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3 years ago

Hi um whats a single and double reaction

1 answer:

3 0

A single-replacement reaction is a chemical reaction in which one element is substituted for another element in a compound, generating a new element and a new compound as products.

A double-replacement reaction occurs when parts of two ionic compounds are exchanged, making two new compounds. A characteristic of a double-replacement equation is that there are two compounds as reactants and two different compounds as products.

The key difference between single displacement and double displacement reaction is that, in single displacement reactions, one chemical species replaces a part of another chemical species whereas, in double displacement reactions, exchange of two ionic species between two molecules occur.

Hope this helps you.

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How long does it take the sun to melt a block of ice at 0∘c with a flat horizontal area 1.0 m2 and thickness 1.8 cm ? assume tha

VLD [36.1K]

This is a problem involving heat transfer through radiation. The solution to this problem would be to use the formula for heat flux.

ΔQ/Δt = (1000 W/m²)∈Acosθ

A is the total surface area:
A = (1 m²) + 4(1.8 cm)(1m/100 cm)(√(1 m²))
A = 1.072 m²

ΔQ is the heat of melting ice.
ΔQ = mΔHfus
Let's find its mass knowing that the density of ice is 916.7 kg/m³.
ΔQ = (916.7 kg/m³)(1 m²)(1.8 cm)(1m/100 cm)(<span>333,550 J/kg)
</span>ΔQ = 5,503,780 J

5,503,780 J/Δt = (1000 W/m²)(0.05)(1.072 m²)(cos 33°)
<em>Δt = 122,434.691 s or 34 hours</em>

4 0

3 years ago

A 3.82 g piece of limestone contains 2.62 g of CaCO3

Kobotan [32]

Considering the definition of percentage by mass, the mass percentage of CaCO₃ is 68.59%.

<h3>What is mass percentage</h3>

The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.

In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

$mass percentage=\frac{mass of solute}{mass of solution}x100$

<h3>Mass percentage of CaCO₃</h3>

In this case, you know:

mass of CaCO₃: 2.62 grams
mass of limestone: 3.82 grams

Replacing in the definition of mass percentage:

$mass percentage=\frac{2.62 grams}{3.82 grams}x100$

<u><em>mass percentage= 68.59 %</em></u>

Finally, the mass percentage of CaCO₃ is 68.59%.

Learn more about percentage by mass:

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7 0

2 years ago

Lien made this table to organize her notes on the properties of acids and bases. Which property is in the wrong column? conduct

OLEGan [10]

Tatses bitter is the anwser i did the test

8 0

3 years ago

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When a hot dog is cooked, is that a physical change or chemical change

kifflom [539]

Its a Chemical change

4 0

3 years ago

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What did Dalton’s atomic theory teach

sweet-ann [11.9K]

Answer:

All matter is composed of atoms.

Atoms are not destructible.

Compounds formation occur by the combination of one or different types of atoms

In the chemical reactions, atoms are rearranged.

The atom of the same elements are similar in size and properties and the Atoms of the different elements are different in size and properties.

Explanation:

<u>John Dalton has developed the Dalton atomic theory.</u>

Dalton atomic theory was the first to explain that all matters composed of atoms and its properties, the atom as the smallest particle which cannot be destroyed and damaged.

This theory was based on the <u>law of conservation of mass and law of constant composition.</u>

His theory was accepted by many scientists.

6 0

4 years ago

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