An object with a mass of 2.0kg accelerates 2.0m/s when an unknown force is applied. what is the amount of force?
1 answer:
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Yes that is true.
Water:
Carbon dioxide:
Both have O
Water:
Carbon dioxide:
Both have O
<u> There are more total ions in 2.2 moles of </u>
Ion, any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations; negatively charged ions, anions.
Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms.
Examples of these processes include the reaction of a sodium atom with a chlorine atom to form a sodium cation and a chloride anion; the addition of a hydrogen cation to an ammonia molecule to form an ammonium cation; and the dissociation of a water molecule to form a hydrogen cation and a hydroxide anion.
Learn more about ions
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Answer: A) 0.0480 grams and B) 56.16 years.
Explanation: Half live is the time in which the amount of radioactive substance remains halve of its initial amount.
The formula we use for solving this type of problem is:
where, is the initial amount and N is the remaining amount of radioactive substance and n is the number of half lives.
where, T is the time and is half life.
A) from given data, = 2 g
T = 70 years
= 13 years
N= ?
n = 5.38
N = 0.0480 g
So, 0.0480 grams of the substance will be remaining after 70 years.
B) = 2 g
N = 0.1 g
T = ?
Let's first calculate the value of n for this.
Taking log to both sides:
n = 4.32
Half life is 13 years, so we can calculate the time as:
T = 56.16 years
So, it will take 56.16 years for the radioactive substance to decay from 2 g to 0.1 g.