Steve wants to investigate the expansion and contraction of gases at different temperatures. He knows that at higher temperatures, gas particles move faster. His hypothesis is that at higher temperatures the faster particle motion causes gas to expand. He fills three balloons with the same amount of gas and heats the gas in each balloon to different temperatures. The test (independent) variable is the temperature of the gas. Which statement describes how the outcome (dependent) variable changes as a result of the changes made to the tested (independent) variable?

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:

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:

The more fraction NaoH is 39.998g/mol

Answer:

.0735 is correct

Explanation:

Answer: B. Hydrolysis (adding water)

Explanation:

When peptide bonds join two or more amino acids together, this is refered to as a peptide. A polypeptide simply means several amino acids. We should also note that proteins contains polypeptides.

The reaction that is capable of breaking polypeptides into their component amino acids is hydrolysis. This simply means a chemical process whereby a water molecule is being added to a particular substance.

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:

i think

SrF2 + Br2 --->

dont count me on it

Explanation:

balanced

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:

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)

Answer:

lhigygygigy

Explanation:

hyfgutfytifytftyfjgfhjfv

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:

Option D. 1.67 g

Explanation:

The balanced equation for the reaction is given below:

6Li (s) + N₂ (g) → 2Li₃N (s)

Next, we shall determine the masses of Li and N₂ that reacted and the mass of

Li₃N produced from the balanced equation. This can be obtained as follow:

Molar mass of Li = 7 g/mol

Mass of Li from the balanced equation = 6 × 7 = 42 g

Molar mass of N₂ = 14 × 2 = 28 g/mol

Mass of N₂ from the balanced equation = 1 × 28 = 28 g

Molar mass of Li₃N = (7×3) + 14 = 21 + 14 = 35 g/mol

Mass of Li₃N from the balanced equation = 2 × 35 = 70 g

SUMMARY:

From the balanced equation above,

42 g of Li reacted with 28 g of N₂ to produce 70 g of Li₃N.

Next, we shall determine the limiting reactant. This can be obtained as illustrated below:

From the balanced equation above,

42 g of Li reacted with 28 g of N₂.

Therefore, 1 g of Li will react with =

(1 × 28)/42 = 0.67 g of N₂

From the calculation made above, we can see that only 0.67 g of N₂ out of 1 g given is required to react completely with 1 g of Li.

Therefore, Li is the limiting reactant and N₂ is the excess reactant.

Finally, we shall determine the theoretical yield of Iithium nitride, Li₃N.

The theoretical yield of Iithium nitride, Li₃N, can be obtained by using the limiting reactant as illustrated below:

From the balanced equation above,

42 g of Li reacted to produce 70 g of Li₃N.

Therefore, 1 g of Li will react to produce = (1 × 70)/42 = 1.67 g of Li₃N.

Thus, the theoretical yield of Iithium nitride, Li₃N is 1.67 g.

Answer:

the answer is B- social contract

Explanation:

the person above me is correct

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:

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:

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:

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!

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:

B: causees destrution

Explanation:

its right trust me

Answer:

-Cations: They are formed by an atom losing an electron or electrons.

-Anions: They are formed by an atom gaining an electron or electrons.

Answer:

The word 'pinniped' means 'fin foot', as the four legs of seals, sea-lions and walrus have developed into flippers to better suit their life in the water. They are not fish! Even though a great part of their life is spent in the sea, pinnipeds are warm blooded air-breathing mammals known as marine mammals.

Explanation:

Sea lions (left) are brown, bark loudly, "walk" on land using their large flippers and have visible ear flaps. Seals have small flippers, wriggle on their bellies on land, and lack visible ear flaps. ... Both seals and sea lions, together with the walrus, are pinnipeds, which means "fin footed" in Latin.

To solve this we must be knowing each and every concept related to sea lions. Therefore, due to above given reason,  seals and sea lions are not considered fish.

Sea lions are curious creatures with sleek bodies that are playful as well as acrobatic in behavior. The species that can be found in aquariums and zoos the most frequently are California sea lions, who enthrall visitors with their antics. This captivating animal possesses a variety of extraordinary traits that are just amazing. Learn more about this sea lion by reading on.

Scaled fish have a cold blooded constitution. Their bodies are streamlined, and they breathe underwater. Fur covers seals and sea lions. They are warm blooded and breath air.

Therefore, due to above given reason,  seals and sea lions are not considered fish.

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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:

A

Explanation:

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:

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:

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:

Hg

Explanation:

Hg is a correct chemical symbol of an element. Therefore, The correct option is option C among all the given options.

The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.

A material that cannot be destroyed chemically is referred to as a chemical element. Although chemical processes cannot modify an atom, nuclear reactions can create new elements. Hg is a correct chemical symbol of an element. A material that is not further decomposed either by chemical reaction is known as a chemical element.

Therefore, Hg is a correct chemical symbol of an element. The correct option is option C among all the given options.

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Answer:

6.25%

Explanation:

Given data:

Total sample = 150 g

Percentage remain after 4 half life = ?

Solution:

at time zero 150 g

At first half life = 150 g/2 = 75 g

At 2nd half life = 75 g/ 2 = 37.5 g

At 3rd half life = 37.5 g/2 = 18.75 g

At 3rd half life = 18.75 g/2 = 9.375 g

Percentage remain after 4 half lives.

9.375 g / 150 g × 100

0.0625 × 100

6.25%

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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Answer:

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

Answer:the other comment is right

Explanation: