Select the correct answer.
What is the chemical formula of trisilicon tetranitride?
A.
Si3N4
B.
Si4N3
C.
Si3N6
D.
Si6N3
E.
Si4N6

Answer:

25.56066

Explanation:

hope this helps !!!!!!! and sorry if it doesn't help

Explanation:

--KI:Potassium iodide

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:

Explanation:

There are only two elements in the first period: hydrogen and helium. We can explain why there is less elements in the first row in modern theories of atomic structure.

Answer:

"Hydrogen and Helium". Hydrogen and Helium are the elements of the first period in the modern periodic table.

Explanation:

Answer:

1. covalent

2. polyatomic ion

Explanation:

:)

Answer:

1) b

2)c

Explanation:

Answer:

Calculate the number of moles you have by taking the Mass / molar mass. if you have 1000 grams ; then 1,000 g / 151.001 g/mol = X g moles. Then multiply by Avogadros # = 6.022140857 × 10^23 molecules per g mole. The result is the # of molecules of MnSO4

Explanation: Hope this helps

Answer: N2F4

Explanation:(NF2)x2 = N2F2

The compound X has a molar mass of 104.01·gmol−1 and the following composition: element mass % nitrogen 26.93% fluorine 73.07%, then the molecular formula of X is N2F4.

Molecular formula is defined as a chemical formula that give the total number of atoms of each elements in each molecule of a substance.

It can also be defined as a phrase that specifies the number of atoms of each element in a complex molecule.

It represents the actual number of each atom in a molecules.

It tells us which atoms and how many of each types of atoms are present in a molecule.

NF2 x 2 = N2F4

Thus, the compound X has a molar mass of 104.01·gmol−1 and the following composition: element mass % nitrogen 26.93% fluorine 73.07%, then the molecular formula of X is N2F4.

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Answer:

Chlorine,Argon

Explanation:

All the elements of group 18 and group 17

The periodic table depicts the various elements arranged based on the increasing order of their atomic numbers. Argon and chlorine will have more valence electrons than sulfur.

A valence electron is an electron of an atom present in the outermost shell that participates in bond formation. The valence electrons are the same in elements placed in the same group or family.

The number of valence electrons increases in a horizontal row called the period of the periodic table. As when one moves from left to right in a period the valence electron increases.

The number of valence electrons in a sulfur atom is 6, whereas in chlorine is 7 and in argon is 8. As chlorine and argon are placed after sulfur in a period will have more valence electrons.

Therefore, argon and chlorine have more valence electron than sulfur.

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Answer:

Since you didnt get asked for a spefic weight of gold lets assume it was 5g

Explanation:

5g Au/197 =.02538 mols in 1 liter of sea water is

.02538/1L which gives you a Molarity of .012538 assuming 5g if they ask for a different number just replace 5 with any weight in grams

Answer:

A

Explanation:

lions only eat meat, antelopes are prey

Answer:

d

Explanation:

because it’s moving the most spots to the left

The acidity or alkalinity of a solution depends upon its hydronium ion concentration and hydroxide ion concentration. Here among the given solutions, the solution D has the highest pH. The correct option is D.

The pH of a solution is defined as the negative logarithm to the base 10 of the value of the hydronium ion concentration in moles per litre. The pH scale is introduced by the scientist Sorensen. It is more easy to express the concentration of H₃O⁺ using this method.

The equation used to calculate the pH of the solution is given as:

pH = -log[H₃O⁺]

For 0.1 M

pH = -log[0.1] = 1

For 0.01 M

pH = -log[0.01] = 2

For 0.001 M

pH =  -log[0.001] = 3

For 0.0001 M

pH =  -log[0.0001] = 4

So solution D has the highest pH which is 4.

Thus the correct option is D.

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Answer:

hi basically also also Aussie

Answer:

just to get points

Explanation:

Answer:

D

Explanation:

Answer:

C) gold - zinc - magnesium - lithium

Answer:

H₂S is the proton donor => Bronsted Acid

Explanation:

Answer:

No. You can not simplify a coefficient of.

Explanation:

:)

Answer:

Condensation happens when molecules in a gas cool down. As the molecules lose heat, they lose energy and slow down. They move closer to other gas molecules. Finally these molecules collect together to form a liquid.

Hopefully this helped :)

Answer:60

Explanation:

60 is 60 is 69 to the l the b i like eating j wek;gnl

Answer:

Calcium

Explanation:

is a silver-gray metal which takes its name from the Latin word calx, which means lime. It is the fifth most abundant element in the earth's crust and is widely distributed as limestone (CaCO3), quicklime (CaO) and calcium fluoride.

Alkaline earth metals are present on the left of the periodic table. Therefore, calcium is the alkaline earth metal is the components of quick lime​.

Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable.

The properties of metals are:

1.Since metals have free electrons that's why they can conduct electricity

2. Since atoms in metals are very closely packed in a definite crystal so these are solid. It is not brittle that is it can not be broken down easily

3. It does not react with water easily.

4.It is denser than water hence it sink in water.

The formula for quick lime is quicklime (CaO). The alkaline earth metal that is component of quick lime is calcium Ca. Quick lime is used in white washing.

Therefore, calcium is the alkaline earth metal is the components of quick lime​.

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Answer:

B.

Explanation:

A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. Each next element in a period has one more proton and is less metallic than its predecessor.

Answer:

15.772%

Explanation:

Answer:

it have more more mass, gravitational potential energy

Explanation:

Option (1) represents the Lewis electron-dot diagram correctly containing nitrogen in the equation.

Lewis Structure is a very simplified representation of the valence shell electrons in a molecule.  It is used to show how the electrons are arranged around individual atoms in a molecule. Electrons are shown as "dots" or for bonding electrons as a line between the two atoms.

Valence electrons are given by hydrogen atoms = [tex]1\times3=3[/tex]

Valence electrons are given by nitrogen atom = [tex]5\times1=5[/tex]

Total valence electrons = 3 + 5 = 8

So, the calculation above is shown only the first option. So, (1) Lewis electron-dot diagram correctly represents the reactant containing nitrogen in the equation.

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Answer:

See explanation

Explanation:

1) From the reaction equation;

2 moles of KClO3 yields 2 moles of KCl

Hence,

4 moles of KClO3 yields 4 * 2/2 = 4 moles of KCl

2) Given that from the reaction equation, we have;

Burning 3 * 6.02 * 10^23 molecules of oxygen yields 2 * 22.4 L of CO2

Hence,

7 * 10^25 molecules of oxygen yields 7 * 10^25 * 2 * 22.4 / 3 * 6.02 * 10^23

= 313.6 * 10^25/18.06 * 10^23

= 17.36 * 10^2

= 1736 L

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: