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lawyer [7]
3 years ago
11

17 Which substance can not be broken down by a chemical change?(1) ammonia (3) propanal

Chemistry
2 answers:
lyudmila [28]3 years ago
6 0
Zirconium cannot be broken down by a chemical change, because it is an element. The others are all molecules.
Sindrei [870]3 years ago
5 0
(4) Zirconium

Because it cannot be broken down by chemical change neither a chemical property. It is an element. It consists of only one atom.
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What is the number of protons plus the number of neutrons in the nucleus of an atom equivalent to?
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Answer:

b

Explanation:

b/c proton + neutron=mass number and

mass number - proton= neutron

7 0
2 years ago
The average atomic masses of some elements may vary, depending upon the sources of their ores. Naturally occurring boron consist
frez [133]
Sorry I don’t know but good luck!
6 0
3 years ago
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A container is filled with oxygen gas, and the pressure of
Amanda [17]

Answer:

77,007 Pa

Explanation:

Hello!

In this case, since the equivalence statement for atmospheres and pascals is:

1 atm = 101,325 Pa

We can set up the following conversion factor to obtain the pressure in pascals:

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3 0
2 years ago
2.38g of black copper(iii) oxide is completely reduced to by hydrogen to give copper and water. What are the number of atoms of
OleMash [197]

Explanation:

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6 0
2 years ago
Suppose Highlinium-308 can also undergo positron emission
____ [38]

Answer:

The atomic number of burienium will be 307.

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During positron emission proton is converted into the neutron and one electron neutrino with positron is released. It means the atomic number will be reduce by one and atomic mass remain same.

For example:

²³Mg₁₂    →     ₁₁Na²³+ e⁺+ Ve

Similarly, when highlinium-308 undergoes positron emission the new element burienium is produced and the atomic number will be 307 while atomic mass remain same.

Properties of beta radiations:

Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.

The mass of beta particle is smaller than the alpha particles.

They can travel in air in few meter distance.

These radiations can penetrate into the human skin.

The sheet of aluminium is used to block the beta radiation

4 0
3 years ago
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