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4 years ago

What were the results on Rutherford's goldfoil experiment

Chemistry

1 answer:

diamong [38]4 years ago

4 0

Answer:

Explanation:

The relative massive alpha particles could go through the gold foil without being deviated of their trajectory or only small deviations due to the uniformity distribution positive charge of the protons.

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What’s 25mg in grams

Aliun [14]

1 gram = 1000 mg

1 mg = 1/1000 g

25 mg = 25* (1/1000) g = 25/1000 g = 0.025g

3 0

3 years ago

A 8.06 g piece of solid CO 2 is allowed to sublime in a balloon. The final volume of the balloon is 1.00 L at 300.0 K. What is t

natka813 [3]

Answer:

The pressure of the gas is 4.428 atm.

Explanation:

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

Considering a certain amount of ideal gas confined in a container where the pressure, volume and temperature can vary, but keeping the mass constant, that is, without altering the number of moles, the pressure, P, the temperature can be related, T and the volume, V, of an ideal gas using the ideal gas law:

P*V = n*R*T

where R is the ideal gas constant, and n is the number of moles of the gas.

In this case, to know n you must know the molar mass of the CO₂ compound. Being:

C: 12 g/mole
O: 16 g/mole

then, the molar mass of CO₂ is: 12 g/mole + 2*16 g/mole= 44 g/mole

Then you apply a rule of three: if 44 grams of CO₂ are present in 1 mole, 8.06 grams in how many moles are they?

$moles of CO_{2} =\frac{8.06 grams*1 mole}{44 grams}$

moles of CO₂= 0.18 moles

Then, you know:

P: ?
V: 1 L
n: 0.18 moles

R= 0.082 $\frac{atm*L}{mol*K}$

T= 300 K

Replacing in the equation of the ideal gas law:

P* 1 L= 0.18 moles* 0.082 $\frac{atm*L}{mol*K}$ * 300 K

Solving:

$P=\frac{0.18 moles* 0.082 \frac{atm*L}{mol*K} *300 K}{1 L}$

P= 4.428 atm

<u><em>The pressure of the gas is 4.428 atm.</em></u>

3 0

3 years ago

Help calculating molar mass

Irina-Kira [14]

Molar mass can be determined by adding the atomic masses of each individual element, depending on how many times they appear. You can find how many times they appear by looking at their respective subscripts. Atomic masses of each element can be found on the periodic table.

For example, in #1

Multiply the mass of Lithium (6.941) by 4, because there are 4 lithium molecules.

Multiple the mass of Phosphorus (30.974) by 2 because there are 2 Phosphorus molecules.

And multiply the mass of oxygen (15.999) by 7 because there are 7 oxygen molecules.

After you have those values, add them together to find the total molar mass of the compound.

7 0

3 years ago

If solid water is dropped into liquid water, will the solid iron sink or float?

vivado [14]

Answer:

And this expansion makes ice is less dense than liquid water, which means that ice floats! ... If you drop a piece of solid iron into liquid or molten iron, it will sink before it melts.

Explanation:

6 0

3 years ago

Read 2 more answers

Please Help Me!!

Cerrena [4.2K]

Answer:

1. Galvanic oxidation. Example is the corrosion of aluminium wires when in contact with copper wires under wet conditions.

2. Rainwater or Damp/moist air

3. Chromium-plated steel screws or stainless steel screws or galvanized steel screws

Explanation:

1. Galvanic oxidation or corrosion occurs when two different metals with different electrode potentials are brought into contact with each other by means of an electrolyte (usually a aqueous solution), such that a redox reaction occurs leading to one metal with the more negative electrode potential (the anode) becoming oxidized, while the other less negative potential (the cathode) is reduced.

In order for galvanic corrosion to occur, three elements are required.

i. Two metals with different corrosion potentials (anode and cathode)

ii. Direct metal-to-metal electrical contact

iii. A conductive electrolyte solution (e.g. water) must connect the two metals on a regular basis.

For example oxidation (corrosion) of aluminium wires when in contact with copper wire under wet conditions.

2. The most likely electrolyte will be rainwater containing dissoved solutes (if the panel is in an exposed part of the house) or damp/moist air.

3. From the table, the most likely screw will be chromium-plated steel screws or stainless steel (made of iron and nickel) screws or galvanized steel (zinc-plated) screws.

All these possible screw components have a more negative electrode potential than copper. Thus they will serve as the anode in a galvanic oxidation with copper.

3 0

3 years ago