Is an element’s flame color a chemical characteristic? Explain.

a) physical property

b) chemical change

c) chemical change

d) chemical property

e) physical change

f) physical property

g) physical change

h) physical change

a) Ethanol has a density of 0.697 g/mL shows physical property, b) The solution turns blue upon mixing water and food coloring shows chemical change, c) Wood burns in an oven shows chemical change, d) Methyl alcohol is highly flammable shows chemical property, e) Ice melts in a beaker shows physical change, f) Methyl ethanoate smells like apples shows physical property, g) A car crashes into a wall shows physical change and h) Sugar dissolves in water shows physical change.

A physical change is a transition that modifies a substance's physical characteristics without changing its chemical makeup or identity. The substance's molecules don't change during a physical change; only their arrangement or state does. On the other hand, a chemical change entails the creation of new compounds with chemical properties that differ from the original ones. A entirely new substance is produced as a result of a chemical reaction in which the links between atoms or molecules are broken and new bonds are established.

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Answer: 13.4

Explanation: i guessed it and got it correct on ck-12

STP is the standard pressure and temperature condition of the ideal gas. 0.13 moles of dinitrogen monoxide will be present at STP.

An ideal gas equation is a relation between the pressure, volume with moles, gas constant, and the temperature of the ideal gas. The ideal gas equation is given by,

\(\rm PV = nRT\)

Given at STP,

Pressure = 1 atm

Volume = 300 L

Moles = ?

Gas constant =8.3144598 J per mol per Kelvin

Temperature = 273 K

Substituting values in the ideal gas equation we get:

\(\begin{aligned} \rm n &= \rm \dfrac{ PV}{RT}\\\\&= \dfrac{1 \times 300}{273 \times 8.314}\\\\&=0.1321\end{aligned}\)

Therefore, 0.13 moles of dinitrogen monoxide are produced at STP.

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A is false- a solid that forms in a solution is called a precipitate

B is true.

C is false - A solution with any amount of dissolved solute less than the amount required to make a saturated solution is considered to be unsaturated. Whenever a solution contains more solute than it can hold, it is said to be supersaturated.

D is false - a solute can be solid, liquid or gas and it dissolves in a solvent, water is also a solvent.

E is true.

When an U-235 nucleus absorbs an extra neutron, it quickly breaks in two parts. This process is known as the fission .

Each time a U-235 nucleus splits up, it releases the two or three neutrons. Hence,  possibility exists for creating a chain reaction.

In nucleus of each atom of uranium-235 (U-235) are 92 protons and 143 neutrons, for the total of 235. The arrangement of the particles within uranium-235 is somewhat unstable and nucleus can disintegrate if it is being excited by an outside source.

Production of neutrons is the main purpose of the MIT Research Reactor. The center active core contains an enormous number of neutrons that are moving at extremely high speeds in all directions while it is active.

Six boron-stainless steel control blades that are installed vertically next to the fuel components in the MIT reactor's uranium nuclei primarily regulate the pace of fissions. Neutrons can be absorbed by boron without being reemitted.

The amount of neutrons that the control blades absorb from the uranium when they are fully implanted is too great for a chain reaction to continue. The reactor's control blades are lifted very gradually to turn it on. more neutrons are produced as less and fewer of them are absorbed.

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Assuming it is Pb(NO3)2, in this case, in order to name this compound, we need to know what each element are named separately, this is usually 90% of the work when we have to name compounds. Pb is the element Lead, and NO3 is the nitrogen oxoanion Nitrate, now because Pb is a transition metal, it has a few possible oxidation numbers (the charge when it bonds with another element), and because of these multiple possibilities, we need to identify the charge of Pb when we name it, since we have NO3, and nitrate has a charge of -1, and we have 2 Nitrates, the charge of Pb, in order to counterbalance it, is +2, now, naming the compound, we will have:

Lead (II) nitrate

The bond type it will be an Ionic bond, since we have different charges

Answer:

1.) 17.76 moles H₂O

2.) 323.1 g HCN

Explanation:

1.) An equation is balanced when there is an equal amount of each element on both sides of the reaction. The quantities can be modified by adding coefficients in front of the molecules.

The unbalanced equation:

Al₄C₃(s) + H₂O -----> Al(OH)₃(s) + CH₄(g)

Reactants: 4 aluminum, 3 carbon, 2 hydrogen, 1 oxygen

Products: 1 aluminum, 1 carbon, 7 hydrogen, 3 oxygen

The balanced equation:

Al₄C₃(s) + 12 H₂O -----> 4 Al(OH)₃(s) + 3 CH₄(g)

Reactants: 4 aluminum, 3 carbon, 24 hydrogen, 12 oxygen

Products: 4 aluminum, 3 carbon, 24 hydrogen, 12 oxygen

Now that the equation is balanced, you can use the relevant coefficients to construct a mole-to-mole ratio. This will allow you to convert between moles Al₄C₃ to moles H₂O.

 1.48 moles Al₄C₃           12 moles H₂O
----------------------------  x  ------------------------  =  17.76 moles H₂O
                                         1 mole Al₄C₃

2.) To find the mass of HCN, you need to (1) convert grams NH₃ to moles NH₃ (via molar mass), then (2) convert moles NH₃ to moles HCN (via mole-to-mole from equation coefficients), and then (3) convert moles HCN to grams HCN (via molar mass). It is important to arrange the coefficients in a way that allows for the cancellation of units.

Molar Mass (NH₃): 14.009 g/mol + 3(1.008 g/mol)

Molar Mass (NH₃): 17.033 g/mol

Molar Mass (HCN): 1.008 g/mol + 12.011 g/mol + 14.009 g/mol

Molar Mass (HCN): 27.028 g/mol

2 CH₄(g) + 3 O₂(g) + 2 NH₃(g)  ------> 2 HCN(g) + 6 H₂O(g)

203.6 g NH₃            1 mole            2 moles HCN           27.028 g
---------------------  x  ----------------  x  ------------------------  x  -----------------  =
                                17.033 g           2 moles NH₃             1 mole

=  323.1 g HCN

In order to use the energy stored in fat, the body breaks dow triglycerides into fatty acids, which individual cells burn for energy

Answer:

Inflammatory

Explanation:

Answer:

By reacting carbon monoxide and hydrogen the formation of methanol takes place, the reaction is,

CO(g)+2H₂(g)⇔CH₃OH (g)

Based on the given reaction, one mole of methanol is obtained by reacting one mole of carbon monoxide (CO) with the two moles of hydrogen (H₂). It is mentioned in the question that for the reaction 500 mol of carbon monoxide and 750 moles of hydrogen are present.

Therefore for 500 moles of carbon monoxide, there is a requirement of 2 × 500 moles of hydrogen, which is equivalent to 1000 moles of hydrogen (H₂). However, only 750 moles of hydrogen is present. Therefore, the limiting reactant in the given case is H₂. The present moles of H₂ will react with 0.5 × 750 moles of CO = 375 mole of CO

The additional or excess concentration of CO, which is the excess reactant will be, 500-375 = 125 moles.

The Acceleration of a model rocket = 4 m/s²

Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object  

∑F = m. a  

\(\large{\boxed{\bold{a=\frac{\sum F}{m}}}\)

F = force, N  

m = mass = kg  

a = acceleration due to gravity, m / s²  

An upward thrust of 35 N

A model rocket has a mass of 2.5 kg(weight = 25 N)

so resultant force :

\(\tt \sum F=F~upward~thrust-F~weight\\\\\sum F=35-25\\\\\sum F=10~N\)

The acceleration :

\(\tt a=\dfrac{\sum F}{m}\\\\a=\dfrac{10}{2.5}\\\\a=4~m/s^2\)

Answer:

D

Explanation:

heterogeneous

.of or denoting a process involving substances in different phases (solid, liquid, or gaseous).

Answer:

Places that get more solar energy have more heat. Places that get less solar energy have less heat. The air above the areas receiving more heat warms up and rises. Because of this, the air, ocean, and Earth's surface gets heated at the equator more than at the poles.

Explanation:

Answer:

no

Explanation:

The poles receive less energy than the equator, hence the poles being colder than the equator.

Answer

b. Add solute to a saturated solution and heat until all of the solute dissolves. Then, slowly cool to the original temperature.

Explanation

A supersaturated solution contains more dissolved solute than required for preparing a saturated solution and can be prepared by heating a saturated solution, adding more solute, and then cooling it gently. Excess dissolved solute crystallizes by seeding supersaturated solution with a few crystals of the solute.

Therefore, a supersaturated solution is prepared by:

b. Add solute to a saturated solution and heat until all of the solute dissolves. Then, slowly cool to the original temperature.

Answer:

Attached below

Explanation:

Attached below is the required diagrams

From the attached diagram ; Compounds 1 and 2 are achiral ( i.e. stereoisomers aren't possible here )

Compound 3 : ( 1S, 2R ) - 1 - chloro-2-methylcyclopropane

Compound 4: ( 1R , 2S ) - 1- chloro-2-methylcyclopropane

Compound 5: ( 1R, 2R ) - 1 - chloro-2-methylcyclopropane

Compound 6: ( 1S, 2S ) -1- chloro-2- methyl cyclopropane

The number of moles of 210 grams of NaHCO₃ is 2.5 moles.

To calculate the number of moles use the formula

Number of moles = \(\frac{\text{Given Mass}}{\text{Molar Mass}}\)

Mass of NaHCO₃ = 210 g

Now we have to find the Molar mass of NaHCO₃

= Atomic mass of Na + Atomic mass of H + Atomic mass of C + 3 (Atomic mass of O)

= 23 + 1 + 12 + 3 (16)

= 36 + 48

= 84 g/mol

Now put the value in above formula we get

Number of moles = \(\frac{\text{Given Mass}}{\text{Molar Mass}}\)

                             = \(\frac{210\ g}{84\ g/mol}\)

                             = 2.5 moles

Thus from the above conclusion we can say that The number of moles of 210 grams of NaHCO₃ is 2.5 moles.

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Answer:

Zn + 2HCl -> H2 + ZnCl2

CS2 + 2O2 -> CO2 + S2O2

Explanation:

Answer: The burning of fossil fuels releases carbon dioxide, methane and other greenhouse gases into the atmosphere. These gases trap heat in the atmosphere, leading to a gradual increase in global average temperatures, known as global warming. This phenomenon has serious impacts on our environment and ecosystems, including extreme weather events and rising sea levels.

The balanced redox reaction in the chemical reaction is given below:

40H2S + 48H+ + 16MnO4¯ ---> 5S8 + 16Mn2+ + 64H2O

Balancing the redox reaction:

Solution:

1) Half-reactions:

H2S ---> S8

MnO4¯ ---> Mn2+

2) Balance:

8H2S ---> S8 + 16H+ + 16e¯

5e¯ + 8H+ + MnO4¯ ---> Mn2+ + 4H2O

3) Make the number of electrons equal (note that there are no common factors between 5 and 16 except 1):

40H2S ---> 5S8 + 80H+ + 80e¯ <--- factor of 5

80e¯ + 128H+ + 16MnO4¯ ---> 16Mn2+ + 64H2O <---

factor of 16

4) Thus, the final answer is given below;

40H2S + 48H+ + 16MnO4¯ ---> 5S8 + 16Mn2+ + 64H2O

Oxidation-reduction can simply be defined as a special type of chemical reaction in which the oxidation states of the substrate change.

So therefore, the balanced redox reaction in the chemical reaction is given below:

40H2S + 48H+ + 16MnO4¯ ---> 5S8 + 16Mn2+ + 64H2O

Complete question:

Balance the following redox reaction:

MnO4¯ + H2S ---> Mn2+ + S8

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If you traded (converted) 15 Skittles for M&Ms, you will have 20 M&Ms

We'll begin by converting 15 Skittles to cookies. This can be obtained as follow:

6 Skittles = 4 Cookies

Therefore,

15 Skittles = (15 Skittles × 4 cookies) / 6 skittles

15 Skittles = 10 cookies

We can convert 10 cookies to M&Ms as follow:

1 Cookies = 2 M&Ms

Therefore,

10 cookies = (10 cookies × 2 M&Ms) / 1 Cookies

10 cookies = 20 M&Ms

Thus, 15 Skittles is equivalent to 20 M&Ms

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The complete equation will look thus: \(2HNO_3(aq) + Ba(OH)_2(aq) --- > Ba(NO_3)_2 + 2H_2O\)

In order for equations to be balanced, the component atoms in the reactants and products must be the same in terms of number.

Thus, in the given equation, the number of H, N, O, and Ba atoms in the reactants and the products must be equal.

Therefore, the overall equation becomes:

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Answer:2HNO3 + Ba(OH)2 → Ba(NO3)2 + 2H2O

Explanation:

HNO3 + Ba(OH)2 = Ba(NO3)2 + H2O

This is what each element is....

H= 1+2=3                 H=2

N=1                          N=2

O=2+2=4                O=4+1=5

Ba=1                        Ba=1

Now to balance each side.....

H=2+2=4               H=2++2=4

N=2                       N=2

O=4+2=6              O=4+2=6

Ba=1                      Ba=1

The balanced equation is now

2HNO3 + Ba(OH)2 → Ba(NO3)2 + 2H2O

The percent by mass of the lithium in the compound is 18.78%. Option C

We know that the percentage has to do with the amount of the element that can be found in the compound. We can be able to obtain this when we  find the molar mass of the compound and then obtain the mass of the element in the compound.

Hence;

Molar mass of the compound = [2(7) + 12 + 3(16)]

= 14 + 12 + 48

= 74 g/mol

The we have the mass of the lithium in the compound as 14

Thus we then have;

Percent of lithium = 14/74 * 100/1

= 18.78%

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The Pressure of gas in the bulb = 1392.70 atm

1) The barometric pressure is also called atmospheric pressure as it is the pressure with in the earth.

2) The given  values are

The barometric pressure =  766 Torr = 1.00789 atm (convert the value of torr into the standard pressure that is atm)

The height of Barometer (in mercury)= 141 mmHg

Pressure of a gas in bulb = need to find out.

The formulae used is

P=ρ×g×h, where:

P = pressure of gas (unknown )

g = acceleration due to gravity = 9.8m/s²

h = Hight of the liquid

By substituting all the values in above equation,

P = 1.00789×9.8× 141

P = 1392.70 atm

so the The barometer whose barometric pressure is 1392.70 atm  atm exerted by the mercury and the height of the liquid is 141 mmHg.

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Answer: m= n·M = 2.5 mol· 159.7 g/mol

Explanation: molar mass Fe2O3 = 2·55.85+ 3·16 = 159,7 g/mol

These substances have dispersed particles that are large enough to scatter light, making the beam visible. Therefore, out of the options provided, a mixture that scatters light is an example of a colloid. Option B)

A colloid is a type of mixture in which particles are dispersed throughout a medium, creating a homogeneous appearance. Unlike solutions, where the particles are completely dissolved, and suspensions, where the particles settle out, colloids have particles that are larger than those in solutions but smaller than those in suspensions. One characteristic of colloids is that they can scatter light due to the size of the particles. This scattering of light is known as the Tyndall effect. Examples of colloids include milk, fog, and aerosol sprays. These substances have dispersed particles that are large enough to scatter light, making the beam visible. Therefore, out of the options provided, a mixture that scatters light is an example of a colloid. Therefore option B) is correct

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Note Complete Question

which is an example of a colloid?

a mixture that settles out,

b mixture that scatters light,

c mixture that is separated by filtration,  

d salt and water mixture?

By the concept of calculating moles ,it can br concluded that the no. of atoms of phosphorus in 8.80mol of copper(II) phosphate is=1.06\(x10^{25}\)

A mole is defined as amount of substance containing as many as elementary entities that are there in atoms of exactly 12 g of carbon-12.Therefore we can say,1 mole of copper(II) phosphate, Cu3(PO4)2, contains three moles of copper(II) cations and two moles of phosphate anions.

Again 1mole of phosphate anions contains one mole of phosphorus and four moles of oxygen.Considering all these informations we can conclude that:1 mole of copper(II) phosphate contains 2 moles of Phosphorus

Accordingle the sample contains=(8.80\(x\)2) moles of Phosphorus

                                    =(17.6\(x\)Avogadro's constant) atoms of  Phosphorus

                                    =(17.6\(x\)6.022\(x\)\(10^{23}\)) atoms of  Phosphorus

                                    =1.06\(x10^{25}\) [approx] no. of Phosphorus atoms

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In 8.80 moles of copper(II) phosphate, there are approximately 1.06 x 10²⁵ atoms of phosphorus.

The number of atoms of phosphorus in a given amount of a compound can be calculated using the concept of mole in chemistry. Copper(II) phosphate is Cu3(PO4)2, containing 2 moles of phosphorus (P) for every 1 mole of the compound. Avogadro's number (6.022 x 10²³) gives the number of atoms in one mole.

So, if there are 8.80 moles of copper(II) phosphate, there would be 2 × 8.80 moles of phosphorus. Multiplying this by Avogadro's number gives the total number of phosphorus atoms.

Therefore, the number of phosphorus atoms is 2 × 8.80 × 6.022 x 10²³ = 1.06 x 10²⁵ atoms of phosphorus.

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Answer:

0.0152

0.0000000778

Explanation:

You just need to more the decimal as many times as the exponent to the to the left if it is negativa and to the right if it is positive.

Answer:

The mass of 2 moles of water is greater than the mass of 2 moles of carbon dioxide, which is greater than the mass of 2 moles of ozone.

2 moles of water has a mass of approximately 36 grams, whereas 2 moles of carbon dioxide has a mass of approximately 44 grams, and 2 moles of ozone has a mass of approximately 48 grams.

ALLEN

The mass, in grams, of NaCl needed to use to make the solution is 1.76grams.

The mass of a substance can be calculated by multiplying the number of moles by its molar mass.

However, the number of moles must first be calculated by using the following expression:

Molarity = no. of moles ÷ volume

no. of moles = 0.249 × 0.1208

no. of moles = 0.03moles

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

mass of NaCl = 0.03 × 58.5 = 1.76g

Therefore, the mass, in grams, of NaCl needed to use to make the solution is 1.76grams.

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