Also need help with this question .. ik I’m asking a lot, I’m very confused

Answer:

1 and 3

Explanation:

Answer: A and B or 1 and 3

Explanation:

Answer:"You can change an object's state of matter by adding or removing thermal energy. When you add thermal energy to an object, these things can happen: Particles move faster (increased kinetic energy). Particles get farther apart (increased potential energy)."

Explanation:

Answer:

AGREE

Explanation:

thanks for the free points also :)

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.

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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Answer:

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

Hope that helps :)

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.

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:

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: 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)

Red

Litmus paper turn red when it comes in contact with acid. It turn blue if it come in contact with a base. Neutral litmus paper is purple

Answer:

Explanation:

E

Answer:

4 th is the answer......

Answer:

Explanation:

Both eukaryotic and prokaryotic cells have a cell membrane, which defines the limit between the environment surrounding the cell and the cell itself.

Eukaryotic cells can be either animal cells or plant cells. Plant cells, apart from the membrane, are surrounded by a cell wall that is thick and conformed by carbohydrates and peptides. This cell wall makes the cell resistant and gives it its shape. Animal cells, on the other hand, do not have cell walls, they only have the cell membrane, that regulates the entrance of nutrients and the exit of metabolic products.

Answer:

10.5

Explanation:

well we added together so thats the result

Answer:

A

Explanation:

Answer:

The answer is D. it can be mass produced

Explanation:

Answer:

The answer is D It can be mass produced.

Explanation:

I just took the test

Answer:

Diversification and adaptive radiation.

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:

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:

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:

Answer:

far left

Explanation:

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:

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:

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:

paleontologists is the answer to scientist who studies fossil