Can someone help me with this

Answer: The mowed lawn is the one from where the grasses are removed by using the machines or tools.

Explanation:

The mowed lawn is expected to have low number of species as the grasses may be few or scanty thus can support the population of few species like insects, mice, birds, and small number of grazing animals. On the other hand the weedy field can be hub of insects, reptiles like snakes, small mammals, and large mammals. Large weed field can provide food, and habitat to the large number of species. This will support the increase in biodiversity as compared to the mowed lawn.

Answer: B. Allow for movement

Explanation: Because the muscular system is composed of specialized cells called muscle fibers. Their predominant function is contractibility. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction. Make sure to add me as a friend!!! <3 YW!!!

Answer:

during reaction magnesium lises ions.

Explanation:

magnesium reacts by losing two ions which makes it smaller in size.

Answer:

Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association

The ways Ions may form includes the following

An ion can be defined as an atom or group of atoms possessing an electrical charge. Ions are of two types, they are : Anions which are negatively charged and Cations which are positively charged.

In conclusion,  an ion can be formed by many ways, but a few has been listed above.

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Answer:

[tex]0.46[/tex] moles of water were removed from the sample by the heating process

Explanation:

Given

Mass of the evaporating dish [tex]= 6.488[/tex] grams

Mass of the sample of hydrate [tex]= 19.72[/tex] grams

Mass of the sample and dish after heating [tex]= 11.344[/tex] grams

The weight of water removed through evaporation

[tex]= 19.72 - 11.344 = 8.376[/tex] grams

Weight of one mole of water [tex]= 18[/tex] grams

Number of moles of water in [tex]8.376[/tex] Grams of water is equal to

[tex]\frac{8.376}{18} = 0.46[/tex] moles

Answer:

Explanation:

48833.03

Answer: The final pressure is 12.6 atm

Explanation:

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 5.6 atm

[tex]P_2[/tex] = final pressure of gas = ?

[tex]V_1[/tex] = initial volume of gas = v

[tex]V_2[/tex] = final volume of gas = [tex]v-\frac{50}{100}v=0.5v[/tex]

[tex]T_1[/tex] = initial temperature of gas = [tex]-19.0^0C=(-19+273)K=254K[/tex]

[tex]T_2[/tex] = final temperature of gas = [tex]12.0^0C=(12.0+273)K=285K[/tex]

Now put all the given values in the above equation, we get:

[tex]\frac{5.6\times v}{254}=\frac{P_2\times 0.5v}{285}[/tex]

[tex]P_2=12.6atm[/tex]

The final pressure is 12.6 atm

Answer:

The first one is ground and the second one is excited  

Explanation:

Answer:

The correct answer is - 0 degrees Celsius or 32 degrees  Fahrenheit.

Explanation:

The pure water freezes below zero degrees Celsius and forms ice which is started to melt at zero degrees Celsius as it gets the heat from the surroundings. The change in the heat or temperature of matter leads to a change in the state of matter.

Kate will find that the ice cubes formed from the pure water started to melt at 0 degrees Celsius or 32 degrees Fahrenheit with the help of sensor she has.

Answer:

Number of moles = 0.4626 (Approx)

Explanation:

Given:

Mass of copper = 29.4 gram

Find:

Number of moles

Computation:

Atomic mass of copper = 63.546

Number of moles = Mass / Atomic mass

Number of moles = 29.4 / 63.546

Number of moles = 0.4626 (Approx)

Chemistry is the scientific field that studies matter and substances. It involves composition, structure, arrangement, etc. It does not involve the height of waves in the surf. Thus, option C is correct.

Chemistry has been defined as the branch of study and science that studies, analyzes, investigates, and identifies matter and its components. It includes elements, molecules, and compounds.

The composition of ocean water involves the identification and analysis of the various substances. As ocean water is a matter and is studied in chemistry. The food the ocean fishes consume involves chemical composition.

The height of the waves in the surf is a measurement and is studied in mathematics and not chemistry. On the other hand, the composition of the surfboard involves the chemical and their bonds.

Therefore, option C . the height of the waves is not a topic of chemistry.

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Answer:

bird or bacteria and fungi

Explanation:

oof oof oof oof oof

Answer: [tex]LiF[/tex] , [tex]AlCl_3[/tex] and [tex]BeCl_2[/tex]

Explanation:

An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and the element which accepts the electrons is known as electronegative element or non metal.

A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals.

[tex]LiF[/tex] , [tex]AlCl_3[/tex] and [tex]BeCl_2[/tex] contain ionic bonds as they aremade up of metals and non metals.

Answer:

Smell: Most chemists can identify solvents by their distinctive smells (though this is a pretty bad idea). ¹

Melting point: If you've got very pure crystals, you can use their melting point to figure out which of several possible chemicals you've got.

Explanation:

I hope this helps and pls mark me brainliest :)

Answer:

the answer to the question is smell

Answer:

[tex]P_2=507.7torr[/tex]

Explanation:

Hello there!

In this case, when we have a gas that is undergoing a change in both pressure and temperature, we utilize the Gay-Lussac's equation as shown below:

[tex]\frac{T_2}{P_2}=\frac{T_1}{P_1}[/tex]

Thus, since we are given the initial pressure and temperature and the final temperature, we can compute the final pressure as shown below:

[tex]P_2=\frac{P_1}{T_1}*T_2[/tex]

So we plug in, by making sure the temperatures are in kelvins, to obtain:

[tex]P_2=\frac{550torr}{(117+273)K}*(87+273)K\\\\P_2=507.7torr[/tex]

Best regards!

Answer:

No, it is not appropriate to mix water and DMSO

Explanation:

We have to realize that DMSO is a highly polar solvent and water is a highly polar solvent. The question explicitly says that our target is to produce a solvent of intermediate polarity.

We can only do this by mixing a polar and a nonpolar solvent. We have been given the example of the mixture of acetone/hexane which is quite a perfect mixture.

Thus, it is inappropriate to mix DMSO and water.

The water-DMSO mixture has a high polarity and is not appropriate for intermediate polarity solution.

The interactions between solute-solvent result in the solubility and the polarity of the solution. The polar and non-polar solvents result in intermediate polarity of the solution.

The water and DMSO both are highly polar in nature. The addition of polar DMSO to polar water results in the dipole-dipole interaction between the molecules.

The interactions result in the solubility of the solute with solvent.  However, the polarity of the solution will be high as both the molecules gave synergistic mixture polarity to the solution.

Thus, to obtain the solution of intermediate polarity, water-DMSO mixture is not appropriate.

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Answer:

zwasetdrcyfvgybhuknjimk

Explanation:

Answer:

D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.​

Explanation:

Sulfur has an atomic number of 16. The atomic number represents the number of protons, so sulfur has 16 protons.

This atom of sulfur has a mass number of 33. The mass number is the sum of protons and neutrons. Then, the number of neutrons is 33 - 16 = 17

Sulfur is a neutral atom. Therefore, it has the same number of positive charges (protons) and negative charges (electrons). Thus, sulfur has 16 electrons.

Protons and neutrons are in the nucleus and electrons are outside the nucleus.

Taking all the above into account, the correct answer is:

D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.​

Answer:

D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.​

Explanation:

Sulfur has an atomic number of 16. The atomic number represents the number of protons, so sulfur has 16 protons.

This atom of sulfur has a mass number of 33. The mass number is the sum of protons and neutrons. Then, the number of neutrons is 33 - 16 = 17

Sulfur is a neutral atom. Therefore, it has the same number of positive charges (protons) and negative charges (electrons). Thus, sulfur has 16 electrons.

Protons and neutrons are in the nucleus and electrons are outside the nucleus.

Taking all the above into account, the correct answer is:

D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.​

Answer:

546 g NaCI

Explanation:

because 1 mole is equal to 1 moles NaCI or 58.44277 grams.

Answer:

The answer is that compounds are formed when elements are joined and held together by strong forces called chemical bonds. ... Covalent bonds share electrons between atoms in order to fill their electron shells. In the compound, molecules are held together by the attraction between the nucleus and the shared electrons.

Millions of compounds can be made from just 100 elements because the atoms of these 100 elements can combine with each other in different ways to produce countless compounds.

A compound is formed when atoms of two or more elements are chemically combined together.

100 elements can combine with each other in many different ways. For instance, carbon combines with almost all the known elements to form unique compounds in each case depending on the arrangement of atoms of elements or type of element in each of the compounds formed.

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Answer:

C. it is much less because at high pressure the temperature drops

At high pressures, the volume of a real gas  is much less because at high pressures the temperature drops.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.Usually as the pressure increases ,volume increases.

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Answer:

You need to add 0.243g of NaOH to raise the temperature back to 16.2°C

Explanation:

Using the equation:

Q = C*m*ΔT

Where Q is heat

C is specific heat

m is mass

and ΔT is change in temperature

We can find the heat required to increase the temperature of the solution back to 16.2°C:

Assuming specific heat of the solution of water + K2SO4 = Specific heat of water:

C = 4.184J/g°C

m = 1.56g + 6.00g = 7.56g

ΔT = 16.2°C - 7.70°C = 8.50°C

Q = 4.184J/g°C * 7.56g * 8.50°C

Q = 268.86J = 0.269kJ of heat are required

As this heat is obtained from the dissolution of NaOH:

0.269kJ * (1mol NaOH / 44.3kJ) = 0.00607 moles of NaOH are required

In grams -Molar mass NaOH: 40g/mol-:

0.00607 moles NaOH * (40g / mol) =

The new volume of the balloon : V₂ = 4.89 L

Given

V₁ = 4.96 L

T₁ = 6 + 273 = 279 K

T₂ = 2 + 273 = 275 K

Required

The new volume

Solution

Charles's Law  

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]

Input the value :

V₂=V₁.T₂/T₁

V₂ = 4.96 x 275 / 279

V₂ = 4.89 L

Answer:

% = 33.83%

Explanation:

To do a better understanding of this, we can treat the mixture of the combustion as two separate reactions, in that way, we can have an idea of what is happening and how to calculate the mass percent.

So the combustion reactions in this mixture are:

2C₂H₆ + 7O₂ ---------> 4CO₂ + 6H₂O

C₃H₈ + 5O₂ ----------> 3CO₂ + 4H₂O

Now that we have both reactions (And balanced) we can hace an idea of the mole ratio between every compound in the mix.

For practical purposes, let's call "a" the mass of ethane, and "b" the mass of propane. The innitial mix have 9.725 g, so this means that:

a + b = 9.725 g    (1)

Now that we have this, we can write a relation between the moles of oxygen and the moles of the gases. If we have 1.115 moles of oxygen, and also know the mole ratio of oxygen to "a" and "b", so:

moles O₂ = moles a (moles O₂/moles a) + moles b (moles O₂/moles b)   (2)

And we know that moles a and moles b are:

moles a = a / MW

moles b = b / MW

The MW of a is 30 g/mol and the MW of b is 44 g/mol

Replacing the given data we have:

1.115 moles O₂ = (a/30)(7 moles O₂/2 moles a) + (b/44)(5 moles O₂/1 mole b)

1.115 moles O₂ = (0.1167a) moles O₂ + (0.1136b) moles O₂

To keep solving this, we can use expression (1) to solve for b, and then, replace here and have only one equation with 1 incognite:

a + b = 9.725 g  

b = 9.725 - a   (3)

Replacing above we have:

1.115 = 0.1167a + 0.1136(9.725 - a)

1.115 = 0.1167a + (1.1048 - 0.1136a)

1.115 - 1.1048 = 0.1167a - 0.1136a

0.0102 = 0.0031a

a = 3.29 g

Now, that we have the mass of the ethane, we can calculate the mass percent:

% = (3.29 / 9.725) * 100

Hope this helps

Answer:

Explanation:

Entropy is the measure of randomness of a system . When heat is added to a gas , gas molecules become more random and therefore , their entropy increases . Hence at higher temperature , entropy increases and randomness increases due to addition of heat .

Hence when a gas molecules become more ordered that means entropy decreases . Hence heat is withdrawn from the system . Hence temperature of the system is decreases .

In the given case , gas molecules are made more ordered that means their temperature is decreased to lower the  entropy before they are exhausted .

Answer:

absorbs shock

Explanation:

Answer: absorbs shock

Explanation:

Answer:

a

b

d

c

Explanation:

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Answer: B) Electronegativity is the attraction an element's nucleus has for the electrons in a chemical bond

Explanation:

Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself.

When the size of an atom decreases as we move across the period, as the electrons get added to the same shell and the nuclear charge keeps on increasing. Thus the electrons get more tightly held by the nucleus.

As, the size of an element decreases, the valence electrons come near to the nucleus. So, the attraction between the nucleus and the shared pair of electrons increases and thus the electronegativity increases.

Answer:

42556.5 J

Explanation:

THIS IS THE COMPLETE QUESTION BELOW;

A mixture of krypton and neon gas is compressed from a volume of 96.0L to a volume of 68.0L , while the pressure is held constant at 15.0atm . Calculate the work done on the gas mixture. Be sure your answer has the correct sign (positive or negative) and the correct number of significant digits.

The workdone on the gas can be calculated using below expresion,

W = - PΔV

Where P= Pressure of the mixture of the given gases

ΔV = Change in volume

Given;

Initial volume of the mixture= 96.0L

= 96.0L/ 1000= 0.096m³

Final volume of the mixture= 68.0L

= 68.0L/1000= 0.068m³

Pressure= 15.0atm, but we need to convert to N/m² for unit consistency.

1 atm= 101325 N/m²

15 atm = X

Cross multiply

X = (15×101325 )

X= 1519875 N/m²

P= 1519875 N/m²

W = - PΔV

W= - 1519875 × (0.068 - 0.096)

= - 1519875 × -0.028 m³

W= 42556.5 J