What makes this lever effective?
A: The man had more mass than the rock
B: The man is closer to the fulcrum than the rock is
C: The man is farther from the fulcrum than the rock is
D: The rock has more mass than the man

Answer:

ester, ether, haloalkane

Explanation:

EDG.2022

Answer:

Reverse Osmosis

Explanation:

Reverse osmosis systems are able to remove more contaminants than carbon, making them a popular choice for many consumers.

Answer: The primary consumers are zooplankton, corals, sponges, Atlantic blue tang, and queen conch.

Explanation:

Answer:

four single covalent bonds

Explanation:

cuz a carbon atom initially has four unpaired electrons in its outermost shell....sharing adds four more....making four bonds

Answer:

2,3-dimethyl pentane.........

The events in the order of top to bottom for a digital recording to become sound waves through a speaker include:

This is defined as a pattern of disturbance caused by movement of energy along a medium.

The order of events which produces the sound heard by audience can be seen above.

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Answer:

diamond, graphite (types of carbon) and silicon dioxide (silica).

Explanation:

Substances with giant covalent structures are solids with very high melting points. All the atoms are linked by strong covalent bonds, which must be broken to melt the substance.

Answer:

When liquid water reaches the freezing point, it expands. After placing a sealed glass container full of water into the freezer, we might expect it to freeze, expand, and either crack or shatter the glass.

Explanation:

The hydronium ion concentration when pH = 7 is :  8.75 * 10⁻⁹ mole/liter

Given that :

pH = 8.0

Hydronium ion concentration = 1 * 10⁻⁸ mole/liter

Resolving the question

8.0 = 1 * 10⁻⁸ mole/liter

7.0 =  x

therefore :

x = 7 ( 1 * 10⁻⁸ ) / 8.0

  = 8.75 * 10⁻⁹ mole/liter

Hence we can conclude that The hydronium ion concentration when pH = 7 is :  8.75 * 10⁻⁹ mole/liter

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Answer:

An expansion of suitable living space

Explanation:

Increase occurs in the population of the organism only occurs when there is a suitable environment present for that organism. Suitable environment means that place where all the needs of the organism are available such as food, water and shelter etc. If food and water are present in large amount and decrease in animals occurs that prey on that organism will increase the population of the organism.

the tongue and roof of the mouth

would be the answer

Answer:

Explanation:

#Jennifer

Aluminium is the metal which must release the most heat to experience a given decrease in temperature per gram of metal.

This is as a result of free electrons and is the ability of a substance to conduct heat.

Aluminium has the highest thermal conductivity in this case which is why it will release the most heat to experience a given decrease in temperature per gram of it.

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Answer:

See pictures!

Explanation:

Here is a drawing of butane (C4H10); labeled #1. An isomer of butane will also have the chemical formula C4H10 but is depicted different geometrically. I labeled this one #2.

Answer:

To calculate the no. of moles you must know mass and molar mass of the product

Explanation:

# of moles = mass/molar mass

Answer:

Magnesium

Explanation:

Terbium-147 undergoes positron emission to become a stable atom, the stable atom is ₆₄Gd¹⁴⁷.

Series (or family) of natural radioactive decay is the set of elements with unstable nuclei, which follow an orderly sequence of spontaneous decay, that is, they emit alpha and beta particles, until a stable lead nucleus is created.

In this case, natural radioactive decay occurs when the nucleus of the atom of some chemical element is unstable and then it "breaks", releasing electromagnetic radiation and disintegrating.

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Answer:

10. Butanoic acid

11. Methylpropanoate

Explanation:

In this case first you need to identify the functional group,secondly identify the longest chain that contains the particular functional group:

10. The functional group for this compound is a carboxylic acid due to the "CHO2" group..we have four carbons which makes the parent chain to be butane.since it's acarboxylic acid we replace the "e" at the end to "oic acid".

11. The functional group is ester "RCOOR".For the ester the longest chain is counted from the part of the carboxylic acid which in this case is a propane,and the part from the alcohol becomes a substituent. With esters you replace the "e" at the end of the parent name to "oate". When you write it down you begin with the substituent in this case "methyl" and the rest follows...



hope it is clear enough

-22°C + 273.15 = 251.15K

206°C + 273.15 = 479.15K

50°C + 273.15 = 323.15K

8°C + 273.15 = 281.15K

Answer:

18

Explanation:

The third shell has maximum capacity of 18 electrons. The maximum capacity of a shell can be calculated by the formula 2n^2. Where n is shell no. such as 3

Answer:

Explanation:

3 Apply Many scientific words, such as energy, also have everyday meanings. Use context clues to write your own definition for each meaning of the word energy.

Winds and ocean currents are evidence for the process of regulating and stabilizing the climate patterns.

Ocean current is the flow or movement of water in a direction by gravity, wind, and difference in density of the water.

Wind currents pull water and create ocean currents. The current flow to westwards, which is called Coriolis effect.

Thus, Winds and ocean currents are evidence for the process of regulating and stabilizing the climate patterns.

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Answer:

carbon dioxide + water+ energy+ soot+carbon monoxide

Answer:

48 000 cm^2

Explanation:

8000      1cm cubes

 each 1 cm cube side is  1 cm^2   and there are six sides to the cube , so each cube has   6 cm^2  surface area

  and there are  8000 of them     8000 * 6 cm^2 = 48 000 cm^2

The order of alkanes according to their increasing density can be seen below:

This is referred to a hydrocarbon with a single carbon to carbon bond and examples include butane etc.

Its density increases with increasing number of carbon and hydrogen atoms thereby making it the most appropriate choice.

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Answer: The temperature of the gas if 65.85g of N2 are placed in 17.5L container with a pressure of 1988 mmHg is 1780. 6° C

Explanation:

The ideal gas law states that the volume, pressure and temperature of the a gas is related to the number of moles.

It is represented thus;

P V = n R T

Parameters :

Pressure, P = 1988 mmHg

Volume, V = 17.5 L

number of moles, n = mass ÷ molar mass

mass of N2 = 65.84g

Molar mass of N2 = 28.02 g/ mol

n = 65.85 ÷ 28.02

n = 2. 350 moles.

Temperature = ?

Universal gas constant, R = 8.314 J/mol. K

Calculations :

T = P V ÷ n R

T = 1988 × 17.5 ÷ 2.350 × 8.314

T = 34790 ÷ 19. 5379

T = 1780. 6 ° C

Thus, the temperature of the gas is 1780. 6 ° C

Answer:

[tex]\boxed{N_t =0.1953125 \: grams}[/tex]

Explanation:

Formula:

[tex]N_t = N_0( { \frac{1}{2} })^{ \frac{t}{t_ \frac{1}{2} } } [/tex]

Where Nt is the amount of substance remaining after time t,

N0 is the amount of substance at time t = 0,

t is the time at which we have to find out how much substance disintegrated from t = 0 to t = t

& t_1/2 is the half life corresponding radioactive sample.

Given:

N0 = 200g

t= 40 days

t1/2 = 4 days

To find:

Nt =?

Solution:

Substituting given data in above formula,

[tex]N_t = N_0( { \frac{1}{2} })^{ \frac{t}{t_ \frac{1}{2} } } \\ N_t = 200( { \frac{1}{2} })^{ \frac{40}{4 } } \\ N_t = 200 \times 0.0009765625 \\ \boxed{N_t =0.1953125 \: grams} [/tex]

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The cubic unit cell  this metal crystallize as is BCC structure .

The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell.

The unit cell consists of lattice points that represent the locations of atoms or ions.

The entire structure then consists of this unit cell repeating in three dimensions

[tex]\rm \rho =\dfrac{nM}{N_{0} a^{3}} \\\\\\\\\rm n =\dfrac{\rho N_{0} a^{3}}{M} \\\\\\\\Assuming\; it \; to \; be \; a\; BCC\; structure \\\\\\ r = \dfrac{\sqrt{3} \times a}{4} \\\\\\Therefore\; a = 3.23 \times 10^{-8}\\\\\\\\\rm n =\dfrac{13.3 \times 6.022 \times 10^{23}\times 3.23^{3}\times (10^{-8})^{3}}{135} \\\\[/tex]

n= 2

Hence our assumption was correct

It is a BCC structure .

Therefore the cubic unit cell  this metal crystallize as is BCC structure .

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