please please answer this question!!!!!!​

Answer:

2-

Explanation:

Oxygen always act with an oxidation number of 2- unless we're talking of peroxide such as H2O2, where oxygen acts with an oxidation number of 1-

Answer:

it's entertaining. Energy though is the answer

Answer:

hi what are you doing

Explanation:

............

18. the blank should be "[tex]CO_{2}[/tex]"

19. the question seems to be answered.

20. [tex]CH_{3}[/tex]

Answer:

Water.

Explanation:

it can dissolve more substances than any other liquid.

Solving part-1 only

#1

KMnO_4

#2

Actually it's the oxidation number of Mn

Let's find how?

[tex]\\ \tt\Rrightarrow x+1+4(-2)=0[/tex]

[tex]\\ \tt\Rrightarrow x+1-8=0[/tex]

[tex]\\ \tt\Rrightarrow x-7=0[/tex]

[tex]\\ \tt\Rrightarrow x=+7[/tex]

#3

#4

[tex]\boxed{\begin{array}{c|c|c}\boxed{\bf Tube} &\boxed{\bf Charge} &\boxed{\bf No\:of\; electrons\: loss}\\ \sf 2 &\sf +6 &\sf 6e^-\\ \sf 3& \sf +2 &\sf 2e- \\ \sf 4 &\sf 4 &\sf 4e^-\end{array}}[/tex]

Answer:

the atomic mass of the element with 37 protons,43 neutrons and 36 electrons is 80

Answer:

1. The kinetic energies of the particles (atoms, molecules, or ions) that make up a substance. Kinetic energy tends to keep the particles moving apart.

2. The attractive intermolecular forces between particles that tend to draw the particles together.

Answer:

As electro-negativity decreases from Florine to downwards in the group and only Florine is above Chlorine, so Florine should react with sodium chloride solution to produce chlorine.  

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Answer:

Explanation:

Depending upon the relative arrangements of XandY X a n d Y , the square planar molecule AX3Y A X 3 Y shows only the following structure: Hence, only one structure is possible for a square planar molecule with a formula of AX3Y A X 3 Y .

Answer:

metallic

Explanation:

The dislocated electrons moving around the protons create opposite charges with electrostatic attraction between them that are very strong, and are called metallic bonds.

The particles in a metal are held together by strong metallic bonds . The metals forms crystalline solids with highly ordered  lattice structure.

Metals are electropositive elements. They are rich in electrons and easily donate their electrons with non-metals to form ionic bonds. Metals gain  positive charge by losing electrons.

Metals in periodic table are classified as s block elements that are alkali metals and alkaline earth metals and d-block elements that are transition metals.

Metals forms highly ordered crystal lattice 3 D structures  in which metal ions negative ions or electrons are bonded by strong intermolecular force called metallic bonds and the free electrons are located in the interstices.

These electrons can delocalize and conduct thermally and electrically.Hence, the bond which hold the particles in a metal is called metallic bond.

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Answer:

5. False

Explanation:

Drinking contaminated water causes jaundice

Both the elements combine together due to incomplete outermost shell.

Two atoms of element Q mixed with element E​ in order to achieve stability because both the elements have incomplete outermost shell which make them very reactive. In element E we can see that it has 7 electrons while on the other hand, element Q has 5 number of electrons.

For gaining stability, each element has to reach 8 electrons so that's why both the elements react with each other and get stability so we can conclude that both the elements combine together due to incomplete outermost shell.

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Answer:

Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity. An object is accelerating if it is changing its velocity.

hope I help you ☺️❤️⭐

Answer:

your speed

Explanation:

If you start to accelerate, you are bound to move faster

Answer:

The strong electric force.

Explanation:

Trust me. If its wrong, comment on this, don't delete it. If someone else answers with the wrong question than other students might get the answer wrong. So if its right, say that it is, if its wrong, tell others what the real answer is.

Answer:

75%

Explanation:

So, the reaction will consume 1 mole of hydrogen gas and produce

1mole H2⋅2 moles NH33moles H2=0.667 moles NH3

at 100% yield. This represents the reaction's theoretical yield.

Now, you know that the reaction produced 0.50 moles of ammonia. This represents the reaction's actual yield.

In order to find the percent yield, you need to figure out how many moles of ammonia are actually produced for every 100 moles of ammonia that could theoretically be produced.

You know that 0.667 moles will produce 0.50 moles, so you can say that

100moles NH3.in theory⋅0.50 moles NH3.actual0.667moles NH3.in theory=75 moles NH3.actual

Therefore, you can say that the reaction has a percent yield equal to

% yield = 75%

Answer:

Distillation can be used to soften water as the water evaporates as it is heated and the ions are left behind.

Hope that helps. x

Answer: Distillation can be used to separate and collect a liquid from a solution. Distillation can also be used to soften water as the water evaporates as it is heated and the ions are left behind. Hard water can be softened by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.

Explanation:

Answer:

Bubbling and fizzing are likely to occur when a new substance is formed. The other examples are simply changing to a different form of the same substance.

Answer

hydrogen

Explanation:

There are no above options to choose from so I am giving an example of a X3Y2 formula which is Magnesium nitride, the formula is Mg3N2.

Answer:

The weather caused by a warm from and a cold front compare by:

D. A warm front brings rain in humid air on occasion, but a cold front brings thunderstorms in summer.

A warm front is a phenomenon in which a warm air mass replaces a cold air mass, creating fog and rain on one occasion. While the cold front is the replacement of a warm air mass by a cold air mass changing the pressure and creating a thunderstorm in the middle of summer. The warm front happens in zones close to the equator and the cold fronts happen in almost every place.

Hope that helps. x

Answer:

2H2 and O2

Explanation:

Answer:

Covalent compounds (solid liquid solutions)  

non-metal elements are insulators but not conductors of electricity.

Explanation:

Metal elements and carbon (graphite) are conductors of electricity

By definition, electrolysis is the use of an electric current to cause a chemical reaction which wouldn't otherwise happen. In a chemical change, bonds are either broken or formed. Electrolysis is a chemical change because, in the process of electrolysis, bonds are broken or formed.

Answer:

D. A burning candle. (chemical energy into energy of heat and light, i.e. thermal and wave)

Explanation:

comment and tell me if it right.

The situation in which chemical energy being converted to another form of energy is a burning candle.

So, option D is correct one.

The energy produce by the chemical reaction is called chemical energy.

Example: burning of candle.

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Answer:

5 moles S x (36.02 g S/mole S) = 180.1 grams of S

Explanation:

The periodic table has mass units for every element that can be correlated with the number of atoms of that element.  The relationship is known as Avogadro's Number.  This number, 6.02x[tex]10^{23}[/tex] , is nicknamed the mole, which scientists found to be a lot more catchy, and easier to write than  6.02x[tex]10^{23}[/tex].  The mole is correlated to the atomic mass of that element.  The atomic mass of sulfur, S, is 36.02 AMU, atomic mass units.  But it can also be read as 36.02 grams/mole.

This means that 36.02 grams of S contains 1 mole (6.02x[tex]10^{23}[/tex]) of S atoms.

This relationship holds for all the elements.  Zinc, Zn, has an atomic mass of 65.38 AMU, so it has a "molar mass" of 65.38 grams/mole.  ^5.38 grams of Zn contains 1 mole of Zn atoms.  

And so on.

5.0 moles of Sulfur would therefore contain:

(5.0 moles S)*(36.02 grams/mole S) = 180.1 grams of S

Note how the units cancel to leaves just grams.  The units are extremely helpful in mole calculations to insure the correct mathematical operation is done.  To find the number of moles in 70 g of S, for example, we would write:

(70g S)/(36.02 grams S/mole S) = 1.94 moles of S.  [Note how the units cancel to leave just moles]

Answer:

1. 39.997 g/mol

2. 6.022⋅1023 atoms of aluminium

3. 0.026 moles

4. 14 grams is the molar mass of nitrogen meaning that one mole of nitrogen atoms is 14 grams. One mole of any substance has 6.02*10^23 atoms/molecules of that subtance therefore there are 6.02*10^23 atoms of nitrogen in 14g of nitrogen

5. 78.5

Explanation: