⁵₉₂U.

Radio active decay is a process in which an unstable nuclei will emit some particles from the nuclei in the form of energy to get stability.

In the given chemical reaction, parent nuclei (²³⁹₉₄Pu) will emit the alpha particle (⁴₂He) which has a atomic number 2 and atomic mass of 4 as a result of which we get a daughter nuclei Uranium which will get the atomic number 92 and atomic mass of 235.

²³⁹₉₄Pu → ⁴₂He + ²³⁵₉₂U

Hence the element X is uranium (²³⁵₉₂U).

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Answer:

20L

Explanation:

The following data were obtained from the question:

Initial volume (V1) = 10L

Initial Temperature (T1) = stp = 273K

Final temperature (T2) = 546K

Final volume (V2) =..?

The new volume of the gas can be obtained by using the Charles' law equation as shown below:

V1/T1 = V2/T2

10/273 = V2/546

Cross multiply to express in linear form

273 x V2 = 10 x 546

Divide both side by 273

V2 = (10 x 546) / 273

V2 = 20L

Therefore, the new volume of the gas is 20L.

Answer:

The water tastes sweet, and it usually appears to be cloudy or not clear.

Explanation:

If nothing dissolves into the water, then it should be clear.

Answer:You can tell if the sugar is still there by boiling off the water and leaving the sugar behind in the container. Sugar is a solid, and therefore cannot evaporate, so when the water reaches boiling point, it will evaporate at a quicker rate than before (water evaporates at any temperature in liquid form; just not enough to be noticeable) and leave the container to become water vapour

Explanation: If you stir a spoonful of sugar into hot water, the sugar will dissolve in the hot water. When sugar or another substance is dissolved in water, it disappears from view and forms a homogeneous mixture with the water, also called a solution.

Answer:

C

Explanation:

energy is measures the capacity to do work.

Answer:

C

Explanation:

APEX

proton is the name for a nuclear particle that has about the same mass as a neutron, but with a positive charge.

Answer:

To get from DNA, written in one chemical language, to protein, written in another, requires two major stages, transcription and translation.

Explanation:

I hope This Helps ^^!!! あなたの歓迎

Answer:

Lots of bad things would happen

Explanation:

People would lose their jobs

People would fall out of contact (no phones)

It would be pretty dark (no streetlights)

You would have to learn everything by book or asking someone

ect.

Answer: My life would change drastically.

Explanation:

This is because electricity is used in my everyday life . If I no longer had electricity then i would have to change my whole life and how I did things . I would have to adapt to my new environment without electricity.

Answer:

C) the components

Explanation:

The term component is referred to as the distinctively recognizable part, piece, of a system that is required to complete a function, in that particular system. Moreover, it carries out a distinguishable and necessary function in the operation of a specific system.  For example, a computer has a number of components that make it whole, and the most essential of them is the Central Processing Unit.

Answer:

c) the components

Explanation:

I took the quiz

Answer:

0.485mol/kg

Explanation:

Molality is defined as the ratio of the number of moles of a solute to the kilogram of a solvent which is usually water.

Mass of NaBr = 10g

Molar mass of NaBr= 23+80=103g/mol

Mole of NaBr = mass / molar mass=10g/103g/mol= 0.097mol

Molality= Mole of a solute/ mass of solvent in kg

Mole of a solute( NaBr)= 0.097mol; mass of solvent( water in kg)= 200g. To convert to kg: 200g/1000g= 0.2kg

Molality = 0.097mol/0.2kg = 0.485mol/kg