Chemistry, 07.07.2019 15:30 reagan1514

Me which picture shows straining i think it's b f d which picture shows filter paper being used i think c which picture shows pieces of iron being separated i think e which picture show dissolving i think a which picture shows evaporation i think d can you check if im right i only have 8 minutes until the bus comesss sooo hurryyy

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Which picture shows straining I think it's B F D
False, the answer is B, C, F
Straining or filtering is a method to separate bigger things using a smaller hole to filter it. In picture B and F, the spaghetti and tea leaves are separated from water by using a filter with a smaller hole than the spaghetti or tea leaves. The filter for spaghetti won't works for tea leaves as the filter hole is bigger than tea leaves. The same principle work with filter paper on picture C. The paper also has holes, but it too small for you to see.

Which picture shows filter paper being used I think C
True, The filter paper is used to filter a solution from it solvent, which probably water. The picture C is correct because you try to separate the muddy water into clear water. Picture F is also filtering but not using paper.

Which picture shows pieces of iron being separated I think E
True, It should be E. The easiest way to separate iron is by using a magnet. In the picture, there is U shaped magnet that will attract iron but will leave non-metal fragment.

Which picture show dissolving I think A
True, the picture A showing someone dissolving sugar and sand(solute) into water(solvent). Sugar will make a homogenous solution, but sand will only make colloid which was easily separated with water.

which picture shows evaporation I think D
True, in picture D the water evaporates leaving the salt. This was the techniques used for producing salt from seawater. Water can evaporate, changing its form from liquid into gas. In this case, the water as the solvent will be continuously reduced, make the salt concentration become higher until saturated and become precipitated. After all of the water evaporates, only the salt will remain.

Answer from: michaeldragon9663

Figure A depicts dissolution, B and F depict straining. Figure C depicts the use of filter paper. Figure D shows the evaporation process. Figure E shows separation with the help of a magnet.

Explanation:

The techniques mentioned in the images are separation techniques.

Straining is the separation process in which the particles are separated on the basis of size with the help of a filter. The filter will set the cut-off value and the particles are separated.

In Figure B with the help of a strainer, the water from the spaghetti is removed. So figure B possesses straining.

In figure F the tea leaves are separated from the tea with a strainer. Thus Figure F also depicts the straining technique.

The use of filter paper is made to differentiate the particles of very small size. In figure C, filter paper is used to separate the solute in the solution.

The separation of iron is made with the use of a magnet. Magnet has the ability to attract iron towards it.

In figure E, iron nails are being separated with the help of a magnet.

Dissolving is the process of making two solutes miscible in a solution. In figure A, sugar was made to dissolve in water making a miscible solution. Sand is allowed to dissolve in water making an immiscible solution.

Evaporation is the process of converting liquid to vapor form.

Figure D posses the evaporation process in which water is evaporated in the form of vapor, leaving the salt behind.

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Answer from: Quest

Where is the graph ?

Answer from: Quest

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).