Which of the following descriptions explain the process of water freezing? A. What're molecules speed up until the escape into a different phase.
B. Water molecules slow done until they begin to form stronger bonds together.
C. As water molecules cool, their shape changes from rounded to irregular, making them more likely to link to one another
D.Water molecules are squeezed together by high pressure until they begin to stick to one another.
Answers
The correct option is B.
When the temperature of water is reduced, the water cools down and the molecules of the water lose energy and move slowly. As the water is cooling down its volume expands. When the temperature of the water reaches zero degree Celsius, the molecules of the water stick together and form solid ice, thus turning from a liquid state to a solid state.
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Water entering a confined aquifer takes ________________. centuries decades weeks days
If the volume and moles of a container are held constant, the temperature of a gas is inversely proportional to the pressure. TRUE FALSE
Which statement best describes the liquid state of matter?
b. 10 grams
c. 20 milligrams
d. 50 grams
Answers
Answer: 20 milligram per kilo gram of food.
Explanation:
FDA: Food and drug Administration
According to FDA, product labelled as gluten free must contain 20 parts per million gluten. This also means that 20 milligram of gluten per kilo gram of food. or we can also say that 20 milligrams of gluten per 35.27 ounce of food.
Hence,the correct answer is option (c).
1)Cu
2)PO4-3
3)SO2
Answers
Answer:
Explanation: the answer is B. PO4-3
Answers
Answer:
Element Symbol Atomic Mass # of Atoms Mass Percent
Lead Pb 207.2 1 46.732%
Explanation:
b. 6.2 M HF
c. 8.3 M HF
d. 15 M HF
Answers
HF = 1 + 19 = 20.0 g/mol
Number of moles :
124 / 20.0 => 6.2 moles
Volume = 2.4 L
M = n / V
M = 6.2 / 2.4
M = 2.6 M
Answer A
hope this helps!
Molarity =
moles of HF =
=
= 6.2 mol
∴ molarity of HF =
= 2.58 M
≈ 2.6 M
Answers
Explanation:
Neon is in group 8/0, which means that it has a full outer shell. Atoms react to get a full outer shell but as neon already has a full outer shell, it doesn't react and stays monatomic.
However, chlorine is in group 7, so it needs 1 more electron to complete its outer shell, two chlorine atom share one electron each with each other so they have full outer shells. This is why chlorine is diatomic.
HBr
MgO
CO2
Answers
Answer:
CO2
Explanation:
A covalent compound is a compound between 2 nonmetals. For this reason, NaCl and MgO can be eliminated since both contain metals. While neither H nor Br are metals, in HBr H is acting as a metal. CO2 is the only choice containing both nonmetals, with both elements acting like nonmetals as well.