Food chewed by teeth breaks into small pieces, and is mixed with saliva during chewing.
<span>It is very important to wash the cupric hydroxide intermediate in the synthesis of cupric acetate because most copper hydroxide can slowly turn from blue to black due to the formation of copper(II) oxide. If you do not wash the cupric hydroxide then the precipitate will be very difficult to filter out the solution.</span>
Answer:
Experimentation
Explanation:
Experimentation are practical activities carried out in a controlled way of asking and answering unbiased questions, support or refute a tentative answer (hypothesis). Experimentation is a process in scientific method in which one or more variables are consciously manipulated and the effect of that manipulation on other variables is observed. The variable which is being manipulated by the researcher is said to be the independent variable while the dependent variable is the change in behavior measured by the researcher.
<span>Gram-negative bacteria have a cell wall that is <u>thin</u> and does not accept the stain, making it appear <u>red or pink</u><u />.
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</u>Gram staining is used for differentiation gram-positive from gram-negative bacteria based on the characteristic of their cell wall. Gram-negative bacteria have a thinner cell wall than gram-positive bacteria. In this staining, bacteria are first stained with crystal violet dye. Only gram-positive bacteria will be violet colored because they can retain the dye thanks to their cell wall. The second staining with fuchsine or safranin will give the red or pink color to the gram-negative bacteria. <u>
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