Where do cold air masses form?

Answers

Answer 1

Answer: cold air masses originate far away from the Equater and they aquire the characteristics of the area they formed over, and then travel closer to the equater,

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Sort the following situations into chemical change or physical change:1. salt dissolves in water
2. Hydrochloric acid reacts with magnesium to produce hydrogen gas
3. a piece of copper is cut in half
4. a sugar cube is ground up
5. water is heated and changed to steam
6. iron rusts
7. ethyl alcohol evaporates
8. ice melts
9. milk sours
10. sugar dissolves in water
11. sodium and potassium react violently with water
12. pancakes cook on a griddle
13. grass grows on a lawn
14. a tire is inflated with air
15. food is digested in the stomach
16. water is absorbed by a paper towel
17. ethyl alcohol boils at 79 egress Celsius
18. paper burns
19. water freezes at 0 degrees Celsius
20. fireworks explode
21. alka-seltzer gives off carbon dioxide when added to water
22. clouds form in the sky

Answers

Chemical
2. Hydrochloric acid reacts with magnesium to produce hydrogen gas
5. water is heated and changed to steam
6. iron rusts
9. milk sours
7. ethyl alcohol evaporates
11. sodium and potassium react violently with water
12. pancakes cook on a griddle
15. food is digested in the stomach
17. ethyl alcohol boils at 79 egress Celsius
18. paper burns
20. fireworks explode
21. alka-seltzer gives off carbon dioxide when added to water
22. clouds form in the sky

Physical
19. water freezes at 0 degrees Celsius
16. water is absorbed by a paper towel
14. a tire is inflated with air
13. grass grows on a lawn
1. salt dissolves in water
3. a piece of copper is cut in half
4. a sugar cube is ground up
8. ice melts
10. sugar dissolves in water

The combustion of 14 grams of co according to the reaction co(g) ½o2(g) co2(g) 67.6 kcal gives off how much heat?

Answers

The balanced reactionthat describes the reaction between carbon monoxide and oxygen to producecarbon dioxide is expressed co(g)+ ½o2(g) → co2(g). The heat of combustion is 67.6 kcal per mole CO. We are given with 14 grams CO. Convert this to mole equal to 0.5 mole. Hence the total heat is 33.8 kcal.

Answer:

It is 33.8.

Explanation:

All funguslike protists are able to do this at some point in their lives

Answers

Protists belong to the group eukaryotes (having their DNA enclosed inside the nucleus). They are not plants, animals or fungi but they act like one. They can be in general subgroups such as unicellular algae, protozoa and molds.

A beaker contains 100 mL of NaOH solution at pH = 13. A technician carefully pours into the beaker 10 mL of HCl at pH = 1. Which of the following statements correctly describes the results of this mixing?a. The concentration of Na⁺ ion rises.
b. The concentration of Cl⁻ ion will be 0.1M.
c. The concentration of undissociated H₂O molecules remains unchanged.
d. The pH of the beaker's contents will be neutral.
e. The pH of the beaker's contents falls.

Answers

Answer: Option (e) is the correct answer.

Explanation:

Since, the beaker contains NaOH solution whose pH is 13. As pH of NaOH is greater than 7 so, it means that this solution is basic in nature.

Whereas pH of HCl solution is equal to 1. As its pH is less that 7 so, it is acidic in nature.

Hence, when we add 10 ml of HCl into 100 mL of NaOH then there will be a slight decrease in pH of the solution because an acid is being added into the NaOH solution.

Thus, we can conclude that the statement pH of the beaker's contents falls, correctly describes the results of this mixing.

If it takes 54 mL of 0.1 M NaOH to neutralize 125 mL of an HCl solution,what is the concentration of the HCl ?

Answers

volume of NaOH = 54 mL / 1000 = 0.054 L

Molarity NaOH = 0.1 M

Number of moles NaOH :

n = M * v

n = 0.1 * 0.054

n = 0.0054 moles of NaOH

Finally we calculate the number of moles of HCl in the solution from the stoichiometry of the reaction :

HCl + NaOH = NaCl + H₂O

1 mole HCl -------- 1 mole NaOH
? moles HCl ------- 0.0054 moles NaOH

moles HCl = 0.0054 * 1 /1

= 0.0054 moles of HCl

Volume of HCl = 125 mL / 1000 = 0.125 L

M ( HCl ) = n / V

M = 0.0054 / 0.125

= 0.0432 M

hope this helps!

The quantum mechanical model of the atom

Answers

involves the probability of finding an electron in a certain position. thats the answer

No two electrons in an atom can have exactly the same quantum numbers. Orbital quantum numbers tell you what energy level the electron is in. In the Bohrmodel, this represents how high the orbit is above the nucleus; higher orbits have more energy

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Compare the hydronium ion concentration of the solution having a pH of 2.0 to the hydronium ion concentration of the other solution given to the student.

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A train is accelerating at a rate of 11.8 m/s2. What is this rate in units of nm/ms2?A1.18x10^-11 nm/ms^2B1.18x10^-14nm/ms^2C1.18x10^7nm/ms^2D1.18x10^9nm/ms^2E1.18x10^4nm/ms^2