1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
sergeinik [125]
3 years ago
7

Read the descriptions below of two substances and an experiment on each. Decide whether the result of the experiment tells you t

he substance is a pure substance or a mixture, if you can .
Sample A is 100.mL of a clear liquid. The density of the liquid is measured, and turns out to be 0.77/gmL. The liquid is then heated in a flask until it boils. The vapor that rises off the boiling liquid is collected for 10 minutes and cooled until it condenses into a separate beaker. The density of the liquid that remains in the flask is then measured, and turns out to be 1.04/gmL.

Sample B is 100.g of a coarse grey powder with a faint unpleasant smell. 15.g of the powder are dissolved in ethanol. 0.5mg of the resulting black solution is carefully dropped onto a thick sheet of paper laid flat in a tray. After 30 minutes the initial round black stain has spread out and faded in color to a deep purple. Additionally, there is a dark green ring surrounding the inner stain.

a. Is sample A made from a pure substance or a mixture?
b. If the description of the substance and the outcome of the experiment isn't enough to decide, choose "can't decide.
c. Is sample B made from a pure substance or a mixture?
d. If the description Of the substance and the outcome of the experiment isn't enough to decide, Choose "can't decide.
Chemistry
1 answer:
Phantasy [73]3 years ago
7 0

Answer:

Samples A and B are mixtures

Explanation:

For sample A, we were told that the initial density of the solution is 0.77/gmL. After distillation, the liquid left has a density of 1.04/gmL. Apparently, A is a mixture of liquids.

As for sample B, the spread of the chromatogram resulting in different colours show that the sample B is not pure. It is a mixture of substances. A pure sample will yield only a single spot.

You might be interested in
1 point Berny has a 0.15-kilogram candle, a 1.00-kilogram jar, and a 0.25-kilogram candle holder. He places the candle and candl
evablogger [386]

Answer:

1.40

Explanation:

Study Island

5 0
3 years ago
Object A has a temperature of 287 Kelvin, object B has a temperature of 374 Kelvin. In what direction will thermal energy flow?
Mashcka [7]
Thermal energy will flow from an object high temperature to an object of low one. In this case, the thermal energy will flow from object B to object A.
6 0
3 years ago
Read 2 more answers
When an object accelerates, what about the motion changes
Tems11 [23]

Answer:

An object which experiences either a change in the magnitude or the direction of the velocity vector can be said to be accelerating. This explains why an object moving in a circle at constant speed can be said to accelerate - the direction of the velocity changes.

Explanation:

6 0
3 years ago
Calculate the frequency of light having wavelength of 456 nm.
Lubov Fominskaja [6]

Answer:

Calculate the frequency of light having wavelength of 456 nm.

1.22*10^8nm

Explanation:

7 0
2 years ago
A _____ forecasts the weather using data collected from many sources.
Sav [38]
Meteorologist.............................
7 0
4 years ago
Other questions:
  • Which of the following elements would be likely to form an anion?
    9·1 answer
  • When aluminum is combined with oxygen, aluminum oxide is formed. The rearrangement of the atoms involved is an example of what?
    6·2 answers
  • At 20 ?C the vapor pressure of benzene (C6H6)is 75 torr, and that of toluene (C7H8) is 22 torr
    13·1 answer
  • These macromolecules are unique in that they are not composed of monomers, but instead resemble "hairpins" with fatty acid tails
    15·2 answers
  • What makes iron a pure substance ?​
    5·1 answer
  • The specific heat capacity of graphite is 0.71 J/g°C. Calculate the energy required to raise the temperature of 750 g of graphit
    5·2 answers
  • Plz i need help please help​
    9·2 answers
  • Which proccess do NOT build mountains
    6·1 answer
  • . Elements in the Periodic Table are arranged according to increasing numbers of _____________, which is called the ___________
    6·1 answer
  • What is the conversion factor for in^3 to cm^3
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!