<h3><u>Answer;</u></h3>
= 1.183 × 10^25 atoms
<h3><u>Explanation;</u></h3>
Volume of a cylinder is given by the formula;
πr²h , where r is the radius, and h is the height or length.
Volume = 3.14 × 2.5² × 10
= 196.25 cm³
But density = 2.7 g/cm³
Therefore;
Mass = volume × density
= 196.25 × 2.7
= 529.875 g
But; 1 atom = 4.48 x 10-23 g
Therefore;
Number of atoms = 529.875 g / 4.48 x 10-23 g
<u>= 1.183 × 10^25 atoms</u>
Hey there! Hello!
The best answer I can give to you is that it depends. It depends on the way that the volume is being increased and if it's being increased along with the mass.
Volume represents the amount of space a substance, object, etc. takes up. Density represents the amount mass found in a given measurement of volume. Taking these definitions into account, we can see that volume directly correlates with the measurement of density.
Think of two buckets, one with one gallon of a substance and the other with two gallons of a substance. Both samples of the substance will have the same density, since mass was being added in addition to volume. Take a look at the example:
Bucket 1:
Mass of Substance = 1kg
Volume of Substance = 3cm^3
Density of Substance= 1/3 kg/cm^3
Bucket 2:
Mass of Substance = 3kg
Volume of Substance = 6cm^3
Density of Substance= 3/6 kg/cm^3 = 1/3 kg/cm^3
If we simply add substance, the mass and volume will increase together at a fixed rate, meaning that the most simplified version of the density fraction will always be the same.
But there's another part to this. You can increase or decrease the temperature of a sample, making volume increase/decrease and the mass stay the same. When you evaporate water, it turns to steam, which takes up much more space than it did as water. But nothing has been created or destroyed, so the mass stays the same. This would make the density change along with the volume.
I hope this helped you out! Feel free to ask me any additional questions if you need further clarification. :-)
Answer: The heat of combustion per gram of the material is 53.5 kJ
Explanation:
Let the heat released during reaction be q.
= Heat gained by calorimeter
Heat capacity of bomb calorimeter ,C = 38.29 kJ/°C
Change in temperature = ΔT = (27.04-23.61) °C = 3.43 °C
Total heat released during reaction is equal to total heat gained by bomb calorimeter.
Thus 2.455 g of material releases 131.3 kJ of heat
1 g of material releases = of heat
Thus the heat of combustion per gram of the material is 53.5 kJ
Answer:
Explanation:
i. From solid to liquid (melting)
For melting to occur, heat must be absorbed by the substance being melted. When the substance gains significant amount of heat, its particles begins to vibrate and move on top of one another.
ii. From liquid to solid (freezing or hardening)
In this phase change, heat is removed from the system. This allows for the molecules to lose their kinetic energies and form an ordered arrangement from their liquid or molten state.
iii. From liquid to gas (evaporation)
As randomness continues to increase, more heat is absorbed to break the attractive forces between molecules of liquids. Phase change from liquid to gas is a heat absorbing process.
iv. From gas to liquid (condensation)
In condensation, heat is lost by a substance. To condense or collect gas particles together, heat must be removed from the system. This allows for a diminished kinetic energy among the particles of the system.
Answer:
The particles of the liquid slide around faster as the kinetic energy of the particles increases.
Explanation:
After all the bonds in the solid state are broken in part CD, the more free particles in the liquid state gain more kinetic energy with increase in energy supplied.
The increase in kinetic energy is indicated by the temperature increase thus the positive gradient of the part CD.
Kinetic energy means more vibrations thus the particles slide more and more against each other.