Which system controls organs in times of stress?

Answer: because its more scientific and "formal"? I guess.

Explanation:

Answer:

lol this is what you get for stealing my points

Explanation:

Answer:chemical markers

Explanation:

I’m smart give brainlest plz

Answer:

C

Explanation:

The statement that best describes the influence that sexual reproduction has on genetic variation is as follows:

Thus, the correct option for this question is B.

Crossing over may be defined as a biological mechanism through which genetic material gets exchanged between the non-sister chromatids of the homologous chromosomes. The process of crossing over occurs in the Pachytene stage of mitosis.

Option C is incorrect because the process of crossing over never occurs between sister chromatids. So, it is eliminated. While options A and D are incorrect because they describe the mechanism of crossing over in the sense of meiosis which is absolutely incorrect.

Therefore,  the correct option for this question is B.

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Answer:

None

Explanation:

There are two S=O. bonds and two S-O bonds in sulfate ion lewis structure. Sulfur atom is the center atom and four oxygen atoms are located around sulfur atom. There are no lone pairs in the last shell of sulfur atom.

Answer:

Silicon tetrachloride

Explanation:

Answer:

B

Explanation:

it's all about the genetics of the horse

Answer:

1200g H20.

Explanation:

Write out the balanced equation... when an organic compound is burned, like C2H2, it is burned in oxygen (O2) and produces Water and Carbon Dioxide (CO2)

so 2C2H2 + 5O2  =  2H2O  + 4CO2

now that you have a balanced equation just convert to moles and solve

2000g C2H2 * 1mol C2H2 / 30gC2H2 * 2mol H2O/2mol C2H2 * 18gH2O/1molH20 = 1200g H20.

Answer:

86

Explanation:

According to the concept of percent yield, the percent yield of carbon dioxide is 72.51%.

Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.

In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .

In the given example, theoretical yield of carbon dioxide is as 32 g oxygen produces 44 g carbon dioxide,thus 32.5 g which is obtained by 2.5 moles of oxygen will require 32.5×44/32=44.68 g

Thus , on substitution in formula of percent yield, 32.4/44.68×100=72.51%.

Hence, the percent yield of carbon dioxide is 72.51%.

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Answer:

then it is 5

Explanation:

because i said it is

Answer:

C. Decomposition of potassium permanganate(Heating)

Explanation:

The equation of the reaction is given as;

2KMnO4 -> K2MnO4 + MnO2(s)  + O2(g)

Reactant = 2KMnO4

Products = K2MnO4 + MnO2(s)  + O2(g)

A. Oxygen turned in to carbon dioxide

Incorrect option - Oxygen is not the reactant

B. Sulphate and lithium boiled

Incorrect option -  Sulphate and lithium are not part of this reaction

C. Decomposition of potassium permanganate(Heating)

Correct option - potassium permanganate decomposed to form K2MnO4 + MnO2(s)  + O2(g)

D. None of the above

Incorrect option

Answer:

C

Explanation:

No change.

The total number moles of products = The Total number of reactants

Answer:

hydrochloric acid

Explanation:

In science, literature, and everything, equilibrium has the same meaning. The meaning simply put, is balance. If you wanted a sentence example, it could be something like:

'He sat down to try and recover his equilibrium.'

Or

'They can't maintain enough equilibrium to ride a bike.'

I hope you understand the meaning now?

Answer:

For example, when water solutions of calcium nitrate and sodium carbonate are mixed, calcium carbonate precipitates from the solution while the other product, sodium nitrate, remains dissolved. It is a precipitate.

Explanation:

Answer:

True

Explanation:

The reason why is because frost is a result of a chemical reaction

Answer:

Answer the first ine made up of 2 or more.....

All mixtures are made up of two or more elements or compounds.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

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Ammonia gas is a compound that is made up of two elements, nitrogen and hydrogen. So, option C is right.

A compound is a substance that is made up of two or more elements chemically combined. Ammonia gas is made up of the elements nitrogen and hydrogen, which are chemically combined in the ratio of 1:3.

Elements are the basic building blocks of matter. They cannot be broken down into simpler substances by chemical means. Atoms are the smallest unit of an element that can exist.

Mixtures are substances that are made up of two or more elements or compounds that are not chemically combined. The components of a mixture can be separated by physical means, such as filtration or distillation.

An atom is the smallest unit of an element that can exist and ammonia gas is not an atom because it is not the smallest unit of an element.

Therefore, option C, compound is correct.

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Answer:

143.9946 g

Explanation:

Answer:

I hope this will help you

Explanation:

The air that is inside a ship is much less dense than water. That's what keeps it floating! The average density of the total volume of the ship and everything inside of it (including the air) must be less than the same volume of water.

Please make me brilliant

Answer:

Limiting reactant: O2

grams NO2 produced = 230.276 g NO2

grams of NO unused = 26.67 gNO

Explanation:

2NO + O2 --> 2NO2

Step 1: Determine the molar ratio NO:O2

molar ratio NO:O2 = 5.895: 2.503 = 2.35

stoichiometric molar ratio NO:O2 = 2:1

So, O2 is the limiting reactant.

Step2: Determine the grams of NO2:

?g NO2 = moles O2 x (2moles NO2/1 mol O2) x (MM NO2/ 1 mol NO2) = 2.503 x 2 x 46 = 230.276 g NO2

Step 3: Determine the amount of excess reagent unreacted

moles excess NO reacted = moles O2 x (2 moles NO/1 mol O2) = 2.503 x 2 = 5.006 moles NO reacted

moles NO unreacted = total moles NO - moles NO reacted = 5.895-5.006 =0.889 moles NO unreacted

mass NO unreacted = moles NO unreacted x MM NO = 0.889 x 30 =26.67 g NO unreacted

Answer:

sorry if this is wrong but B

Explanation:

ITS C

Oxygen, APT, and Glucose

Answer:

true

Explanation:

Answer:

True

Explanation:

hope this helps:)))

Explanation:

➢number of moles. Moles and Chemical Reactions. Chapter 4. 3 H2. + N2. →. 2 NH3 ... How many grams of NH3 would form if 2.11 moles of N2 reacted with ...