match the following ​

Answer:

Explanation:

Formula

% = (dicots/angiosperms) * 100

Givens

angiosperms (total) = 260000

Dicots                      = 195000

Solution

% = (195000/260000) * 100

% = 0.75 * 100

Answer: % = 75% are dicots

The balanced half reaction equation is MnO4^- + 4H^+ ------>MnO2 + 2H2O + 3e

The term redox reaction has to do with a reaction in which there is a loss or  gain of electrons. In this reaction, one specie accepts electrons while another specie looses electrons.

The balanced half reaction equation in acid is; MnO4^- + 4H^+ ------>MnO2 + 2H2O + 3e

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The solution to the polynomial expression since the power of the variable is in the second degree is 6.29 × 10² cm

The power of a variable refers to the exponent of the variable and the highest power of a variable is the degree to which the variable is being raised. From the information given, the highest power of the variable is a polynomial.

Given that:

[tex]\mathbf{= 2.150 \times 10^2 \ cm + 7.34 \times 10^2 \ cm - 3.2 \times 10^2 \ cm }[/tex]

So, since the exponents are in the same power we are going to add them all together multiplied by their exponent.

i.e.

[tex]\mathbf{= (2.150 + 7.34 - 3.2) \times 10^2\ cm }[/tex]

[tex]\mathbf{= 6.29 \times 10^2\ cm }[/tex]

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Answer:

cW = 4.2J/g.k

Explanation:

Heat gained = Heat lost

iron(mc∆€) = water(mc∆€)

mi= 100g

ci = 0.449

∆€i= 150-25 = 125

...

mw= 268.5g

cw = ?

∆€w=25-20 = 5

...

100×0.449×125= 268.5×cw×5

5612.5= 1342.5cw

cw = 5612.5/1342.5

cw= 4.18 ~ 4.2J/g.K

Answer:

Explanation:

The immediate product of neutron absorption by Ag-107 is silver atom with a mass of 108, Ag-108.

Radioactivity is the spontaneous emission of radiation as wall as particles and energy l by the nucleus of elements due to their disintegration.

The radioactive particles that are usually emitted include:

The neutron has a mass of 1.

When silver isotope having a mass of 107 absorbs a neutron, the silver isotope produces will have a mass of 108, Ag-108.

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Answer:

0.1077 grams

Explanation:

First we will employ the ideal gas law to determine the number of moles of nitrogen gas.

PV=nRT

P=2 atm

V=20L

R=0.08206*L*atm*mol^-1*K^-1

T=323.15 K

Thus, 2atm*20L=n*0.08206*L*atm*mol^-1*K^-1*323.15K

K, atm, and L cancels out. Thus n=2*20mol/0.08206*323.15=1.5 moles

Lastly, we must convert the number of moles to grams. This can be done by dividing the number of moles by the molar mass of nitrogen gas, which is 14 grams.

1.5/14=0.1077 grams

Answer:

Si, Sn, Cs

Explanation:

                       Atomic no.          Atomic radius

Silicon Si_______14___________0.117
Tin         Sn______50___________0.140
cesium Cs______55___________0.262

Silicon is the smallest among these

Answer:

Answer C

Explanation:

Chemical Bonds

The concentration of a substance can be expressed using molarity, molality or percent.

The term concentration has to do with the amount of substance present in solution. Now let us solve the problems individually;

a) Number of moles =  0.850 grams/80 g/mol = 0.011 moles

molarity = 0.011 moles/345 * 10^-3 L = 0.032 M

b) Number of moles =  13.5g /58 g/mol = 0.23 moles

molality = 0.23 moles/250 * 10^-3 Kg = 0.92 m

c) Number of  moles = 16.5 g/128 g/mol = 0.13 moles

molality = 0.13 moles/54.3  * 10^-3 Kg =2.39 m

d) Total mass present =  12 g +  18 g + 25 g + 500 g = 555 g

mass percent of calcium sulfate =  12 g/555 g * 100/1 = 2.2 %

mass percent of sodium nitrate =  18 g/ 555 g  * 100/1 = 3.2 %

mass percent of potassium chloride = 25 g / 555 g  * 100/1 = 4.5%

mass percent of water =  500 g / 555 g  * 100/1 =90.1%

e) Total mass present = 125 g + 1500g = 1625 g

Mass percent of NaCl =  125 g/1625 g * 100/1 = 7.7%

f) Total volume of solution = 15 L +  28 L  = 43 L

percent by volume of acetone = 15 L/43 L * 100/1 =  34.9%

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The number of moles will be 0.178 moles. It can be calculated by ideal gas law.

The ideal gas law  gave the relationship between pressure, volume as well as temperature. It can be expressed as:

PV =nRT

Where, P is pressure, V is volume and T is temperature.

Calculation of number of moles by using ideal gas law.

Put the value of given data in above ideal gas law formula.

n = PV / RT

n = (1 atom × 4 L)/ (0.0821  × 273 K

n = 0.178 moles.

Therefore, the number of moles will be 0.178 moles.

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92238U→90234Th+24He2 is a Niclear reaction

Nuclear reaction involves Nuclear elements.

It is usually defined as spontaneous emission of electrons.

Uranium 238 is a nuclear element

The reaction that represents a nuclear reaction is : ( C ) 92238U→90234Th+24He2+

A nuclear reaction is a process whereby two nuclei collide to form one or more nuclides. There are 4 different types of nuclear reaction and they are ;

Uranium 238 is a nuclear element therefore the reaction involving Uranium 238 is a nuclear reaction.

Hence we can conclude that The reaction that represents a nuclear reaction is : ( C ) 92238U→90234Th+24He2+

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Answer:

211.2g/mol

Explanation:

[tex]mass \: of \: carbon = 12 \\ mass \: of \: lead = 12(17.6) \\ = 211.2gmol {}^{ - 1} [/tex]

Answer:

From the given balanced equation, the valid mole ratio is four moles of Fe over 3 moles of moles of c02..

Explanation:

Mole ratio can be defined as the ratio of mole compound with the another.

Answer:

Deposition

Explanation:

Deposition is a process that lays down sediment and changes the shape of the land.

The purpose of both mitosis and meiosis is to increase the number or population of cells in the body.

Mitosis produces two diploid (2n) cells that are identical to the original parent cell whereas meiosis produces four haploid (n) cells that are different from the original parent cell.

Mitosis occurs in somatic cells whereas meiosis occurs in reproductive cells.

So we can conclude that the purpose of both mitosis and meiosis is to increase the number or population of cells in the body.

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Answer:

Yes, they are same

Explanation:

Glycosphingolipids are a subtype of glycolipids containing the amino alcohol sphingosine. They may be considered as sphingolipids with an attached carbohydrate. Glycosphingolipids are a group of lipids (more specifically, sphingolipids) and are a part of the cell membrane.

Answer:

glycosphingolipid is an example of sphingomyelin

The compound name for the compound structure given in the question is 2, 3-dimethlypentane

The international union of pure and applied chemistry (IUPAC) has organised a principle by which organic compounds are named. This principle includes:

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Temperature and pressure control the phase of a substance. A phase diagram is a graph of pressure versus temperature that shows in which phase a substance exists under different conditions of temperature and pressure. A phase diagram typically has three regions, each representing a different phase, and three curves that separate each phase.

In a phase diagram, the three regions correspond to the three common phases of matter: solid, liquid, and gas. The curves that separate each phase are known as phase boundaries or phase transition lines. These curves represent the conditions (specific combinations of pressure and temperature) at which phase transitions occur, such as melting (solid to liquid), boiling (liquid to gas), or sublimation (solid to gas).

Each phase boundary on the phase diagram represents the equilibrium between two phases, and the triple point, where all three phase boundaries intersect, represents the conditions where all three phases coexist in equilibrium.

Phase diagrams are essential tools in understanding the behavior of substances under different temperature and pressure conditions and are used in various fields, including chemistry, physics, and materials science. They provide valuable information about the stability and existence of different phases and the conditions under which phase transitions occur.

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Transport media is a significant pollution source by emitting gasses and particles. YES. Automobile makers should adhere to quotas for zero-emission vehicles.

These are cars, trucks, and buses that mostly run on electricity. The pollution degree caused by these vehicles is highly reduced compared with ordinary vehicles because of the reduction in fuel use and the consequent reduction in gasses and other substances emissions.

There are three types of zero-emission vehicles

Currently, and for decades, transport media are one of the most significant sources of gasses and other polluting substances emissions that lead to an increase in the greenhouse effect and global warming. Some of them are mentioned in the article -VOCs, nitrogen oxide, carbon monoxide, and dioxide, hydrocarbon-.

These are all primary pollutants suspended in the air that can produce secondary pollutants.

The mentioned pollutants could be significantly reduced by substituting transport media or improving the combustion processes. This last goal could be achieved by using alternative fuels and technologies or by using catalytic converters.

A considerable reduction in pollutant emissions from Zero-Emission Vehicles has already been proven in many countries. So several actions and regulations should be done about it to decrease even more -to near-zero- gasses and other particles emission. And more countries should be involved.

Following this thinking line, the answer is YES. Automobile makers should adhere to quotas of zero-emission vehicles set by states, even if it causes automakers to lose revenue.

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Mass of 1.5 mole of electron is 0.8229 mg

mass of electron = 9.11 * 10^-31 kg

mass of 1 mole of any substance ( Avagadro number ) = 6.022 * 10^23 /mol

1.5 moles of electron  = 1.5 * 6.022 * 10^23 = 9.033 * 10^23 /mol

mass of 1.5 mole of electron = 9.033 * 10^23 * 9.11 * 10^-31

mass of 1.5 mole of electron = 8.229 * 10^-7 kg

mass of 1.5 mole of electron = 8.229 * 10^-4 g

mass of 1.5 mole of electron = 0.8229 mg

Hope it helps.....

Answer:

Gas:

- No fixed shape or volume

- Molecules are very loosely packed

- Flows in all the directions

Liquid:

- No fixed shape but has volume

- Molecules are closely packed

- Always flows from higher to lower level

For the maximum concentration of Ag+ is mathematically given as

x = 3.6×10−5

Generally, the Ksp equation for this reaction is mathematically given as

[tex]K_{sp}=[Ag^+]^2[CO_3^{2-}][/tex]

[CO3^2-]=0.00620M

Ksp =[Ag+}^2 x 0.00620

8.1x10^-12 = x^2 x 0.00620

x = [tex]\sqrt{8.1*10^{-12}/0.00620}[/tex]

x = 3.6×10−5

In conclusion, the maximum concentration of Ag⁺ is

x = 3.6×10−5

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2.N + 4.H = 0

2N + 4.1 = 0

2N=-4

N=-2

Answer:

39.379 liters

Explanation:

One mole of gas at STP = 22.4 l / mole

22.4 l/mole * 1.758 mole = 39.379 liters