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3 years ago

Which property of metals cannot be explained with the electron-sea model?

1 answer:

7 0

The answer is e.trends in melting points. The conductivity, shininess, malleability and ductility are associated to the electron-sea model. The characteristics of metallic bonds basically describe many of the physical properties of metals by using the formation of the so called sea of electrons that are free to move around.

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Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the formul

Rudik [331]

F₂(g) + Ca(s) → CaF₂(s)

5 0

4 years ago

Read 2 more answers

Name 8 ways why landfill is bad for earth

Sergio039 [100]

Answer:

1.Creates environmental hazards

2.Can contribute to global warming processe

3.Can pollute harmful and toxic things in the air

4.has harmful gases that can hurt the environment including the water and soil

5.A waste of space that is taking up the earth

6.full of rubbish and toxins that can effect the environment

7.can hurt humans and animals because of the toxic chemicals produced in the air

8.Make the land soil weaker because of the bad toxins and chemicals

4 0

3 years ago

What volume, in milliliters, of water is needed to make an 8.40 M solution of HCl acid using 180. grams of HCI ?

8_murik_8 [283]

Answer:

0 587 mL

Explanation:

First we convert 180 grams of HCl into moles, using its molar mass:

180 g ÷ 36.46 g/mol = 4.94 mol HCl

Now we can use the number of moles and the given concentration to calculate the required volume, applying the definition of molarity:

Molarity = moles / liters

Liters = Moles / molarity

4.94 mol / 8.40 M = 0.588 L

Finally we convert liters into milliliters:

0.588 L * 1000 = 588 mL

The closest answer is option C, 587 mL.

7 0

4 years ago

What is the density of a liquid with a mass of 6 grams, and a volume of 3 milliliters?

uranmaximum [27]

Answer:

2 g/mL

Explanation:

Density can be calculated using the ratio:

Density = mass (g) / volume (mL)

Since you have been given both the mass and volume of the liquid, you can calculate the density.

Mass = 6 grams (g)

Volume = 3 milliliters (mL)

Density = mass / volume

Density = 6 g / 3 mL

Density = 2 g/mL

3 0

2 years ago

A sample from a local stream is found to have 3.0 ppm nitrates (in the form of sodium nitrate). How many grams of sodium nitrate

maw [93]

Answer:

0.01028 grams of sodium nitrate would there be in 2.5 L of the stream.

Explanation:

The ppm is the amount of solute (in milligrams) present in kilogram of a solvent. It is also known as parts-per million.

To calculate the ppm of oxygen in sea water, we use the equation:

$\text{ppm}=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 10^6$

Both the masses are in grams.

We are given:

The ppm concentration of nitrates = 3.0 ppm

Mass of nitrates = x

Mass of steam= m

Volume of steam = V = 2.5 L = 2500 ml ( 1 L = 1000 mL)

Density of steam = d = 1.0 g/mL

$M=d\times V=1.0 g/mL\times 2500 mL = 2500 g$

Putting values in above equation, we get:

$3.0=\frac{x}{2500 g}\times 10^6$

$x=0.0075 g$

Mass of nitrate = 0.0075 g

Moles of nitrate = $\frac{0.0075 g}{62 g/mol}=0.0001210 mol$

1 mole of nitrate ion is present in 1 mole of sodium nitrate.

Then 0.0001210 moles of nitrate will be present in :

$\frac{1}{1}\times 0.0001210 mol=0.0001210 mol$ of sodium nitrate;

Mass of 0.0001210 moles of sodium nitrate :

0.0001210 mol × 85 g/mol = 0.01028 g

0.01028 grams of sodium nitrate would there be in 2.5 L of the stream.

6 0

4 years ago