Help , thank you !!

Answer:

D. Bromine (Br)

Explanation:

Based on its position on the periodic table Bromine is the only non-metal from the given choices of elements.

Answer:

C

Explanation:

For A, 2Al(OH)3 contains 6H on the left side of the equation but only has 3H on the right side of the equation, thus its not balanced

For B, there is 2(Al2), which is 4, on the left side of the equation but only 2Al on the right side of the equation, so it is not balanced.

For D, theres a total of 6 H on the left side of the equation as there is (OH)3 and 3H, but none of the right side, so its not balanced.

C is the correct answer as

on the left side of the equation:

2 Al(OH)3 has 2Al, 6O, and 6H

on the right side of the equation:

Al2O3 has 2Al and 3O

3 H20 has 3H and 6O

this makes a total of 2Al, 6H and 6O, which is equal to the number of each element in the left side, thus it is balanced and is the right answer.

In the future for these type of qns, you want to add up the number of each element on the left, then the ride, and see compare the numver of element they have. if the number of all the elements on both sides are the same, the equation is balanced.

Answer:

chloroplasts

Explanation:

chloroplasts are what make plants green, they are not included in animal cells

Answer: Nuclear

Explanation:

Nuclear energy generates power through fission, which involves splitting uranium atoms to produce energy. The heat released by fission is used to create steam that rotates turbine to generate electricity.

The energy produced by nuclear plants is carbon free but the products formed are radioactive and hence their transportation, storage, and disposal is a big problem. It can not be dumped like normal waste.

Answer:

the mass of an does not change with speed but changes when we add or cut a part of it.

Explanation:

Answer:

weight

Explanation:

Answer:

Explanation:

I'm guessing B)

I'm 86.7% sure that might be right.

Answer:

A theory is a broad, natural explanation for a wide range of phenomena.

Answer:

One or more number of species which have same number of atomic number but different mass number are called isotopes.

For example, [tex]^{1}_{1}H, ^{2}_{1}H, ^{3}_{1}H[/tex] are the isotopes of hydrogen.

So here, the atomic number of each of these isotopes is 1 and have different mass number, that is, 1, 2, 3.

Answer:

The balanced chemical equation is :

FeCl3 + 3KOH → Fe(OH)3 + 3KCl

Answer:

They want to escape from the fury of a hurricane.

Explanation:

Your welcomeeeeeeeeeeeee

Answer:

They want to escape from the fury of the hurricane

Explanation:

None of the other choices made sense. They are packing to leave.

Have a splendid day!

Answer:

A mid-ocean ridge is an underwater mountain range, formed by plate tectonics.Mid-ocean ridges represent one of the most important geologic processes shaping the Earth

Answer:

The energy source for all stars is nuclear fusion. Stars are made mostly of hydrogen and helium, which are packed so densely in a star that in the star's center the pressure is great enough to initiate nuclear fusion reactions. In a nuclear fusion reaction, the nuclei of two atoms combine to create a new atom.

Answer:

It is a good conductor of heat and electricity

Its melting point is 1453°C and its boiling point is 2913°C

It's bivalent and it has a valency of two

Answer:

the 7 question answer is c the 24  question answer is b

Explanation:

3,1,2 should be the correct answer

Answer:

white precipitates of PbSO4 will appear

Explanation:

Now let us first consider the reaction equation;

Na2SO4(aq) + Pb(NO3)2(aq) ---->2NaNO3(aq) + PbSO4(s)

So, if i mix solutions of sodium sulfate and lead II nitrate, stir it and allow it to stand for a couple of minutes, i will begin to see the appearance of white precipitates of PbSO4.

This follows from the solubility rules. Sulphates are soluble in water except those of group II ions, Pb^2+ and silver I ion.

Moles of solute for both a and b are the same = 1 mol

Given

a 500 cm³ of solution, of concentration 2 mol/dm³

b 2 litres of solution, of concentration 0.5 mol/dm³

Required

moles of solute

Solution

Molarity shows the number of moles of solute in every 1 liter of solution or mmol in each ml of solution

Can be formulated :

[tex]\large \boxed {\bold {M ~ = ~ \dfrac {n} {V}}}[/tex]

a.

V = 500 cm³ = 0.5 L

M = 2 mol/L

n=moles = M x V

n = 2 mol/L x 0.5 L

n = 1 mol

b.  

V = 2 L

M = 0.5 mol/L

n=moles = M x V

n = 0.5 mol/L x 2 L

n = 1 mol

Answer:

base is also known as alkaline

n sugar is not a base

Answer:

87.5 mol of O2 is required to completely react with 35.0mol of C2H2

Explanation:

The equation is given as;

2C2H2 + 5O2 --> 4CO2  +  2H2O

The acetylene tank contains 35.0 mol C2H2, and the oxygen tank contains 84.0 mol O2.

From the balanced equatioon, the realtionship between the reactants is given as;

2 mol of C2H2 reacts with 5 mol of O2

How many mol of O2 would then react with C2H2?

2 mol C2H2 = 5 mol O2

35 mol C2H2 = x mol O2

Upon solving for x;

x = 35 * 5 / 2

x = 87.5 mol of O2

Answer:

87.5

Explanation:

Answer:

Sulphur is a non-metal because it's valency is 6 and it have many character of non-metal.

Answer:

Periodical development of fundamental particles and structure of atoms can be explained from different atomic models .

Explanation:

Periodical development of fundamental particles :

About 2600 years ago  an Indian sage called kanada proposed that all forms of matter are composed of very small particles called as Anu  and each Anu  is made up of smaller particles called Parmanu .

Later Greek philosopher Democritus called these atoms and according to him  atoms are indivisible and indestructible .

But Later John Dalton's postulate which suggests that atom  is indivisible  is disproved  by various experiments conducted by various scientists   :                                                                                                              

 1. Electron -  J.J Thomson discovered the electron while experimenting with cathode rays   in 1897.                                                                                              

2.  Proton - Proton was discovered by Gold stein in 1920.                              

3. Neutron was discoverer by James Chadwick   in 1932 by bombardment of alpha particle at beryllium .                                                                         Structure of atom :  

Schrodinger's model of atom : This model  is most precise model and  is used  in present days . According to him  electrons are present in a particular region or space around the nucleus called as orbitals where probability of finding the electrons are more.          

Answer:

A

Explanation:

Dr. Laude  prefers the idea that a mole is an amount of a substance you can hold in your hand.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons .Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Learn more about mole,here:

https://brainly.com/question/26416088

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Answer:

Relative atomic mass = 35.5

Explanation:

Given data:

Abundance of Cl -35 = 75%

Abundance of Cl -25 = 25%

Average atomic mass = ?

Solution:  

Relative atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Relative atomic mass = (75×35)+(25×37) /100

Relative atomic mass =  2625 + 925 / 100

Relative atomic mass = 3550 / 100

Relative atomic mass = 35.5

Conversion factor : molar mass/molecular weight

Mass of H₂O produced = 72 g

Given

Reaction

2H2 + O2- 2H20

8 grams of H2

Required

Conversion factors

Solution

We can use the molar mass of the components and the mole ratio as conversion factors for the above equation

mol H₂ (MW = 2 g/mol) :

[tex]\tt mol=\dfrac{8}{2}=4~mol[/tex]

From the equation, mol ratio of H₂ : H₂O = 2 : 2, so mol H₂O = 4 mol

mass H₂O(MW = 18 g/mol) :

mass = mol x MW

mass = 4 x 18

mass = 72 g

Answer:

A, B and C

Explanation:

The 7 rules of chemical change....

Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas. ...

Formation of a Precipitate. ...

Color Change. ...

Temperature Change. ...

Production of Light. ...

Volume Change. ...

Change in Smell or Taste.

Answer:

Chlorine has more mass than the other elements.

Explanation:

We can find the mass of each element using the following equation:

[tex] m = \eta*A [/tex]

Where:

η: is the moles

A: is the standard atomic weight

a) For carbon, we have:

[tex] m_{C} = \eta*A = 1 mol*12.011 g/mol = 12.011 g [/tex]

b) For oxygen, we have:

[tex] m_{O} = 1 mol*15.999 g/mol = 15.999 g [/tex]

c) For chlorine, we have:

[tex] m_{Cl} = 1 mol*35.45 g/mol = 35.45 g [/tex]

d) And for For hydrogen, we have:

[tex] m_{H} = 1 mol*1.008 g/mol = 1.008 g [/tex]

Therefore, chlorine has more mass than the other elements.  

I hope it helps you!          

Answer:

Explanation:

Reactants                                    Product

H = 2                                          H=2

Cl=2                                             Cl=2      

Zn=1                                            Zn=1    

Total number of atoms  5            Total number of atoms  5    

Answer:

poke a hole in the battery ( it should me charged ) and then threw it in water

simple

Answer:

pock a hole and throw it in some water

Explanation: