"The chemicals dissolve the cell wall"
(PLATO)
Swag~
To keep the balance clean and to keep chemicals from mixing with other chemicals. Also some chemicals can react with the metal of the balance pan and cause it to corrode or rust. Always use weighing paper or a small dish or beaker to weigh out chemicals.
Electroplating is a chemical change. Solutions containing metal ions are placed in a tank, and the piece of metal to be plated is connected to the electrical supply to become the cathode. The metal ions in solution are attracted to the cathode where they are reduced (reduction is gain of electrons) to form a metal coating.
The indicators which change color is litmus paper strips.
It won't change, it is already red (coke is acid).
The liquid in thermometers contracts when placed in something cold (and expands when placed in something hot.)
To keep the balance clean and to keep chemicals from mixing with other chemicals. Also some chemicals can react with the metal of the balance pan and cause it to corrode or rust. Always use weighing paper or a small dish or beaker to weigh out chemicals.
Actinides
It is used for Science experiments using chemicals. The dents in the spotting tile are where the chemicals are placed for examination.
i am pretty sure that the regulations have succeeded in reducing ozone damage as studies show that the ozone holes are becoming smaller
Because they discovered that certain chemicals mixed with each other placed on certain media can create a copy of what's in front of that certain media, but they had to invent a whole series of machinery to perfect this chemical reaction to the point where it is actually called photography, and the product, a photograph. Hope this helped.
Certain indicators only change colour when placed in a particular pH level or range (e.g. litmus) and others are colourless in certain conditions (e.g. phenolphthalein, leuchomalachite green's second transition).
in pure water a cell will become turgid and water will flow in through osmosis.
What a bio-hazard safety does is keep hazardous chemicals from escaping into the air. If any of the chemicals placed in a bio-hazard safety cabinet were to escape into the air, it could be deadly to anyone who inhales said chemicals.
Mechanical change
They don't "change to stone". If placed under a gentle inlet in the right atmospheric conditions, they become coated with calcite that has been dissolved from the limestone above by the ground-water feeding the inlet. So no "change", just coating.
Pharaohs thrones were placed in their tombs so that they could become a ruler in the afterlife.
"conduction"