The blue underlined part of the chemical formula above represents a(n) ______________.

A) Molecule
B) Equation
C) Subscript
D) Coefficient

Answer: Option (B) is the correct answer.

Explanation:

An atoms consists of protons, neutrons and electrons. Protons are positively charged, neutrons have no charge and electrons are negatively charged.

Also, when an atom is neutral then there are equal number of protons and electrons.

For example, a neutral sodium atom has 11 protons and 11 electrons.

Therefore, we can conclude that modern atomic theory states that atoms are neutral as they have equal number of protons and electrons.

Final answer:

The wavelength in a longitudinal wave is the distance from one compression to the next compression or from one rarefaction to the next rarefaction.

Explanation:

In a longitudinal wave, the wavelength is the distance from one compression to the next compression or from one rarefaction to the next rarefaction. This is akin to the peak to peak or trough to trough measurement in transverse waves.

Within the cycle of a longitudinal wave, areas of high pressure, or compressions, where the particles are closest together, and areas of low pressure, or rarefactions, where the particles are further apart, alternate regularly. Consequently, the wavelength can be perceived as the spatial period of the wave—the distance over which the wave's shape repeats.

The understanding of these concepts is crucial for analyzing wave behaviors, such as sound propagation, and the impacts of phenomena like the Doppler effect.

Hey There!:

The density is the quotient between the mass of a material and the volume occupied by it, The density can be expressed for a substance or for a mixture of substances. For example, water density in ambient conditions is equal to 1.00 g/cm3, which means that in 1 cm³ or 1 mL, there are 1.0 g of water. Therefore:

D = m / V

D = 20 g / 5 mL

D = 4,0 g/mL

hope that helps!

The density of the object will be "4 g/mL". A further solution is provided below.

The given values in the question are:

Mass,

M = 20 g

Volume,

V = 5 mL

The density of the object will be:

→ [tex]Density = \frac{Mass}{Volume}[/tex]

By substituting the values, we get

→               [tex]= \frac{20}{5}[/tex]

→               [tex]= 4 \ g/mL[/tex]

Thus the above answer is right.

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Hello!

To find the average atomic mass of boron, we need to use this formula:

Average Mass = (mass of isotope #1)(percent abundance) + (mass of isotope #2)(percent abundance) + ...

Before we use the formula, we need to convert the percentages into decimals. Remember that all percentages are out of 100, so, we divide the percent by 100 to get it into decimal form.

19.8 / 100 = 0.198

80.2 / 100 = 0.802

Average Mass = (10.013 amu)(0.198) + (11.009 amu)(0.802)

Average Mass = 1.98 amu + 8.83 amu

Average Mass = 10.81 amu

Therefore, the average atomic mass of boron is 10.81 amu.

10.8 amu is the atomic mass of boron.

Given:

The two isotopes of boron (B).

Boron-10 has an abundance of 19.8% and Boron -11 has an abundance of 80.2%

To find:

The atomic mass of europium.

Solution:

Mass of Boron-10 = 10.013 amu

The percentage abundance of Boron-10 = 19.8%

The fractional abundance of Boron-10 =0.198

Mass of Boron-11 = 11.009 amu

The percentage abundance of Boron-11= 80.2%

The fractional abundance of Boron-11= 0.802

The average atomic mass of Boron = A.M

[tex]A.M=\Sum{\text{Mass of isotope }\times \text{Fractional abundance of isotope}}\\=10.013 amu\times 0.198+ 11.009 amu\times 0.802=10.81 u\approx 10.8amu[/tex]

10.8 amu is the atomic mass of boron.

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most solids contract (shrink) when they get cold.

        Density  =  (mass) / (volume)

If mass doesn't change but volume gets smaller,  then density increases.

Answer:  

F. The baking soda combined with the hydrochloric acid and bubbles formed.

Explanation:

The formation of gas bubbles is usually a sign of a chemical reaction.

G. is wrong because the absorption of a liquid by a solid is a physical process. Think of using a paper towel to clean up spilled water.

H. is wrong because the dissolving of a solid is a physical process. Think of dissolving sugar in your coffee.

J. is wrong because evaporation is a physical process. Think of a puddle of water drying up in the hot sun.

There are two terms

a) accuracy : it relates to the exactness of an answer that how an answer is close to the actual answer or actual reading

So 104.6 is accurate

b) Precision : This is related to the closeness of different readings with each other

The first reading is 103.7 and the second one is 108.4  so the second reading is quite different from the first reading so it cannot be called as precised

Again 105.8 has good difference from the second reading hence again this is not precised

However the last reading 104.6 is quite near to 105.8 so 104.6 can be called as precise

105.8°C is the most precise measurement.

Actual temperature is 105.1°C and recorded values are:

By looking at values 105.8C is nearest to actual value. So it is precise one.

Hey There!

aA => bB

[A]o  = 2.80*10⁻³ M

When drew  a plot  1 / [A]t versus time  resulted  a straight line inidicates  second order reation .

Therefore , Rate = K[A]²

Answer A

Hope that helps!

Answer:

The reaction is second order.

The rate law is:

[tex]Rate=K[A]^{2}[/tex]

Explanation:

The following plots and line shows the order of reaction

a) if we are getting a straight line in a plot with concentration versus time, the order of reaction is zero.

b) if we are getting a straight line in a plot with ln(concentration) versus time, the order of reaction is one.

c) if we are getting a straight line in a plot with inverse of concentration versus time, the order of reaction is two.

The reaction is second order.

The rate law is:

[tex]Rate=K[A]^{2}[/tex]

Answer;

= C3H5

Explanation and solution;

1 mole of CO2 contains 44 g, of which 12 g are carbon

Thus, mass of carbon in 9.32 g will be;

(12/44) × 9.32 g = 2.542 g

Mass of Hydrogen in 3.18 g of water;

= (2/18) × 3.18 g = 0.353 g

we then find the number of moles;

Moles of carbon ; 2.542 /12 = 0.2118 moles

Moles of Hydrogen = 0.353 moles

The ratios of C ; H ;

= 1 :  0.353 /0.2118

= 1 : 5/3

= 3: 5

Therefore; the empirical formula of the hydrogen carbon is; C3H5

Mass of CO₂ = 9.32g

Molar mass of CO₂ = 44 g/mol

Mass of H₂O = 3.18 g

Molar mass of H₂O = 18 g/mol

Moles = mass/ molar mass

9.32 g CO₂ x (1 mol CO₂ / 44 g CO₂) = 0.2118 mol CO₂  

Every CO₂ molecule has 1 Carbon atom, therefore 0.2118 mol of CO₂ will have 0.2118 moles of C  

3.18 g H₂O x (1 mol H₂O / 18 g H₂O) = 0.177 mol H₂O  

In every H₂O molecule there are 2 atoms of H therefore 0.177 mol of H₂O will have 2 x 0.177 or 0.354 moles of H

Now the ratio of C : H  = 0.2118 : 0.354

To get the whole number we divide both numbers in the ratio by the lowest number.    

C : H  

= (0.2118/0.2118) : (0.354 / 0.2118)  

= 1:1 .67

Since we cannot round, we multiply by 3 to clear the fraction:  

C= 1 x 3 =3

H = 1.67 x 3 = 5

Thus the empirical formula is C₃H₅.

The process of cell division is different in prokaryotes and eukaryotes as prokaryotes have a primitive cell structure which is not membrane bound. In eukaryotes the process of cell division is termed as mitosis. In prokaryotic cells like a bacterial cell, the cell divides by a process called binary fission, where each cell is cleaved into two identical cells each with its own chromosomal set.  Budding is process of asexual reproduction and is different from cell division.

Therefore, the correct answer will be a. binary fission.

Al2O3 has a higher melting point than Na2O. This is because the ionic bond between Al3+ ions and O2- ions is stronger than that between Na+ and O2-. The charge on the Al3+ ion is larger than that of the Na+ ion

Aluminium oxide has a higher melting point than sodium oxide due to the stronger bonding in its crystal lattice and higher lattice energy, which requires more energy to break the bonds during melting.

The reason why aluminium oxide (Al2O3) has a higher melting point than sodium oxide (Na2O) lies in their different types of bonding and bond strengths. Al2O3 is an ionic compound but with some covalent character, meaning that it has stronger bonds and thus requires more energy to break those bonds, leading to a higher melting point. This difference is largely a result of the contrast in the charge and size of the ions involved.

In contrast, Na2O is purely ionic and made up of larger ions with a lower charge. Consequently, Na2O has a weaker lattice energy than Al2O3, implying that less energy is needed to break the bonds in its structure, resulting in a lower melting point.

Furthermore, lattice energy is directly related to melting points in ionic substances that have similar structures. This underlines why Al2O3 with its higher lattice energy has a higher melting point compared to Na2O.

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21% oxygen can i be brainest pls

the percentage of oxygen in the air is 20.95%

nitrogen 78.09%

argon 0.93%

carbon 0.04%

water vapor 1%

Answer:- B. 0.343

Solution:- Hot metal is added to water so the heat is gained by water and lost by the metal. We assume no heat is lost to the surroundings, so the heat lost by metal is totally used to raise the temperature of water.

First, we will calculate the heat gained by water using the formula:

[tex]q=mc\Delta T[/tex]

where, q is the heat energy, m is the mass, c is specific heat and delta T is change in temperature.

For water:

m = 8.4 g

c = [tex]\frac{4.184J}{g.^0C}[/tex]

[tex]\Delta T=52.1-20=32.1 ^0C[/tex]

Let's plug in the values and calculate q  for water:

[tex]q=(8.4g)(\frac{4.184J}{g.^0C})(32.1^0C)[/tex]

= 1128.17 J

Same amount of heat is lost by the metal. Mass of metal is 68.6 g.

[tex]\Delta T=100-52.1=47.9^0C[/tex]

let's plug in the values in the same formula and calculate the specific heat of metal:

[tex]1128.17J=(68.6g)(c)(47.9^0C)[/tex]

[tex]c=\frac{1128.17J}{(68.6g)(47.9^0C)}[/tex]

[tex]c=\frac{0.343J}{g.^0C}[/tex]

So, the right choice is B.0.343.

Answer:

B

Explanation:

Got it right on ODY(Oddesyware) ;) have an amazing day y'all

The correct answer should be

D: incredibly

Best Answer:  d  

the subject is who or what you are talking about- the glowing red coals  

the predicate is what they are doing- looked incredibly hot  

looked is your verb because that is what they are doing, how did they look? they looked hot, that is the adverb. the word that describes hot is incredibly, that is the pred adj. because adjectives describe.

A basic salt or alkali sat is any salt that hydrolyzes to form a basic solution.

In simple terms, It is a salt which is when dissolved in water form a solution of PH less than 7.

It contains amounts of both hydroxide and other anions.

White lead is an example. It is basic lead carbonate, or lead carbonate hydroxide.

A basic salt is an ionic compound formed from the reaction of a strong base and a weak acid, resulting in a solution that releases OH⁻ ions, making it basic.

1. Metallic bond is a type of chemical bond.

2. Metallic bond is formed between electrons and positively charged metal ions.

3. Metallic radius is defined as one-half of the distance between the two adjacent metal ions.

4. Metallic bond increace electrical and thermal conductivity.

5. Metals conduct heat, because when free moving electrons gain energy (heat) they vibrate more quickly and can move around.

Hey there!

Given the reaction is :

Cl2(g) +  3 F2(g) = 2 ClF3(g)

The rate of a reaction is given by:

Rate = - Δ[Cl2] / Δt

=  (-1/3  Δ[F2] / Δt )   + ( 1/2  Δ[ClF3] / Δt )

Given that :  Δ[Cl2] / Δt  = - 0.099 M/s

From above rate law:

(- Δ[Cl2] / Δt ) =  ( -1/3  Δ[F2] / Δt )

( Δ[F2] / Δt )  = 3 *  ( Δ[Cl2] / Δt )

= 3 * ( - 0.099 ) =   - 0.297  M/s

Therefore:

Δ[F2]/Δt  = -0.297 M/s

Hope That helps!

The rate of consumption of fluorine in the reaction has been -0.297 M/s.

The balanced chemical equation for the reaction has been:

[tex]\rm Cl_2\;+\;3\;F_2\;\rightarrow\;2\;ClF_3[/tex]

According to the reaction for the formation of 1 mole of chlorine fluoride, 1 mole of chlorine reacts with 3 moles of fluorine.

The amount of fluoride consumed in unit time has been 3 times the amount of chlorine consumed in the same time.

The [tex]\rm \dfrac{\Delta Cl_2}{\Delta t}[/tex] has been given to be -0.099 M/s.

It states that amount of chlorine consumed in 1 sec = 0.099 M.

The negative sign has been implied with the deduction in the concentration of Cl per second.

The amount of fluorine consumed at the same time has been 3 times the amount of Cl consumed.

Fluorine consumed ([tex]\rm \Delta\;F_2[/tex]) = 3 [tex]\times[/tex] 0.099 M

Fluorine consumed = 0.297 M.

The amount of fluorine consumed ([tex]\rm \Delta\;F_2[/tex]) per second is 0.297 M.

The rate of the depletion of fluorine in the reaction can be given as:

[tex]\rm \dfrac{\Delta\;F_2}{\Delta t}[/tex]= -0.297 M/s.

The rate of consumption of fluorine in the reaction has been -0.297 M/s.

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The air escapes into the atmosphere.

An emulsion is a colloidal dispersion of one liquid in another liquid in which it does not dissolve.

Ice cream is essentially an emulsion of the fat in milk with a sugar solution trapped in a network of small ice crystals. Other chemicals are added to prevent the emulsion from separating, and air bubbles are mixed into the semisolid mixture.

Up to 50 % of the volume of ice cream can be air.

When the ice cream melts, the air bubbles are no longer trapped. They just escape into the atmosphere.

If you re-freeze the melted ice cream, its volume will be much less than the original.

Correct answers are

CO32-: Reactant  

H2O:  product

CO2:  product

The 2 in front of H+: Coefficient

Species that occur on the left hand side of the reaction equation are reactants while species that occur on the right hand side of a reaction equation are called products.

A chemical reaction involves the combination of two or more substances to form a new substance(s). Sometimes, a chemical reaction may involves the breaking up a substance into other substances.

Given the reaction;

2H+ + CO32- → H2O + CO2

2H+ and CO32- are reactants while H2O  and CO2 are products. The number 2 is a coefficient.

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In metallic bonding, delocalized electrons move freely which allows metal atoms to slide past each other, making metals ductile due to the metallic bonding forces. This bond involves the attraction between positive metal ions and a sea of delocalized electrons, which also gives metals their conductive and other distinctive properties.

In metallic bonding, electrons move freely between neighboring atoms. This is often described by the 'sea of electrons' model where valence electrons are delocalized over the entire structure. Because these electrons are not attached to any one atom specifically, they allow the metal atoms to slide past each other without breaking the bond. Therefore, metals are not only malleable but also ductile. The ductility of metals is due to the delocalized electrons serving as a buffer, allowing the metal ions to slide past one another when a force is applied, without the crystal structure shattering like what occurs in the more brittle ionic compounds.

These properties are a consequence of the metallic bonding which involves the electrostatic attraction between the positive metal ions and the sea of delocalized electrons surrounding them. The free electron model of metals helps to explain their ability to conduct heat and electricity, as well as their high melting points and density due to the close packing of the positive nuclei and the strong bonding within the metal lattice.

Hey there!

No !! there is nothing to react. What else other than tin sulphate and zinc sulphate can you make - but then you have only what you started with .

Hope that helps!

If a ZnSO4 solution and a SnSO4 solution were mixed there will be no reaction.

Even though zinc is above tin in the electrochemical series, there will be no reaction when a ZnSO4 solution and a SnSO4 solution were mixed because the two compounds have the same anion.

Displacement reaction only occurs when two compounds have different anions and one of the metal cations involved is lower than the other in the electrochemical series.

From the explanation above, it is clear that, if a ZnSO4 solution and a SnSO4 solution were mixed there will be no reaction.

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i think it A. simple

It's either A or B, I hope this helped XD.

The concentration of Bromide from 115.91g of MgBr2 dissolved in 1.31L of water would be around 88558.78 parts per million (ppm).

The subject of your question is related to the concentration calculation in chemistry, specifically describing the parts per million (ppm) concept using the weight of a solute (MgBr2) and the volume of the solvent (water). The conversion involves the understanding of molarity and the usage of the molecular weight (the weight of one mole). In the case of MgBr2, its molar mass is 184.11 g/mol.

To calculate concentration in ppm, you need to use the following formula: (mass of solute/volume of solution) * 10^6. Here, the mass of the solute (MgBr2) is 115.91g and the volume of the solution is 1.31L. So, (115.91 g / 1.31 l) * 10^6 = 88558.78 ppm approximately.

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After dissolving 115.91g of MgBr2 in 1.31L of water, the resulting concentration of bromide ions would be approximately 76704 ppm.

The concentration of a solute in a solution is typically given in parts per million (ppm). The problem at hand is determining the concentration of bromide in a solution formed by dissolving 115.91 g of MgBr2 (magnesium bromide) in 1.31 L of water.

We first need to convert grams of MgBr2 to moles as moles are needed to calculate molarity. The molar mass of MgBr2 is approximately 184.11 g/mol. So, 115.91 g of MgBr2 is equivalent to approximately 0.63 moles of MgBr2.

Recall that MgBr2 will dissociate into Mg2+ and 2 Br- ions in the solution. So, the total moles of Br- in the solution will be 2 * 0.63 mol = 1.26 mol. We can then find the molarity (M) by dividing the total moles of Br- by the volume of the solution in liters. Hence, M = 1.26 mol / 1.31 L = 0.96 M.

Finally, to convert molarity to ppm, we'll multiply by the molar mass of bromide and by a thousand (to account for the definition of ppm). The molar mass of bromide (Br-) is approximately 79.90 g/mol. So, ppm = 0.96 M * 79.90 g/mol * 1000 = 76704 ppm.

Therefore, the concentration of bromide in the solution is 76704 ppm.

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Answer: The average atomic mass of this elements is 56.7221 amu.

Explanation: The average atomic mass is the sum of the masses of its isotopes each multiplied by their natural abundances.

[tex]\text{average atomic mass}=\sum_{i=1}^{n}(mass)_i(\text{Fractional abundance})_i[/tex]            .....(1)

[tex]\text{Fractional abundance}=\frac{\%\text{ abundance}}{100}[/tex]

We are given 3 isotopes of an element.

For Isotope [tex]X^{55}[/tex],

Mass = 55 amu

Fractional abundance = 0.2780

For isotope [tex]X^{57}[/tex],

Mass = 57 amu

Fractional abundance = 0.4439

Total Fractional abundance = 1

For isotope [tex]X^{58}[/tex],

Mass = 58 amu

Fractional abundance = Total abundance - abundances of the other isotopes

Fractional abundance = 1 - 0.7219

                                     = 0.2781

Now, putting all the values in equation 1, we get

[tex]\text{Average atomic mass}= (55 amu\times 0.2780)+(57 amu\times 0.4439)+(58 amu\times 0.2781)[/tex]

Average atomic mass = 56.7221 amu.

Initial pressure of the gas = 65.3 kPa  

Initial volume of the gas = 654 cm³

Initial temperature of the gas = 6⁰C = 273 + 6 = 279 K

Final pressure of the gas = 108.7 kPa

Final temperature of the gas = 4⁰C = 273 + 4 = 277 K

Using the combined gas law for ideal gases:

P₁V₁/T₁ = P₂V₂/T₂  

where P₁, V₁ and T₁ are the pressure, volume and temperature for the initial state and P₂, V₂ and T₂ are the pressure, volume and temperature for the final state.

Plugging the given data into the combined gas law we have,

(65.3 kPa x 654 cm³) / (279 K) = (108.7 kPa x V₂)/(277 K)

V₂ = (65.3 kPa x 654 cm³ x 277 K) / (279 K x 108.7 kPa)

V₂ = 390.1 cm³

The formation of bubbles and a colour change are signs of a chemical change.

One of the substances must have evolved the gas and changed into something else.

One of the substances must have changed into something else with a different colour.

Both above are chemical changes.

Evaporation and dissolving are physical changes, because the substances do not change their chemical structure in the process.