A
Which of the following describes a compound? (Hint: Carbon and oxygen both appear on the periodic table.)

Answer:

c≈0.3418 [J/(gr*K)].

Explanation:

1) formula of heat:

Q=cm(T-t), where Q- energy of heat, c - required specifie heat, m - mass, T and t - initial and final temperatures;

2) according to the formula above:

[tex]c=\frac{Q}{m(T-t)};\\ c=\frac{596}{73*(50-26)}=0.34018264840182648401826484018265[\frac{J}{g*K}].[/tex]

P.S. the differrence in °C is equal the difference in °K.

If the change in enthalpy is positive then reaction must be endothermic, it means all absorb energy while reaction proceed.

Given,

H2S(g) + 2 O2(g) → H2SO4 (l)                      ΔH = –235.5 kJ       Equation (1)

H2S(g) + 2 O2(g) → SO3(g) + H2O(l)          ΔH = –207 kJ          Equation (2)

H2O(l) → H2O(g)                                         ΔH = 44 kJ              Equation (3)

From above given reaction,

Reverse the equation (1) reaction

H2SO4 (l) → H2S(g) + 2 O2 (g)          ΔH = 235.5 kJ            Equation (4)

Adding all equations (2), (3), and (4):

To get overall reaction is:

H2SO4 (l) → SO3 (g) + H2O (g)

Overall ΔH value is:

ΔH = 235.5 kJ - 207 kJ + 44 kJ

ΔH = 72.5 kJ

Overall change in enthalpy is +72.5 kJ.

The reaction is thermodynamically favored

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Answer:

The wax vapor starts to burn and creates the stable candle flame that you see. When you blew out the candle you should have seen white smoke rising up into the air from the wick. This is the wax vapor, which becomes visible as it condenses into small liquid droplets in the cooler air.

Explanation:

hope it helps

Answer:

This would be my answer and I hope this helps you.

observe that the flame is not touching the solid candle or the melted wax. It appears to be only touching the wick. I ask them if they think that the candle would burn as long if it were only the wick that was burning. What is the purpose of the wax? When the students place the first flame into the smoke of the second candle, they should see the second candle relight. It is not necessary to touch the wick in order for it to relight. This should lead them to conclude that it is the wax vapor that is burning.

When the students place the beaker containing the ice water above the candle, they should see condensation on the bottom of the beaker. If they hold it too close, they will not see the condensation and will see soot form. Students will usually recognize that the condensation is made of water, but they have difficulty recognizing that it comes from the combustion of the candle.

When the Erlenmeyer flask is placed over the top of the candle in the water, student should observe that the water candle goes out and the water rises. The students test the gas that was collected with phenol red solution (an acid-base indicator). They should observe that the solution changes from red to yellow. I demonstrate that this might indicate the formation of carbon dioxide by blowing through a straw into a solution of phenol red.

Explanation:

Hope this helped you!And thanks for inviting me to be your friend!(:

Answer:

Answer:Even though the two surfaces are sliding past each other, there can still be a frictional force between the surfaces, but this sliding friction we call a kinetic frictional force.

Answer:

Luke 1:15-17

New International Version

15 for he will be great in the sight of the Lord. He is never to take wine or other fermented drink,(A) and he will be filled with the Holy Spirit(B) even before he is born.(C) 16 He will bring back many of the people of Israel to the Lord their God. 17 And he will go on before the Lord,(D) in the spirit and power of Elijah,(E) to turn the hearts of the parents to their children(F) and the disobedient to the wisdom of the righteous—to make ready a people prepared for the Lord.”(G)

The words which will help him make his search for various types of plants on the Internet easier and faster is “different types of plants” and is denoted as option D.

This is defined as the process in which something is sought for carefully through the use of different types of techniques so as to make it easier.

In the case of Mark looking for information on various types of plants, the best words to type will make his search on the Internet easier and faster is “different types of plants” as it contains all the necessary keywords which is used by the search engine to bring out the result.

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Answer:

time it takes the pendulum to make one full swing back and forth swing

Answer:

Answer:

d)the time it takes for the bob to swing back and forth once

Explanation:

Time period of any object is defined as the time after which it can complete its one round of repetitive motion

So here in the back and forth motion of simple pendulum we know that it will move to and fro about its mean position and the total time to make its to and from motion is known as its time period

so here correct answer would be

d) the time it takes for the bob to swing back and forth once

for simple pendulum the formula of time period is given as

T = 2\pi \sqrt{\frac{L}{g}}T=2πgL

here we know

L = length of pendulum

g = acceleration due to gravity

The Density of copper sample is 8.9 g/cm³ to the nearest tenth.

Density is the ratio of the mass of a substance and the volume occupied by that substance.

Density measures how tightly-packed the particles in a substance are.

The more tightly-packed the particles are, the denser the substance will be.

The  formula for calculating the density of a substance is given below as:

Dense substances have smaller volumes but greater masses.

The mass of the copper sample = 39.2 g

The volume of the copper sample = 4.4 cm³

Hence, the density of the copper sample will be:

Density of copper sample = 39.2 g/4.4 cm³

Density of copper sample =8.9 g/cm³

In conclusion, density is a ratio of mass and volume.

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The student’s test average points for the four test is 89.3 points

The Mean is defined as the arithmetic average. Mathematically, it can be expressed as:

Mean = (Summation of scores) / number of scores

The following data were obtained from the question:

Average = (Summation of scores) / number of test

Average = 357.3 / 4

Average = 89.3 points

Thus, the student’s test average points for the four test is 89.3 points

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Answer:

the answer is maybe 0.000777

Answer:

false

Explanation:

Mateo and the officers should secure the crime scene.

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The mass of calcium hydroxide produced is 42.2g.

A white powder without any smell is calcium hydroxide. It is applied in commercial contexts such sewage treatment, paper manufacturing, building, and food processing. It can be used in dentistry and medicine. In root canal fillings, for instance, calcium hydroxide is frequently used. Slaked lime, often known as calcium hydroxide, is an inorganic substance having the chemical formula Ca(OH)2.

It is created when quicklime is combined or slaked with water and is a colorless crystal or white powder. It goes by a variety of names, including pickled lime, hydrated lime, caustic lime, builders' lime, and slaked lime. Calcium hydroxide, often known as E number E526, is a chemical that is employed in a variety of processes, including the production of food. A saturated solution of calcium hydroxide is known as limewater, often known as milk of lime.

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Answer:

option a

volume

Explanation:

as they differ in mass/weight ,density is not possible

For an endothermic reaction, ΔH is positive (>0).

For an exothermic reaction, ΔH is negative (<0).

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The  third quantum number of a 2p[tex]^{3}[/tex] electron in phosphorus is ml= -1.

Quantum numbers are the set of numbers describe the position of electron and energy of electron in an atom.there are four types of quantum numbers.

Electronic configuration of phosphorus is 1s[tex]^{2}[/tex] 2s[tex]^{2}[/tex] 2p[tex]^{6}[/tex] 3s[tex]^{2}[/tex] 3p[tex]^{6}[/tex]

Quantum numbers for 2p[tex]^{3}[/tex]

1) Principal quantum number (n) = 2

2) Azimuthal quantum number (l) = (n-1) = 1

3) magnetic quantum number (ml) = -l to +l = -1 , 0 , +1

form the given option , ml = -1  for n= 2 , l = 1

Thus,The third quantum number of a 2p[tex]^{3}[/tex] electron in phosphorus is m= -1

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Answer: A. m/= -1

Explanation:

The number of excess electrons contained within the drop of Millikan oil drop experiment is determined as 7 excess electrons.

The excess electrons contained within the drop of Millikan oil drop experiment is calculated as follows;

-1.60 x 10⁻¹⁹ C = 1 electron

-1.12×10⁻¹⁸ C = ? electrons

= ( -1.12×10⁻¹⁸ C) / (-1.60 x 10⁻¹⁹ C )

= 7 excess electrons

Thus, the number of excess electrons contained within the drop of Millikan oil drop experiment is determined as 7 excess electrons.

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The mass, in grams, of 932 atoms of cesium, Cs is 2.06×10⁻¹⁹ grams

6.02×10²³ atoms = 1 mole of cesium

But

1 mole cesium = 132.91 g

Thus, we can say that:

6.02×10²³ atoms = 132.91 g of cesium

The mass of cesium that contains 932 atoms can be obtained as illustrated below:

6.02×10²³ atoms = 132.91 g of cesium

Therefore,

932 atoms = (932 atoms × 132.91 g) / 6.02×10²³ atoms

932 atoms = 2.06×10⁻¹⁹ g of cesium

Thus, the mass of cesium that contains 932 atoms is 2.06×10⁻¹⁹ grams

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The difference in electronegativity of the two elements is less than 1.7 represents the covalent bond.

If the electronegative difference is greater than 1.7, the bond's nature is ionic; if it is less than 1.7, the bond's nature is covalent.

The sharing of electrons between atoms is known as covalent bonding. This kind of bonding happens when two atoms of the same or closely related elements in the periodic table come together.

Covalent bonding is seen in  between nonmetals and metals, this bonding typically happens between nonmetals. Covalent bonds are most likely to form when two atoms have comparable electronegativities, or the same affinity for electrons.

Therefore, The difference in electronegativity of the two elements is less than 1.7 represents the covalent bond.

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The specific heat capacity of the given metal is 0.1234 J/g°C.

The specific heat capacity of a metal is the electricity required to elevate one kilogram (kg) of the cloth by one diploma Celsius (°C).

The specific heat capacity of a substance is the heating ability of a pattern of the substance divided by means of the mass of the pattern, also every so often called massic heat ability. precise warmth capability is a measure of the amount of heat power required to change the temperature of 1 kg of a material by 1 k.

q = m x C x DT

q = m x C x ( T f - T i )

q = amount of heat energy gained or lost by a substance

m = mass of the sample

C = heat capacity ( J oC⁻¹g⁻¹ or J K⁻¹ g⁻¹ )

T f = final temperature

T i = initial temperature

-q metal = q water

-(mCΔT) = mCΔT

-( mC (T f-T i ) =  mC( T f-T i )

- (240 g x C x (27°C-150°C) =  150g(4.18J/g°C ) × ( 27°C-21°C )

- ( 240g × C × -127 °C = 150 × 4.18 × 6°C

C =  150 × 4.18 × 6°C / 240g × -127 °

C = 3762 / 30480

C = 0.1234 J/g°C

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The volume of beaker is 326.46 mL.

The volume of a substance is the amount of space a given mass of the substance occupies.

Volume is related to mass and density of a substance by the following formula:

The volume of the beaker is calculated as follows:

Volume of beaker = volume of water

The mass of the empty beaker = 44.19 g.

Mass of the beaker + water when filled completely = 370.65 g

mass of water = 370.65  - 44.19 = 326.46 g

density of water = 1 g/mL

Volume of water = mass/density

Volume of water = 326.46 g/1 g/ml

Volume of water = 326.46 mL

Volume of beaker =  326.46 mL

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The quantity  in moles of sodium atoms is 0.631 moles of sodium if you have 3.80 × 10²³ moles  of sodium.

Moles is defined as a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules and some other specified particles.

It is a very important unit of measurement which chemist use. It can also be defined as the amount of substance that contain exactly 6.022 x 10²³ elementary entities in a given substances.

1 moles = 6.022 x 10²³ atoms

3.80 × 10²³ atoms of sodium will have

3.80 × 10²³  x 1 mole of Na /  6.022 x 10²³ atoms

= 0.631  moles of Na

Thus, quantity  in moles of sodium atoms is 0.631 moles of sodium if you have 3.80 × 10²³ moles  of sodium.

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The type of graph that will be to display the data collected by the store keeper is bar graph.

A bar graph can be defined as a chart or a graphical representation of data, quantities or numbers using bars or strips.

Also, a bar graph is a graph that shows complete data with rectangular bars and the heights of bars are proportional to the values that they represent.

Three bar graphs can be used to display the data collected by the store keeper.

Thus, the type of graph that will be to display the data collected by the store keeper is bar graph.

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Density of neutron is 3.9868×10¹⁷kg/m³

Here given data is radius of a neutron=1.0×10⁻¹³ we have to calculate density of neutron=?

Density=mass/volume

For calculations of density of neutron volume is not given here so volume of sphere is 4/3πr³

So ,neutron stars are composed of solid nuclear matter, primarily neutrons

Vₙ=4/3πr³

= 4/3π(1.0×10⁻¹³ × 10⁻²)³

= 4/3π((1.0×10⁻¹⁵)³

= 4.1888×10⁻⁴⁵m³ this is the volume of neutron

Neutron stars are composed of solid nuclear matter, primarily neutrons.

Assuming that a neutron star has the same density as a neutron then,

Density=mass/volume

mass of neutron=1.67×10⁻²⁷

Density=1.67×10⁻²⁷kg/4.1888×10⁻⁴⁵m³

= 3.9868×10¹⁷kg/m³ is the density of neutron

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The vapor pressure is obtained as 3.7 atm.

The Clausius-Clapeyron equation is the equation that we could use to obtain the vapor pressure of a solution at any temperature. Of course we would always have two different temperatures to work with.

Hence;

ln(P1/P2) = ΔHvap/R (1/T2 - 1/T1)

P1 = initial pressure

P2 = final pressure

ΔHvap =  enthalpy of vaporization

T2 = final temperature

T1 = initial temperature

ln(1/P2) = 35.2 * 10^3/8.314 (1/338 - 1/307)

ln(1/P2) = 4234(0.00295 - 0.00326)

ln(1/P2) = -1.31

1/P2 = e^-1.31

P2 = 1/e^-1.31

P2 = 3.7 atm

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