The first law of thermodynamics is observed when

Answer: There is a couple different ways to determine if a bond is ionic or covalent. By definition, an ionic bond is between a metal and a nonmetal, and a covalent bond is between 2 nonmetals. So you usually just look at the periodic table and determine whether your compound is made of a metal/nonmetal or is just 2 nonmetals.

Correct question is;

Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is?

Answer:

6%

Explanation:

From ohms law, we know that;

R = V/I

Where;

R is resistance

V is voltage

I is current

Now, the percentage error in the resistance is given by the formula;

ΔR/R = ΔV/V+ ΔI/I

We are told that the current and the voltage difference have a percentage error of 3% each. Thus;

ΔR/R = 3% + 3% = 6%

Answer:

Long story short, isotopes are simply atoms with more neutrons — they were either formed that way, enriched with neutrons sometime during their life, or are originated from nuclear processes that alter atomic nuclei. So, they form like all other atoms.

Explanation:

Answer:

See answer below

Explanation:

In this case, you just need to use any acid you want (Like HCl, or H₂SO₄) to do this exercise.

You are given a sample of what you have to do which is:

Acid + metal ------> Salt + hydrogen

As you can see, an acid like the ones I wrote above, have hydrogen atoms, so you should put the hydrogen there. As for the part of salt, you just need to draw the corresponding salt that is formed when the acid reacts with the metal, and write it's name.

Let's do all three equations for you to a better understanding. For all the given examples, I will use HCl as acid, and i will explain one reaction cause the other two reactions happens the same thing, only with a different metal.

1. 2HCl + Zn ------> ZnCl₂ + H₂

As you can see, we just have a displacement reaction where the metal displaces the position of the hydrogen to form the salt and the hydrogen leaves the molecule as a gaseous molecule. Written in words it would be:

Hydrochloric acid + Zinc ----> Zinc chloride + hydrogen

2. 2HCl + Pb -------> PbCl₂ + H₂

Hydrochloric acid + lead ------> Lead (II) chloride + hydrogen

3. 2HCl + Fe -------> FeCl₂ + H₂

Hydrochloric acid + iron ------> Iron (II) chloride + hydrogen

Hope this helps

Answer:

it is very important to know how elements and compounds react together because everything that surrounds us is made out of elements and compounds. Therefore, understanding how these work can allow us to have a better understanding of the world that surrounds us. Moreover, it can avoid accidents when we deal with dangerous compounds, such as when we cook or clean.

Explanation:

Answer:

Haemoglobin is the red pigment which is present in our blood and helps in transporting oxygen to different parts of our body.

Hope it helps

Answer:

Haemeglobin is a red substance that has the function of transporting oxygen into the blood.

Explanation:

Answer:

Strong acids ionize completely in aqueous solutions while weak acids release a few ions in aqueous solutions.

Answer:

If it weren't for the warm water of the Gulf Stream, England would have a much colder climate

Explanation:

Answer:

If it weren't for the warm water of the Gulf Stream, England would have a much colder climate

Explanation: hope it helps ^w^

Answer:

answer is A. Sirus is much closer to Earth than Rigel.

Answer:

A

Explanation:

Answer:

okie!

Explanation:

Answer:

ok i. d k u but thnaks for points ill follow u anyways lol

Explanation:

Answer:

mechanical energy to electrical energy to light energy

Tectonic plates are found in the oceanic and continental lithosphere. The splitting of Africa and the plate tectonics movement is similar to Pangaea as the latter was a large continent that also split.

Pangaea was a large continent in the early geological times that covered almost all the landmass of the earth. It was a supercontinent that underwent splitting after the continental plates started drifting apart, resulting in the formation of the now known continents.

The movement of the Nubian and the Somali plates of Africa is similar to that of the Pangaea as the continent is big and intact now but in the future, the plates will drift very apart, creating more smaller continents.

Therefore, the Pangaea event is similar to the plate tectonic movement of Africa.

Learn more about Pangaea here:

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Answer:

Add copper (II) oxide (insoluble base), a little at a time to the warm dilute sulfuric acid and stir until the copper (II) oxide is in excess (stops disappearing) Filter the mixture into an evaporating basin to remove the excess copper (II) oxide. Leave the filtrate in a warm place to dry and crystallize.

The three main steps involved in producing crystals of the salt copper sulfate is listed below.

Soluble salts can be made by reacting acids with soluble or insoluble reactants.

Titration method is used if the reactants are soluble

Insoluble salts are made by precipitation reactions.

For producing crystals of the salt Copper Sulfate from copper oxide following three steps needs to be done ,

1. Copper oxide is added continuously with a spatula to the Water Bath heated  Sulfuric Acid , until it gets in excess.

2. The mixture is filtered to remove extra Copper Oxide, and then pour the filtrate (Copper sulfate solution) into an evaporating basin , where it is heated to evaporate half of the water .

3. The solution is poured into a watch glass so that all the water evaporates.

Hence we are left with blue and regularly shaped Hydrated copper sulfate crystals .

To know more about Soluble Salts

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Answer: 40 meters per minute

Explanation:

If the total length was 400 meters and it took him 10 minutes, divide 400 by 10 and boom there you go

Answer:

40 m/min

Explanation: why? because I did that before and it was right so I am sure about the answer and all to do is to divide 400 meter and 10 minutes

which you will get 40

400:10 = 40

Answer:

the bus will stop here, wouldn't it?

Answer:

The correct answers are C. Ammonium nitrate - NH4ClO and D. Ammonium phosphate - NH4(PO4)3

Explanation:

Answer:

Because they would keep changing? Or Because they were the hottest?

Answer:

A

Explanation:

Answer:

the ph of an aqueous solution of sulphuric acid which is 5*10^5 mol in concentration is basic in nature

Answer:

newtons first law

Explanation:

an object in motion will stay in motion unless acted upon by an outside force

Answer:

just to get points

Explanation:

Answer:

Explanation:

elemant

compound

mixture

Answer:

Explanation:

heat up the solvent

increse the pressurre of the mixture

add more solute

agitate

Answer:

You cannot determine the point of the origin of a single blood drop because it is just a single drop.

When a drop of blood splatters over the ground drag and trail occurs on it which could be useful when there are a lot of it and you can measure the distance from the origin but in case of a single drop it cannot help you because of one main reson which is distance.

You only CAN measure the direction but not the distance of the one single drop.

Let's take a scenario for a example.

A murderer approaches it's target from behind and grope it's target and stabbed him from front.

You will notice that the blood splatter does not occur in a straight direction but it spreads in kind of in a semicircle.

(THIS IS JUST AN EXAMPLE OF A SCENARIO. there are many other cases but this just an example to make the concept clear)

Hope this answer helped

Answer:

Explained below

Explanation:

Fossil fuels which are made up of coal and oil when burnt by power-production industries, make sulfur to be released into the atmosphere where it combines with oxygen to form SO2 (sulfur Dioxide). Now, the exhausts possessed by cars could also cause the formation of nitrogen oxides in the atmosphere. Therefore, H2SO4 which is airborne sulfuric acid and HNO3 which is nitric acid can be formed and when dissolved in the water vapor in the atmosphere form what is called acid rain.

Now, as acid rain flows through the soil, it can leach aluminum from the soil clay particles and then flow into the lakes to make them more acidic.

Answer:

4.10 x 10⁻⁸  M

Explanation:

The molarity (M) of a solution is defined as the number of moles of solute per liter of solution. We have to first calculate the number of moles of solute (benzene) from the mass and the molecular weight:

Benzene has the chemical formula C₆H₆. So, its molecular weight (MW) is calculated from the molar mass of C (12 g/mol) and H (1 g/mol):

MW(C₆H₆)= (12 g/mol x 6 C) + (1 g/mol x 6 H) = 78 g/mol

Then we convert the mass of benzene (0.32 mg) from mg to grams and divide the mass into the MW:

mass = 0.32 mg x 1 g/1000 mg = 3.2 x 10⁻⁴ g

moles of benzene = mass/MW = 3.2 x 10⁻⁴ g/(78 g/mol) = 4.10 x 10⁻⁶ mol

Now, we convert the volume of solution from dm³ to L:

liters of solution = 100 dm³ x 1 L/1 dm³ = 100 L

Finally, we divide the moles of benzene into the volume of solution in liters:

M = moles of benzene/liters of solution = 4.10 x 10⁻⁶ mol/100 L = 4.10 x 10⁻⁸ mol/L = 4.10 x 10⁻⁸  M