How many kg are in 10 pounds

Answer:

From an object with a high temperature to an object with a lower temperature.

Explanation:

Answer:

Chlorine

Explanation:

Chlorine has the electron configuration 1s2 2s2 2p6 3s2 3p5. This is because it has 17 electrons.

Answer: The element having given electron configuration is chlorine.

Explanation:

Electronic configuration tells us about the number of electrons that are present in an atom. It also determines the atomic number of an element.

We are given:

Electronic configuration of element = [tex]1s^22s^22p^63s^23p^5[/tex]

Total number of electrons in the given element = (2 + 2 + 6 + 2 + 5) = 17

Element having atomic number '17' is chlorine

Hence, the element having given configuration is chlorine

Answer:

Option A= copper

Explanation:

According  to specific heat capacity of substances, copper will reach to the our body temperature first.

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m × c × ΔT

specific heat capacity of copper = 0.385 J/g. °C

specific heat capacity of aluminium = 0.902 J/g. °C

so copper will absorb the heat very quickly and raise the temperature in very less time as compare to aluminium.

Final answer:

Copper reaches body temperature before aluminum because it requires less heat to increase its temperature due to its lower specific heat capacity.

Explanation:

The student is asking which metal, copper or aluminum, each weighing one gram and initially at 0° C, will reach body temperature first if they both absorb heat at the same rate. This question is related to thermal properties of materials, specifically specific heat capacity, which indicates the amount of heat required to raise the temperature of a certain mass of a substance by one degree Celsius.

Copper has a lower specific heat capacity (0.386 J/g°C) compared to aluminum (0.900 J/g°C), as indicated by the given data. Therefore, copper will reach body temperature before aluminum because it needs less heat to raise its temperature.

Answer:

C. a spectrum of many different colors of light.

Explanation:

White light is made up of all the colors and all wavelengths.

Answer:

c

Explanation:

Answer:

Intermolecular

Explanation:

Intermolecular forces are the forces operating between the two molecules.  These forces are of short rang forces and also known as week intermolecular forces.

These forces only exist when molecules get close together by force of by cooling.

Example:

Hydrogen bond (intermolecular forces) exist in liquid water molecules but when we heat it the water molecule escape from surface by as hydrogen bond break by heating.

Compressed Natural Gas:

In this case the molecules of natural gas presses and the come closer so the distance between the molecules become less and force of attraction increase that attraction (intermolecular force ) is due to short distance.

The attractive forces that come into play as atoms or molecules move closer together are called intermolecular (Option A) forces, which are vital for determining a substance's physical properties.

The attractive forces between atoms or molecules as they move closer together are called intermolecular forces. These forces are electrostatic in nature, which means they arise from the interactions between positively and negatively charged species. Intermolecular forces are much weaker than the bonds within molecules (intramolecular forces), but they are essential in determining physical properties such as the state of matter.

Intermolecular forces are especially significant in solids and liquids, where the proximity of the molecules leads to a cumulative effect, making these forces quite substantial. In gases, these interactions become noteworthy only at very high pressures, where they cause deviations from the ideal gas law as real gases exhibit behavior that differs from the theoretical ideal.

Answer:

When the particles of a solution or a mixture are so small that they cannot be seen directly from our naked eyes the mixture was formed due called colloid. These are heterogeneous mixtures.

Explanation:

There are different methods to tell a mixture from compound and in this case it is done by passing light through it. When a beam of light is passed through this mixture the particles although being small all are enough such that scattering of the beam takes place and its path can be seen.  

Answer: Energy transfers from the metal to the water and calorimeter until they are all at room temperature.

Explanation: hope this helps

Answer:

CH4, which is the molecular formula for Methane

CH₄ is the correct molecular formula for a compound that contains one atom of carbon and four atoms of hydrogen. Therefore, option A is correct.

The molecular formula is an expression that specifies the number of atoms of each element in a compound molecule. It displays the exact number of atoms in a molecule. Propane, for example, has the molecular formula C₄H₁₀. The given compound contains four carbon atoms and ten hydrogen atoms according to this formula.

A molecular formula tells us which atoms are present in a molecule and how many of each type of atom are present. When there is only one atom of a given type, no subscript is used.

Methane (CH₄) is the most basic hydrocarbon, with one carbon atom and four hydrogen atoms. Methane is an extremely potent greenhouse gas.

Thus, option A is correct.

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Answer:

0.00125 liters of product

Explanation:

So the question it tell you that 0.25 % from 0.5 liters is pure product.

So we calculate the volume of pure product:

volume = (0.25 / 100) × 0.5 = 0.00125 liters

Now to produce the solution over 0.00125 liters of pure product you add (most likely) water until you reach a volume of 0.5 liters.

Answer:

6.06miles

Explanation:

Given parameters:

Speed of the car = 39km/hr

Time = 15minutes

Unkown:

Distance in miles

Solution:

  Speed is the change in distance with time.

             Speed = [tex]\frac{Distance }{Time}[/tex]

We need to express our parameters in the same workable units. So we should convert the given time to hour.

          60min = 1hr

          15 min = 0.25hr

   Therefore:

           Distance = speed x time = 39km/hr x 0.25hr = 9.75km

Now convert km to miles

                      1.609km = 1mile

                        9.75km =  [tex]\frac{9.75 }{1.609}[/tex] , 6.06miles

Answer:

123lb

Explanation:

lb= 2.2046 kg

56×2.2046= 123lb

A person with a mass of 56 kg weighs approximately 123.46 pounds.

The conversion uses the factor that 1 kilogram is approximately 2.20462 pounds. Mass is the amount of matter, while weight is the gravitational force on that matter.

To convert a person's mass from kilograms to pounds, you can use the conversion factor that 1 kilogram is approximately equivalent to 2.20462 pounds.

Conversion Calculation:

Given a mass of 56 kg, you can calculate the weight in pounds as follows:

Weight in pounds = Mass in kilograms × Conversion factor

Weight in pounds = 56 kg × 2.20462 lbs/kg

Weight in pounds ≈ 123.46 lbs

So, a person with a mass of 56 kg weighs approximately 123.46 pounds.

Understanding Mass and Weight:

Note that mass is a measure of the amount of matter in an object, while weight is the force exerted by gravity on that mass. In the US customary units, weight can be expressed in pounds, where 1 lb is equivalent to a mass of 0.4536 kg.

PV = nRT

where P is the pressure,

V is the volume,

n is the moles of gas,

R is the gas constant,

and T is the temperature.

We must relate this equation to a sample of gas at two different volumes however. Looking at the equation, we can relate the change in volume by:

P1V1 = P2V2

where P1 is the initial pressure,

V1 is the initial volume,

P2 is the final pressure,

and V2 is the final volume.

Looking at this relationship, pressure and volume have an indirect relationship; when one goes up, the other goes down. In that case, we can use this equation to solve for the new pressure.

P1V1 = P2V2

(759 mm Hg)(1.04 L) = P2(2.24 L)

P2 = 352 mm Hg (rounded to three significant figures)

To find the pressure in the expanded gas sample, you can use Boyle's Law: P1V1 = P2V2. Plugging in the values, the pressure in the expanded gas sample is 353.03 mm Hg.

To find the pressure in the expanded gas sample, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature. This means that as the volume increases, the pressure decreases, and vice versa.

Using the formula P1V1 = P2V2 (where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume), we can solve for P2:

P2 = P1V1/V2

Plugging in the given values, P1 = 759 mm Hg, V1 = 1.04 L, and V2 = 2.24 L:

P2 = (759 mm Hg)(1.04 L)/(2.24 L) = 353.03 mm Hg

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Answer:

The element oxidized is the one whose oxidation number INCREASES......

Explanation:

And thus......

+

I

I

  2CuO

+

C

→

2

0

C

u

+

C

O

2

↑

⏐

⏐

And here while copper (as  

C

u

2

+

) is reduced, carbon is oxidized,  

0

C

→

+

I

V

C

.

The second reaction represents the reduction  

C

r

(

V

I

+

)

to  

C

r

(

I

I

I

+

)

C

r

2

O

2

−

7

+

14

H

+

+

6

e

−

→

2

C

r

3

+

+

7

H

2

O

(

i

i

)

And the oxidation of ethanol to carbon dioxide:

H

3

C

−

C

H

2

O

H

+

H

2

O

→

2

C

O

2

+

8

H

+

+

8

e

−

(

i

i

i

)

i.e.  

H

3

−

I

I

I

C

−

−

I

C

H

2

O

H

→

2

+

I

V

C

O

2

We takes  

4

×

(

i

i

)

+

3

×

(

i

i

i

)

to eliminate the electrons.....

3

H

3

CC

H

2

O

H

+

3

H

2

O

+

4

C

r

2

O

2

−

7

+

56

H

+

+

24

e

−

→

8

C

r

3

+

+

28

H

2

O

+

6

C

O

2

+

24

H

+

+

24

e

−

To give finally............

3

H

3

CC

H

2

O

H

+

4

C

r

2

O

2

−

7

+

32

H

+

→

8

C

r

3

+

+

25

H

2

O

+

6

C

O

2

Dichromate ion

is reduced to  

chromic ion

The oxidation takes place in option B (Fe2O3 + 3CO - 2Fe + 3CO2) where Carbon (C) in CO gets oxidized to CO2 moving from an oxidation state of +2 to +4.

In Chemistry, an oxidation reaction is characterized by the loss of electrons during the reaction. Looking into the provided options for reactions, we can understand which compound gets oxidized by observing which substance loses electrons (i.e., has a valence increase).

Option A cannot be the answer since copper (Cu) reduces from Cu to Cu and carbon (C) also reduces from atomic state to be part of CO2.

Option B, (Fe2O3 + 3CO - 2Fe + 3CO2), showcases oxidation. In this case, Carbon (C) in CO is getting oxidized to form CO2. In the process of this reaction, Carbon (C) changes from an oxidation state of +2 (in CO) to +4 (in CO2).

Option C, shows the reduction of Mg from atomic state to ionic state in MgO. Option D, shows Mn reducing from +4 oxidation state to +2 oxidation state in MnCl2, with Cl also transforming component state. However, none of these are examples of oxidation.

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Answer:

0.00576

Explanation:

To round 0.005758 to three significant figures, we get 0.00576. We only consider the first non-zero digit and the two digits to its right for this purpose.

To round the number 0.005758 to three significant figures, we first locate the first non-zero digit from the left, which is 5. We then count two more digits to its right, thus including 7 and 5. We denote these as the significant figures. The next digit after these is 8, since it is more than 5, it rounds the prior digit (5) up by one. Therefore, the number 0.005758 rounded to three significant figures is 0.00576.

Leading zeros are not considered as significant figures. The significant figures in a number are digits that carry meaning contributing to its precision. This includes all non-zero numbers, zeros between significant figures, and any trailing zeros if the number is a decimal.

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Answer:

the red one in each pair

Explanation:

see the picture2

Answer:

Here's what I find.

Explanation:

8. Electron affinity

The atom that is closer to having a complete valence shell (is further to the right in the Periodic Table) will have the greater electron density. The correct answers are:

(a) Br  

(b) Si

(c) Cl

9. Atomic radius

(a) Ca.  Ca is one period closer to the bottom of the Periodic Table. It has one more electron shell than Mg, so its valence electrons are further from the nucleus.

(b) Al. P is two atoms to the right of Al, so it has two more protons in the nucleus. Its valence electrons are held more tightly, so it is the smaller atom.

(c) F⁻. An anion is always larger than its neutral atom the added electron increases electron repulsions. The electrons move further out so they can reduce these repulsions.

10. Ionization energy

(a) He.  He is  a smaller atom, so its electrons are closer to the nucleus and more difficult to remove.

(b) Mg. Mg is to the right of Na and has a filled 3s subshell. Both factors make it more difficult to remove an electron.

(c) Ca²⁺. Once you have removed the two valence electrons from an atom of Ca, you have exposed its argon-like inner core. It takes more energy to remove an electron from a completed shell.

Answer:

The volume is 3.96 dL

Explanation:

Step 1: Convert ml to dl

1Liter = 1000ml = 10³ ml

1Liter = 10 dl

⇒ 1 Liter has 1000ml or 10 dl

⇒ The ratio can be written as : 10dl/ 1000ml = 1 dl / 100ml

Step 2: Convert cm³ =

⇒ 1cm³ is equal to 1 ml.

Step 3:  Calculate volume

⇒ We use the formule of density here, which is : Density (p) = mass (g) / volume( cm³)

⇒ 7.86 g/ cm³  = 3110 grams / Volume ( cm³)

⇒Volume = 3110 grams / 7.86g/cm³ = 395.67 cm³

395.67 cm³ = 395.67 ml = 0.39567 L  = 3.96 dL

3.96 dL is reported to three significant digits due to the precision reported for the density.

To determine if a crown is made of solid gold, you can measure its density or look for certain markings or stamps indicating its purity.

One way to determine if a crown is made of solid gold is to measure its density. Gold has a density of 19.3 g which is higher than most other metals. To find the density of the crown, you need to measure its mass using a balance and its volume using water displacement. If the density of the crown matches the density of gold, it is likely made of solid gold.

Another way to determine if the crown is made of solid gold is to look for certain markings or stamps. In many countries, solid gold items are required to have a hallmark, which indicates the purity of the gold. This hallmark can usually be found on the inside of the crown. It is important to note that these methods provide a good indication but cannot guarantee with absolute certainty if a crown is made of solid gold.

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Answer:

it will explode

Explanation:

the ingredients in sulphate and most sodas dont mix. they will clash, and explode.making a HUGE mess.

When caustic soda reacts with sulfur, it forms sodium sulfide and water.

When caustic soda is reacted with sulfur, it forms sodium sulfide and water as shown in the chemical equation: 2NaOH + S → Na2S + 2H2O.

Sulfur reacts with caustic soda to produce sodium sulfide.

6 meters is a longer distance. It takes 100 centimeters to equal 1 meter.

HOPE IT HELPS :)

Answer:

1. Color Change

2. Change in temperature

3. Noticiable Odor

4. Formation of bubbles

A chemical change, usually irreversible, results in the formation of new substances, the release or absorption of energy, and sometimes the production of gases or solids. Indicators of a chemical change include changes in color, production of a gas, formation of a precipitate, and changes in temperature.

A chemical change is a process that results in the transformation of one set of chemical substances to another. During this type of change, the atoms in the reactants rearrange to form one or more different substances, and this is usually an irreversible process. Some common results of a chemical change can include the formation of new substances, the release or absorption of energy, and the production of gases or solid materials.

Four indicators of a chemical change are:

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Answer:

average atomic mass of sulfur = 32.066 amu

Explanation:

The average atomic mass is calculated as following:

average atomic mass = fraction of isotope (1) × mass number of the isotope (1) + fraction of isotope (2) × mass number of the isotope (2) + ... + fraction of isotope (n) × mass number of the isotope (n)

average atomic mass of sulfur = (95/100) × 32 + (0.76/100) × 33 + (3.22/100) × 34 + (0.89/100) × 36 = 32.066 amu

(amu - atomic mass units)

Answer: A.Estimate measurements to the nearest 0.05cm

D.start all measurements from the zero (0) mark

For Edg

Explanation:

Answer:

Everything is composed of atoms, that are the indivisible building blocks of matter that cannot be destroyed. All atoms of an element are identical.

Explanation:

The moss leaf cells contain cell wall, nucleus, chloroplasts, and cell membrane.

The moss leaf cells contain the following cell structures:

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Moss leaf cells contain a cell wall, a nucleus, chloroplasts, mitochondria, and a cell membrane. The cell wall provides structure, the nucleus acts as the command center, chloroplasts facilitate photosynthesis, mitochondria produce energy, and the cell membrane controls substance movement.

Moss leaf cells contain several common structures seen in plant cells. They have a cell wall, which is primarily composed of cellulose and serves functions such as protection, providing structural support, and giving shape to the cells.

These cells also contain a nucleus, which is the control center of the cell. There are chloroplasts present in moss leaf cells; this is where photosynthesis takes place, allowing the plant to convert sunlight into energy. Moss leaf cells also have mitochondria, which are the powerhouses of cells as they are responsible for producing energy in the form of ATP. Finally, these cells have a cell membrane, which is the semipermeable membrane surrounding the cytoplasm of the cell, controlling the movement of substances in and out of the cell.

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Answer:

Protons: 79

Electrons: 78

Explanation:

1. The number of protons is the atomic number (The atomic number for Au on the periodic table is 79)

2. Since the charge is +1 (positive) it means that there's one more proton than electrons. So, 79-1 = 78 electrons

Answer:

Acetone is a compound.

Acetone is a compound comprising of carbon,hydrogen and oxygen atoms.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

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Final answer:

OPTION B.

Dalton's atomic theory highlighted that atoms are the smallest indivisible units of matter and that they combine in whole number ratios to form compounds.

Explanation:

One main point of Dalton's atomic theory is that atoms made up the smallest form of matter. Dalton proposed that all matter is composed of these minute, indivisible particles, which he referred to as atoms, and these atoms cannot be subdivided, created, or destroyed. This concept also suggested that atoms of a given element are identical in size, mass, and other properties, whilst atoms of different elements differ. Additionally, Dalton's theory asserted that atoms of different elements can combine in whole number ratios to form chemical compounds and that during chemical reactions, atoms are rearranged but neither created nor destroyed.

Answer:

Arsenic is present in p block and group fifteen of periodic table.

Explanation:

The atomic number of Arsenic is 33.

According to the Aufbau principal in ground state of elements electron first occupy the lower energy level then fill the higher energy levels. We know that there four subshells s, p, d and f. The maximum number of electrons in these subshells can be calculated by following formula:

2 (2l +1 )

and l = 0,1,2,3,....

maximum numbers of electrons in s subshell are,

l=0

2 ( 2(0) + 1)

2

so maximum electrons in s subshell are 2.

maximum numbers of electrons in p subshell are,

l = 1

2 ( 2(1) + 1)

2( 2 + 1)

6

so maximum electrons in p subshell are 6.

maximum numbers of electrons in d subshell are,

l = 2

2 ( 2(2) + 1)

2( 4 + 1)

10

so maximum electrons in d subshell are 10.

maximum numbers of electrons in f subshell are,

l = 3

2 ( 2(3) + 1)

2( 6 + 1)

14

so maximum electrons in f subshell are 14.

Electron first fill 1s subshell then 2s subshell and in this way they goes to higher energy levels.

Electronic configuration of Arsenic:

1s2 2s2 2p6 3s2 3p6 4s2 3d10, 4p3

The last electron is present in p subshell that's way Arsenic is present in p block of periodic table.

P block elements are non-metals, metals and metalloids. These are thirty five elements. The P-block elements are present on right side of periodic table. There valance electrons are present in P orbital. The p-block metals are shiny and good conductor of heat and electricity. These metal lose the electron which is accept by non metals and form ionic bond. They have high melting points.

Metalloids includes boron, silicon, germanium, arsenic, antimony and tellurium. Metalloids contain both the properties of metals and non metals, Some metalloids are toxic like arsenic.

Most of p-block elements are non metals. They are bad conductor of heat and electricity and have low boiling points.

Arsenic is in the p-block of the periodic table. This is because its last electron occupies the 4p level, which is characteristic of p-block elements.

The periodic table is divided into four blocks based on the type of atomic orbital that is being filled with electrons: s-block, p-block, d-block, and f-block. In the case of arsenic, which has an atomic number of 33, the electron configuration can be written as [Ar]4s² 3d¹⁰ 4p³. Here, the last three electrons are added to the 4p subshell after filling the 4s and 3d subshells.

The presence of the three electrons in the 4p orbital indicates that arsenic belongs to group 15 (or group V in older notation), which includes other elements such as nitrogen, phosphorus, and antimony. The properties of p-block elements, including their tendency to form covalent bonds and various oxidation states, are influenced by their electron configuration, especially the behavior of the p electrons.