Why does copper have a high melting point?

Answers

Answer 1

Answer:

The ability to be drawn into thin sheet is called malleability. The ability to be drawn into thin wires is called ductility. Copper have a high melting point due to metallic bonding.

What is metallic bonding?

Metallic bonding is a type of chemical bonding that rises from the electrostatic attractive force between conduction electrons and positively charged metal ions. Metallic bonds are more more strong than covalent bond and ionic bond

Metallic bonds is between metals and metals, have the malleable and ductile property. Elements which have metallic bonding have high melting and boiling point. Since copper is a metal, it form strong metallic bond with itself. So, copper have a high melting point.

Therefore, copper have a high melting point due to metallic bonding.

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Answer 2

Answer: copper has a high melting point - basically put - is because the bond of copper atoms (held together by electro statical attraction) to themselves is so strong, only a very high temerature can break the bond.

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A 125 mL aqueous solution contains 1.86 mc032-1.jpg 10–5 g of potassium chloride and has a density of 1.02 g/mL. What is the concentration in ppm?

Answers

mass of the solvent (H2O) in kg

D = m / V

1.02 = m / 125

m = 1.02 x 125

m = 127.5 g of H2O

127.5 / 1000 => 0.1275 kg

mass of solute in mg:

1000 x ( 1.86 x 10⁻⁵ ) = 0.0186 mg

ppm = mass of solute in mg / mass of solvent in kg

ppm = 0.0186 / 0.1275

= 0.1458 ppm

hope this helps!

Answer:

Explanation:

Do electrolytes contain ions?

Answers

Yes

Filling in the 20 word ruleeeeeeee jejene jejjene

Answer: yes

Explanation: they contain sodium, potassium, chloride, bicarbonate, calcium, phosphate, magnesium, copper, zinc, manganese, molybdenum, copper, and chromium also.

Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S(g) + 3F2(g) ->SF6(g) If 50 g S is allowed to react as completely as possible with 105.0g F2(g), what mass of the excess reactant is left.

Answers

Answer: The mass of excess reagent left is 20.48 g

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For sulfur:

Given mass of sulfur = 50 g

Molar mass of sulfur = 32 g/mol

Putting values in equation 1, we get:

$\text{Moles of sulfur}=(50g)/(32g/mol)=1.56mol$

For fluorine gas:

Given mass of fluorine gas = 105 g

Molar mass of fluorine gas = 37.99 g/mol

Putting values in equation 1, we get:

$\text{Moles of fluorine gas}=(105g)/(37.99g/mol)=2.76mol$

The chemical equation for the reaction of sulfur and fluorine gas follows:

$S(g)+3F_2(g)\rightarrow SF_6(g)$

By Stoichiometry of the reaction:

3 moles of fluorine gas reacts with 1 mole of sulfur

So, 2.76 moles of fluorine gas will react with = $(1)/(3)* 2.76=0.92mol$ of sulfur

As, given amount of sulfur is more than the required amount. So, it is considered as an excess reagent.

Thus, fluorine gas is considered as a limiting reagent because it limits the formation of product.

Moles of excess reagent (sulfur) left = 1.56 - 0.92 = 0.64 moles

Now, calculating the mass of sulfur from equation 1, we get:

Molar mass of sulfur = 32 g/mol

Moles of sulfur = 0.64 moles

Putting values in equation 1, we get:

$0.64mol=\frac{\text{Mass of sulfur}}{32g/mol}\n\n\text{Mass of sulfur}=20.48g$

Hence, the mass of excess reagent left is 20.48 g

The mole number of 50 g S is 1.563 mol. 105.0 g F2 is 2.763 mol. The ratio of S and F2 is 1:3. So the excess one is S. And mass left is 0.642*32=20.52 g.

What is the theoretical yield of hydrogen gas if 5.00 mol of zinc are added to an excess of hydrochloric acid?

Answers

the theoretical yield of hydrogen gas is 10 g

calculation

Step 1: write the equation for reaction

Zn + 2 HCl → zncl₂ + H₂

Step 2: use the mole ratio to find the moles of H₂

from equation above Zn : H₂ is 1: 1 therefore the moles of H₂ = 5.00 moles

Step 3: find the theoretical yield(mass) for H₂

mass = moles × molar mass

from periodic table the molar mass of H₂= 1×2 = 2 g/mol

mass = 5 moles × 2 g/mol = 10 grams

Answer:

B. 10.1 g

Explanation:

When does phenolphthalein turn pink?a) in the presence of a base

b) in the presence of an acid

c) when it is in a neutral solution

d) when it is reacting with a metal

Answers

Answer is: a) in the presence of a base.

Phenolphthalein is colorless in acidic solutions and pink in basic solutions.

Acid-base indicators are usually weak acids or bases and they are chemical detectors for hydrogen or hydronium cations.

Example for acid-base indicator is phenolphthalein (molecular formula C₂₀H₁₄O₄).

When solution turns phenolphthalein pink, it means it is basic (pH>7).

Final answer:

Phenolphthalein turns pink in the presence of a base.

Explanation:

Phenolphthalein turns pink in the presence of a base. It is a pH indicator that changes color depending on the acidity or alkalinity of a solution. In an acidic solution, phenolphthalein remains colorless, while in a basic solution, it turns pink.

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PLEASE HELPSusana heats up a sample of red crystals. While the sample is being heated, a gas is released and a blue powder is left after the heating. Is the sample of red crystals an element or a compound? Explain your answer.

Answers

Because more than one substance was released (following a color change signifying a chemical reaction), the sample was indeed, a compound.

Sample response: Susana's red crystal sample is a compound because it was broken down into a gas and blue powder. It is not an element because elements cannot be broken down into simpler substances by ordinary means, such as heating.

This is late but if anyone needs it here you go.

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