Two fractions that are equivalent to 90/100
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After 32 days, 5 milligrams of an 80-milligram sample of a radioactive isotope remains unchanged. What is the half-life of this element?(1) 8 days (3) 16 days(2) 2 days (4) 4 days
Sketch the structure of an atom according to the Plum Pudding and Nuclear Atomic Models. Label the subatomic particles in each sketch and list the key points associated with each model.
Which of the following ions has a smaller size? Option 1: O2- Option 2: F- Option 3: They have the same size. Option 4: None of the above.
The empirical formula for a compound is CH2. If n is a whole number, which shows a correct relationship between the molecular formula and the empirical formula? a)<br /><br /> empirical formula mass / molecular mass = n<br /><br /> B) molecular mass = element mass / empirical formula mass ´ 100<br /><br /> c) subscript of H in empirical formula = 2  subscript of H in molecular formula<br /><br /> D) subscript of C in molecular formula = n  subscript of C in empirical formula<br /><br />
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Answer:
Depending upon the mass gathered, the next process formation varies:
Nuclear fusion can kick in leading to formation of star. The nuclei fuse to together and energy is liberated in the form of light and heat.
If sufficient mass is not gathered to start nuclear fusion reaction, gaseous planet forms like Jupiter.
In third case, even though sufficient mass is present (twice the mass of Jupiter) still no fusion reaction starts. Such bodies are known as failed stars or brown dwarfs.
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Urea has H₂N- group attached to Carbonyl Group (C=O), and such class of comounds conataining H₂N-C=O bond are called as Amides.
Result:
So, Phenobarbital belongs to Amides.
Stored electrical energy is converted to mechanical energy.
Stored mechanical energy is converted to mechanical energy.
Stored nuclear energy is converted to electrical energy.
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Answer: With a positively charged nucleus.
Explanation:
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(K) potassium is the metal that will react most readily with 1.0 M HCl to produce H2(g).
What is potassium?
Potassium is a silvery-white metal with the symbol K and atomic number 19.
The reaction will be
The potassium will react with HCl to produce potassium chloride and hydrogen gas.
It is a single displacement reaction.
In this type of reaction, more reactive metal is displaced with less reactive metal.
Thus, the correct option is 2) K.
Learn more about potassium, here:
Answer: The correct answer is Option 2.
Explanation:
The reaction between a metal and HCl is a type of single displacement reaction.
Single replacement reactions are defined as the reactions in which more reactive metal replaces less reactive metal from its chemical equation. The reactivity is determined from the series called reactivity series. The metal lying above in the series is more reactive than the metal lying below in the series.
General equation for these types of reactions is:
From the series attached below, the most reactive metal is Potassium (K).
Increasing order of the reactivity of metals are:
Hence, the correct answer is Option 2.
gas ➡ solid
liquid ➡ gas
solid ➡ gas