Answer:
The staining process will dye them purple (option C)
Explanation:
Gram staining is a method of staining used to distinguish and classify bacterial species into two large groups. Those 2 groups are called Gram- positive and gram - negative groups.
This staining is based on the composition of their cell wall. Gram staining uses crystal violet to stain cell walls, iodine as a mordant, and a fuchsin or safranin counterstain to mark all bacteria.
⇒ Gram- positive bacteria are called gram - positive because they will give a positive result. This according to their cell wand. Their cell wall is typically rich with peptidoglycan and lacks the secondary membrane and lipopolysaccharide layer found in Gram-negative bacteria
Gram- positive bacteria take up the crystal violet stain used in the test, and then appear to be purple-coloured.
⇒ Gram- negative bacteria are called gram - negative because they will give a negative gram result.
Because of the presence of higher lipid content, after the alcohol-treatment, the porosity of the cell wall increases, hence the CVI complex (crystal violet – iodine) can pass through. Thus, the primary stain (crystal violet) is not retained. Gram negative bacteria will appear red or pink.
Yogurt is produced using a culture of Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus bacteria. (In addition, other lactobacilli and bifidobacteria). All of those bacteria are gram-positive, what means they will appear <u>purple.</u>
Answer: 6.2 moles
Explanation:
C3H8(g) + 5O2(g) ---> 3CO2(g) + 4H2O(g)
The balanced equation above shows the combustion of propane, C3H8 in oxygen, O2 to yield carbon dioxide, CO2 and water, H2O
The mole ratio of combustion are as follows:
1 mole of C3H8 react to produce 4 moles of H2O
1.55 mole of C3H8 will react to produce Z moles of H2O
To get the value of Z, cross multiply
Z x 1 mole = 1.55 mole x 4 mole
Z = 6.2 moles
Thus, 6.2 moles of water will be produced from 1.55 moles of propane
Answer:
a) 2.91%
b) 90.5 grams
Explanation:
Mass percentage is
mass%=
a) the mass of NaCl = 1.50g
The mass of water = 50.0 g
Total mass =1.5+50=51.50 g
mass% = 
%
b) the mass percent of NaOCl = 3.62 %
It means the mass of NaOCl in 100g of bleaching solution 3.62 g
so mass of NaOCl in 2.50kg = 0.0905 kg = 90.5g
