Deuterium is the isotope of hydrogen of mass number 2, with a proton and a neutron in its nucleus. The chemistry of deuterium is nearly identical to the chemistry of hydrogen, except that C−D bond is slightly (5.0KJ/mole) stonger than the C−H bond. Reaction rates tend to be slower if a C−D bond as opposed to a C−H bond is broken in a rate limiting step. This effect on the rate is called a kinetic isotope effect.

a. True
b. False

Answer:

c

Explanation:

hope I helped

hope im corrext

Ice wedging can be defined as the property of frozen water to take more space than liquid water. Thus, option C is correct.

The ice has been the solid state of water. The liquid molecules bond together for the resulting solid molecule.

Ice wedging can be defined as the mechanical weathering of the rock by the effect of ice. The rocks have consisted of cracks that accumulated water in them.

With the decrease in the temperature, the water has been expanded and has been converted to ice. The expansion of water in the cracks results in the breaking of the rocks.

Thus, ice wedging can be defined as the property of frozen water to take more space than liquid water. Thus, option C is correct.

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Answer:

AgCl(s)

dissolution

⇌

precipitation Ag+(aq)+Cl−(aq)

Explanation:

dynamic; some of the solid AgCl continues to dissolve, but at the same time, Ag+ and Cl– ions in the solution combine to produce an equal amount of the solid. At equilibrium, the opposing processes have equal rates.

Answer:

D

Explanation:

Hydrogen Bond is one of the many different types of bonds there are. It is a primarily electrostatic force of attraction between a hydrogen atom that is covalently bounded to another electronegative atom or group. The group it bonds with mostly are elements of the second-row elements in the periodic table, like nitrogen oxygen or even fluorine. Hydrogen bonds have the capabilities to be either intermolecular or intramolecular. This often depends on the nature and type of thees atoms donating, and even that of the atoms receiving.

Answer:

i think

SrF2 + Br2 --->

dont count me on it

Explanation:

balanced

Answer:

B6Br4

Explanation:

Chemical formula gives a representation of the number of atoms that each element in a compound or molecule. In this question which is asking to give the formula of hexaboron tetrabromide, the hexa means 6 while the tetra means four.

Since the number of atoms of each element is written as a prefix before the main element, this means that the chemical formula of hexaboron tetrabromide will be B6Br4.

Answer:

Polar molecules occur when two atoms do not share electrons equally in a covalent bond. ... If the electronegativity difference between the atoms is greater than 2.0, the bond is ionic. Ionic compounds are extremely polar molecules.

Explanation:

Answer:

Q = m.c. ΔT

Explanation:

When temperature is changed the heat evolved or absorbed are calculating by following formula.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Specific heat capacity:

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

When temperature is decreased heat is evolved and negative sign is added into Q value.

When temperature is increased heat is absorbed by system and positive sign is added with Q value.

Answer:

160 mL

Explanation:

Given data:

Molarity of NaOH = 0.105 M

Volume of H₂SO₄ = 40.0 mL (40.0/1000 = 0.04 L)

Molarity of H₂SO₄ = 0.210 M

Volume of NaOH required = ?

Solution:

Number of moles of of H₂SO₄:

Molarity = number of moles / volume in L

0.210 M = number of moles / 0.04 L

Number of moles = 0.210 mol/L × 0.04 L

Number of moles = 0.0084 mol

now we will compare the moles of H₂SO₄  with NaOH.

                     H₂SO₄          :           NaOH

                        1                 :             2

                    0.0084          :         2/1×0.0084 = 0.0168 mol

Volume of NaoH:

Molarity = number of moles / volume in L

0.105 M =  0.0168 mol / Volume in L

Volume in L =  0.0168 mol / 0.105 M

Volume in L =  0.16 L

Volume in mL:

0.16 L × 1000 mL/ 1L

160 mL

The volume of the NaOH solution required for the reaction is 160 mL

The balanced equation for the reaction is given below:

H₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O

From the balanced equation above,

Finally, we shall determine the volume of the base, NaOH required for the reaction.

MaVa / MbVb = nA/nB

(0.21 × 40) / (0.105 × Vb) = 1 / 2

8.4 / (0.105 × Vb) = 1 / 2

Cross multiply

0.105 × Vb = 8.4 × 2

0.105 × Vb = 16.8

Divide both side by 0.105

Vb = 16.8 / 0.105

Vb = 160 mL

Thus, the volume of the base, NaOH required for the reaction is 160 mL

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Answer:

are you silly your question is opposite silly

Answer:

beacuse this reason has lower atmospheric pressure due to a thinner blanket of air above. ... As atmospheric pressure decreases, liquid boils at lower temperatures. due to which it takes less time than terai region

Answer:

C. Smell it

Explanation:

Yolo it and if im right then i deserve a 5 star :)

Answer:

honestly If I were that person I would go with feeling to figure out the texture because thats the most distinctive thing but I could be wrong. Good Luck.

Explanation:

Answer:

D) Water splashing

Explanation:

Displacement is about moving something from its original place.  In A, B, and C nothing is being moved. This makes D the only answer!

Answer:

Both A and B

Explanation:

A.

the limestone, because the acidic groundwater would dissolve the rock's calcite

B.

the granite, because the acidic groundwater would oxidize the rock's iron

Answer: D

Explanation: Even if the audiance did not have a pair of shoes felt uncomfortable or worried not a lot of people would have noticed. If anyone noticed it would only be about 5% of people so that is how I came to the conclision of D.

Answer:

They have the same number of protons. Scientists are working wit a liquid that is made of only one type of atom.

GOOD LESSONS ♡

Answer:

1)seismic 2) S-waves 3) outer core

Answer:the other comment is right

Explanation:

Answer:

Where is the grahppppp?!!!!

Answer:

7.62

Explanation:

Given that :

pH = 7.8

Conjugate base in solution = 0.6 M

Weak Acid in solution = 0.4 M

Recall :

pH = pKa + log(conjugate base / acid)

Hence,

PKa = pH - log(conjugate base / acid)

pKa = 7.8 - log(0.6 / 0.4)

pKa = 7.8 - log(1.5)

pKa = 7.8 - 0.1760912

pKa = 7.6239088

Hence, pKa = 7.62 (2 decimal places)

number of moles = 1.00 X 10^22 ÷ 6.022 × 10^23

= 0.0166 moles

mass = number of moles × molar mass

= 0.0166 × 120.37 = 2.00 g

Answer:

[tex]0.0335\ \text{g}[/tex]

[tex]2.978\ \text{g}[/tex]

[tex]3586.84\ \text{g}[/tex]

[tex]0.0026\ \text{g}[/tex]

Explanation:

Mass in grams is given by

[tex]m=\dfrac{nM}{N_A}[/tex]

where

n = Number of molecules

[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]

M = Molar mass of molecule

Molar mass of [tex]H_2O_2[/tex] = 34.0147 g/mol

[tex]n=5.94\times 10^{20}[/tex]

[tex]m=\dfrac{5.94\times 10^{20}\times 34.0147}{6.022\times 10^{23}}\\\Rightarrow m=0.0335\ \text{g}[/tex]

Mass of [tex]H_2O_2=0.0335\ \text{g}[/tex]

Molar mass of [tex]SO_2[/tex] = 64.066 g/mol

[tex]n=2.8\times 10^{22}[/tex]

[tex]m=\dfrac{2.8\times 10^{22}\times 64.066}{6.022\times 10^{23}}\\\Rightarrow m=2.978\ \text{g}[/tex]

Mass of [tex]SO_2=2.978\ \text{g}[/tex]

Molar mass of [tex]O_3[/tex] = 48 g/mol

[tex]n=4.5\times 10^{25}[/tex]

[tex]m=\dfrac{4.5\times 10^{25}\times 48}{6.022\times 10^{23}}\\\Rightarrow m=3586.84\ \text{g}[/tex]

Mass of [tex]O_3=3586.84\ \text{g}[/tex]

Molar mass of [tex]CH_4[/tex] = 16.04 g/mol

[tex]n= 9.85\times 10^{19}[/tex]

[tex]m=\dfrac{9.85\times 10^{19}\times 16.04}{6.022\times 10^{23}}\\\Rightarrow m=0.0026\ \text{g}[/tex]

Mass of [tex]CH_4=0.0026\ \text{g}[/tex]

Answer:

Cl

Explanation:

The element Cl will have the strongest ionization energy from the given choices. Most non-metals have higher ionization energy compared to metals.

Ionization energy is the energy required to remove the most loosely held electron from the gaseous phase of an atom.

Answer:

In contact freezing refrigerants are used for immersion freezing foods.

Explanation:

Answer:

2Al(NO_{3} )_{3} + 3K_{2}SO_{4} ----> Al_{2}(SO_{4})_{3} + 6KNO_{3}

Explanation:

[tex]2Al(NO_{3} )_{3} + 3K_{2}SO_{4} ----> Al_{2}(SO_{4})_{3} + 6KNO_{3}[/tex]

Answer: C. Adding concentrated HCL(aq)

Explanation:

HCl is an efficient acid that will increase the quantity of H+ in the solution and thus reduce the ionizing percentage of Ch3CO2H. The amount of ionization of the latter would be reduced by the addition of strong acid to a solution of weak acid.

Answer:

- Both accurate and precise.

Explanation:

The experimental data is characterized as the data that is generated through a specific test or measurement with the purpose of analysis or evaluation. As per the question, the minuteness of the given data(29.27, 29.32, and 29. 27)most aptly describes that the experimental data collected by the student possesses 'accuracy and precision' apt and specific. It would yield the most worthy and reliable conclusion.

Answer:

1. Melting ice does not change the composition of the water or ice, as the ice is only changing its state from solid to liquid. Boiling water also does not change the composition of the water or gas, as the water is only changing its state from liquid to gas.

2. Burning paper turns the paper fibres to ashes. Making yoghurt from milk is making something new out from milk, where there is fermentation going on to turn the lactose into an acid, resulting in a chemical change and not a physical change.

Explanation:

A chemical change is when a new substance is formed from the old thing due to a chemical process such as burning where energy is given off or absorbed, while a physical change is basically changing the state of a substance but its composition does not change, unlike a chemical change.

Answer:

I'm so happy to help you with this question!! The answer is tympanic.

Explanation:

The middle ear is separated from the outer ear by the eardrum, or tympanic  membrane, a thin piece of tissue stretched tight across the ear canal. Sounds hit the eardrum, making it move.

I really hope this helps you!! :)

Answer:

The more fraction NaoH is 39.998g/mol

Answer:

.0735 is correct

Explanation:

Answer:

the answer is B- social contract

Explanation:

the person above me is correct

Answer: [tex]\Delta H_{rxn}=-4652[/tex] kJ/mol

Explanation: In a reaction, a bond of a molecule can break or rearrange itself. When it happens, it absorb or release energy.

Bond Energy is the energy necessary to break or to make a particular bond, producing gaseous fragments at atmospheric temperature. This type of energy can be used to show how stable a compound is or how easy a bond can break.

Enthalpy of Reaction is the energy absorption or release at a constant temperature resulting from a chemical reaction.

To calculate the Enthalpy using bond energy, you have:

1) Write the balanced equation with all the all the reactants and products in gaseous form:

[tex]C_{5}H_{12}_{(g)}+8O_{2}_{(g)}[/tex] ⇒ [tex]5CO_{2}_{(g)}+6H_{2}O_{(g)}[/tex]

2) Count each bond of each molecule from both sides, including double or triple bonding, if they exists:

Reactants:

[tex]C_{5}H_{12}[/tex] : 12 C-H

            4 C-C

O₂ : 1 O=O

Products:

CO₂ : 2 C=O

H₂O : 2 H-O

3) From the balanced reaction, we there are 8 moles of oxygen gas, 5 moles of carbon dioxide and 6 moles of water, which has to be included when adding each side.

[tex]\Sigma H_{reactants}=[/tex] 12.257 + 4.370 + 8.490 = 8484

[tex]\Sigma H_{products}=[/tex] 5.2.740 + 6.2.478 = 13136

4) Calculate Enthalpy of Reaction by:

[tex]\Delta H_{rxn}= \Sigma H_{reactants}-\Sigma H_{products}[/tex]

[tex]\Delta H_{rxn}=8484-13136[/tex]

[tex]\Delta H_{rxn}=-4652[/tex]

The enthalpy of reaction for the combustion of 1 mole of pentane on a just discovered imaginary planet is an exothermic process of magnitude [tex]\Delta H_{rxn}=[/tex] - 4652kJ/mol

Using the planet's given bond energies to calculate the enthalpy of reaction, the combustion of 1 mole of pentane is -4652 kJ.

The balanced chemical reaction for the combustion of pentane is well represented as:

[tex]\mathbf{C_5H_{12}+8O_2 \to 5CO_2+6H_2O}[/tex]

From the above reaction, the bonds broken are 12 Carbon-Hydrogen bonds, 4 Carbon-Carbon bonds, and 8 oxygen-oxygen bonds.

Similarly, the bonds formed are 10 Carbon-Oxygen bonds and 12 Oxygen-hydrogen bonds.

Hence, the energy absorbed when bonds are broken are:

= 12(C-H) + 4(C-C) + 8(O-O)

= 12(257 kJ) + 4(370 kJ) + 8(490 kJ)

= 3084 kJ + 1480 kJ+ 3920 kJ

= 8484 kJ

Also, the energy released as a result of the formation of bond is:

= 10 (C=O) + 12 (O-H)

= 10 (740 kJ) + 12 (478 kJ)

= 7400 kJ + 5736 kJ

= 13136 kJ

From above, we can notice that the energy released during the formation of bonds is greater than the energy absorbed while breaking bonds.

Thus, the enthalpy of the combustion reaction is the difference in energy.

i.e.

The enthalpy of the combustion reaction = 8484 kJ - 13136 kJ

= -4652 kJ

Therefore, we can conclude that the enthalpy of reaction from the combustion of 1 mole of pentane is -4652 kJ. The negative sign indicates that more energy is released compared to the amount of energy absorbed.

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