<span>Wrap a magnet in plastic lunch wrap and move it through the mixture of the three solids. The iron filings will stick to the magnet. The filings can be removed by unwrapping the plastic from the magnet carefully! Mix the remaining salt and sand in water and stir.</span>
Answer:
B. pour the reagent into a small beaker before using it
Explanation:
Let's explore all the mentioned practice
A. Leftover reagents should not be discarded in the sink but discarded according to the disposal method present in the safety data sheet (SDS) of the chemical.
B. Reagents should be poured in a clean beaker for use to avoid contamination in the original reagent bottle
C. This is not a good practice, as the plastic pipet tends to contain some impurity in its tip.
D. This is also a bad practice. Firstly, a reagent should be taken according to the need. If there is leftover, it should be discarded as it most probably contains contamination in it
Explanation:
There is variety of evidence that supports the claims that plate tectonics accounts for
(1) the distribution of fossils on different continents
,(2) the occurrence of earthquakes, and
(3) continental and ocean floor features including mountains, volcanoes, faults, and trenches.
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Answer:
Explanation:
The bottom picture shows a Mg atom. There are two electrons on the outside ring. When Mg reacts with something, these 2 electrons are given away. The top picture records that fact.
Answer:
When an empty pot sits on the heating element in a restaurant coffee machine it can get very hot.
Explanation:
