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Answer:

Dalton's atomic theory has been modified as

Explanation:

Atoms of same element may not have same atomic mass. For example, some atoms of chlorine have atomic mass 35 amu while others have atomic mass 37 amu. Such atoms of same element having different atomic masses are called isotopes

Answer:

On the basis of new experimental facts, Dalton's atomic theory has been modified as: ... Atoms of same element may not have same atomic mass. For example, some atoms of chlorine have atomic mass 35 amu while others have atomic mass 37 amu. Such atoms of same element having different atomic masses are called isotopes.

Explanation:

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Answer:

Well its actually the movement of tectonic plates under the earths surface that when the slide along each other, pull away from each other, or push up against each other they create earth quakes.

Explanation: yes.

Answer:

the answer is 4

Explanation:

i took the test and got it right and i would recommend using quizlet it has these flash cards and the answers are there you just click on the one that says your question and it will say your answer on the back. It helps with most of my test! Hope this helps (:

Answer:

Thus there was no accumulation of ions on the nails, as the dissolved gases were already removed, hence no rust formation. In test tube C, a chemical was added to absorb the water vapour. We know that rust formation takes place when a metal is exposed to water vapour.

Explanation:i hope u have a wonderful night and stays safe

Answer:

4 moles Fe(s)

Explanation:

Fe₂O₃(s) + 3CO(g) → 3CO₂(g) + 2Fe(s)

Reaction shows a 3:2 ratio between CO(g) & Fe(s) ...

∴moles of Fe(s) produced = 2/3(6) moles Fe(s) produced = 4 moles Fe(s)

Answer:

is a way of presenting information about the chemical proportions of atoms

Explanation:

Answer:

Nucleus

Explanation:

The nucleus serves as the cells command center, sending direction to the cell to grow, mature, divide, or die

Answer:

The kinetic-molecular theory explains why gases are more compressible than either liquids or solids. Gases are compressible because most of the volume of a gas is composed of the large amounts of empty space between the gas particles. Compressed gases are used in many situations.

Explanation:

Answer:

a mixture

Explanation:

Two or more substances combined chemically, are called a compound

Answer:

i = 1

Explanation:

Van't Hoff factor (i) is explained as the number of ions dissolved in solution.

It is needed to determine colligative properties which depend on the amount of solute.

C₇H₇NO is an organic compound → benzamide

All the organic compound have 1, as Van't Hoff factor.

In order to predict i, you consider ionic salts. For example:

AlCl₃

CaCl₂

NH₄NO₃

When you dissociate them, you determine i:

AlCl₃ →  Al³⁺  +  3Cl⁻                   i =4

CaCl₂ →  Ca²⁺  +  2Cl⁻            i = 3

NH₄NO₃  →  NH₄⁺  +  NO₃⁻        i =2

The van't Hoff's factor of C₇H₇NO is 1

The Van't Hoff factor denoted with the symbol i is the number of ions dissolved in solution.

C₇H₇NO (benzamide) is an organic compound and as such, it have a Van't Hoff's factor of 1

Learn more about Van't Hoff's factor:

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Answer:

the metal loses electrons to become a positively charged cation

Explanation:

Ca is -2

Be is stabilized

Ba is -4

Sr is -3

so it would be =>  Ba, Sr, Ca, Be

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The arrangement of the alkaline earth metals from the lowest to highest electronegativity is; Ba< Sr< Ca<Be

Electronegativity refers to the ability of the atoms of an element in a compound to attract the shared electrons of that bond towards itself. It is a property that decreases down the group but increases across the period.

Electronegativity increases across the period as atoms of elements become smaller in size and decreases down the group because of increase in distance between the valence electrons and nucleus.

Since electronegativity decreases down the group, the order of electronegativity from lowest to highest is; Ba< Sr< Ca<Be

Learn more: https://brainly.com/question/2060520

Answer:

Explanation:

The speed of sound in the air mainly depends on temperature. At high altitudes, where it is much colder, sound travels slower. The higher the temperature, the faster the air molecules are moving to begin with, and the quicker they bump into each other as a sound wave passes through.

Answer:

Air molecules have more energy at higher temperature which means they vibrate faster

Answer: C) a proton is in the nucleus, has a positive charge, and an atomic mass of 1 amu.

Explanation:

Protons are positive so they give a positive charge, they are also never outside of the nucleus.  Only electrons are outside the nucleus.

Answer:

Hrxn = -241.82 kJ

Explanation:

2H2(g) + O2(g) --> 2H2O(g) Hrxn = -483.64 kJ ............. (i)

The equation for formation of 1 mol of H2O is given as;

H2(g) + 1/2O2(g) --> H2O(g) ................. (ii)

Eqn (ii) is obtained by dividing eqn (i) by 2

That means the heat of reaction for eqn (ii) is given as;

Hrxn = -483.64 kJ / 2

Hrxn = -241.82 kJ

Answer:-241.82 kJ

Explanation:

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Answer:

Synthesis reaction~~~~~~~

Explanation:

Answer: 1) [tex]2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O[/tex]

2) [tex]2C_4H_{10}+13O_2\rightarrow 8CO_2+10H_2O[/tex]

3) [tex]2C_8H_{18}+25O_2\rightarrow 16CO_2+18H_2O[/tex]

4)[tex]2C_{10}H_{22}+31O_2\rightarrow 20CO_2+22H_2O[/tex]

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side.

The balanced chemical reactions will be:

1) Ethane + Oxygen = Carbon Dioxide + Water : [tex]2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O[/tex]

2) Butane + Oxygen = Carbon Dioxide + Water : [tex]2C_4H_{10}+13O_2\rightarrow 8CO_2+10H_2O[/tex]

3) Octane + Oxygen = Carbon Dioxide + water: [tex]2C_8H_{18}+25O_2\rightarrow 16CO_2+18H_2O[/tex]

4) Decane + Oxygen = Carbon Dioxide + Water :  [tex]2C_{10}H_{22}+31O_2\rightarrow 20CO_2+22H_2O[/tex]

Answer:

10.60 grams of silane gas are formed.

Explanation:

From the reaction:

Mg₂Si(s) + 4H₂O(l) → 2Mg(OH)₂(aq) + SiH₄(g)          

We know that the limiting reactant is Mg₂Si, so to find the mass of SiH₄ formed we need to calculate the number of moles of Mg₂Si:

[tex]\eta_{Mg_{2}Si} = \frac{m_{Mg_{2}Si}}{M_{Mg_{2}Si}}[/tex]

Where:

m: is the mass of Mg₂Si = 25.0 g

M: is the molar mass of Mg₂Si = 76.69 g/mol

[tex]\eta_{Mg_{2}Si} = \frac{m_{Mg_{2}Si}}{M_{Mg_{2}Si}} = \frac{25.0 g}{76.69 g/mol} = 0.33 moles[/tex]

Now, the stoichiometric relation between Mg₂Si and SiH₄ is 1:1 so:

[tex] \eta_{Mg_{2}Si} = \eta_{SiH_{4}} = 0.33 moles [/tex]

Finally, the mass of SiH₄ is:

[tex] m_{SiH_{4}} = \eta_{SiH_{4}}*M_{SiH_{4}} = 0.33 moles*32.12 g/mol = 10.60 g [/tex]

Therefore, 10.60 grams of silane gas are formed.

I hope it helps you!    

Answer:Tungsten is made of tungsten while Nichrome is made of nickel chromium. ... Tungsten is used to make filament of bulbs. Nichrome have high resistivity than tungsten.

Explanation:i hope u have a wonderful night and stay safe

Answer:

B. Unbalanced force

Explanation:

Answer:

I think its unbalanced force

Explanation:

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Answer:

Force

Explanation:

The force is applied to either pushing or pulling forwarding momentum and movement.

Answer:

A: Force

It is a push/pull that changes the motion of an object

Answer:

Fe 2 O3 .

Explanation:

Answer:It has 8grams of hydrgen

Explanation: