The answer is two miles
1 mole of any substance has 6.02 x 1023 molecules. For getting thenumber of moles we can divide 1.2 x 1024/6.02 x 1023 and we receive 2 moles.
Answer:
C
Explanation:
should be different numbers of neutrons
Answer:1. False, 2. False, 3. True, 4. True
Explanation:
1. FALSE. Pure crystalline solids have sharp melting points, while the present of impurity lower the melting point. This is True, but the exception is a eutectic mixture. A properly mixed eutectic mixture have a sharp melting point also.
2. FALSE, although the present of impurity lower the melting point of a organic compound, but if a molecular size impurity with a significantly higher melting point and is present in large quantities the melting point of the organic compound will not be lowered.
3. TRUE, two compounds with same melting point, when mixed together will not change the melting point of either compounds. But if A has higher MP than B and the addition of A to B creates mixture with same melting point as pure A then the statement will be false.
4. TRUE, a properly mixed eutectic mixture will have a sharp melting point.
Melting point and freezing point of a pure compound will be identical because the liquid form of a pure substance when cooled it forms a stable arrangement that supercooling is prevented, freezing occur at the same temperature at which the pure solid phase melts
If the concentration of the hydrogen ions, increase then the solution would become more and more acidic and thus have a lower pH value than compared to the pH value before at the 1.0 X 10^-2 M.
So, let's go trough all the options:
A can't be the answer because a barometer is an instrument to measure atmospheric pressure, not density.
B seems like the answer but it's not. A density probe is used to measure density, temperature and level of fuel in the car, and not density of an object.
C is the answer, but it doesn't give you the answer directly. *
* We know that the formula of density is:
→ By putting the piece of ore inside the graduated cylinder with water, we can measure the ore's volume and by putting it on a balance, we can measure its mass and that is all we need to find it's density.
Hope it helped,
BioTeacher101
(If you have any questions, feel free to ask them in the comments)