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Wewaii [24]
3 years ago
15

Which is a statement of cell theory? All cells are made up of living molecules. All plants are made of cells. All animals are ma

de of cells. All cells are produced from other cells.
Chemistry
1 answer:
erastovalidia [21]3 years ago
4 0

Answer:

all cells are produced from other preexisting cells through cell division

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How many grams are in 1.25 moles of Potassium hydroxide, KOH?<br><br>1 point​
klasskru [66]

Answer:

There are 70 grams of KOH

Explanation:

First, we calculate the weight of 1 mol of KOH:

Weight 1 mol KOH: Weight K + Weight 0 + Weight H=  39g+ 1g+ 16g= 56 g/mol

1 mol-------56 g KOH

1,25 mol----x= (1,25 molx56 g KOH)/1 mol= <em>70 g KOH</em>

7 0
3 years ago
The isotope Np-238 has a half life of 2.0 days if 96 grams of it were present on Monday how much will remain six days later
Neporo4naja [7]

Answer:

12 grams

Explanation:

For any radioactive substance

the amount of substance left after n half life  is given by = x/2^n

where x the original amount of substance.

____________________________________________

Half life of isotope Np-238 = 2 days

total no of days = 6

no of half life =total no of days/Half life of isotope Np-238 = 6/2 = 3

thus,

for our problem n = 3

initial amount of Np-238 = 96 grams

thus,

the amount of substance left after 3 half life = 96/2^3 = 96/8 = 12 grams.

Thus, 12 grams will be left after six days.

4 0
3 years ago
Aspartame, phenylalanine, and aspartic acid were examined by thin‑layer chromatography (TLC) using ninhydrin as the visualizatio
Marizza181 [45]

Answer:

Explanation:

The following precautions should be followed for a safe and efficient laboratory environment:

The TLC plate should be laid on a paper towel, to ease picking it from the bench top.

The used TLC spotters and the used TLC plates in the appropriate waste containers provided for this purpose should be placed in the blood.

Spills should be cleaned up and contaminated surfaces should be washed with water.

The pipette and/or glassware should be rinsed again with the distilled water, in case there is the slightest doubt about the contamination.

Everything used should be washed with distilled water, including the pipettes.

4 0
3 years ago
What is the density of an object with a mass of 53.7 g and a volume of 27.19 ml?
11111nata11111 [884]
The density is 158.2
3 0
2 years ago
Perform the following
Sati [7]

Answer:

35.05152

Explanation:

3 0
2 years ago
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