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3 years ago

Explain why we did not see distinct lines (like on an emission spectrum) when the metal salts were burned.

1 answer:

6 0

Actually when we burn metal salts, we cannot actually really see distinct lines to appear because in reality, they are not really visible to the human eye. There is only a certain range of wavelength of light that our eyes can see.

To state in other way, some metal salts will give off light which has wavelengths that are outside of the visible region of the electromagnetic spectrum.<span> </span>

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Boiling point vs melting point

erik [133]

Answer: ✅

The main difference between boiling point and melting point is that the melting point is defined as the temperature at which solid and liquid phases are in equilibrium, whereas the boiling point is the temperature at which the vapour pressure of a liquid is equal to the external pressure.

IamSugarBee

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4 years ago

A sample of seaweed contains 1 liter of water and has 50 grams of salt dissolved in its cells. The seaweed is placed in a soluti

masha68 [24]

seaweed having 50 g salt in 1 L water. The bucket contains 150 g of salt in 2 L of water

amount of water present in bucket is twice to amount of water in weed

$V¬_water bucket=2×V_water weed$

At equilibrium, volume of water in weed is x and volume in bucket is y but concentration remain same as follows:

$50 /x=150 /y\\ Y = 3 x$

At equilibrium, weed loose z L from 1 L water to bucket containing 2 L as follows:

$(2 + z) = 3 (1-z)\\ (2 + z) = 3 – 3 z\\ Z = 0.25 L$

Thus, Weed will loose 0.25 L of water

5 0

3 years ago

Read 2 more answers

How many grams of MgCO3 are required to neutralize 200. mL of stomach acid HCl, which is equivalent to 0.0465 MHCl?

tester [92]

<h3>Answer:</h3>

0.392 g

<h3>Explanation:</h3>

We are given the following;

Volume of HCl is 200 mL

Molarity of HCl is 0.0465M

We are required to calculate the mass of MgCO₃ required

<h3>Step 1: Write the balanced equation for the reaction </h3>

The balanced equation for the reaction is;

MgCO₃(s) + 2HCl(aq) → MgCl₂(aq) + CO₂(g) + H₂O(l)

<h3>Step 2: Calculate the moles of HCl</h3>

When given the molarity of a compound and the volume, the number of moles can be calculated by;

Number of moles = Molarity × Volume

Therefore;

Volume of HCl = 0.0465 M × 0.2 L

= 0.0093 moles

<h3>Step 3: Calculating the number of moles of MgCO₃</h3>

From the equation, one mole of MgCO₃ reacts with two moles of HCl

Therefore, the mole ratio of MgCO₃ : HCl is 1 : 2

Hence, moles of MgCO₃ = Moles of HCl ÷ 2

= 0.0093 moles ÷ 2

= 0.00465 moles

To calculate the mass of a compound we need to multiply the molar mass of a compound with the number of moles.

Molar mass of MgCO₃ is 84.314 g/mol

Thus, Mass of MgCO₃ = 0.00465 moles × 84.314 g/mol

= 0.392 g

Therefore, 0.392 g of MgCO₃ are required to neutralize the acid.

3 0

4 years ago

What is a good definition of the atomic radius? Note: you cannot use 'radius' in your definition

Andreas93 [3]

Answer:

the distance between the electron and nucleus

7 0

3 years ago

What type of reaction is: sulfuric acid + potassium hydroxide -> potassium sulfate + water?

aleksley [76]

Answer:

Double replacement reaction

Explanation:

Now, let us first write the reaction equation properly:

H₂SO₄ + 2KOH ⇒ K₂SO₄ + 2H₂O

The above reaction is a neutralization reaction between an acid and a base whose product gives salt and water only at most instances.

From here, we can observe that the species displaces on another in their ionic state. Hydrogen replaces potassium and water is produced. Potassium combines chemically with sulfate ions to give the salt of potassium.

4 0

4 years ago