the weak ionization constant (Ka) for HNO2 is equal to:

Answer:

It's the button with the x, and a blank box above it.

Explanation:

Check the attachments, you'll see what it looks like. It will probably look different on your calculator, but the icon should be the same or similar.

Answer:

liquids have more kinetic energy than solids

Explanation:

water and ice are good examples

hotter the faster

kinetic can mean speed

solids held together by strong intermolecular forces of attraction

very little or no kinetic energy between the particles

solids are rigid and have definite shape and volume

liquid particles are held by weaker Vander Waal forces.

particles collide with each other and gain kinetic energy.

liquids have more kinetic energy than in the solid phase.

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The long form of periodic table consist of vertical columns called groups and horizontal rows called periods.

Elements are arranged in the increasing order of atomic numbers.

Elements in the modern periodic table are arranged in 7 periods and 18 groups.

Horizontal rows are called periods and vertical columns are called groups.

Elements are placed in periods based on the number of shells in their atoms.

The shortest period is the first period which contains only two elements – Hydrogen and Helium.

Sixth period is considered as the longest periods in the periodic table. It contains elements from Cesium to Radon.

Seventh period is incomplete period.

In periodic table Lanthanides and Actinides are shown in the bottom of the periodic table

Taking into account the definition of calorimetry, sensible heat and latent heat, the heat needed to melt 10.0 grams of ice at -10°C until it is water at 10°C is 3,969.5 J.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

In this case, the amount of heat a body receives or transmits is determined by:

Q = c× m× ΔT

where:

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

In this case, the heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

First, you  have to get the ice from -10°C to 0 °C, which is the melting point.  Then you have to melt the ice into liquid water. Now, you have to get the water from 0°C to 10°C.

In this case, you know:

Replacing in the definition of sensible heat:

Q1= 2.108 [tex]\frac{J}{gK}[/tex]× 10 g× 10 K

Solving:

Q1= 210.8 J

In this case, you have to melt the ice into liquid water. Being the specific heat of melting of ice is 334 J/g, the heat needed to melt 10 grams of ice is calculated as:

Q2= 10 grams× 334 J/g

Solving:

Q2= 3,340 J

In this case, you know:

Replacing in the definition of sensible heat:

Q3= 4.187 [tex]\frac{J}{gK}[/tex]× 10 g× 10 K

Solving:

Q3= 418.7J

The total heat required is calculated as:  

Total heat required= Q1 + Q2 + Q3

Total heat required= 210.8 J + 3,340 J + 418.7 J

Total heat required= 3,969.5 J

In summary, the heat needed to melt 10.0 grams of ice at -10°C until it is water at 10°C is 3,969.5 J.

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Answer: D. They are slippery.

Explanation:

         Only one of the following is a property of bases. This is option D, they are slippery. Bases usually feel slippery, which can also be described as "soapy." Many soaps, shampoos, detergents, etc contain bases.

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(a) The edge length of the unit cell is 286 pm.

(b) The  the density of aluminum metal is 1.27 x 10⁻²³ g/cm³.

The edge length of the aluminum atom is calculated as follows;

a = 2r

where;

a = 2 x 143 pm = 286 pm

V = a³

V = (286 x 10⁻¹²)³

V = 2.34 x 10⁻²⁹ m³

ρ = ZM/VN

where;

ρ = (4 x 4.479 x 10⁻²³) / ( 2.34 x 10⁻²⁹ x 6.023 x 10²³)

ρ = 1.27 x 10⁻¹⁷ g/m³

ρ = 1.27 x 10⁻¹⁷ g/m³  x (1 m³ / 10⁶ cm³)

ρ = 1.27 x 10⁻²³ g/cm³

Thus, the edge length of the unit cell is 286 pm and the  the density of aluminum metal is 1.27 x 10⁻²³ g/cm³.

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Answer:

D

Explanation:

Ideal gas law    PV = n RT     R = .082057      T   must be in Kelvin  

                                               n = moles

V = n RT / P

  = 1.5 (.082057) ( 27+ 273.15) / 2 = 18.5 liters

This exercise is related to the subject of Structured Thinking. See the definition of structured thinking below.

The process of developing a structured framework to address an unstructured situation is known as structured thinking.

Structured thinking is a strategy of problem-solving that entails breaking a huge problem into smaller ones in order to tackle the larger problem more quickly and effectively.

Categorizing things and identifying themes are two subjects under structured thinking.

To categorize anything requires:

Identifying themes entails:

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The oxidation number of chlorine in KClO3 is +5 (option A).

The oxidation number of an element is the hypothetical charge of an atom within a molecule.

The oxidation number of an element like chlorine in a compound like Pottasium chlorate can be calculated as follows:

The oxidation number of the elements in KClO3 is as follows:

1 + x - 2(3) = 0

x - 5 = 0

x = +5

Therefore, the oxidation number of chlorine in KClO3 is +5.

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S denotes the ''number of shared electron pairs by an atom'', Hence, Silicon transmits its 4 electrons with 4 Cl-atoms. Thus the Value of S is 4 in SiCl₄ .It is also known as covalency

Silicon Tetrachloride is a transparent, colorless, fuming liquid with an irritating odor. It is used to create Silicon-containing chemicals and in chemical analysis. determine potentially hazardous frontages.

Silicon tetrachloride is designed by the chlorination of various silicon compounds such as ferrosilicon, silicon carbide, or mixtures of silicon dioxide and carbon. The ferrosilicon route is most familiar. In the laboratory, SiCl 4 can be prepared by dining silicon with chlorine on 600 °C (1,112 °F): Si + 2 Cl 2 → SiCl.

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The oxidation number of reactant Fe is 0 while the  oxidation number of iron in the product is +3

The term redox reaction implies a reaction in which there is an increase in the oxidation number of a specie and the decrease in the oxidation number of another specie.

Now we have the answers as follows;

1) The oxidation number of reactant Fe is 0

2) The oxidation number of reactant oxygen is 0

3) The oxidation number of iron in the product is +3

4) The oxidation number of oxygen in the product is -2

5). Iron is oxidized in the reaction

6) Oxygen is reduced in the reaction

7) The oxidizing agent in this case is the oxygen atom

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Answer:

61 atm

Explanation:

You can calculate osmotic pressure using the following equation:

π = i MRT

In this equation,

-----> π = osmotic pressure (atm)

-----> i = van't Hoff's factor

-----> M = molarity (M)

-----> R = Ideal Gas Constant (0.08206 atm*L/mol*K)

-----> T = temperature (K)

The van't Hoff's factor is the amount of ions the substance dissociates into. Since sugar does not dissociate, this value is 1. After converting Celsius to Kelvin, you can plug the values into the equation and simplify.

i = 1                                 R = 0.08206 atm*L/mol*K

M = 2.5 M                      T = 25 °C + 273.15 = 298.15 K

π = i MRT

π = (1)(2.5 M)(0.08206 atm*L/mol*K)(298.15 K)

π = 61 atm

Answer:

The answer would be D.

Explanation:

Whenever one has many of the same correlating numbers within in a pattern, the rest tend to follow. With the information I was given and not the actual plotting, that would be my answer.

∆H for given reaction -847kJ

So

2 mol of Al releases 847KJ heat

4 mol Al releases

∆H=-1694KJ

It is given that the energy released during the reaction of 2 moles of Al metal is - 847 KJ. The n the heat energy released by 4 moles of Al will be - 1694 KJ.

The enthalpy change of a reaction is the heat energy absorbed or released by a reaction. For an endothermic reaction, the heat energy is absorbed and the enthalpy change is positive. For an exothermic reaction, where the energy is released, the enthalpy change will be negative.

The heat energy change during a reaction is equal to the product of mass, specific heat and temperature difference of the substanc eunder reaction or phase transition.

Given that, the heat evolved by 2 moles of Al is - 847 kJ. Then, the heat evolved when 4 moles of Al reacted is calculated as follows:

(4 × - 847) / 2 = - 1694 KJ.

Therefore, the heat energy released is  - 1694 KJ.

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Answer:

B

Explanation:

Planting trees sequesters CO2

  all of the other choices produce more CO2 in the atmosphere

Answer:

Covalent bonds are intramolecular bonds whereas hydrogen bonds are intermolecular bonds.

hope this helps and good luck :)

Answer:

SO2(g) + O2(g) SO3(g) (needs to be balanced. Balance it by placing a 1/2 in front of the 02.) This is a 5-sig-fig problem, so when you calculate your molar masses, you must use all of the sig figs available to you from the periodic table. That's how you can get this problem correct. Melissa Maribel likes to round the numbers from the periodic table, and usually that is ok. But for problems where you have many sig figs, your molar masses from the periodic table must have at least as many sig figs as your data. Therefore, for each oxygen atom, please use 15.9994 g/mol. For each sulfur atom, please use 32.066 g/mol. Thank you.

Answer:

7.1029 gms of O2

Explanation:

First balance the equation to get

2 SO2  + O2 ====>  2 SO3

Mole weight of sulfur dioxide gas

 S   +   2 O  ==   32.066 + 2 * 15.999   = 64.064 gm/mole  ( 5 signif digits)

     28.442 gm / 64.064 gm/mole = .44396 mole  of SO2 ( 5 sig digits)

From the balanced equation, you can see you need 1/2 as many moles of O2   as  SO2:

mole weight of O2  =   2 * 15.999 = 31.998 gm / mole   ( 5 sig digits)

   now you need    1/2  of  .44396 moles of this

              1/2  * .44396  * 31.998 = 7.1029  gm    ( 5 sig digits)

Answer:

d

Explanation:

d

Answer:

The balanced equation is 5Fe2++MnO-4+8H+→5Fe3++Mn2++4H2O .

Explanation:

˙˚ʚ(´◡`)ɞ˚˙

Answer:

5Fe2++MnO-4+8H+→5Fe3++Mn2++4H2O .

Explanation:

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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Answer: 1

Explanation: Lithium has a single electron in the second principal energy level, and so we say that lithium has one valence electron.

1 is correct

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Answer:

All of the above statements are correct.

Explanation:

acid is a substance that acts as a proton donor, so will have more H+ ions;

basic/alkaline substances act as a proton acceptor, so will have more OH- ions according to bronsted lowry theory

and no to mention neutral means balanced so will have balanced concentration of ions to cancel their charges out.

Answer:

C6H6O2

Explanation:

Total mass of empirical =55

Total mass of compound is 110. So you need to multiply each atims by 2

Answer:

emiprical formula is 55

Explanation:

(-^〇^-)

The change to the experimental design that would improve the reliability of the engineers' measurements is C. testing single samples from more than three locations

It should be noted that experimental design is the process of carrying out research in an objective as well as a controlled fashion in order for precision to be maximized and specific conclusions can be drawn from the hypothesis statement.

Based on the information, the locations selected are only three. Also, an area must have more types of soil with variable porosity. Hence, the collection of more soil samples may provide more accurate results than collecting soil samples from only three regions.

Therefore, change to the experimental design that would improve the reliability of the engineers' measurements is the testing single samples from more than three locations.

In conclusion, the correct option is C.

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Complete question:

Which change to the experimental design would improve the reliability of the engineers' measurements?

A. using a liquid other than water to determine porosity

B. using flasks instead of beakers

C. testing single samples from more than three locations

D. testing more samples from each location

Answer:

Hexane is a 6-carbon hydrocarbon.

Cyclopentyl is a 5-carbon, hydrocarbon ring.

The 1- indicates that the cyclopentyl is attached to the first carbon in hexane.

Two ways of drawing the structure of 1-cyclopentylhexane are below:

Answer:

0.084 moles of H₂O

Explanation:

RAM of Mg = 24, of H = 1, of O = 16

Mg(OH)₂ + 2HCI --> MgCl2 + 2H₂O

Mole of Mg(OH)₂ = mass/MolarMass

= 1/24 = 0.042mol

From the equation,

1 mole of Mg(OH)₂ = 2 moles of H₂O

0.042mol of Mg(OH)₂ = 2 × 0.042 of H₂O

= 0.084 moles of H₂O

Taking into account the definition of pH and pOH, [H₃O⁺] will be 1×10⁻³ M.

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:

pH= - log [H⁺]= - log [H₃O⁺]

Similarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:

pOH= - log [OH⁻]

The following relationship can be established between pH and pOH:

pOH + pH= 14

In this case, you know that [OH⁻]= 1×10⁻¹¹ M.

Replacing in the definition of pOH, it is calculated as:

pOH= - log (1×10⁻¹¹ M)

Solving;

pOH= 11

Replacing in the relationship established between pH and pOH, the pH can be calculated as:

pH + 11= 14

Solving:

pH= 14 - 11

pOH= 3

Replacing in the definition of pH the concentration of H₃O⁺ ions is obtained:

- log [H₃O⁺]= 3

Solving:

[H₃O⁺]= 10⁻³

[H₃O⁺]= 1×10⁻³ M

In summary, [H₃O⁺] will be 1×10⁻³ M.

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