Options are provided in the given question, so the complete question is as follows:
Laboratory equipment is cleaned and properly stored after use primarily so that —
A. chemical products can be measured and recorded as data
B. time is saved in setting up the next experiment
C. toxic materials can be kept in the laboratory
D. the possibility of contamination in the laboratory is minimized
Answer:
D. the possibility of contamination in the laboratory is minimized
Explanation:
After the completion of experiments, all the laboratory equipment should be cleaned and properly stored to minimize the possibility of contamination in the laboratory.
Any contamination in the laboratory can affect the experiment and will not give an accurate result, so it is important to clean and store the equipment properly.
Hence, the correct answer is "D".
In 100.0g of sucrose there are 42.1 g of carbon.
C-12 and C-13 are isotopes of the element carbon. Since they are both of the same element, they have the same number of protons. The number that follows the C indicates the number of neutrons. Isotopes are variations of the element with different number of neutrons. C-12 shows that that variation of carbon has 6 protons and 6 neutrons for a total mass of 12. C-13 shows that it has 6 protons but 7 neutrons for a total mass of 13
Explanation:
First, we will calculate the number of moles of HF as follows.
No. of moles of HF = volume × concentration of HF
=
= 1.78 mol
According to Henderson-Hasselbalch equation,
pH =
=
Since, no change in the volume is taking place. Hence, putting the given values into the above formula as follows.
pH =
= 0.208
= 1.614
moles of NaF = 2.87 mol
Thus, we can conclude that moles of solid NaF present are 2.87 mol.
Explanation:
The source of energy in nuclear weapons is to make the weapons god and make them nice and strong but I dont know so thanks for the points