A force of 450 N accelerates a box across a frictionless surface at a rate of 15 m/s2. What is the mass of the box?

30 kg
6,750 kg
6,750 N
30 N

The significance of the even number of protons and neutrons, in this case, is that it gives stability to the nucleus of an atom.

Protons are the positively-charged sub-atomic particle found in the nucleus of an atom. Protons are responsible for the mass of the atom of an element.

Protons exert a positive attractive force on the electrons found in orbitals around the atom.

Neutrons are neutral particles that are found together with the protons in the nucleus of an atom.

Neutrons together with protons account for the mass of an atom. Although neutrons are neutral, they contribute to the strong nuclear force that holds the nucleus of an atom together.

The correct ratio of protons and neutrons in the nucleus of an atom is required for the stability of the nucleus of an atom.

When the ratio of the protons and neutrons increases above 1 : 1.5, the nucleus of the atom becomes unstable.

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Answer:

The forelimbs of a bat are different from other mammals as they are modified into wings for the purpose of flying.

The addition of \(O_2(g)\) will shift the equilibrium towards the right side of the reaction and will consume \(Cl_2(g)\).

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Answer:

Q = 6583.5 J

Explanation:

Given data:

Heat required = ?

Mass of water = 35 g

Initial temperature = 50°C

Final temperature = 95°C

Solution:

Specific heat capacity of water is 4.18 j/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT  = 95°C - 50°C

ΔT  = 45°C

Q = 35 g×4.18 j/g.°C × 45°C

Q = 6583.5 J

Answer:

1. 179.2 L

2. 303.62 g

Explanation:

1. Determination of volume of H₂O (g).

We'll begin by calculating the number of mole in 144 g of H₂O. This is illustrated below:

Mass of H₂O = 144 g

Molar mass of H₂O = (2×1) + 16 = 2 + 16 = 18 g/mol

Mole of H₂O =?

Mole = mass /Molar mass

Mole of H₂O = 144/18

Mole of H₂O = 8 moles

Finally, we shall determine volume of H₂O (g) as follow:

1 mole of any gas occupy 22.4L at stp.

Therefore, 8 moles of H₂O (g) will occupy =

8 × 22.4 = 179.2 L

Thus, 144 g of H₂O (g) occupies 179.2 L

2. Determination of the mass of H₂O₂ (g).

We'll begin by calculating the number of mole of H₂O₂ (g) that occupied 200 L at STP. this can be obtained as follow:

1 mole of any gas occupy 22.4 L at stp.

Therefore, Xmol of H₂O₂ (g) will occupy 200 L at STP i.e

Xmol of H₂O₂ (g) = 200/22.4

Xmol of H₂O₂ (g) = 8.93 moles

Thus, 8.93 moles of H₂O₂ (g) occupied 200 L at STP.

Finally, we shall determine the mass of H₂O₂ (g) as follow:

Mole of H₂O₂ (g) = 8.93 moles

Molar mass of H₂O₂ = (2×1) + (2×16) = 2 + 32 = 34 g/mol

Mass of H₂O₂ =?

Mole = mass /Molar mass

8.93 = mass of H₂O₂ /34

Cross multiply

Mass of H₂O₂ = 8.93 × 34

Mass of H₂O₂ = 303.62 g

Answer:

Isothermal compressibility is different from isentropic compressibility by temperature instead of entropy.

Explanation:

Isothermal compressibility refers to that type of compressibility where volume change takes place at constant temperature whereas isentropic compressibility refers to that in which volume change takes place at constant entropy. Entropy is the measure of a thermal energy of the system per unit temperature that is unavailable for doing useful work.

Answer:Gases and solids , Solids and liquids​

Explanation:

A solid has a definite shape while liquids and gases take the shape of the container in which they are found .

Hence when a substance changes it's state from gas to solid or solid to liquid, it's shape automatically changes as explained above.

I think correct answer is C.Jet stream would be displaced southwards causing heavy rain and flooding

The statement that is a likely impact of stronger than normal trade winds in the Pacific Northwest to the United States is Jet stream would be displaced southwards causing heavy rain and flooding.

Using the dilution formula, the volume of stock required is 54 mL and is made up to 200 mL to give 0.1 g/L NaCl solution.

To prepare dilute solutions from stock solutions, the dilution formula is used to calculate the volume of stock solution required in order to prepare the dilute solution.

The dilution formula is given below:

M₁V₁ = M₂V₂

where;

From the data provided:

M₁ = 0.369 g/L

V₁ = ?

M₂ = 0.1 g/L

V₂ = 200 mL

V₁ = M₂V₂/M₁

V₁= 200 * 0.1/0.369

V₁ = 54 mL

Therefore, 54 mL f the stock solution is measured into a volumetric flask and diluted with water to  volume of 200 mL.

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Answer:

1 - NO2 at 339 K

2 - Ne at 371 K

3 - H2 at 371 K

4 - H2 at 425 K

Explanation:

Kinetic Energy is directly related to temperature; the higher the temperature the higher the kinetic energy. Kinetic energy is also equal to 12m⋅v2, so if we want a high velocity we want high temp and low mass. So let's list out approximate masses:

m(H2)≈2

m(NO2)≈46

m(Ne)≈20

So we have NO2 at 339 K, the lowest temperature out of the mix, and the highest mass out of the mix, so this is moving the slowest.

In contrast, we have H2 at 425 K, the highest temperature out of the mix, and the lowest mass out of the mix, so this is moving the fastest.

Now we have Ne and H2 at 371 K, since they are at the same temperature they have the same kinetic energy. But H2 is lighter than Ne so it must be faster. To quantify this mathematically, let's assume (this is wrong but just as an assumption for an example) KE at 371 K is 100:

100=12⋅m⋅v2

200=m⋅v2

√200m=v

So H2 is about v=10 and Ne is about v=√10≈3

So the order to recap is:

1 - NO2 at 339 K

2 - Ne at 371 K

3 - H2 at 371 K

4 - H2 at 425 K

Hope that makes it clearer!

Answer:  28.2 g of ²⁶Mg can be isolated from the 9.87 mole sample of natural magnesium

Explanation:

we know that natural abundance of ²⁶Mg is 11.01 %

therefore moles of ²⁶Mg isolated from 9.87 mole sample of natural magnesium will be :

( 11.01 x 9.87 mol) / 100  = 1.09 mol

so

mass of ²⁶Mg = mol x molar mass

⇒ 1.09 mol x 25.9826 g/mol

= 28.2 g

Therefore 28.2 g of ²⁶Mg can be isolated from the 9.87 mole sample of natural magnesium

Answer:

an oxygen ion with -2 charge

Explanation:

because a neutral oxygen atom has 8 electrons

and in the first orbit there'll be 2 electrons

and in the second orbit there'll be 6 electrons

but here there are 8 electrons in the outermost orbit and normally there'll be only 6

which means there are extra 2 electrons

and extra electrons means negatively charged

Answer:

There are 16 protons, 18 electrons and 16 neutrons. I hope this helped:)

306.178 liters is the volume of O2 at STP, required for the complete combustion of 125g octane (\(C_{8}H_{18}\)) to \(CO_{2}\) and H20

To calculate the volume of \(O_{2}\) required for the complete combustion of octane (\(C_{8}H_{18}\)) to \(CO_{2}\) and \(H_{2}O\) at STP (Standard Temperature and Pressure), we need to consider the stoichiometry of the balanced chemical equation.

The balanced equation for the combustion of octane is:

\(C_{8}H_{18}\) + 12.5\(O_{2}\) -> 8\(CO_{2}\) + 9\(H_{2}O\)

From the equation, we can see that 1 mole of octane requires 12.5 moles of \(O_{2}\) to completely combust. The molar mass of octane (\(C_{3}H_{18}\)) is approximately 114.22 g/mol.

To calculate the moles of octane, we divide the given mass by the molar mass:

Moles of octane = 125 g / 114.22 g/mol ≈ 1.093 mol

Since the molar ratio between octane and \(O_{2}\) is 1:12.5, the moles of \(O_{2}\)required can be calculated as:

Moles of \(O_{2}\) = 1.093 mol * 12.5 ≈ 13.663 mol

Now, we can use the ideal gas law, PV = nRT, to calculate the volume of \(O_{2}\) at STP. At STP, the temperature is 273 K, and the pressure is 1 atm.

Using the molar volume of an ideal gas at STP (22.4 L/mol), the volume of \(O_{2}\) required is:

Volume of \(O_{2}\) = Moles of \(O_{2}\) * Molar volume = 13.663 mol * 22.4 L/mol ≈ 306.178 L

Therefore, approximately 306.178 liters of \(O_{2}\) at STP would be required for the complete combustion of 125 grams of octane (\(C_{8}H_{18}\)) to \(CO_{2}\) and \(H_{2}O\)

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Storms are disturbances in atmospheric conditions. The four severe storms are thunderstorms, lightning, heavy rain, and blizzards.

Blizzards are the type of storm that includes high wind at 40 km/h and also have snow and cold air that makes the temperature drop and causes poor visibility.

Thunderstorms and lightning occur with high electrical charge release during high wind and rain. Heavy rains are severe types of storms as they can cause a flood.

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No, The formula CuO2 is for copper super peroxide

The formula of copper peroxide is Cu2H2O2

The concentration of HBr used in the titration is found to be 0.0978M.

Volume of NaOH used is 27.50ml and it’s molarity used is 0.200M.

Volume of HBr used is 56.20ml.

On comparing molarity of both the solutions, we get the relation

HBr × VHbr  = MNaOH × VNaOH

MHBr = 0.200M × 27.50ml /56.20ml

MHBr = 0.0978M.

A colorless, stifling gas called hydrogen bromide is highly dissociated in water and exceedingly soluble in water. In the presence of damp air, it rapidly fumes. Hydrogen bromide gas is a very caustic chemical that, when contacted, can result in serious burns.

To determine the concentration of an identified analyte, titration is a typical laboratory technique for quantitative chemical analysis. A standard solution with a defined concentration and volume is prepared as a reagent, also known as the titrant.

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The most suitable disadvantage of renewable energy is that most sources are expensive to get started. So, from amongst the provided options, option (b) can be regarded as the correct and the most suitable.

Renewable energy is the most suitable and most effective form of energy existing and it can offer many benefits, the initial costs of establishing its setup, the infrastructure and the necessary technologies required for renewable energy generation could be much.

This can make it quite difficult for some individuals in order to implement and use it, businesses, or governments to invest in renewable form energy and may need government compensation and subsidies or incentives to encourage establishment.

But it must be regarded and kept in mind and is noteworthy that the costs of renewable energy have been reducing and declining in recent years and are supposed to continue to be decreasing in the future.

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Answer:How many moles of aluminum are needed to react completely with 1.2 mol of FeO? 2Al(s) + 3FeO(s) = 3Fe(s) + Al2O3(s). 0.8 mols.

Explanation:

Answer:

D. Amphibians require water for reproduction and part of their life cycle. Deserts in Africa have little water and frozen ice in Antarctica reduces the water in which amphibians can lay eggs.

Explanation:

To further explain why is because all amphibians are cold-blooded. Meaning that their temperature is relied on the environment to keep them warm or cool. However, in a desert or in ice it can be either extremely cold or extremely hot, thus making it uninhabitable for amphibians.

Hope this helps!

Amphibians need water for reproduction. Deserts (Africa) have low water and frozen ice in Antarctica reduces the water in which amphibians can lay eggs.

What is the cause of the decline in the global population of amphibians?

Habitat shift

Habitat loss is the primary contributing aspect to amphibian reduction globally with an evaluated 63% of all amphibian species concerned, and as more as 87% of the Threatened species impacted.

So, in a desert or on ice it can be either extremely cold or extremely hot, thus making it uninhabitable for amphibians.

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Answer:

Elements are pure substances which are composed of only one type of atom. Compound are substances which are formed by two or more different types of elements that are united chemically in fixed proportions. ... Some of the examples of elements are Iron, Copper, Gold, etc. A few examples of compounds are NaOH, NaCl, etc.

Answer:

I think it's c

Explanation:

c seems like the best answer

Answer:

C since that has to be correct.

Answer:

747.5 mL

Explanation:

Assuming ideal behaviour, we can solve this problem by using Boyle's law, which states that at constant temperature:

Where in this case:

We input the data given by the problem:

And solve for V₁:

Answer:

\(NCl_3\)

Explanation:

An octet rule is a thumb rule in the chemical sciences in which there is a natural tendency for an atom to prefer eight electrons in the valence shell of the atom. When there are less than eight electrons in the atom, they react with other atoms and form more stable compounds.

In the context, nitrogen trichloride, \(NCl_3\), is an example of molecular compound which obeys the octet rule having a zero formal charges on each atom of the compound.

In virtually every stable compound, each of the atoms has achieved an electron configuration analogous to that of the noble elements.

Noble elements are those which have completely filled orbits, they are highly stable compounds, they do not react under normal conditions.

All the chemical compounds and elements have tendency to be stabilized by achieving the nearest inert electronic configuration.

They are classified as non-metals and they come under p-block elements. They have a complete octet; therefore, their electronic configuration is n\(s^{2}\)n\(p^{6}\),Their ionization enthalpy has a very high value, but xenon can react with highly electronegative atoms like oxygen and fluorine to form corresponding xenon compounds.

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Strong intermolecular forces are a property associated with inorganic compounds

Intermolecular forces determine bulk properties such as the melting points of solid and the boiling points of liquids and inorganic compounds on the other hand tends to have strong intermolecular forces such as hydrogen thus they have higher viscosity and organic compound have relatively high melting and boiling point when compared to inorganic compound that generally have a low melting and boiling points

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Answer:

They are plants also known as plankton and they produce about 80-85% of the world's oxygen.

Explanation: