Subatomic particles can usually pass undeflected through an atom because the volume of an atom is composed of(1) an uncharged nucleus
(2) largely empty space
(3) neutrons
(4) protons
Answers
Subatomic particles can usually pass undeflected through an atom because the volume of an atom is composed of largely empty space. The correct option is (2).
What are subatomic particles?
Subatomic particles are those particles that are present inside the atoms. They are charged particles. They are electrons, neutrons, and protons. Subatomic particles constitute the atom.
Subatomic particles known as electrons constantly revolve around the atomic nucleus of every atom. These particles are the furthest from the atom's nucleus and are negatively charged in nature.
Protons and neutrons, for example, are subatomic particles that are found in the atom's nucleus. While neutrons don't have any net charge, protons are positively charged particles.
Thus, the correct option is (2) largely empty space.
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(2) Cs-137, Fr-220, Tc-99
(3) Kr-85, Ne-19, Rn-222
(4) Pu-239, Th-232, U-238
Answers
Answer: The correct option is 3.
Explanation: Radioisotopes which emits alpha-particle are known as alpha-emitters. These radioisotopesundergo alpha-decay.
The radioisotopes which emits beta-particle are known as beta-emitters. These radioisotopes undergo beta-minus decay. In this decay a neutron gets converted to a proton and an electron.
The radioisotopes which emits positron-particle are known as positron-emitters. These radioisotopes undergo beta-plus decay. In this type of decay a proton gets converted to a neutron.
From the given options,
Option 1: All the three radioisotopes undergoes beta-minus decay.
Option 2: Cs-137 and Tc-99 radioisotopes undergo beta-minus decay.
Fr-220 is a radioisotope which undergoes alpha-decay.
Option 3: Radioisotope Kr-85 undergoes beta-minus decay.
Radioisotope Ne-19 undergoes positron decay.
Radioisotope Rn-222 undergoes alpha decay.
Option 4: All the three radioisotopes undergoes beta-minus decay processes.
Hence, from the above information, the correct option is 3.
Answers
pH is a scale used to measure the acidity or alkalinity of an aqueous solution. It can be used to calculate the amount of hydronium ions in the solution. It is expressed as the negative logarithm to the base 10 of the concentration.
pH = -log [H+]
2.0 = -log [H+]
[H+] = 0.01 M
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Answers
Final answer:
The reagent required to convert an ester-like methyl butyrate into an amide like N-methylbutyramide is ammonia or an amine. The process involves a reaction called aminolysis.
Explanation:
The reagent required for the given reaction, which converts methyl butyrate (an ester) into N-methylbutyramide (an amide), would be ammonia (NH3) or an amine. The process involves a process known as aminolysis where an amine reacts with an ester to produce an amide. This is because the nitrogen within the amine or ammonia molecules attacks the carbonyl carbon of the ester to produce amide. It's critical to maintain an acidic condition to protonate the leaving group during this process.
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Answers
You would also need to apply math when you need to figure out what the charge on an ion is by either adding or taking away electrons depending on whether it is an anion or cation.
Answer and explanation;
Ions are formed when an atom looses or gains electrons.
-Ionic charges are created when there is an imbalance of protons and electrons on an atom. Since we can not change the number of protons on the nucleus of an atom, a positively charged ion will be created when there are fewer electrons than protons (in other words when an atom looses electron). A negatively charged ion is formed or created when there are more electrons than protons in an atom (when an atom gains electrons).
-When electron are added, you are adding more negative charge and thus, results in the creation of a negative ion (anion), and when electrons are being lost by an atom, one is removing negative charge, resulting in creation of a positive ion (cation).
Answers
The answer is: D.oxymoron.
The oxymoron is a combination of contradictory or incongruous words.
In this example, deafening silence.
Deafening is a noise so loud as to make it impossible to hear anything else.
Silence is oposite of deafening, complete absence of sound.
Other examples are: big baby, original copy, living dead, sweet sorrow, soft rock, pretty ugly.
When she told us the party was canceled there was a deafening silence? A. Malapropisms B.imagery C. Hyperbole D.oxymoron
oxymoron