Answer: The predicted change in the boiling point of water is Δt = 0.0148 °C
Solution:
We will use the equation for boiling point elevation Δt
Δt = i Kb m
where the van't Hoff Factor i is equal to 3 since one molecule of barium chloride in aqueous solution will produce one Ba2+ ion and two Cl- ions. The molality m of the solution of 4.00 g of barium chloride dissolved in 2.00 kg of water can be calculated using the molar mass of barium chloride:
m = [4.00g BaCl2 * (1 mol BaCl2 / 208.233g BaCl2)] / 2.00kg H2O
= 0.009605 mol/kg
Therefore, the amount Δt the boiling point increases is
Δt = i Kb m
= (3) (0.512 °C·kg/mol) (0.009605 mol/kg)
= 0.0148 °C
We can also find the new boiling point T for the solution since we know that pure water boils at 100 °C:
Δt = T - 100°C T = Δt + 100°C = 0.0148 °C + 100°C = 100.0148°C
Answer: B Hope this helps :)
One material property that is widely used and recognized is the strength of a material. But what does the word "strength" mean? "Strength" can have many meanings, so let us take a closer look at what is meant by the strength of a material. We will look at a very easy experiment that provides lots of information about the strength or the mechanical behavior of a material, called the tensile test.
The basic idea of a tensile test is to place a sample of a material between two fixtures called "grips" which clamp the material. The material has known dimensions, like length and cross-sectional area. We then begin to apply weight to the material gripped at one end while the other end is fixed. We keep increasing the weight (often called the load or force) while at the same time measuring the change in length of the sample.
Explanation:
No. A voltage reading is a result of a difference in cell potential of the cells. Even if you added the volume, it would still not affect because what matters is the concentration of the ions which give the potential gradient. All you did was add the quantity in terms of volume but the substance in it is still the same.
Answer: Option (c) is the correct answer.
Explanation:
Thermal conductivity is defined as the ability of a substance to transfer heat.
Also, it is known that metals are good conductors of heat and electricity. Therefore, they show high thermal conductivity.
Whereas non-metals are bad conductors of heat and electricity. Hence, they have poor thermal conductivity. Therefore, antimony and carbon will have less thermal conductivity.
On the other hand, thermal conductivity value of sodium is 140 W/(m k) and gallium is 29 W/(m k).
Thus, we can conclude that out of the given options sodium element is likely to have the highest thermal conductivity.
4. Hybrid... because it’s plant breeding