If a rock contains 75% lead 206 (Pb206) and 25% uranium 238 (U238), how old is the rock? Explain how you determined the answer. (2 points)

Answer:

Your answer would be:
C.) Praire Grass

Explanation:

In a prairie ecosystem, the population (grass, sun, etc.) with the most amount of stored energy for use by other organisms would be the prairie grasses. The grasses will gather the energy from the sun storing it. A herbivore would come along and eat it gaining energy from it. Unfortunately, the herbivore will only gain an amount of energy that is 10x less than the plant had. If a carnivore ate the herbivore then the carnivore would gain energy but 10x less than the carnivore had gained.
(Example)

Plant: 1,000,000 *gathers energy from the sun*

Herbivore: 100,000 *gains energy but, 10x less than the plant gained*

Carnivore: 10,000 *gains energy but, 10x less energy than the herbivore gained*

Fungus: 1,000 *in a process called decomposition the fungus will gather energy from a dead organism* *the energy it gets may vary because it depends if it is a herbivore or carnivore that has decomposed* *In this example however it is a carnivore*

Animals that eat fungus: 100

Animals that eat the animal up above: 10

And it's important to see that as the energy is dispersed more and more it, becomes less energy given to each organism.


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I really hope this diagram helped you.

If you have further questions don't hesitate to ask :)

Answer:

Independent variable: different alcohols

Dependent variable: red dye

kinetic energy

Explanation:

energy associated with motion is kinetic energy

Answer: Kinetic Energy

Explanation: Kinetic energy is the energy of mass in motion. The kinetic energy of an object is the energy it has because of its motion. ... Note that energy is a scalar quantity, i.e., it does not depend on direction, and it is always positive.

Answer:

A molecular formulae________

will tell you how many and what

kinds of atoms are in a molecule, but not how they are

arranged.

Answer:

2C4H10 + 13O2 -＞ 8CO2 + 10H2O

Explanation:

c = 8 8

h = 20 20

o = 26 26

Answer:

11.647g of water may be produced.

Explanation:

chemistry of the reaction:

2O2 + 2H2 ----> 2H2O + O2

64g + 4g yields 36g of water,

20g + 2g yields 11.647058824g of water

I believe the answer is (B) as molten Kevlar when spun into fiber, its polymers have a crystalline arrangement.

Hope that helped!

Answer:

The molecules stack together in crystal-like structures

Explanation:

i've taken the test

Answer:

2.3 mol of N2

Explanation:

mol N2 = 3.5 mol O2 x. 2 mol N2  

3 mol O2. = 2.3 mol N2.

The continents of today contain remnants of their distant history. The presence of glaciers, fossils, and complementing coasts provides evidence of how the plates originally interacted. Plants and animals used to exist, and fossils when and where they did.

Any surviving remnants, impression, or evidence of a once-living creature from a previous geological epoch is referred to as a fossil. Examples include fossilized bones, shells, exoskeletons, animal or microbe impressions in stone, amber-preserved artifacts, hair, petrified wood, oil, coal, and DNA traces.

There are four basic categories of fossils, each generated in a unique method and useful for conserving various kinds of animals. These include true form fossils, mold fossils, cast fossils, and trace fossils.

In river valleys, cliffs, hillsides, and man-made exposures like quarries and road cuts, sedimentary rocks of the appropriate age are exposed, and these are the places where fossils are most commonly found.

Thus,  Plants and animals used to exist, and fossils when and where they did.

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Explanation:

45.8 grams of Fe2O3*(1 mole/159.69 g)= moles of Fe2O3

moles of Fe2O3 *(3 moles of O2/2 moles of Fe2O3)=moles of O2

moles of O2*(32.0g of O2/1mole)= mass of O2

A

I m not sure ...........................

Answer:

18,000

Explanation:

Answer:

6. The log or sticks  is seen as stored potential energy (in the form of chemical energy). Stored potential energy is released by burning the log. The chemical reaction which comes from burning the log is called combustion. Combustion can only happen if oxygen is present. Combustion changes the potential chemical energy into kinetic energy in the form of heat.

7. Hair dryers use three different types of energy to work: Electrical energy, heat energy, and mechanical energy.

8. electrical energy - mechanical energy

9. electrical energy - thermal energy

10. electrical energy - sound energy

Explanation:

Answer:

Development of synthetic drug and fabric

Nuclear energy and bomb testing

Increased nitrogen fixation

Explanation:

This is because these things help global warming and animal extinction

The degree of hydrolysis of 02.M solution of NaHCO₃ = 2.33 * 10⁻⁸

Given data :

Concentration of NaHCO₃ = 0.2 M

Ka1 = 4.3 * 10⁻⁷

Ka2 = 4.8 * 10⁻¹¹

NaHC0₃  ----> Na⁺ + HCO₃

where : Na⁺ is a stronger and HCO₃ is weaker

Therefore;

hydrolysis will occur at HCO₃

HCO₃ + excess water --> H₂CO₃ + OH⁻ --- kh

kh = hydrolysis constant

Also

Kh = Kw / Ka1

where ; Kw = ionic product of water ( 10⁻¹⁴ ) , Ka1 = dissociation constant

Finally the degree of hydrolysis is

Kh = ( 10⁻¹⁴ ) / 4.3 * 10⁻⁷

    = 2.33 * 10⁻⁸

Hence we can conclude that The degree of hydrolysis of 02.M solution of NaHCO₃ = 2.33 * 10⁻⁸

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Answer:

The average pH today is 8.1, with 7.9 × 10-9 moles per liter of hydrogen ions. The original average pH was 8.2, with 6.3 × 10-9 moles per liter of hydrogen ions.

Using the formula, the percent increase in the number of hydrogen ions from then to now would be computed this way:

The hydrogen ion concentration and acidity of the ocean has increased by 25%.

Explanation:

There is a [tex]25%[/tex] % increase in acidity of the ocean when compared to the past.

An acid is a chemical species that can donate a proton or accept a lone pair of electron.

The average pH of ocean for the last 300 million years is 8.2.

The current pH of the ocean is 8.1.

Percent increase in acidity =

[tex]\frac{initial concentration of H^+ ions - final concentration of H^+ ions}{Initial concentration of H^+ ions}[/tex]   ×[tex]100[/tex]

Therefore, percent increase in acidity = [tex]\frac{7.9-6.3}{6.3}[/tex]×[tex]100[/tex][tex]=25[/tex]%

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Answer:

Nitrile, amide, carboxylic acid, phenyl (aka. arene)

**There are so many functional groups, so I may list some you don't know. There may also be some that I am not aware of. However, these are all the ones I can see.**

Explanation:

Nitrile: (bottom-left) N triple bonded to C

Amide: (middle) N single bonded to 3 carbons

Carboxylic Acid: (bottom-right) C-CO2H

Phenyl: (top-right) six carbon ring with alternating double bonds

The given reaction describes the decomposition of glucose into ethanol and carbon dioxide. This process is called fermentation. The reactant of this reaction is glucose.

Fermentation is the process of conversion of sugar molecule into other substance b the action of microbes such as yeast. In cellular respiration the glucose molecule is converting to carbon dioxide and water. Where as, in fermentation, the glucose is converting to carbon dioxide and ethanol.

The balanced chemical equation of the breaking of glucose into carbon dioxide and water is written as follows:

[tex]\rm C_{6}H_{12}O_{6} \rightarrow 2CO_{2} + 2C_{2}H_{5}OH.[/tex]

According to this reaction, one mole of glucose molecule gives 2 moles of carbon dioxide and 2 moles of ethanol. Hence, reactant in this reaction is glucose.

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Answer:

[tex]n_{solute}=0.235mol[/tex]

Explanation:

Hello.

In this case, we are talking about molarity which is an unit of concentration relating the moles of the solute and the volume of the solution in liters only:

[tex]M=\frac{n_{solute}}{V_{solution}}[/tex]

Since the solute is the (NH4)2Fe(SO4)2 and the volume in liters:

[tex]V=94.00mL*\frac{1L}{1000mL} =0.094L[/tex]

Thus, for the given 2.50-M solution, the moles of solute result:

[tex]n_{solute}=M*V=2.50mol/L*0.094L\\\\n_{solute}=0.235mol[/tex]

Best regards.

Not letting me add answer

Refer to the attachment

Answer:

Explanation:

Butane ⇒ Isobutane

ΔG = RT ln K

ΔG = - 18 + 15.9 = - 2.1 kJ / mol

- 2.1 x 10³ = 8.3 x 298 x lnK

lnK = .85

K = 2.33

[ isobutane ] / [ butane ]  = 2.33

isobutane / total mixture = 2.33 / 3.33 = .7

% of isobutane = 70 % .

70% is isobutane and 30 %  butane . Since equilibrium is tilted towards isobutane , it is more stable . Butane is straight chain and isobutane is branched chain compound .

Answer:

Temperature

Explanation:

.

Answer:

a

Explanation:

I just took the test

Based on the item bank, the various classification for each item are:

Both (Kinetic energy and  Potential energy):

Potential energy:

Energy can be defined as the ability to do work. Thus, energy must be possessed or transferred to an object or physical body before it can be used in doing a work or heating a system.

In Science, there are different forms of energy and these include the following;

Both (Kinetic energy and  Potential energy):

Potential energy:

Read more on potential energy here: https://brainly.com/question/1242059

Answer:

The wind knocked it over.

Explanation:

This is true because in many storms, there are very high wind speeds.

Answer:

Atomic number.

Because 2 values given here are 0.05g and one is 5.20g. So there are 2 atoms of one element or compound and one atom of another element or compound.

I am thinking there is an error in or sign. it is supposed to be  ± instead of st + as in 5.20 g  ± 0.05g.

0.05 g indicates the Measurement of Uncertainty

The mass of an object is reported as 5.20 g  ±0.05g.

 Here , the  Measurement of Uncertainty  ±0.05g. explains that Random error always occur when taking measurements reading with any scale.This tells us that the object's correct reading is between 5.15 g and 5.25 g from 5.20 g- 0.05g. and 5.20 g + 0.05g respectively.

See here on measrement of uncertainty:  https://brainly.com/question/13264555