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Answer:

many atoms are in 6.5 moles of zinc? 6.5 moles. 6.02 x 10. 23 atoms =.

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Explanation:

The number of atoms in the 6.5 moles of zinc is equal to 39.15 × 10²³ atoms of zinc.

A mole is a scientific unit that is used to measure a large number of quantities of molecules, ions, atoms, or other particular particles. The number of particles or atoms in a mole is the same for almost all substances.

The number of entities present in one mole was experimentally found to be equal to 6.023 × 10 ²³, which is a constant. This number is termed as Avogadro’s number or Avogadro’s constant.

Given, the number of moles of zinc = 6.5 moles

The number of atoms of zinc in one mole = 6.023 × 10 ²³

Then 6.5 moles of zinc will have atoms of zinc = 6.023 × 10 ²³ × 6.5

                                                                             =  39.15 × 10 ²³ atoms.

Therefore, the 39.15 × 10 ²³ Zinc atoms are in 6.5 moles of zinc.

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Europeans wanted to trade things for rubber and oil with Africa

The name of the compound by using the IUPAC nomenclature of organic compounds is 1 -octene. The correct option is the last option - 1-octene.

From the question, we are to determine the name of the given molecule.

To name the compound, we will follow the IUPAC rules.

Some of IUPAC rules are

The given compound has 8 carbons and a double bond. The root name of the compound is octane.

By IUPAC rules, the compound is an Octene.

Since the double bond is between carbon-1 and carbon-2. The compound becomes 1-octene.

Hence, the name of the compound by using the IUPAC nomenclature of organic compounds is 1 -octene. The correct option is the last option - 1-octene.

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The diagram for the compound is attached below.

The both sturctures of the nucleic acid are called resonance structures.

Resonance structures refers to those structures that differ from each other by the position of electron pairs. We must state that resonsnce occurs in spsecies that have conjugated double bonds.

Hence, the both sturctures of the nucleic acid are called resonance structures.

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Answer:

If you ask for water and water immediately appears that very second, this is an example of something instantaneous.

Answer:

an acid is a proton (H⁺) donor, and a base is a proton acceptor.

Explanation:

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Answer: 4

Explanation:

The equations obey the law of conservation of mass in that the number of moles of each component atom is balanced on both sides.

It states that mass is conserved during chemical reactions.

For the first equation: [tex]N_2(g) + 3H_2(g) --- > 2NH_3(g)[/tex], there are 2 nitrogen and 6 hydrogen atoms on the reactant and product's side respectively. Thus, the number of atoms is conserved.

For the second equation: [tex]HCI(aq) + KOH(aq) -- > KCI(aq) + H_2O (l)[/tex], there are an equal number of H, Cl, K, and O atoms at the reactant and product's sides. The number of atoms is also conserved.

Lastly in the equation: [tex]2Mg(s) + O_2(g) - 2MgO(s)[/tex], the number of each atom is also balanced on both sides.

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Answer:

HCl → H+ + Cl-

pH = -log[H+] = 1.469

Explanation:

Strong acid doesn't establish equilibrium. To determine the pH of a strong acid, the concentration of the acid is equal to the concentration of the hydrogen ion, so take the -log[H+], which will give you the pH. And you can see that it is a small number, and that's because HCl is a strong acid.

The pH of a solution can be calculated using the equation: pH = -log[H+]

pH is a measure of the acidity or alkalinity of a solution. It is a scale that ranges from 0 to 14, with 7 being considered neutral. A pH value below 7 indicates acidity, while a pH value above 7 indicates alkalinity.

In this case, the HCl solution has a concentration of 0.0340 M, which represents the concentration of H+ ions. Since HCl is a strong acid, it completely dissociates in water, yielding one H+ ion for every HCl molecule.

Therefore, the concentration of H+ ions is equal to the concentration of the HCl solution, which is 0.0340 M.

Taking the negative logarithm of 0.0340, we have:

pH = -log(0.0340)

Using a calculator, we find that the pH of the 0.0340 M HCl solution is approximately 1.47.

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Let's see

[tex]\\ \rm\Rrightarrow pOH=-log[OH-][/tex]

[tex]\\ \rm\Rrightarrow pOH=-logx[/tex]

[tex]\\ \rm\Rrightarrow 4.86=-logx[/tex]

[tex]\\ \rm\Rrightarrow logx=-4.86[/tex]

[tex]\\ \rm\Rrightarrow x=10^{-4.86}[/tex]

[tex]\\ \rm\Rrightarrow x=1.38M[/tex]

Answer:

see below

Explanation:

400 gm = 1000 gm (1/2)^n

.4 = (1/2)^n

n = 1.322  half lives = 7574.6 yrs

According to half life, 7574.6 years  would it take a 1000 gram sample to decay to only 400 grams.

Half -life of a substance is defined as the time which is required for half of the quantity of a radioactive substance to get decayed.It is a term which is used in nuclear chemistry for describing how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the time which is required for number of disintegrations per second of radioactive material to decrease by one half of its initial value.

400 gm = 1000 gm (1/2)[tex]^n[/tex]

.4 = (1/2)[tex]^n[/tex]

n = 1.322  half lives = 7574.6 yrs.

Thus, 7574.6 years  would it take a 1000 gram sample to decay to only 400 grams.

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For a current of 15.0 A is passed through molten magnesium chloride for 15.0 hours, the amount of moles of magnesium metal   is mathematically given as

M=4.2mole

Generally, the equation for the Chemical reaction  is mathematically given as

Mg+2e---->Mg

Therefore

Charge=Currect*time

Q=15*5*4.0*10^4

Q=8.10*10^5C

In conclusion, the number of moles

8.10*10^5C*1M/(2*96500)

M=4.2mole

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For a radioactive isotope has an activity of 9.60 mCi.  , the half-life of the isotope is mathematically given as

t0.5 = 23893 s

Generally, the equation for the half-life  is mathematically given as

t0.5=T*0.693

Where

A = A0 e^(-t/T)

t/T = lnA0/A

3.75 hours/T=ln 9.60/7.39

T = 34478.5 s

Therefore

t1/2 = TX0.693

t0.5 = 23893 s

In conclusion, the half life

t0.5 = 23893 s

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Answer:

1.By reduction of acidified anions.

2.By weathering of rocks.

Explanation:

Answer:

2 or can be by reduction of acid anions

Human activities such as fracking might lead to problems such as sinkholes

Sinkholes are openings that form on the surface ofb the earth when water washes away the surface rock or soil layer exposing caverns that have formed within the earth.

Fracking involves using superheated water underground in order to drill natural gas and petroleum from underground.

Human activities such as fracking has been proven to increase the incidence of sinkholes.

Therefore, it can be concluded that fracking might lead to problems such as sinkholes.

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Answer:

1. D. fracking

2. A. algae

3. B. Pollution from the mines makes its way into water sources for Native American tribes and other people in the state.

4. C. during the Industrial Revolution

5. C. pollution of waters from open-pit mining

Unit 8 Lesson 8: Impact of Chemical Processes Quick Check

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Answer:

B. Atmospheric Pressure and Visibility

Explanation:

Latitude and Longitude are locations, not aspects of weather.

While dew point is an element, ground temperature is not measured.

Condensation regarding clouds might be measured but saturation more or less isn't. (Unless specifically humidity.

Atmospheric Pressure and Visibility are both elements of weather.

As the volume was decreased and pressure increased to the given values, the new temperature of the ideal gas is 226.9°C.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

To calculate the new temperature the gas, we subtsitute our given values into the expression above.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

T₂ = P₂V₂T₁/P₁V₁

T₂ = ( 4.00atm × 1.50L × 305.15K ) / ( 1.04605atm × 3.50L )

T₂ = 1830.9LatmK / 3.661175Latm

T₂ = 500.085K

T₂ = 226.9°C

Therefore, as the volume was decreased and pressure increased to the given values, the new temperature of the ideal gas is 226.9°C.

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Answer:

Organic compounds

Explanations:

Organic compounds usually have carbon bonded with one or more of the following: hydrogen, nitrogen, or oxygen

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Answer:

gamma decay.

Explanation:

A gamma decay emits only a gamma-ray photon,

While a certain isotope decays, it emits photons.It is a type of gamma decay.

Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.

Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.

They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable

Unstable isotopes are radioactive and are called as radioisotopes.Some of these isotopes are man -made and hence also called as artificial isotopes.Every element has an isotope which is either man-made or natural .

Many properties of isotopes depend on mass which is measured in atomic mass unit. The difference in actual mass and mass number is called mass defect.

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This is defined as a chemical substance which can react with a base to form a salt in a reaction.

The appropriate acid suffixes and conditions is however correctly given above.

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Explanation:

Molarity = mol/L or g/L

Data:

Mass>80.0g

Mr of CaCl2>111.1g/mol

V>500mL

Convert mL to Litres;. mole=g/Mr

1L=1000mL. =80g/111.1g/mol

x=500mL. =0.720072007mol

x=0.5L

Molarity= mole/volume

=0.720072007mol/0.5L

=1.440144014mol/L

=1.4401mol/L

Hope this helps. Depending on the question you can also find it in g/L but mol/L is safer.

Answer:

damming rivers for hydroelectricity, using water for farming, deforestation and the burning of fossil fuels.

Explanation:

Answer:

How do you think plants would grow in space? Which tropism(s) would be affected and why?

In the absence of gravity, plants use other environmental factors, such as light, to orient and guide growth. A bank of light emitting diodes (LEDs) above the plants produces a spectrum of light suited for the plants' growth. Enjoy don't  fail :)

Explanation:

In an ecosystem like space where there is no gravity, geotropism would be affected .

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

It is already balanced

Explanation:

hbr     +    khco3  ===>  h20 + kbr + co2     IS BALANCED

DISTURBANCE in carbon dioxide in your tissues leads to CHANGE in pH of cerebrospinal fluid and blood, which ultimately causes your breathing to speed up.

The carbondioxide in the tissues are transported in the blood from the bodily tissues to the lungs through binding to hemoglobin or as a bicarbonate ion. the disturbance of CO₂ in the tissues will lead to a change in the pH level of the cerebrospinal fluid which leads to an increase in breathing speed.

Hence we can conclude that Disturbance in carbon dioxide in your tissues leads to Change in pH of cerebrospinal fluid and blood, which ultimately causes your breathing to speed up.

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The final temperature of the nitrogen gas is equal to 23.5 °C.

The ideal gas equation describes the behavior of the state of a perfect gas. This equation defined that the product of the pressure and volume is equal to the product of the moles and absolute temperature of the gas.

The ideal gas equation can be expressed as shown below:

PV = nRT

Where n is the moles, V is the volume, R is the gas constant and T is the temperature.

Given, the temperature of nitrogen gas, T₁ =  17° C = 273 + 17 = 290 K

The pressure of the nitrogen gas, P₁ = 737 mmHg = 1.03 atm

The volume of the gas, V₁ = 26.5 ml = 0.0265 L

The pressure of the nitrogen gas, P₂ = 737 mmHg = 1.03 atm

The volume of the gas, V₂ = 27.1 ml = 0.0271 L

(P₁V₁)/T₁ = (P₂V₂)/T₂

[tex]{\displaystyle T_2 =\frac{P_2V_2T_1}{P_1V_1}[/tex]

[tex]{\displaystyle T_2 =\frac{1.03\times 0.0271\times290}{1.03\times 0.0265}[/tex]

T₂ = 296.5 K

T₂ = 296.5 -273 = 23.5 °C

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Answer:

D = melting and vaporization

Explanation:

Pretend this is very cold ICE

A   heat the ice up to melting point

B  melt the ice to waterheat the water to boiling

D  change water to steam

E   heat the steam up (superheat the steam)