help me plss ty in advanced​

Answer:

A- how long ago a plant or animal lived

Fresh water pollutants  are substances which pollute fresh water and  industrial waste, is most harmful fresh water pollutant to man and aquatic organisms.

Pollutants are substances which cause harm when they are present in the environment.

Pollutants include chemicals such as petroleum and material such as sewage.

The presence of pollutants in freshwater results in water pollution and make the water unfit for drinking purposes and also harms aquatic life in freshwaters.

Some freshwater pollutants include:

Of these pollutants, the most dangerous fresh water pollutant is industrial wastes as they kill aquatic organisms most due to the presence of harmful chemicals in them.

Therefore, fresh water pollutants such as industrial waste is most harmful to man and aquatic organisms.

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Answer:

Explanation:

Part (c)

Mix together two suitable solutions.

Use filtration to separate the precipitate as a residue from the solution.

Wash the precipitate with distilled water while it is in the filter funnel.

Leave the washed precipitate aside or in a warm oven to dry.

Part (d)

Pb(NO3)2 (aq) + Na2SO4 (aq) → 2 NaNO3 (aq) + PbSO4 (s)

Answer:

The biggest risk with recharging alkaline batteries is leakage. As you probably know, alkaline batteries leak even under normal circumstances. Internal off gassing, made worse by heat, creates pressure that can breach battery seals. Therefore, the risk of leakage is an even bigger risk when recharging.

Answer:

Temp decreased

Explanation:

If the container is sealed and the pressure DEcreases, then the temperature DEcreased

PV = n RT     n  R   V   are constant   if  P goes down then so does T    

In 1867, Otto von Bismarck created the Northern Confederation, a combination of the northernmost German states beneath Prussian rule.

The "Iron Chancellor," Otto von Bismarck (1815–1898), oversaw the unification and modernization of Germany. He virtually ruled Prussia and then all of Germany between 1862 until 1890. To unify the 39 autonomous German states under Prussian control, great strategist Bismarck launched decisive wars with France, Austria, & Denmark.

In 1864, Bismarck began the series of wars that'd make Prussia the most powerful country in Europe. He invaded Denmark to seize control of the German-speaking province of Schleswig-Holstein, and two years later he persuaded Emperor Franz-Josef I to start the Austria- War (1866), which brought about an immediate defeat for the faltering Austrian empire.

Thus, on 1867, Otto von Bismarck created the Northern Confederation, a combination of the northernmost German states beneath Prussian rule.

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Answer:

I think I answered this already but I'll put it again:

The cathode reaction is NiO2+H2O+2e−→Ni(OH)2+2OH−.

Answer:

1) Use a stronger battery

Explanation:

I'm going to quote Northeastern University (I could try to type out an explanation but this will probably be more concise)

"Electromagnets are made of coils of wire with electricity passing through them. Moving charges create magnetic fields, so when the coils of wire in an electromagnet have an electric current passing through them, the coils behave like a magnet."

4) So, if the coils are creating a moving charge, and there are more coils, each coil will be "setting up" its own magnetic field.  This means that less coils will make the electromagnet weaker

2) Because it is an electromagnet, a plastic nail is not going to produce the same effect. An electromagnet is picking up metal, and it is not picking up plastic. This is because plastic (a material with low permeability) does not have a magnetic field that is able to interact with a magnet.

[Permeability is a measure of how easily magnetic lines of force can pass through a material.]

3) There's not really a point that I can imagine of gluing the wire to the nail. Glue would put more distance between the nail and the magnet than nothing being there at all.

1) More voltage in a battery produces a larger current in the wire. This means that the strength of an electromagnet is affected by the voltage/strength of the battery. So, a stronger battery would make the electromagnet stronger, and a weaker battery would make the electromagnet weaker.

The electromagnet works, and he's able to pick up metal objects with it, he does to make it stronger  to use a stronger battery. Therefore, option 1 is correct.

An electromagnet is a type of magnet where an electric current creates the magnetic field. The wire that makes up an electromagnet is typically twisted into a coil. A magnetic field is produced by a current flowing through the wire and is concentrated in the hole in the center of the coil.

Electrical devices including motors, generators, speakers, computers, and MRI machines cannot be built without electromagnets. They are well known for their ability to lift and move heavy magnetic objects, such as scrap iron.

Many electromagnets have an advantage over permanent magnets because they can be easily turned on and off, and increasing or decreasing the amount of electricity flowing around the core can control their strength.

Thus, option 1 is correct.

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Answer:

When an atom loses an electron it becomes ionized

The type of triangle that is created by the three cities is an obtuse triangle, because 22 + 51 > 54.

Obtuse triangle is a type of triangle in which any of its angle is greater than 90 degrees, and the sum of the interior angles must by equal to 180 degrees.

Considering length AB and AC = 22 miles + 51 miles = 73 miles

The sum of length AB and AC is greater than length BC, and the opposite angle of side BC is greater than 90 degrees.

Thus, the type of triangle that is created by the three cities is an obtuse triangle, because 22 + 51 > 54.

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Answer:

See explanation.

Explanation:

This isn't chemistry. Its physics. Kinetic energy (water) to electric energy (dam) as the hydroelectric dam works. Then, as the current travels from the plant to your crib, electric energy to heat energy (wire resistance). Then when you are using the dryer electric energy to heat energy (hot air) and sound energy (air particles vibrate due to the heat energy).

The planet that scientists believe prevented the asteroids in the asteroid belt from forming a planet is Jupiter.

Asteroids are known to be leftovers from the formation of the solar system for about 4.6 billion years ago.

Why Jupiter prevented asteroids

Therefore, Jupiter made asteroids form group of debris, rather than forming a planet.

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The Lewis Structure for ClO.  is attached in the image.

Lewis structure represents the structure of atoms or molecules with their valence electron.

It is a two-dimensional model that helps us to know, how many bond pairs and a lone pair a molecule contains.

Lewis structure of ClO⁻ is very simple to draw as it has only two atoms(chlorine and oxygen), we have to just represent the valence electron around them and complete their octet.

1. Count total valence electron in ClO-

Total number of the valence electrons in chlorine = 7

Total number of the valence electrons in oxygen = 6

Total number of valence electrons  = 7 + 6 + 1 = 14 valence electrons        

[∴one oxygen atom, one chlorine, and one negative charge that count as a one valence electron]

2. Find the least electronegative atom and placed it at center

Connect outer atoms to central atom with a single bond Cl-O bond

Now count the valence electron in the above structure.

Single bond means two-electron , only one single bond is used.

Hence, only 2 valence electrons are used in the above structure from 14 total valence electrons available for drawing the lewis structure of ClO-.

(14 – 2) = 12

We have left with 12 valence electrons more.

3.   Place remaining valence electrons starting from outer atom first

So, put the valence electron around the chlorine and oxygen.

we put 6 electrons around chlorine and oxygen, as each of them already sharing 2 electrons with the help of a single bond between them.

The structure can be seen in the figure attached.

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The compounds with high Intermolecular forces , will result in the highest melting point.

The temperature at which the solid and liquid form of a solvent are in equilibrium and applying any more heat will lead to melting of the solid into liquid is called Melting Point.

The Intermolecular force that would result in highest melting point is the Ion-Ion interaction , the more the bonding the higher will be the melting point.

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An aqueous solution of an arrhenius acid reacts with an aqueous solution of an arrhenius base to produce water and salt.

This is a compound which is formed as a result of a neutralization reaction between acid and base.

Arrhenius acid reacts with an aqueous solution of an arrhenius base to produce water and salt due to increased concentration of H+ and OH- respectively.

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The order of increasing reactivity of the metals is: magnesium, sodium, and potassium.

The reactivity of metals increases as one goes down the group and increases from right to left in th periodic table.

For the three elements, sodium potassium, and Magnesium, the least reactive is magnesium while the most reactive is potassium.

This is because of increase in reactivity based on the properties of the elements.

Therefore, the order of increasing reactivity of the metals is: magnesium, sodium, and potassium.

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Answer:

Gases have the highest kinetic energy, followed by liquids, and then solids.

Explanation:

How does the kinetic energy of solids, liquid, and gases compare ?

Higher kinetic energy causes particles to vibrate or move around faster. Solids have the lowest kinetic energy so vibrate very little.

Liquids have more kinetic energy so particles slide past each other.

Gases have the most kinetic energy so fly around in the air.

Answer:

C

Explanation:

you can relate this with their temprature, more kinetic energy means more movement of molecules. This creates heat which then melts or vaporizes substances. So, as K.E increases a substance will change from solid to liquid and eventually gas.

Answer:

(limonene) particles go from liquid to vapour

diffusion

random movement of particles / particles move anywhere / particles move in all directions

spreading out of particles / intermingling of particles / mixing of particles / particles collide / particles bounce off each

other / particles go all over

(bulk) movement of particles from higher to lower concentration / movement of particles down concentration gradient

The Half-Life of the radioactive sample is 8.1 hours.

The half-life of a radioactive substance is the time taken for half the amount of atoms in the given substance to decay.

12.5 grams remains out of 100 grams of the sample.

This is 1/8 of the original samples.

1/8 of the original sample reperesent three half-lives undergone.

Half-Life of the radioactive sample = 24.3/3 = 8.1 hours

Therefore, the Half-Life of the radioactive sample is 8.1 hours.

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Answer:

analysis organic and inorganic compounds,refine substances and chemicals products

Answer:

new volume = 4.458 Liters

Explanation:

A balloon inflated in a room at 24°c has a volume of 4.00Liters The balloon is heated to a temperature of 58°c.What is the new volume if the pressure remains constant

charles law

volume1/temperature1 = volume2/temperature2

temperature has to be converted to kelvin

temperature 1 = 24+273=297

temperature 2 = 58+273=

4/297 = volume2/331

volume2 = (4*331)/297

volume2 = 4.45791245791 Liters

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Answer:

12 moles H₂O

Explanation:

To find the amount of water produced, you need to use the given amount and multiply it by the mole-to-mole ratio from the equation. These numbers are the coefficients of the molecules you are converting from and to. When writing the ratio, make sure to arrange it in a way that allows for the cancellation of units.

1 C₆H₆ + 9 O₂ ----> 6 CO₂ + 6 H₂O

2 moles C₆H₆          6 moles H₂O
---------------------  x  -------------------------  =  12 moles H₂O
                                 1 mole C₆H₆

Answer:

B

Explanation:

i just know

Answer:

B

Explanation:

Hydrocarbons are with hydrogen and carbon only, so therefore you can immediately eliminate C and D. Therefore, we are left with A and B. Unsaturated hydrocarbons have double bonds or more, so B would be our answer (Double bond between carbon 1 and 2)

Answer:

It slow down

It slow down when it passes from the less dense air into the denser glass or water

Answer:

Refrigerator

Explanation:

Think about it. Equilibrium is between 2 "places", and if you didn't open the fridge, there would be a buildup of cold air.

Because of that buildup, it would keep getting colder until it isn't possible to get cold anymore. That is equilibrium.

However, if you were to open the door for a very, very long time, you would lower the temp. inside the fridge, therefore causing for the room you are in to be slightly colder, and the fridge to decrease in cold. The fridge will still be slightly cold, but it won't be lukewarm if you leave it for 2 hours. (Unless it's broken)

That is equilibrium :)

Answer:

See below

Explanation:

If your reaction equation is balanced, you will know the number of Fe atoms following the reaction.....it will be the same on both sides of the equation.