What is the number 0.0513 expressed in scientific notation?

Answer:

18,000

Explanation:

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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I really hope this diagram helped you.

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

Answer:

45.35 converts to: 115.189cm

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:

Not letting me add answer

Refer to the attachment

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

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

Answer:

78.68g Na

121.32 Cl

Explanation:

This one is more easy than the wording makes it seem. Since there are 60.66g of sodium (Na) and 39.34g of Chlorine (Cl) it adds up to 100g, so in this case you can just double each amount, and get what each would be in a 200g sample.

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

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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They believing that all things consists of that from which they were originally generated is how they arrived at such conclusion.

This is a Greek word which refers to the origins and beginnings of n object or organism.

The earliest philosophers arrived at the conclusion that "this primary entity(arche) always persists as a result of all things comprising of that which they were originally generated .

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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:

[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.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 10 cc

density = 7.8 g/cc

So we have

mass = 7.8 × 10

We have the final answer as

Hope this helps you

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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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

The age of the rock can be calculated from the half life of Uranium - 238. The age of the rock sample is 9 million years.

The term radioactivity refers to the sponteanous decay of a material which leads to the production of daughter nuclei. We know that uranium 238 decays to lead 206  with a half life of 4.5 billion years.

Using;

0.693/t1/2 = 2.303/t log(No/N)

t1/2 = half life of uranium 238

t = age of the rock sample

No = initial amount of uranium 238

N = amount of uranium 238 after time t

Now;

0.693/4.5 * 10^9 = 2.303/t log (No/0.25No)

0.693/4.5 * 10^9 = 2.303/t log(1/0.25)

0.693/4.5 * 10^9 =1.387/t

1.54 * 10^-10 = 1.387/t

t =  1.387/1.54 * 10^-10

t = 9 million years

The age of the rock sample is 9 million years.

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Balanced reaction is given by

[tex]\\ \rm\Rrightarrow 2C_4H_10+13O_2\longrightarrow 8O_2+10H_2O[/tex]

On both sides

Hence balanced

Molar mass of butane:-

Moles of Butane:-

#16

Moles of CO_2:-

Mass of CO_2:-

#17

Moles of O_2

Mass of O_2

Answer: true

Explanation: An atom does of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. Protons and neutrons have nearly equal masses, but in a way they DO differ in charge.

Carbon, Oxygen and Chlorine all have eight valence electrons while hydrogen has two valence electrons.

The term Lewis structure refers to the structure of a molecule in which valence electrons are shown as dots and sometimes a dash is used to show bonding between two atoms.

In the molecule CHOCl, we have the Lewis structure as shown in the image attached to this answer. Carbon, Oxygen and Chlorine all have eight valence electrons while hydrogen has two valence electrons. Therefore, all the atoms in the molecue obey the octet rule.

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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 presence of hydrogen and hydroxyl ions determines the acidic and basic nature of a solution.

The use of the pH scale is one way of determining the acidic and basic nature of solution. If the pH of a solution is less than 7, it is considered as acidic and if the pH is 7, the solution is neutral.

While if the pH is greater than 7,the solution is basic so we can conclude that the presence of hydrogen and hydroxyl ions determines the acidic and basic nature of a solution.

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Answer:

Independent variable: different alcohols

Dependent variable: red dye

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.

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The equilibrium concentration of Ag⁺ in the solution is : 7.5 * 10⁻⁶ M

Given that :

Ksp for AgIO₃ = 3 * 10⁻⁸

First step : Calculate the concentration of Ag⁺ and IO⁻₃ in the solution

[ Ag⁺ ] = ( mmol Ag⁺ / mL solution )

          = ( 50 * 0.00200 / 100 mL ) = 0.001 M

[ IO⁻₃ ] = ( mmol IO⁻₃ / mL solution )

           = ( 50 * 0.0100 / 100 mL )  = 0.005 M

Next determine the Ionic product ( Q )

Q = [ Ag⁺ ] [ IO⁻₃ ]

   = 0.001 * 0.005

   = 5 * 10⁻⁶  

Since the value of Q is > Ksp a precipitate ( IO⁻₃ )  will be formed after the completion of the precipitation reaction

Therefore the concentration of the excess  IO⁻₃  = 0.400 mmol / 100 mL

                                                                                 = 0.004 M

Second step : considering the initial and final concentrations

Initial concentrations ( mol/ L )                  Final concentrations ( mol/L )

[ Ag⁺ ] = 0 M                                                  [ Ag⁺ ]  = x

[ IO⁻₃ ] = 0.004 M                                          [ IO⁻₃ ] = 0.004 + x

Final step : Determine the equilibrium concentration of Ag in the solution

Ksp = 3 * 10⁻⁸ = [ Ag⁺ ]  [ IO⁻₃ ]

                      =  ( x ) ( 0.004 + x )

Therefore x = 7.5 * 10⁻⁶ ( Equilibrium concentration of Ag in the solution )

Hence we can conclude that The equilibrium concentration of Ag⁺ in the solution is : 7.5 * 10⁻⁶ M

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Answer:

the two careers in science are :

1) Engineer

2)Doctor

Explanation: