Introduction to atoms) How do I do this

Answer:

paleontologists is the answer to scientist who studies fossil

Answer:

I think its (B)

Explanation:

as when the air thins out at higher elevations, your lift decreases so at some point, the plane cant produce enough lift to overcome gravity.

Answer:

From the equation above we get 1 amu = 1g/NA or 1 amu = 1.66054x10^-24 g. Thus, a mole of magnesium atoms has a mass of NA x 24.305 amu x (1.66054x10^-24 g/amu) = 24.305 g. A mole of magnesium atoms has a mass of 24.305 g.

Explanation:

1 mole of MgO has 146.35 × [tex]\rm 10^2^3[/tex] atoms of Mg.

The number of atoms found in a mole of compound has been given by relationship between the mole and the Avogadro number. The Avogadro number has been the constant that has been given by the number 6.023 × [tex]\rm 10^2^3[/tex].

The relationship between the atoms and mole has been given by:

1 mole = 6.023 × [tex]\rm 10^2^3[/tex] atoms.

So, the number of atoms that has been present in1 mole of the MgO has been equivalent to the Avogadro number.

Thus, 1 mole of MgO has 6.023 × [tex]\rm 10^2^3[/tex] atoms.

The mass of there has been 1 molecule of Mg in the MgO compound, thus, the atoms of Mg can be given by:

Mg atoms = Mass of Mg × Avogadro number

Mg atoms = 24.3g × 6.023 × [tex]\rm 10^2^3[/tex]

Mg atoms = 146.35 × [tex]\rm 10^2^3[/tex]

Thus, 1 mole of MgO has 146.35 × [tex]\rm 10^2^3[/tex] atoms of Mg.

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Answer:

1 and 3

Explanation:

Answer: A and B or 1 and 3

Explanation:

Answer:  It is element nitrogen. It has an atomic number of 7 and the valence electron is 5. It needs 3 electrons to complete its octet state. That's why sometimes it has the oxidation number of -3 in ammonia.

Answer:

Thermal energy (B)

Explanation:

just did it

Electrical energy is transformed into thermal energy in the toaster, and chemical energy is transformed into thermal energy in the toast. Hence option b is correct.

Chemical energy is defined as chemical substances' potential energy, which is released as they experience chemical reactions and change into other substances. Additionally, it is what binds a substance's molecule's together. The body transforms or changes the chemical energy in food into heat and mechanical motion.

The wire attached to the power source transmits electrical energy to the toaster. The heating element is a part of the toaster. This heating element transforms electrical energy into heat energy, which aids in toast preparation, when it comes into contact with it. Thus, with an electric toaster, electrical energy is converted to heat energy.

Thus, electrical energy is transformed into thermal energy in the toaster, and chemical energy is transformed into thermal energy in the toast. Hence option b is correct.

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Answer: the difference is due to the fact that one water molecule has two hydrogen atoms to one oxygen this means it takes two water molecules (2 H2O) to make one oxygen molecule (02) .At the same time however two molecules of water (2 H20) can make two molecules of hydrogen (2 H20)

Explanation: hope this helped and mark me as brainliest please =)

Answer:

The unit of molar mass is kg/mol. Where, m = mass, v = velocity.

Hope that helps :)

Answer:

In general, organic acids are weak acids and do not dissociate completely in water, whereas the strong mineral acids do. Lower molecular mass organic acids such as formic and lactic acids are miscible in water, but higher molecular mass organic acids, such as benzoic acid, are insoluble in molecular (neutral) form.

will this help?

Glacial evidence found in South America, do indicate how evidence of climate change has supports the theory of continental drift.

Conclusively, we can therefore say that Glacial evidence found in South America, do indicate how evidence of climate change has supports the theory of continental drift.

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Answer:

glacial evidence found in South America

Explanation:

The density is the ratio of the mass to the volume. The density of the object is 44.1 g/cm³.

Density (ρ) is the quantitative measurement of the substance having grams of mass that are dissolved per cubic meter of the solution. The density is calculated as:

ρ = M ÷ V

Given,

Mass of the object = 441 gm

The volume of the object = 10 cubic meter

Density is calculated as:

ρ = 441 ÷ 10

= 44.1 g/cm³

Therefore, 44.1 g/cm³ is the density of the object.

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Percent yield of water : 70%

Reaction

2H₂ (g) + O₂ (g) → 2H₂O (g)

mol H₂(MW= 2 g/mol) :

[tex]\tt \dfrac{13.8~g}{2~g/mol}=6.9~mol[/tex]

mol H₂O = mol H₂ = 6.9

mass H₂O(theoretical) :

[tex]\tt 6.9\times 18~g/mol=124.2~g[/tex]

[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\\%yield=\dfrac{87}{124.2}\times 100\%=70\%[/tex]

Answer:

Delta, or subject to change.

Explanation:

Δ→ triangle indicates that the reaction is being heated.

Chemical equations are symbolic representations of chemical reactions in which the reactants and the products are expressed in terms of their respective chemical formulae.

To express heating, we usually use Δ over reaction arrows like:

[tex]CaCO_ 3[/tex]. Δ → [tex]CaO+O_2.[/tex]

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Answer:

Diversification and adaptive radiation.

Explanation:

Answer:

density = 8.9 g/ml

m = 20.5 g

V = ... ?

density = m/V

V = m / density

= 20.5 / 8.9

= 2.30337 ml

Answer:

4 th is the answer......

Explanation:

Equation -

CaCO₃ → CaO + CO₂

molecular masses of -

CaCO₃ = 40+12+16×3 = 100 g/mol

CaO = 40+16 = 56 g/mol

CO₂ = 12+16×2 = 44 g/mol

Now,

If 100 g of CaCO₃ is decomposed then it produces 56 g of CaO and 44g of CO₂

Then,

If 1 g of CaCO₃ is decomposed then it produces 56/100g of CaO and 44/100g of CO₂

Now,

Here in question, 10g of CaCO₃ is decomposed

It means, It produces

56/100 × 10 = 56/10 = 5.6 g of CaO and

44/100 × 10 = 44/10 = 4.4 g of CO₂

Now,

we get that 10 g of CaCO₃ on burning produces 4.4 g of CO₂

we need to calculate volume of 4.4 g of CO₂

Then,

mole = 4.4/44 = 0.1

Now,

volume = mole × 22.4 (in Litres)

= 0.1 × 22.4 = 2.24 L

Hence,

2.24 L of CO₂ will be produced when 10g of CaCO₃ decomposed.

Answer:

1270 mmHg

Explanation:

Answer : 1270 mmhg

Explanation:

Answer:

Explanation:

E

Answer:

A

Explanation:

Answer:

If the temperature increases, temperature reflects the speed of the molecules, so if the molecules are at a higher temperature, they are faster and they start to break bonds and new things react.

Explanation:

Answer:

10.5

Explanation:

well we added together so thats the result

Answer: Number 1 is titanium.

The one where you calculate a tin block is 13.0cm.

3. Is A) Same Density And Same Chemical Properties.

4. Is also A. Ne

Explanation:

Moles of potassium nitrate produced : 0.76

The reaction equation is the chemical formula of reagents and product substances

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

Reaction

2KI + Pb(NO₃)₂ ⇒ 2KNO₃ + Pbl₂

MW KNO₃ : 101.1032 g/mol

MW Pbl₂ = 461,01 g/mol

175 grams of Pbl₂ , mol :

[tex]\tt mol=\dfrac{175}{461.01}=0.38[/tex]

mol ratio KNO₃ : Pbl₂ = 2 : 1, so mol KNO₃ = 0.38 x 2 = 0.76

Mass of KNO₃ :

[tex]\tt mass=0.76\times 101.1032=76.838~g[/tex]

Answer: silicon

Explanation:it just is

Respuesta

es la C. silicio

Explanation:

No existe una definición estandarizada de elemento metaloide ni un consenso completo sobre los elementos que son metaloides.

En la clasificación de metaloides se suelen incluir a:

Boro (B)

Silicio (Si)

Germanio (Ge)

Arsénico (As)

Antimonio (Sb)

Telurio (Te)

Answer:

AGREE

Explanation:

thanks for the free points also :)