Could someone pls help me if you know it!!

Answer:

-867.7kJ

Explanation:

3H2(g)+O3(g)—>3H2O(g)=

-867.7kJ

Answer:

A. Exactly 1.55 ounces

Answer:

Blues

Explanation:

Colors of Rainbow => ROYGBIV

Red    Orange   Yellow   Green   Blue   Indigo   Violet

low energy  => => => => => => => => => => high energy

low frequency => => => => => => => => =>  high frequency

long wavelengths => => => => => => => => short wavelengths

Note: All L's on the Left => low, low, long; other end are opposites.

Answer:

This is false.

Explanation:

This is false because water freezes at 32 degrees faraheint and carbon would freeze at a different temperature.

Answer:

an example is a dam

Explanation:

dams generate electricity, the water that flows through the dam have propellers that when turned send up energy to the generators which create power.

Answer: pretty sure it B

Explanation:

Answer:

the answer is b hope this helps

Explanation:

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Answer Electromagnetic waves are used to transmit long/short/FM wavelength radio waves, and TV/telephone/wireless signals or energies. They are also responsible for transmitting energy in the form of microwaves, infrared radiation (IR), visible light (VIS), ultraviolet light (UV), X-rays, and gamma rays.

Explanation:

Electromagnetic waves are important in society today because they are used to "transmit long/short/FM wavelength radio waves, and TV/telephone/wireless signals or energies. They are also responsible for transmitting energy in the form of microwaves, infrared radiation (IR), visible light (VIS), ultraviolet light (UV), X-rays, and gamma rays."

Answer:

cultures that contributed to modern scientific study ... Identify possible source of Earth's magnetic field ... turn it into glucose, animals eat plants, CO2 is released when when animal poops ... Describe one way ecosystems respond to change.

Explanation:

Answer:

I have it.

Explanation:

Answer:

[tex]molar \: mass \: of \: FeSO _{4}.7H _{2}0 = (56 + 32 + (16 \times 4) + (7 \times 18)) \\ = 278 \: g \\ \\ (278 \times 1000) \: mg \: of \: FeSO _{4}.7H _{2}0 \: contains \: (56 \times 1000) \: mg \: of \: Fe \\ 250 \: mg \: of \: FeSO _{4}.7H _{2}0 \: contain \: ( \frac{250 \times 56 \times 1000}{278 \times 1000} ) \\ = 50.35 \: mg \: of \: Fe[/tex]

The mass of Fe delivered by 250 mg Iron sulfate heptahydrate has been 50.35 mg.

The molar mass of the compound has been the sum of the mass of each element present in the compound. The given compound is iron sulfate heptahydrate. The compound has molar mass 278 grams.

1 mole of compound has been consisting of 1mole of iron.

278 grams Iron sulfate = 56 grams Fe

278,000 mg Iron sulfate = 56,000 mg Fe.

The mass of iron in 250 mg compound can be given as:

278,000 mg Iron sulfate = 56,000 mg Fe

[tex]\rm 250\;mg \;Iron\;sulfate\;=\;\dfrac{56,000}{278,000}\;\times\;250[/tex]

250 mg Iron sulfate tablet = 50.35 mg Fe.

The mass of Fe delivered by 250 mg Iron sulfate heptahydrate has been 50.35 mg.

For more information about the mass of compound, refer to the link:

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Answer:

it's answer is 24 yards

hope it helps you friend

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Answer:

the food chain you mean

Explanation:

pollution than mosquitoes then alligators

Answer:

Li

Explanation:

Answer:

b

Explanation:

Answer:

it is B hope I helped

=

Explanation:

Answer:

In the northern hemisphere I believe, Scorpius is most visible by looking to the south during July and August around 10:00 PM. The constellation remains visible until mid-September. In the southern hemisphere, Scorpio appears very high in the northern part of the sky until close to the end of September.

Answer:

October 23 to November 21

Explanation:

Not entirely sure what you are asking. . .

If we're talking Scorpius as in:

Scorpius is one of the constellations of the zodiac and is located in the Southern celestial hemisphere. Its name is Latin for scorpion, and its symbol is. (Unicode ♏).

Answer:

C

Explanation:

This is a correct answer i think soo

Answer:

Mass of carbon dioxide= 44 g

Explanation:

Zinc carbonate      →   Zinc oxide + carbon dioxide

  125 g                  =       81 g  + X

X = 125 g-81 g

X = 44 g

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

Answer:

Chemical to electrical to kinetic energy

Explanation:

In a battery-operated fan, first, the chemical energy stored in the battery is converted to electrical energy within the fan and then the electrical energy, in turn, is converted to kinetic energy which makes the blades of the fan rotate. The rotation of the fan creates a breeze that forces the evaporation of sweat molecules from the surface of the skin and causes cooling in return.

Answer:

a) silver

Explanation:

Given data:

Mass of object = 26.94 g

Volume of object = 2.568 cm³

Which subject is this = ?

Solution:

Formula:

d = m/v

by putting values

d = 26.94 g/ 2.568 cm³

d =  10.49 g/cm³

Densities of objects: g/cm³

iron =  7.874

gold = 19.32

silver =  10.49

copper = 8.92

Thus, given object is silver.

Answer:

Explanation:

- If there are 4 moles of Al that equals 107.926156 grams of 4Al.

- If there is 2 moles of Al2O3 that equals 203.9226 grams.

So...

If 107.926156 grams of 4Al equals 203.9226 grams of 2Al2O3 then, 3.64g of Al equals x.

When 6.8776g of aluminium reacts with an excess of oxygen, 6.8776g of aluminium oxide are produced.

Aluminium is a silvery-white metal with atomic number 13 in the periodic table.

Aluminium oxide is a chemical compound of aluminium and oxygen with the chemical formula Al₂O₃. It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium(III) oxide.

The synthesis of Aluminium oxide can be done by heating aluminium in the presence of oxygen. In this reaction, 4 moles of aluminium react with 3 moles of oxygen leading to the formation of 2 moles of aluminium oxide.

4Al + 3O2 → 2Al2O3

If there are 4 moles of Al that equals 107.926156 grams of 4Al

If there are 2 moles of Al2O3 that equals 203.9226g

If  107.9261 grams of 4Al equals 203.9226 grams of 2Al2O3 then, 3.64g of Al equals x

107.9261 / 3.64 = 203.9226 / x

(107.9261) x = (203.9226) 3.64

107.9261 x = 742.2782

dividing both LHS and RHS by 107.9261,

107.9261/107.9261x = 742.2782/107.9261

                              x = 6.8776g

Hence, 6.8776g of aluminium oxide are produced.

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Answer:

sulfer has 6 energy levels/orbits and 16 valence electrons

Answer:

Because we are not perfect

Explanation:

This day is added to the calendar as a corrective measure, because the Earth does not orbit the sun in precisely 365 days.

To solve this we must be knowing each and every concept related to autotroph. Therefore, eugenides and algae, both can be autotrophic. The correct option is option B.

An creature that can make its own sustenance out of inorganic materials is known as an autotroph. Contrarily, heterotrophs are species that can't make their own nutrition and must eat other organisms in order to survive.

In contrast to autotrophs, heterotrophs are unable to manufacture their own nourishment. Heterotrophs need to consume organic material in order to produce the nutrients needed for life, not inorganic. Eugenides and algae, both can be autotrophic.

Therefore, Eugenides and algae, both can be autotrophic. The correct option is option B among all the given options.

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Answer:

O volume of the solution

Explanation:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / volume of solution  in L

For example:

if we dissolve the 1 mole of NaCl to make the solution of volume 2 L. The molarity of solution is,

M = 1 mol / 2 L

M = 0.5 M

Answer:

r-o-r

Explanation:

B I'm not sure but good luck

The general structure of ether follows the R-O-R' pattern.

The general structure of ether is given by:

Where R and R' represent alkyl or aryl groups.

In other words, ethers contain a central oxygen atom and two alkyls or aryls at the extreme ends.

Thus, the correct general structure from the options would be B.

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