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Answer:

Asia

Explanation:

Answer:

B and C

Explanation:

I just took the test

Answer:

B. and C.

Explanation:

Answer:

Fossils also help us to infer why dinosaurs and other organisms became extinct. Fossils tell us that there was a mass extinction at the time of the dinosaurs. They died out about 65 million years ago, along with more than half of all the other animal and plant species. ... Without plants, dinosaurs could not survive.

Explanation:

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Answer:

207.2

Explanation:

One mole of lead weighs 207.2 g. Thus, number of moles in 454 g of lead is determined by dividing the given mass by atomic mass that is ., 2.19 moles.

Lead is 82nd element in periodic table. It is in 14th group. Lead is classified among non-metals but it is a heavy metal in nature. Lead have many naturally stable isotopes of which two are radioactive.

A substance containing 6.02 × 10²³ atoms is called its one mole. This number is called Avogadro number. Hence, one mole of every elements contains Avogadro number of atoms. The mass of one mole of an element is called its atomic mass.

Atomic mass of lead (Pb) = 207. 2 g/mol

thus, number of moles in 454 g of Pb = given mass/atomic mass

no.of moles = 454 /207.2 = 2.19 moles.

Therefore, the number of moles of Pb in 454 g is 2.19.

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Answer: Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

Explanation: hope this helps

Gene variants, sometimes known as mutations, can cause genetic differences, or a normal process in which genetic information is rearranged as a cell prepares to divide can also cause genetic variations. Different phenotypes can be introduced into an organism by genetic changes that change gene activity or protein function.

An alteration in the nucleic acid sequence of an organism's, virus's, or extrachromosomal DNA is referred to as a mutation. DNA or RNA can be found in the viral genome.

Mutation, chance mating, chance fertilization, and recombination between homologous chromosomes during meiosis can all result in genetic variation. Genetic variety is primarily caused by mutations, although it is also influenced by other processes, including genetic drift.

A single nucleotide base can change in a genetic mutation known as a point mutation. DNA mutation, gene flow, and sexual reproduction are the main causes of genetic variation.

Thus,Mutation and genetic recombination are two of the many processes that cause genetic variation.

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Answer:

Yes, it is a fact that saturated fats contain more gross energy due to higher H+ concentration. However, unsaturated fats are more digestible and have higher absorption rate, and therefore the metabolizable energy that unsaturated fats provide is higher than that provided by saturated fats.

Explanation:

When the blood pH increase from the normal, carbonic acid is the chemical which neutralize it.

We know that acid neutralizes base whereas base neutralize acid. In the blood, bicarbonate ion is responsible to neutralize acid.

While on the other hand, bases in the blood increase the pH which are neutralized by carbonic acid (H2CO3) so we can conclude that carbonic acid neutralizes increase pH of the blood.

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Answer:

an acid

Explanation:

An acid is a substance that donates hydrogen ions.

Answer:

electromagnetic waves

Explanation:

Radiation is the transfer of heat energy through space. Most of them are sent through electromagnetic waves.

Answer:

D. tap water

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Answer: ethanol

Explanation: as it is a pure compound and can sometimes be a mixture while all the rest are mixtures.

Particles are the smallest units of any state of matter that moves in a medium due to various factors. The particle movement best supports the collision theory.

In a reactant, the particles move and collide with each other resulting in some amount of change and the collision between the atoms and the molecules are necessary for a chemical reaction to occur.

This theory of collision is used for the prediction of the rate of the reaction to occur and the chemical changes occurring in a gas or the reactant. This aids in understanding the rate of reaction occurring in a system.

The collision of the particles is proportional and related to the rate of the reaction. The amount of the concentration and their collision affects the rate at which the chemical change will occur.

Therefore, option A. the collision theory is supported here.

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K^+ can not exists because electrons are removed from an inner shell. The ion O^- can not exist because it will have an incomplete octet.

Ions are species that contain a positive or a negative charge. When we consider the electron configuration of ions, we can deduce the stability of the ion.

Let us consider the electron configuration of K^2+ which is 1s2 2s2 2p6 3s2 3p5 which means that the second electron is to be removed from an inner shell which implies greater energy expenditure hence it does not exist.

In the case of O^-, involves the formation of an ion with an incomplete octet which is not possible.

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Explanation:

I answered your question in the submitted photo

Answer:

Carbon is never really lost in the cycle. Carbon is constantly added and removed from the carbon cycle. Example.....  Carbon dioxide is removed from the air by photosynthesis and dissolving in the ocean buttttt at the same time it is added to the atmosphere by respiration and combustion.

As for the mass and energy....the Law of Conservation of Matter states that matter cannot be created or destroyed.

Answer:

no its not ever lost

Explanation:

Answer:

C=C divided by the co effiecient 11 would make the denominator of the photosynthesis equal 11 over 5 making this problem a polywhirl which wouldnt matter in the sense of the quake in energy change so thus making the answer 728 kJ/mol

Explanation: back in my day

endothermic: Heat is absorbed by the system from the surroundings. exothermic: Heat is released by the system into the surroundings.

Answer:

When an atom of sodium and an atom of fluorine combine to form the salt, sodium fluoride, an ionic bond, is formed.

Explanation:

Answer:

It might cause fire or extreme smoke.

Explanation:

According to the number of bonds present in a methane molecule, in the combustion of one methane molecule, four C-H covalent bonds are broken.

A methane molecule is composed of four atoms of hydrogen and one atom carbon.

The formula of a methane molecule is CH4.

The bonds present in methane molecule are four C-H covalent bonds.

Therefore, in the combustion of one methane molecule, four C-H covalent bonds are broken.

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Explanation:

this is a very easy question, you just need to know the formula of density, the mass and volume.

you're given the mass of the iron which is 28.5g and when it is submerged into a cylinder containing 45.50 ml, it rises to 49.10 ml. the volume of water displaced gives you the volume of the iron. thus,

V² - V¹ = 49.10 ml - 45.50 ml

V of iron = 3.6 ml

now that you know both the mass and volume, you can work out the question.

density (ρ) = mass / volume

ρ = m/v

ρ = 28.5 g / 3.6 ml

ρ = 7.916666...

ρ = 7.92 g/ml (3 sf)

hope this helps you!

- s.

Answer:

A (2.475 mol O2). B (11.35 g)  C. (.4875 mol O2)

Explanation:

A.

convert 25.9 g C4H10 (68g/mol) to mol. --> .3808 mol

then use mole ratios from equation

.3808 mol C4H10 x (13 mol O2 / 2 mol C4H10). ---> 2.475 mol O2

B.

convert 22.2 g CO2 (44g/mol) to mol. ---> .5045 mol

.5045 mol CO2 x (10 mol H2O / 8 mol CO2) ----> .6306 mol H2O

convert .6306 mol to g ----> 11.35 g

C.

.3 mol CO2 x (13 mol O2 / 8 mol CO2) ---> .4875 mol O2

Answer:

give answer of following questions and get 35 points.

Answer:

carbon dioxide and water

Explanation:

The process by which plants make their food with the help of water, carbon dioxide, sunlight and convert it into sugar and provides energy to the plant.

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The temperature that must be to freeze the solution would be -21.1 ° C.

To calculate the freezing temperature we must take into account the following information.

According to the above, it can be inferred that the puddle has a 50% concentration of salt because they had 12 kg of water and 6 kg of salt.

So the lowest freezing temperature would be 21.1°C because the puddle is 50% concentrated.

Note: This question is incomplete because there is some missing information. Here is the missing information:

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Yes it is but I have to check so wait

Answer:

- breaking it down into sections

-learn the element song

-use colors to learn the element groups

Explanation:

what also may help which is time-consuming is writing it out over and over if not I would prefer to learn the song it may seem childish a little but it will help in the long run.

Answer:

I personally have a method for learning stuff like this.

Try going one at a time, and ever once in awhile. Like memorize the first element, then the one next to it [in whichever order you please]

Ex: memorizing 1-10

1.. 1,2.. 1,2,3.. 1,2,3,4..

And then repeat that row until you can recite it almost without hesitation, then move onto another line.

This works for both placement memorization and element name.

Answer:

To calculate the percent composition, we need to know the masses of C, H, and O in a known mass of C9H8O4. It is convenient to consider 1 mol of C9H8O4 and use its molar mass (180.159 g/mole, determined from the chemical formula) to calculate the percentages of each of its elements:

%

C

9

mol C

×

molar mass C

molar mass

C

9

H

18

O

4

×

100

=

9

×

12.01

g/mol

180.159

g/mol

×

100

=

108.09

g/mol

180.159

g/mol

×

100

%

C

60.00

%

C

The partial pressure is the pressure exerted by individual gas in the mixture. The total pressure of the tank is 5.95 atm.

According to the Dalton's law of vapor pressure, the total pressure of the gas is the sum of the partial pressure of individual gas in the mixture.

The tank has mixture of nitrogen and oxygen gas. The partial pressure of nitrogen gas ([tex]P_{N_2}[/tex]) is 1.61 atm, and the partial pressure of oxygen ([tex]P_{O_2}[/tex]) is 4.34 atm.

The total pressure of tank ([tex]P[/tex]) according to Dalton's law can be given as:

[tex]P=P_{N_2}+P_{O_2}\\P=1.61+4.34\;\rm atm\\\textit P=5.95\;atm[/tex]

The total pressure of the tank is 5.95 atm.

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The Triassic period is one of the geological periods and is the shortest of the Mesozoic era. Cambrian is the older era than the Triassic period.

The Triassic period existed 250 -200 million years ago and started after the vastest and most extreme devastation ever. It is the 1st period of the Mesozoic and is known for the movement of the Dinosaurs on the land, flying pterosaurs and swimming plesiosaurs and ichthyosaurs.

The Cambrian is the period of the Paleozoic era and is the most important period because of the appearance of many animals. In this period, the temperature raised on the planet and the ice sheets melted at a very dangerous rate leading to mass devastation.

Therefore, option A. Cambrian is older than the Triassic period.

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Answer:

A: Cambrian!

Explanation:

got it right on ed :)