Answer: Average speed for the first two hours was 70 km/hr
Covered 400 km in the last four hours
Average speed for the rest of the journey was 100 km/hr
Explanation: 140 km / 2 hours = 70 km/hr
540 km - 140 km = 400 km remaining for the last four hours
400 km / 4 hours = 100 km/hr for the last four hours
Calculate the approximate initial boiling point (in oC) of a solution of 285 g of
magnesium chloride in 2.0 kg of water. The kb of water is (0.52°C/m)
Answer:
do u take links bcs I can give u one with the answer?
The approximate initial boiling point of Magnesium chloride solution has been 102.33 degree Celsius.
The pure water has boiling point 100 degree Celsius. With the addition of the solvent, the boiling point has been increased. The change in the boiling point ([tex]\Delta T_b[/tex]) has been given as:
[tex]\Delta T_b=i.K_b.b[/tex]
Where, i has been the van't Hoff factor
[tex]K_b[/tex] has been the ebullioscopic constant
b has been the molality of the sample
The dissolution of magnesium chloride in water has been given as:
[tex]\rm MgCl_2\;(aq)\;\rightarrow\;Mg^2^+\;+\;2\;Cl^-[/tex]
The i has been the amount of molecules that has been formed by the dissociation of 1 molecule. The dissociation of Magnesium chloride has been resulted in the 1 Mg and 2 Cl. Thus, the i for Magnesium chloride has been 3.
The molality (m) of the solution has been given as:
[tex]m = \dfrac{m_s_o_l_u_t_e}{mwt}\;\times\;\dfrac{1000}{m_s_o_l_v_e_n_t}[/tex]
Where, [tex]m_s_o_l_u_t_e=285\;\text {g}\\m_s_o_l_v_e_n_t=2\;\text{kg}\\mwt=95.211\;\text{g/mol}[/tex]
Substituting the values, molality of the Magnesium chloride solution (b) can be given as:
[tex]b=\dfrac{285}{95.211}\;\times\;\dfrac{1}{2}\;\text{m}\\b=1.49\;\text{m}[/tex]
The molality of the solution has been 1.49 m.
Substituting the values for change in temperature:
[tex]\Delta T_b=3\;\times\;0.52\;\times\;1.49\;^\circ \text C\\\Delta T_b=2.33\;^\circ \text C[/tex]
The rise in boiling temperature with the addition of 285 g of Magnesium chloride has been 2.33 [tex]\rm ^\circ C[/tex]. Since, the initial temperature for pure solvent has been 100 degree Celsius.
The initial temperature of Magnesium chloride solution has been the sum of two. Thus:
[tex]\text {Initial temperature}=100^\circ \text C\;+\;2.33\;^\circ \text C\\\rm Initial\;temperature=102.33\;^\circ C[/tex]
The initial temperature of magnesium chloride solution has been 102.33 degree Celsius.
For more information about the boiling point, refer to the link:
https://brainly.com/question/2153588
The slate tabletops in the schools science lab are made from rocks that were under very high temperature and pressure. In which category of rock can slate be placed?
A. Igneous
B. metamorphic
C. sedimentary
D. volcanic
Answer:
B. metamorphic
Explanation:
Rocks formed under high heat and pressure is essentially the definition of metamorphic rock :)
What is a wind turbine used for?
Please help
Answer:
it used to generate mechanical power or electricity
Two
moin tunetons of carbohydraus
Answer:
Carbohydrates can be divided into two main types: simple and complex. Simple carbohydrates are made up of just one or two sugar units, whereas complex carbohydrates are made up of many sugar units.
Which of the following is a product in the reaction described by the word equation below?
iron + copper(II) sulfate ----------> iron(II) sulfate +copper
Answer:
Please answer my question
Explain the difference, with sketches, between the titration curves of monoprotic acid and a triprotic acid.
Answer:
A monoprotic acid has only one equivalence point in a titration curve while a triprotic acid has three equivalence points.
Explanation:
Monoprotic acids, HA, are acids that are able to donate one proton per molecule during the process of ionization or dissociation as shown below:
HA ----> H⁺ + A⁻
A triprotic acid is a polyproprotic acid, that is acids that can donate more than one proton per molecule during ionization. a triprotic acid can donate three protons per molecule during the process of ionization. The dissociation of a triprotic acid is shown below;
H₃A -----> H₂A⁻ + H⁺
H₂A⁻ ----> HA²⁻ + H⁺
HA²⁻ -----> A³⁻ + H⁺
The value Ka, is known as the acid dissociation constant. It is found by looking at the equilibrium constant for the dissociation of the acid. The higher the Ka, the more the acid dissociates
A titration curve is the plot of the pH of the analyte solution versus the volume of the titrant added as the titration progresses.
In a titration curve in which base is added to acid, the pH rises slowly until the equivalent point at which point the pH remains constant before it begins to rise again on the addition of more base.
In a titration curve of a monoprotic acid, there is only one region in which the equivalence point is obtained corresponding to the point of acid of dissociation of all its protons.
In the titration curve of a triproprotic acid, three equivalent points are obtained corresponding to the point of dissociation of each of three protons of the triprotic acid.
The titration curves are shown below
What is the answer:
C4H8+H2=
whoever can help me will get the brainliest! Please
Answer:
Food chain, in ecology, the sequence of transfers of matter and energy in the form of food from organism to organism. Food chains intertwine locally into a food web because most organisms consume more than one type of animal or plant. ... In a predator chain, a plant-eating animal is eaten by a flesh-eating animal.
Explanation:
compare the wavelengths of different colors to explain why the flashing light color used in airplanes or at the top of the buildings is the red color *
2. (1:25) How much does the moon pull on the Earth?
A. More than the Earth's pull on the moon
B. Less than the Earth's pull on the moon
C. Equal to the Earth's pull on the moon
Answer:
a. more than the earth pull on the moon sorry if false
Convection currents in Earth's core transfer heat and material to the surface.
True or False?
Answer: False
Explanation: The plate tectonics move due to convection currents of the mantle; the cooler upper mantle descends while the hotter lower mantles ascend. The heat that drives these convection currents emanated from the core of the earth (not the sun).
what provides support and transportation of materials for a plant
Answer: Xylem is the tissue responsible for supporting the plant as well as for the storage and long-distance transport of water and nutrients, including the transfer of water-soluble growth factors from the organs of synthesis to the target organs.
Explanation:
Answer:
Xylem is the tissue responsible for supporting the plant as well as for the storage and long-distance transport of water and nutrients, including the transfer of water-soluble growth factors from the organs of synthesis to the target organs
Explanation:
Plz helpppp^^^^^^^^^^
Which of the following pH values is the most acidic? *
a. 1
b. 3
c. 5
d. 14
7. Some of the following sublevels do not exist. Cross out the ones that are not real.
1s 3d 4p 2d 3f 5s 6p 1p 2s 5g 4f 1f
Answer:
1f 3f 5g 1p 2d
Explanation:
There is only 4f and 5f orbitals.
G is not an orbital.
P orbital starts with 2p
D orbital starts with 3d
You have 54.32 grams of PbCl4. How many moles of PbCl4 do you have?
If you show the work that would be great!
Lodestone is magnetic. How might you identify weather a mineral sample might be lodestone
A. By examining how it bends
B. By determining if it contracts electricity
C. By determining if it glows under ultraviolet light
D. By determining if it attracts metal objects
Answer: D
Explanation:
helppppppppppppppppppppppp
ITS CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
choose the correct answer.
1 attac
Which substance will not conduct electricity?
A aluminium
B copper
C plastic
D steel
ОА. А
Explanation:
Covalent compounds (solid, liquid, solution) do not conduct electricity. Metal elements and carbon (graphite) are conductors of electricity but non-metal elements are insulators of electricity. Ionic bonds are the electrostatic attraction between positive and negative ions.
Hope its useful... :-)
Brainliest plz
Which solubility curve on the right best represents the data table on the left?
DO NE
Solubility of Sugar in Water
Solubility of Sugar in Water
300
Temperature
(°C)
Sugar Dissolved
(grams)
250
200
0
89
150
Sugar per 100g H20
30
110
100
144
50
60
0
0
90
208
100
20 40 60 80
Temperature (°C)
Answer: Blue curve
Answer:
blue curve on edge :)
Explanation:
Select odd one out.
I) O
II) Na
III) Cu
IV) Ag
Explanation:
0 is the odd one...............
and rest are metals and they lose electron and 0 gain electron and is non metal
At which position on the diagram would an apple have the greatest potential energy?
Answer:
Position 1 because it is the highest from the ground.
Hope this helps!
If 45 grams of NaNO3 is dissolved in 100 grams of water at 40 C, how much more is needed to have a saturated solution?
Answer:
I literally have no idea
What are the concentrations of sugar
1. Which one does not belong the the group?" helium iodine radon or krypton
Answer:
Iodine
Explanation:
Helium, Radon, and Krypton are all in group 18 but Iodine is not
(it's in group 17)
:)
what is the molecular shape of N2O2?
Answer:
If you're just looking at the Lewis Structure from the perspective of the octet rule, it does appear that the structure is correct. Dinitrogen always has a lone pair of electrons which could conceivably be used for dative bonding as you suggest. So from that perspective there appears to be nothing wrong at all - other than that it doesn't exist in nature in this way.
Explanation:
Which of following is true of liquids?
Group of answer choices
The particles move at a high rate of speed
The particles have a medium amount of kinetic energy and slide past one another.
The particles vibrate in place.
The particles have a fixed volume and shape
Answer:
The particles have a medium amount of kinetic energy and slide past one another
Explanation:
If particles move at a high rate of speed its gas, and if they vibrate in place and they have a fixed volume and shape its probably a solid. So a medium amount of kinetic enery is correct.
How many Na atoms are shown in the products?
Answer: 6.02214179×1023 atoms
Explanation: I think so
which substances corrode copper?
Help me please!
Main-block transition metals, such as iron, make good building materials for all of the following reasons EXCEPT____.
A. Resistance to corrosion
B. Insulation
C. Strength
D. High density