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Deffense [45]
2 years ago
8

Tính số nguyên tử oxi

Chemistry
1 answer:
kow [346]2 years ago
8 0

Answer:

please what do you mean

Explanation:

explain please

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When a piece of sodium carbonate reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then the s
siniylev [52]
Gas x would be carbon dioxide.

note/ acid + carbonate —> salt + water + carbon dioxide

the white precipitate would be calcium carbonate. CaCo₃

note/ this is a common eqn u need to remember.

X - CO₂ (carbón dioxide)
Y - CaCo₃ (calcium carbonate)

sodium carbonate is a basic salt
7 0
3 years ago
Is hydrogen a neutral atom or ion
Sloan [31]

Answer:

Hydrogen is the smallest chemical element. It has one proton and one electron, making it neutral. However, the ions of hydrogen atom are charged species. Thus, the key difference between hydrogen atom and hydrogen ion is that the hydrogen atom is neutral whereas hydrogen ion carries a charge.

4 0
3 years ago
Read 2 more answers
A current of 5. 68 a is passed through a Fe(NO3)2 solution. How long, in hours, would this current have to be applied to plate o
daser333 [38]

There are  1.2 hr would this current have to be applied to plate out 7. 20 g of iron .

Calculation ,

Given ; Current ( I ) = 5. 68 A

In Fe(NO_{3} )_{2} , the valancy of Fe is +2 .

2 moles of e^{-} are required for the decomposition of 1 mole of Fe .

7. 20 g  of Fe in moles  = 7. 20 g /55.845 g/mol =0.12 mole

x moles of  e^{-} are required for the decomposition of 0.128 mole of Fe .

moles of   e^{-} are required = 0.256 moles

Charge on 1 mole  of   e^{-} = 96500 C

Charge on 0.256  mole  of   e^{-} = 24704 C

Current ( I )= Q/t  

t =Q / I = 24704 C/5. 68 A = 4349 sec = 1.2 hr

Therefore , there are  1.2 hr would this current have to be applied to plate out 7. 20 g of iron .

To learn more about iron

brainly.com/question/18500540

#SPJ4

8 0
1 year ago
Which of these planets has the coldest surface temperature?
lianna [129]

Neptune planet has the coldest surface temperature

<u>Explanation:</u>

With temperatures falling to -218°C in Neptune’s upper atmosphere, the planet is one of the coolest in our Solar System.  Neptune is the most faraway planet from the sun. Astronomers have speculated that Neptune's huge internal temperature and the transfer of heat between the core and outer layers might be the cause why Neptune isn't significantly more chill than Uranus.

Pressures in this area range between 1 and 5 bars and the temperature reaches a high of 72 K. At this temperature, states are becoming for methane to condense, and clouds of ammonia and hydrogen sulfide are thought to form. At its core, Neptune reaches temperatures of up to 7273 K which is equivalent to the surface of the sun.

3 0
3 years ago
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An insect population increases and then decreases as the food supply changes.
Arada [10]

Answer:

self regulation

Explanation:

4 0
3 years ago
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