1. How does wind help in the following activities?
(a) Flying a kite
(b) Moving a sailboat​

Answer:

D

Explanation:

Most if not all fields of research will post their results for others to test and find data to make sure their experiment is theoretically correct.

Scientific journals are the first repost of new scientific discoveries published. Hence, option D is correct.

Scientific papers are also called journal articles, A scientific journal is the best medium for disseminating and popularizing scientific information in the form of accomplishments, discoveries, and research findings.

In order to publish this kind of work, they are typically published in a periodical called a journal.

Thus, option D is correct.

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The temperature 12.17º C rounded to three significant figures is 12.2º C, taking into account the fourth figure which is a 7. This causes an upward rounding due to the rule of significant figures.

To round off the temperature of 12.17º C to three significant figures, we look at the fourth figure which is a 7. Since 7 is greater than 5, we round the third significant figure up, which results in a rounded temperature of 12.2º C.

In the context of rounding based on significant figures, the temperature value is often dependent on the least precise measurement in a data set or calculation. As an example, if we had another measurement of 13.7 kg, which is to the 0.1 decimal place, any resultant calculation would need to be rounded to the tenths place for consistency, giving us a hypothetical final answer of 15.2 kg, to match the precision of 13.7 kg.

The correct answer is D. 396 kJ. ΔG will be negative for this value of TΔS indicating a spontaneous reaction.

Further Explanation:

A. -198 kJ FALSE because this gives a positive ΔG.

[tex]dG \ = \ 198 \ kJ \ - \ (-198 \ kJ) \\\boxed {dG = 396 \ kJ}[/tex]

B. 198 kJ FALSE because this results in ΔG = 0. The reaction is at equilibrium.

[tex]dG \ = \ 198 \ kJ \ - \ 198 \ kJ \\\boxed {dG = 0}[/tex]

C. 0 kJ FALSE because this results in a positive ΔG.

[tex]dG = 198 \ kJ \ - \ 0\\\boxed {dG = 198 \ kJ}[/tex]

D. 396 kJ TRUE because this results in a negative ΔG.

[tex]dG = \ 198 \ kJ \ - \ 396 \ kJ\\\boxed {dG = -198 \ kJ}[/tex]

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Keywords: Gibbs Free Energy, spontaneity

Answer:

B

Explanation:

If the concentration is increased, there are more particles to collide with each other, increasing the rate of the reaction.

The concentration of reactants affect the rate of a reaction by increasing the concentration increasing the collision of molecular frequency.

The reaction rate refers to how quickly the concentration of such a particular reactant as well as product changes during a chemical reaction.

The abundance of an ingredient divided by the volume of a combination is called concentration. Mass concentration, molar concentration, number concentration, as well as volume concentration are all examples of mathematical descriptions.

The concentration of reactants affect the rate of a reaction by increasing the concentration increasing the collision of molecular frequency.

Therefore, the correct answer will be option B

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First we look at the chemical reaction:

2 Na + Br₂ → 2 NaBr

number of moles = mass / molecular weight

mass = number of moles × molecular weight

number of moles of Na = 1000 / 23 = 43.48 moles

number of moles of Br₂ = 3000 / 160 = 18.75 moles

from the reaction:

if        2 moles of Na are reacting with 1 mole of Br₂

then   X moles of Na are reacting with 18.75 moles of Br₂

X = (18.75 × 2) / 1 = 37.5 moles of Na

The limiting reactant is bromine Br₂.

After the reaction is complete you remain with Na as excess reagent.

moles of Na = 43.48 - 37.5 = 5.98 moles

mass of Na =  5.98 × 23 = 137.54 g

if        reacting 1 mole of Br₂  produces 2 moles of NaBr

then  reacting 18.75 moles of Br₂  produces Y moles of NaBr

Y  = (18.75 × 2) / 1 = 37.5 moles of NaBr

mass of NaBr = 37.5 × 103 = 3862.5 g

Answer:

Explanation:

Given parameters:

Mass of Na = 1kg = 1000g

Mass of Br = 3kg = 3000g

Unkown:

Limiting reagent =?

Amount of excess reagent = ?

Quantity of NaBr formed = ?

Solution

The reaction equation can be expressed as:

                 2Na + Br₂ → 2NaBr

To find the limiting reagent

The limiting reagent is the reagent that is in short supply and it determines the amount of products that can be formed in the reaction.

To find the limiting the reagent, we establish a mole relationship between the reactants. We then check their stoichoimetric expression to see the one in excess and the limiting reagent.

Number of moles of Na = [tex]\frac{mass of Na}{molar mass of Na}[/tex]

   molar mass is expressed as g/mol and the Na should also be in grams

Number of moles = [tex]\frac{1000}{23}[/tex] = 43.48mol

Number of moles of Br₂ =  [tex]\frac{mass}{molar mass}[/tex]

    Number of moles = [tex]\frac{3000}{2x80}[/tex] = 18.75mol

From the balanced reaction equation:

     2 mole of Na combines with 1 mole of Br₂

     43.48mole of Na would require 43.48/2 mole = 21.74mole of Br₂ to react with.

But the given amount of Br we have is 18.75mole.

Therefore, the reagent in short supply is Bromine. It is the limiting reagent

Quantity of NaBr formed

To find the quantity of NaBr formed, we use the known reagent which is the limiting one to determine its number of moles and eventually the mass. The limiting reagent determines the extent of the reaction.

 From the stoichiometric equation:

          1 mole of Br₂ will produce 2 mole of NaBr

  19.23 mole Br₂ would now yield  (18.75 x2)= 37.5mole  of NaBr

Mass of NaBr = number of moles of NaBr x molar mass of NaBr

Molar mass of NaBr = 23 + 80 = 103g/mol

      Mass of NaBr = 37.5 x 103 = 3862.5g = 3.86Kg

Amount of excess reagent remaining after the complete reaction:

The amount of excess reagent would be derived from the reagent that occurs in excess which is Na:

1 mole of Br₂ reacts with 2 moles of Na

18.75mole of Br₂  will require 2x 18.75 = 37.5mole of Na

Excess mole of Na = (43.48 - 37.5)mole = 5.98mole

Mass of excess Na = number of moles of excess Na x molar mass of Na

Mass of excess Na = 5.98 x 23

Mass of excess Na = 137.54g or 0.14g

Answer:

-65.897°C.

Explanation:

where, ΔTf is the depression in freezing point of chloroform solution.

Kf is the molal depression constant of chloroform (Kf = 4.70°C.kg/mol).

m is the molality of the solution (m = 0.51 m).

∴ ΔTf = Kf.m = (4.70°C.kg/mol)(0.51 m) = 2.397°C.

∴ The freezing point of the solution = (freezing point of chloroform) - ΔTf = (-63.5°C) - (2.397°C) = -65.897°C.

Answer:

-65.9 and 100.9

Explanation:

Hope this helps

Answer:

0.193 M to the nearest thousandth.

Explanation:

Molar mass of copper (ii) chloride

= 63.546 + 2* 35.45

= 134.446 g.

So in 2.60L of 1  M solution  there is 134.446 * 2.6

= 349.56 g of copper chloride.

So the molarity of our solution is  67.3 / 349.56

= 0.193 M.

Answer:

Polar

Explanation:

water is a polar solvent since they can ionize into positive (H+) and negative ions (OH-). they can dissociate into negatively and positively charged poles

Answer:

2SO2 + 02 ====>2SO3

Explanation:

SO2 + O2 ===> SO3

The only thing you can do is balance the oxygens that are on the sulfurs. When you do that the oxygen (O2) can make the difference.

SO2 + O2 ===> 2SO3

Bring the oxygen on the right up to 6. When you do that, the sulfurs are out of balance. So balance the sulfurs.

2SO2 + 02 ====>2SO3

Your equation is now balanced. The trick is not to leave the number of oxygens on the right as an odd number. When you fix that problem, the equation will balance easily.

Species           S                 O

Left                  2                  2+4=6

Right                2                  2*3 =6

Balanced.

A. Two electrodes separated by an electrolyte that can generate an electrical current.

Answer:

Two electrodes separated by an electrolyte that can generate an electrical current.

Explanation:

Answer via Educere/ Founder's Education

Answer:

D, ABC, C, A, ?, B, A, ?, B, C, D, D, C, D

Explanation:

(Answers and explanations in order of questions)

Fission reactions are when the nucleus of an atom splits producing smaller nuclei and energy

Lack of space isn't a safety risk

Coal, natural gases, and oil all are burned to create energy which releases carbon into the atmosphere, polluting it. Nuclear power doesn't burn carbon-based substances and so is fine

I dunno but C and D are wrong

All of them are technically renewable?

Geothermal energy uses the Earth's heat, hence the name

Nothing can happen if people ignore it

Unsure

Synthetic polymers are plastics, which do not decay naturally

A base would react with the acid to neutralise it which is the fastest way to improve the lake

Not pesticides?

Oil spills kill aquatic animals and life quickly, which causes huge damage to ecosystems

If nothing changes nonrenewable things will run out and bad practices will have caused irreparable damage worldwide

Big factories are pumping out the bad stuff

Answer:

1)D) Fission is the process when the nucleus of an atom splits after being bombarded by neutrinos.

2)A) Storage and disposal of radioactive waste is a problem all nuclear power plants face. Most of them dipose the waste underneath the ground. There have even been proposals to send the nuclear waste to the moon.

3)C) Nuclear Power because it does not produce greenhouse gas emissions.

4)A) Oil is more difficult to remove from the Earth than coal This is why, to extract oil, you need an extraction pump and other equipment, while coal can be removed from the earth after digging.

5)A) biofuel - because it comes from agriculture, and agriculture is the biggest contributor to worldwide greenhouse emissions.

6)B) Geothermal power - geothermal power uses the heat from the earth to produce energy.

7)D) - Humans have seemingly unlimited needs and these needs have to be met without destroying the enviroment.

8)C) Xenon - The other three substances listed are classified as Ozone depleting susbstances according to the Ministry of the Enviroment in New Zealand.

9)B) Synthetic materials often do not decay naturally - The best example is plastic, which is a synthetic material that takes hundreds or even thousands of years to decay.

10)C) An environmentally safe base to neutralize the lake - This can be done by oxygenizing the lake.

11)D) Oil spills - Unfortunely, these events have taken place many times. The oil spill in the Gulf of Mexico caused by British Petroleum greatly affected the coasts and waters of Louisiana.

12)D) The whole ecosystem is negatively affected, and long-term damage may occur - An oil spills afects aquatic plants, animals, birds, and the water itself.

13)B) Natural resources will be depleted - Oil might even run out completely. Besides, climate change would raise the sea levels and flood thousands of cities.

14)D) factories and power plants - especially thermal power plants that burn coal to produce energies.

Answer:

31557600 seconds in a year or 3.1557600 * 10^7 in scientific notation

Answer:

Don't know. But need the answer

Explanation:

Answer:

The correct answer is Cirrocumulus.

Explanation:

Cirrocumulus : Clouds forming broken layer of small fleecy clouds at higher altitudes.

Cumulonimbus  : Clouds forming a towering mass with flat base with flat base at lower altitude

Cumulus  : Cloud forming rounded masses heaped or stacked on each other above a flat base , fairly at lower altitudes.

Stratus : Clouds forming continuous horizontal gray sheet, usually during rain or snow.

The given image corresponds to description given as Cirrocumulus.

Answer: A

Explanation:

Answer:

B. High temp and low pressure

Explanation:

I got an A on my chem final :) Got this right.

Answer:

A gas is most likely to exist at B) High temperatures and low pressures

Explanation:

Ideal gas behaviour is likely to be at high temperature and low pressure .

The causes of deviations from ideal behaviour may be due to the following two assumptions of kinetic theory of gases.  

The volume occupied by gas molecules is negligibly small as compared to the volume occupied by the gas.

The forces of attraction between gas molecules are negligible.

Deviation occur for real gases with a minor difference from that of an Ideal gas.

When real gases are at low pressures and high temperatures they behave close enough to ideal gases

Sulfur hexafluoride or SF6 is an inorganic, greenhouse gas. It is non-flammable, odorless, and colorless, and is an excellent insulator. It is a hypervalent octahedral molecule that has been an interesting topic of conversation among chemistry enthusiasts.

Hope this helps:)

SF₆ has six covalent bonds created by sp³ d² hybridization of the sulfur atom, forming a symmetrical octahedral structure with low reactivity.

The type of bond in SF₆ (sulfur hexafluoride) is a covalent bond. Specifically, the sulfur atom undergoes sp³ d² hybridization, allowing it to form six equivalent bonding pairs with the fluorine atoms. These bonds exhibit both sigma (σ) and pi (π) characteristics, as the S-F bond length is short, which is consistent with π-bonding in addition to σ-bonding.

This indicates that there are no lone pairs of electrons on the sulfur atom. The geometry displayed by SF₆ is highly symmetrical, forming an octahedron where all bond lengths and angles are identical, making it a nonpolar molecule with high symmetry and low reactivity. SF₆ is resistant to chemical attack and exhibits inert characteristics, which makes it useful in applications such as a spark suppressor.

Answer:

Explanation:

Heat = m*c * deltat

m = 20 grams

c = 4.19 J/g*C

deltaT = 30 - 10 = 20

Heat = 20 * 4.19 * 20

Heat = 1676 joules or 1.7 kJ depending on what you need.

Answer:

The correct answer for plato/edmentum is C). 1700 joules

Answer:

Ion dipole force.

Explanation:

When sodium chloride is dissolved in water it dissociates into sodium ion and chloride ion.

Sodium ion has positive charge on it.

Chloride ion has negative charge on it.

In water molecule, due to electronegativity difference, hydrogen acquires a slightly positive charge and oxygen a slightly negative charge.

This creates a dipole in water molecule.

Now the force of attraction between water and NaCl is in between the ions and the dipole.

Thus the strongest intermolecular force of attraction between NaCl and water is Ion-dipole.

Answer:

2RbNO₃ + BeF₂ → Be(NO₃)₂ + 2RbF, because Be keeps a 2+ charge throughout the reaction

Explanation:

2RbNO₃ + BeF₂ → Be(NO₃)₂ + 2RbF, because Be keeps a 2+ charge throughout the reaction

Rb is a +1 cation, NO3 is a -1 anion, Be is a +2 cation and F is a -1 anion.

In writing an ionic compound the charge of the cation becomes the subscript of the anion and the charge of the anion becomes the subscript of the cation.  

So the ionic compound formed between Be2+ and F- is BeF2. The ionic compound formed between Be2+ and NO3- is Be(NO₃)₂.  

As there are two NO₃ on the product side it is balanced by writing a 2 coefficient before RbNO₃ on the reactant side.  

And as there are two F on the reactant side it is balanced by writing a 2 coefficient before RbF on the product side.  

Answer:

2RbNO3 + BeF2 → Be(NO3)2 + 2RbF, because Be keeps a 2+ charge throughout the reaction

Answer:

This would support Dalton's postulates that proposed the atoms are indivisible because no small particles are involved.

Explanation:

Experiment using the gas discharge tube by J.J Thomson led to the discovery of cathode rays which are now known as electrons.

Primarily, Thomson's experiment led to the discovery of cathode rays, electrons, as subatomic particles.

If the size of the atoms observed at the cathode is the same as that of the rays,we can conclude that the particles of the rays are the simplest form of matter we can have. This would suggest that the atom is indeed the smallest indivisible particle of a matter according to Dalton.

Answer:

This would support Dalton's postulates that proposed the atoms are indivisible because no small particles are involved.

Explanation:

Dalton proposed that all matter is made up of atoms. Atoms are indivisible. But Thompson’s cathode ray experiment proved that the cathode rays are made up of negatively charged particles which were deflected by both electric and magnetic field. This caused Thompson to propose the Plum and Pudding model of the atom.

Answer:

8856joules

Explanation:

Energy= MC. ©

energy = 123.00*1*(97-25)

energy =8856joules//

Answer: The amount of energy required will be 8856 Joules.

Explanation:

To calculate the amount of heat absorbed, we use the equation:

[tex]Q=mc\Delta T[/tex]

where,

Q = heat absorbed or released

m = Mass of the substance = 123 kg

c = specific heat capacity of water = [tex]1J/kg.K[/tex]

[tex]\Delta T[/tex] = change in temperature = [tex](97-25)^oC=72^oC=72K[/tex]  (change remains the same)

Putting values in above equation, we get:

[tex]Q=123kg\times 1J/kg.K\times 72K\\\\Q=8856J[/tex]

Hence, the amount of energy required will be 8856 Joules.

Answer:

=384.48°C

Explanation:

Change in enthalpy  is negative because heat energy is lost to the surroundings.

Change in enthalpy= mass ×specific heat capacity× Change in temperature.

ΔH=MC∅

m=14grams

C of iron= 0.45 J/g°C

∅=?

186.0J= 14.0g × 0.45J/g°C×∅

186=6.3∅

∅=29.5°C

Final temperature= 414.0°C - 29.52°C

=384.48°C

Explanation:

The total mass is:

100 g + 200 g

= 300 g

The mass of salt is:

0.20 (100 g) + 0.10 (200 g)

= 20 g + 20 g

= 40 g

So the concentration is:

40 g / 300 g

≈ 13.33%

Round as needed.

Answer:

False

Explanation:

All Arrhenius acids and bases are also Bronsted-Lowry acids and bases.

An Arrhenius base is a compound that dissociates to form hydroxide ions in water.

NaOH(s) → Na^+(aq) +OH^-(aq)

A Bronsted-Lowry base is a proton acceptor.

NaOH is a Bronsted-Lowry base because the hydroxide on can accept a proton from HCl to form water.

Thus, all Arrhenius bases are Bronsted-Lowry bases.

Answer:

False

Explanation:

Compounds are chemically combined

lemonade is not

If the squeezed lemonade is made by squeezing lemons to extract the juice and mixing it with water and sugar, it would be a homogenous mixture.

If it contains a pulp than it would be heterogeneous

Answer:

green

Explanation:

Answer:

The answer is Green

Explanation:

I've just answered this on usatestprep.

Answer:

a triangle

Explanation:

the name "triangular prism" has triangle in it, just like "rectangular prism" which has a rectangle as a base

Answer:

It’s actually DFG

Explanation:

DFBA

Answer:

molecules

Explanation:

molecules because the summer like atoms and Sciences sciency to be honest

Answer:

10 electrons 8 protons

Explanation:

p +8 - e10- equals -2

Answer:

The ideal gas equation

Explanation:

The ideal gas equation is derived from the combination of three gas laws:

The ideal gas law is expressed mathematically as: PV=nRT where:

P is pressure

V is volume

n is the number of moles

R is the ideal gas law

T is temperature.

To obtain the combined gas law, we assume that n=1 and this gives:

                       [tex]\frac{PV}{T}[/tex] = R

Therefore:

[tex]\frac{P_{1} V_{1} }{T_{1} }[/tex] = [tex]\frac{P_{2} V_{2} }{T_{2} }[/tex]