Why don’t pressurized steel cylinders of hydrogen quickly (or even gradually) lose their
contents?

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

Answer:

False

Explanation:

They need a large amount of energy because they're constantly working

Answer:

false

Explanation:

Answer:

They have same volume

Explanation:

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

These objects will have the same volume (amount of space occupied) irrespective of their shapes. This occurs if only occupy fluids of the same density.

There are 3.01 × 10¹⁷ moles of AlCl₃ in 1.81 × 10⁴¹ molecules of AlCl₃.

The moles of a substance can be calculated by dividing the number of molecules in the substance by Avogadro's number as follows:

no of moles = no of molecules ÷ 6.02 × 10²³

According to this question, there are 1.81 × 10⁴¹ molecules of AlCl₃. The number of moles in this substance can be calculated as follows;

no of moles = 1.81 × 10⁴¹ ÷ 6.02 × 10²³

no of moles = 0.301 × 10¹⁸

no of moles = 3.01 × 10¹⁷ moles

Therefore, there are 3.01 × 10¹⁷ moles of AlCl₃ in 1.81 × 10⁴¹ molecules of AlCl₃.

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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:

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 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 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 IUPAC name of the compound is 1- ethyl-3-methyl-cyclohexane.

An alkane is a compound that is composed of only carbon and hydrogen. The alkane could be an acyclic compound or a cyclic compound. A cyclic compound is one that has the carbon atoms arranged to form a given shape.

The compound now has the carbon atoms at the vertices of the shape. There could also be substituents that are attached to the cyclic compound. If we look at the image as shown, we can see that position 1 has the ethyl substituent and position 3 has the methyl substituent.

With this in mind, we could now properly name the compound as; 1- ethyl-3-methyl-cyclohexane.

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as per the given values ,ph of this solution is 13.18

We have  [OH−]=1.49 x10⁻¹ M 

Using formula, the  pOH is

:pOH=−log[OH−]

          =−log(1.49 x10⁻¹ M)≈ 0.82

Now, at any temperature, pH+pOH=pKw 

.Assuming standard conditions,  pKw=14 .

As such, the pH is ==> pH+pOH=pKw

                        pH=pKw−pOH

                              =14-0.82

                              ≈13.18

pH is a measure of  acidic/basic nature of solution . It ranges  from 0 - 14, with 7 being neutral. pH of less than 7 means  acidity, whereas a pH of greater than 7  basic solution . pH is  a measure of the relative amount of free hydrogen and hydroxyl ions in the water
.
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The masses and volume of the required reagent are as follows:

The mass in grams of KCIO₃ needed to produce 2.56 grams of O₂ is determined from the mole ratio of the reaction as given in the equation of reaction below:

2 KCIO₃ (s) → 2 KCl (s) + 3 O₂ (s)

From the equation of reaction, 2 mole of KCIO₃ produces 3 moles of O₂.

Moles of O₂ in 2.56 grams = 2.56/32

Moles of O₂ in 2.56 grams = 0.08 moles

Moles of KCIO₃ required = 0.08 * 2/3

Moles of KCIO₃ required = 0.0533 moles

molar mass of KCIO₃ = 122.5 g/mol

Mass of KCIO₃ required = 0.0533 * 122.5

Mass of KCIO₃ required = 6.53 g

Mass of precipitate formed when 25.00 mL of 0.200M BaCl₂ and 35.00 ml. of 0.125 M Na₂SO₄ are mixed is determined as follows:

BaCl₂ (aq) + Na₂SO₄ → BaSO₄ (s) + 2 NaCl (aq)

Moles of BaCl₂ reacting = 25.00 mL * 1 L/1000 mL * 0.200M

Moles of BaCl₂ reacting = 0.005 moles

Moles of Na₂SO₄ reacting = 35.00 mL * 1 L/1000 mL * 0.125 M

Moles of Na₂SO₄ reacting = 0.4375 moles

Na₂SO₄ is the limiting reactant and moles of BaSO₄ precipitate formed = 0.4375 moles

molar mass of BaSO₄ = 233 g/mol

mass of BaSO₄ precipitate formed = 0.4375 moles * 233 g/mol

mass of BaSO₄ precipitate formed = 1.02 g

Volume of 0.250 M KCl (aq) that will completely react with 50.0 ml.

of 0.115M Pb(NO₃)₂ (aq) is determined as follows:

Pb²⁺ (aq) + 2Cl⁻ (aq) → PbCl (s)

Moles of Pb(NO₃)₂ = 50 ml * 1 L/1000 mL * 0.115 M

Moles of Pb(NO₃)₂  = 0.00575 moles

Moles of KCl required = 2 *  0.00575 moles

Moles of KCl required = 0.0115 moles

Volume of KCl required = 0.0115/0.250

Volume of KCl required = 0.046 L

Volume of KCl required = 46.0 mL

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The name of the compound is 1 chloro-3- cyclohexane and it is most stable in the equatorial conformation.

A model is a representation of a compound. The model shows us the way that the atoms in the compound are arranged. Thee bonds could be shown by the use of the following kinds of model in science;

1) The ball and stick model

2) The space filling model

Now we know that the model could both serve as a tool for representation as well as a tool of explanation. We could use the model of the molecule to understand the chemical interactions that could be possible for the molecule that is under study.

What we have here is a ball and stick model of the compound 1 chloro-3- cyclohexane

The conformation of the molecule is an indicator of how stable the compound would be. In this case, the more stable conformation of the compound would be the equatorial conformation.

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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.

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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Geese flying south for the winter is migration kind of adaptation the annual, large-scale movement of birds between their breeding (summer) homes and their nonbreeding (winter) grounds.

Adaptation results from evolution. Evolution causes a species to change over a long period of time. Usually, mutations or unintentional gene alterations result in adaptations. Depending on the mutation, a plant or animal may be able to live longer than other members of its species.

Adaptations might be behavioural or physical. Any structural change made to a body part qualifies as a physical adaptation. An animal will often make a response in response to some sort of external stimulation.

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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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Light can travel up to 671 million in the time of one hour.

speed of light, the rate at which light rays move through various substances. Specifically, the speed of light within a vacuum is presently calculated to be 299,792,458 meters per second.

One of nature's basic constants is the speed of light. Its importance extends well beyond its use in characterizing one aspect of electromagnetic waves. It acts as the universe's only limiting velocity, setting an upper limit on both the speed of all material atoms and the speed at which signals may travel. The speed of light (c) acts as a proportional constant in the well-known relativity equation, E = mc^2, connecting the heretofore dissimilar ideas of mass (m) and energy (E) (E).

Therefore, the speed of light is 671 miles per hour.

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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:

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: He concluded  it was dense but not massive

Explanation: Rutherford concluded that his metal foil experiment was that most of an atom was empty-spaced with a tiny, dense, positively charged nucleus at the center that contains the mass of most atoms.

Hope this Helps u3u

Answer:

58.) 2,727.9

Explanation:

although I am not sure but that's what my calculations say so

- - - - - - - - - - - - - - - - - - - - - - - -

For 58:

Pretend some zeros aren't there. It helps quite a bit!

For example:

3000 - 272.1 = 2730

300 - 27.21 = 273

Just don't forget to put them back, and it works great!

- - - - - - - - - - - - - - - - - - - - - - - -

~pinetreee

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 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 pair of compounds with same empirical formula will be CH3 and C2H6

Empirical formula of a specific compound is defined as the positive integer ratio of atoms that can be found in that specific compound.

Therefore, from the given option above,

The pair of compounds has the same empirical formula is

CH3 and C3H6

The empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound.

The empirical formula of a compound can be exemplified using sulfur monoxide, which would simply be SO, as is the empirical formula of disulfur dioxide, S₂O₂.

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CH3 and C2H6 will be the compounds that have the same empirical formula one another. Option B

The positive integer ratio of atoms that can be found in a certain compound is what is meant to be understood when speaking about the empirical formula of that particular chemical.

Therefore, based on the alternative presented before,

The empirical formulas of the two compounds are identical to one another.

CH3 as well as C3H6

The empirical formula of a chemical compound is the most straightforward representation of the atomic number distribution in the molecule as a whole.

An example of an empirical formula for a molecule is the chemical symbol SO, which stands for sulfur monoxide. Another example is the empirical formula for disulfur dioxide, which is written as S2O2.

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