Answer: Alcohol and water in the solution have different boiling points.
Explanation: The substance that has a lower boiling point evaporates faster. For this case alcohol has a lower boiling point than water so it evaporates in a faster rate. This process of distillation separates alcohol and water in a solution.
Answer:
The volume of the sample given is 850 ml, the density given is 0.79 gram per cm. Now the weight of the sample will be,
Weight = volume × density = 850 × 0.79
= 671.5 grams
Weight of the suspended solids given is 0.001 gram
The concentration of the sample can be determined by using the formula,
Concentration = wt. of sample/volume
= [671.5 - 0.001) 10³ mg / 0.85 L
= 789998.82 mg/L or 789998.82 ppm
Now the concentration of suspended solids is.
Css = 0.001 × 10³ mg / 0.85 L = 1.1764 mg per L or 1.1764 ppm
B) magnetic pole.
Explanation:
The magnetic pole is the area around a magnet where magnetic effect is the strongest.
Around a magnet, there is a force field in which the effect of magnet is felt.
- The strongest intensity of the force is felt at the pole.
- The magnetic force field leaves the north pole and enters through the south.
- Magnetic materials and magnets are drawn closer to the poles.
- The earth also like a magnet.
- The magnetic north is located close to the geographic north pole and also for the south pole.
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There are no zeros, so all three digits<span> are significant.</span>
<span>b. 3440.</span>
Explanation: Outer shell electronic configuration for Group 18 is :
( have 8 electrons in the outer shell)
The electronic configurations for other groups are:
( have 1 electron in the outer shell}
( have 2 electrons in the outer shell)
( have 5 electrons in the outer shell)
( have 6 electrons in the outer shell)
( have 7 electrons in the outer shell)
Comparing the electron configurations of group 18 to other groups.
Group 18 has fully filled outer shell, that is 8 electrons in the outer shell, while others are partially filled.