help me with questions 6,11,15,16 and 17 please

ayúdame con las preguntas 6,11,15,16 y 17 por favor

Answer:

a

Explanation:

Answer:

34^8

Explanation:

Answer:

Explanation:Marketable and technically recoverable resources

Canada's natural gas reserves are estimated to be 1,383 trillion cubic feet, of which 542 trillion cubic feet is conventional gas, and the rest is unconventional including coal-bed methane, shale and tight gas.

Answer:

fishery

An area with a large population of valuable ocean organisms is called a fishery. If it was correct mark me as brainiest

Answer:

Ne 20: 10

and

Ne 22: 12

Explanation:

Ne-20:

N = A - Z = 20 - 10 = 10 neutrons

Ne-22:

N = A - Z = 22 - 10 = 12 neutrons

N: number of neutrons

A: mass number

Z: atomic number

Answer:

C Endothermic

Explanation:

a. p. e. x

Answer:

I think it is enzymes

Explanation:

Answer:

YES THE BULB WILL GLOW.

Explanation:

BECAUSE THE CIRCUIT UPPER AREA IS MADE OF PLASTIC SO THE PLASTIC CONDUCTS THE ELECTRICITY SO THE BULB WILL GLOW.

Answer:

Pentane » Hexane » Hexanol

Explanation:

Pentane and Hexane are simple molecular structured with discrete molecules having weak vanderwaals forces of attraction. But Hexane has high molecular mass than pentane hence pentane has lower boiling point than Hexane.

Hexanol has hydrogen bonds between highly electronegative oxygen atom and the hydrogen atom which break on high heat energy application hence it has high boiling point.

Answer:

heat is released

Explanation:

there is a release of energy to the surroundings resulting in a net decrease

Heat is released during an exothermic chemical change. Hence, option D is correct.

The process in which energy is released where bonds are broken is an exothermic reaction.

For example, combustion is an exothermic reaction where initially energy input along with oxygen and wax react to give heat, carbon dioxide and water.

An exothermic reaction is a "reaction in which standard enthalpy change ΔH⚬ is negative." Exothermic reactions release heat and entail the replacement of weak bonds with a stronger bonds.

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The presence of a non-volatile salt will decrease the freezing point of water and this process is called depression in freezing point. Thus option D is correct.

Freezing point of a substance is the temperature at which it converts from its liquid state to solid state where, both the states are in equilibrium. Freezing point of water is zero degree celsius.

The freezing point of a solvent depends on some parameters such as the bond type, molecular weight, temperature, pressure etc.

When a non-volatile solute is added to the solvent its freezing point decreases from its initial value. Because presence of non-volatile salts will affect the intermolecular attraction and thereby the energy that must be applied to freeze the compound.

Therefore, the freezing point of water decreases, when sodium chloride is added into it. Thus option D is correct.

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Answer:

B

Explanation:

took the test

D. It should have a half-life much longer than the age of the object being dated. When using isotopes for dating purposes, it is important to choose an isotope with a half-life that is significantly longer than the age of the object being dated.

The half-life is the time it takes for half of the radioactive isotopes in a sample to decay into stable isotopes. By measuring the ratio of the original radioactive isotope to the decay product, scientists can determine the age of the object.

The majority of the radioactive material would have decayed if the isotope had a half-life substantially less than the age of the artefact, making it challenging to precisely establish the age.

On the other hand, the dating procedure would become more challenging and unpredictable if the isotope in the object being dated (option C) has a half-life that varies over time.

As a result, an isotope with a long half-life offers a stronger basis for precise dating since it enables sufficient radioactive decay to take place, producing quantifiable and trustworthy data.

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Answer:

Slime mold or slime mould is an informal name given to several kinds of unrelated eukaryotic organisms that can live freely as single cells, but can aggregate together to form multicellular reproductive structures. Slime molds were formerly classified as fungi but are no longer considered part of that kingdom.

Answer:

Molds to put slime in

Explanation:

Answer:

Explanation:

9.708 mg of CO₂ will contain 12 x 9.708 / 44 = 2.64 g of C .

3.969 mg of H₂O will contain 2 x 3.969 / 18 = .441 g of H .

mg of O in given liquid B = 3.795 - ( 2.64 + .441 ) = .714 mg

ratio of mg of C , H , O in the compound = 2.64 : .441 : .714

ratio of no of atoms  of C , H , O in the compound

= 2.64 / 12 : .441 /1 : .714 / 16

= .22 : .44 : .0446

= .22 / .22 : .44 / .22 : .044 / .22

= 1 : 2 : .2

1 x 5 : 2 x 5 : .2 x 5

= 5 : 10 : 1

empirical formula of the compound = C₅H₁₀O

Volume of 89.8 mL at 1 .00 atm at 200⁰C

volume of gas at 1 atm and 0⁰C = 89.8 x 273 / 473 mL

= 51.83 mL

51.83 mL weighs .205 g

22400 mL will weigh .205 x 22400 / 51.83 g

= 88.6 g

So molecular weight = 88.6

Let molecular formula be (C₅H₁₀O)ₙ

molecular weight = n ( 5 x 12 + 10 + 16 )

= 86 n

86 n = 88.6

n = 1 approx

So molecular formula is same as empirical formula

C₅H₁₀O is molecular formula .

Answer: There are [tex]4.13 \times 10^{-3}[/tex] moles of Pb are contained in [tex]2.49 \times 10^{25}[/tex] atoms Pb.

Explanation:

According to the mole concept, 1 mole of every substance contains [tex]6.023 \times 10^{23}[/tex] atoms.

Hence, number of moles present in [tex]2.49 \times 10^{25}[/tex] atoms of Pb are as follows.

[tex]No. of moles = \frac{2.49 \times 10^{25}}{6.023 \times 10^{23}}\\= 4.13 \times 10^{-3} mol[/tex]

Thus, we can conclude that there are [tex]4.13 \times 10^{-3}[/tex] moles of Pb are contained in [tex]2.49 \times 10^{25}[/tex] atoms Pb.

Answer:

Sea water salinity is expressed as a ratio of salt (in grams) to liter of water. In sea water there is typically close to 35 grams of dissolved salts in each liter. It is written as 35‰. The normal range of ocean salinity ranges between 33-37 grams per liter (33‰ - 37‰).

Answer:

1.00 × 10³ g

Explanation:

Step 1: Given data

Step 2: Calculate the moles of ethanol vaporized

Vaporization is the passage of a substance from liquid to gas. We can calculate the number of moles (n) vaporized using the following expression.

Q = ΔH°vap × n

n = Q / ΔH°vap

n = 843.2 kJ / (38.6 kJ/mol) = 21.8 mol

Step 3: Calculate the mass corresponding to 21.8 moles of ethanol

The molar mass of ethanol is 46.07 g/mol.

21.8 mol × 46.07 g/mol = 1.00 × 10³ g

The conversion of the liquid into water vapor is called vaporization.

The correct answer to the question is [tex]1.00 * 10^3 g[/tex]

The data given in the question is as follows:-

The formula we will use to calculate the moles is as:-

[tex]Q = H^ovap* n\\n = \frac{Q}{H^ovap}\\n = \frac{843.2 kJ}{(38.6 kJ/mol)} \\\\= 21.8 mol[/tex]

To calculate the mass of the following is as follows:-

[tex]21.8 mol* 46.07 g/mol = 1.00 * 10^3 g[/tex]

Hence the correct answer is [tex]1.00 * 10^3 g[/tex].

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Answer:

a nonradiative transition between states with different spin.

Explanation:

In science, matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter. Matter are known to be made up of atoms and as a result has the property of existing in states.

Generally, matter exists in three (3) distinct or classical phases and these are; solid, liquid and gas.

An atom can be defined as the smallest unit comprising of matter that forms all chemical elements. Thus, atoms are basically the building blocks of matters and as such defines the structure of a chemical element.

Generally, these atoms are typically made up of three distinct particles and these are protons, neutrons and electrons.

Hence, the internal arrangement of atoms in a mineral determines all of the physical properties of the mineral.

Intersystem crossing is a nonradiative transition between states with different spin. For example, a singly excited electronic state may transit into a triple excited state or a triple excited state to a single state, non radioactively.

Answer:

A. As pressure decreases, the concentration of gas molecules in the solution increases.

D. The solubility of nitrogen gas at 2.00 atm is twice the solubility of the gas at 1.00 atm.

F. More gas molecules are soluble as pressure is increased.

The solubility is 188.3 mg of N2 gas/100 g water.

Explanation:

As the pressure on the gas decreases, the volume of gas molecules in the solution increases due to having distance from each other. The solubility of nitrogen gas at 2.00 atm is twice the solubility of the gas at 1.00 atm because there is more pressure on the gas molecules so due to more compression, the gas becomes more soluble. More gas molecules are soluble as pressure is increased. The solubility is 188.3 mg of N2 gas/100 g water if the atmospheric pressure is increases from 3.08 atm to 8.00 atm. This value is calculated with the help of formula i.e. P2/P1 = S2/S1.

Answer:

False

Explanation:

Hope this helps!

Answer:

True

Explanation:

It's because both compounds and elements are considered pure substances and a molecules is considered an element.

Answer:

Animals are used in scientific research to help us understand our own bodies and how they work. This is necessary to develop new medicines. Animals are also used to safety test potential medicines before they are tested in people and to check the safety of other chemicals.

Explanation:

Answer:

Co(s)  ------> Co^3+(aq)  + 3e  

Explanation:

A voltaic cell produces energy by spontaneous chemical processes. A voltaic cell contains an anode and a cathode. Oxidation (electron loss) occurs at the anode while reduction (electron gain) occurs at the cathode.

For the cobalt-silver voltaic cell, the reaction equation of the cobalt and silver voltaic anode half cell is shown;

At the anode;

Co(s)  ------> Co^3+(aq)  + 3e  

Note that the anode is the electrode where oxidation occurs hence electrons are lost at the anode.

To Find :

Number of moles of C₃H₆O present in a sample weighing 25.6 grams.

Solution :

Molecular mass of C₃H₆O is :

M = (6×12) + (6×1) + (16×1) grams

M = 94 grams/mol

We know, number of moles of 25.6 grams of C₃H₆O is :

[tex]n = \dfrac{Given \ Mass \ Of \ C_3H_6O }{Molar\ Mass \ Of \ C_3H_6O }\\\\n = \dfrac{25.6}{94}\ mole\\\\n = 0.27 \ mole[/tex]

Hence, this is the required solution.

Molar concentration is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.

Answer: hydrogen gas

Explanation: When magnesium interacts with water, it will form a hydrogen gas that ignites violently due to the excessive heat and oxygen supply.

Well arranged question is;

Select the statement that is FALSE about this experiment. Group of answer choices;

A) Changing metal solution will affect the redox potential.

B) To ensure consistent data, collect the redox potential values at least three times.

C) Changing temperature will affect the redox potential.

D) To ensure stable reading, insert the conductivity meter in the solution for at least 60 seconds.

E) Changing concentration will affect the redox potential.

Answer:

D) To ensure stable reading, insert the conductivity meter in the solution for at least 60 seconds.

Explanation:

Usually, redox potential is the measure of the ability of chemical elements to gain/lose electrons from/to an electrode respectively and after which they undergo reduction or oxidation respectively.

From online sources on experiments to determine redox potential, and taking into account the nernst equation which is; E_cell = E_0 – (RT/nF)•ln Q

Where;

E_cell is cell potential

E_0 is potential of the cell under standard conditions

R is universal gas constant

T is temperature

n is the number of electrons that are transferred in the redox reaction

F is Faraday's constant

Q is reaction quotient

Now, with all that in mind and looking at the options, the one that is false is option D.

Answer:

Label each solution as acidic, basic, or neutral based only on the stated pH.

milk of magnesia, pH = 10.5

pure water, pH = 7

wine, pH = 3.0

Solution

With a pH greater than 7, milk of magnesia is basic. (Milk of magnesia is largely Mg(OH)2.)

Pure water, with a pH of 7, is neutral.

With a pH of less than 7, wine is acidic.

Answer:

A common method is to perform an acid-base reaction, which can ... acid is not particularly water-soluble due to its nonpolar aromatic ring, ... An acid-base extraction can be used to extract carboxylic acids from ... carbonic acid (H2CO3) can decompose to water and carbon dioxide gas.

Explanation:

The bases that will work to deprotonate the compounds are :

The Benzene ring with carboxylic acid which is a weak acid can be deprotonated using NaOH or NaHCO₃ because of the weakness of the carboxylic acid.

Metal alkoxides like potassium tertiary butoxide can be used to deprotonate a Benzene ring with three carbon chain attached to a single carbon, and also containing a hydroxyl group  is a very weak acid hence the use of Metal alkoxides.

Benzene ring with a hydroxyl group attached  is also a weak acid just like the Benzene ring with carboxylic group hence it can also be deprotonated using NaOH

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