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sergiy2304 [10]
3 years ago
15

What is atom ? chemistry​

Chemistry
1 answer:
Neporo4naja [7]3 years ago
3 0

Answer:

atom is the smallest unit of matter that has the characteristic properties of a chemical element. 

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Sodium chromate is used to protect iron from corrosion and rusting. determine its formula mass. 261.97 amu 238.98 amu 74.99 amu
Reptile [31]
This problem requires that you know nomenclature, to identify the formula of the compond from its name, and the way how to determine the formula mass once you know formula.

1) Nomenclature: Chromate

Chromate is an ion (anion) from the chromic acid.

Chromic acid is formed from Chromic oxyde with the atomic number 6.

Then Cr + O2 -> Cr2O6 = CrO3

CrO3 + H2O -> H2CrO4

H2CrO4 = 2H(+) + CrO4 (2-) <---- this is the ion chromate

Now you have to join the chromate ion with the sodium ion => Na2 (CrO4)

2) Now you can calculate the molar mass of the formula Na2(CrO4).

You must only muliply every subscript times the atomic mass of the element:

Na2 => 2 * 23 g/mol = 46 g/mol

Cr => 52 g/mol

O4 => 4 * 16g/mol = 64 g/mol

Formula mass = 46 g/mol + 52 g/mol + 64 g/mol = 162 g/mol

I used the numbers with less significant figures thant the problem required but the answer is evident. Also, g / mol = a.m.u = atomic mass unit.

Answer: 161.97 a.m.u
5 0
3 years ago
Write the skeleton equation for the reaction between hydrochloric acid (HCl) and zinc. The products are hydrogen gas and zinc ch
skelet666 [1.2K]

Answer:

HCl + Zn = H2 + ZnCl2

Explanation:

(pretend the = is the arrow thing)

4 0
2 years ago
Combustion _____.
KIM [24]
In combustion energy is released so it is an exothermic process !!

the answer is 2nd one !!
3 0
3 years ago
Read 2 more answers
Explain the neutralization of vitamin c with sodium hydrogen carbonate?
mars1129 [50]
Scientists have known the consequences of mixing sodium bicarbonate and vitamin C ever since 1936, when a study on the subject was published in the "Journal of Nutrition." The authors of this study measured the amount of vitamin C recovered from the urine of people who drank a fixed amount of orange juice. The authors determined that the amount of vitamin C excreted was decreased by administration of sodium bicarbonate. Followup studies in the 1940s showed that this effect was due to the neutralization of the vitamin C by the sodium bicarbonate.
3 0
3 years ago
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65.39<br>Atomic # =<br>Atomic Mass =<br># of Protons =<br># of Neutrons =<br># of Electrons =​
ratelena [41]

Answer:

The answer to your question is below

Explanation:

Atomic mass = 65.39 g

Searching this number in the periodic table we find that the element is Zinc.

Then:

# of Protons = 30

# of neutrons = atomic mass - # of protons

                       = 65.39 - 30

                        = 35.39

# of electrons = # of protons = 30

8 0
3 years ago
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