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givi [52]
3 years ago
14

Which of these statements about half-life is true? Check all that apply. Half-lives vary dramatically from isotope to isotope. A

relationship exists between isotopes and half-lives. Half-lives are constant for a particular isotope. Half-life is an exact measure of when individual atoms will decay. Temperature, pressure, and density affect the half-life of an isotope.​
Chemistry
1 answer:
juin [17]3 years ago
7 0

Answer:A,C

Explanation:

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You must make 1 L of 0.2 M acetic acid (CH3COOH). All you have available is concentrated glacial acetic acid (assay value, 98%;
Sergeu [11.5K]

Answer:

The correct answer is "11.44 ml".

Explanation:

Molarity,

= 0.2 M

Density,

= 1.05 g/ml

Volume,

= 1 L

As we know,

⇒  Molarity=\frac{No. \ of \ moles }{Volume \ of \ solution}

or,

⇒  No. \ of \ moles=Molarity\times Volume

On putting the values, we get

⇒                         =0.2\times 1

⇒                         =0.2 \ moles

Now,

⇒  No. \ of \ moles=\frac{Mass \ taken}{Molecular \ mass}

or,

⇒  Mass \ taken=No. \ of \ moles\times Molecular \ mass

⇒                      =0.2\times 60.05

⇒                      =12.01 \ gram

hence,

⇒  Density= \frac{Mass }{Volume}

or,

⇒  Volume=\frac{Mass}{Density}

⇒                =\frac{12.01}{1.05}

⇒                =11.44 \ ml

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3 years ago
What are the variables that don't change
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Constant variable/control variable
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What is the difference between an atom in the ground state and an atom in an excited state? A. The atom in the ground state has
Marizza181 [45]

The correct option is C.

An atom can be either in the ground state or in an excited state. An atom is said to be in the ground state, if the total energy of its electron can not be lowered by moving one or more electrons into different orbitals. At the ground state, the electrons in the atom have the lowest energy possible and they are stable. On the other hand, an atom is said to be in an excited state, if the energy of its electrons can be lowered by transferring one or more electrons into different orbitals. An atom in an excited state has more energy and is less stable.

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4 years ago
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Which term is defined as the region in an atom where an electron is most likely to be located
GREYUIT [131]
The region where an electron is most likely to be located is known as the electron cloud.
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Step 4: Solve the equation.<br> KE = 27.5 kg x 4 m²/s2<br> =
harkovskaia [24]
Kinetic energy is 1/2m*v^2
They already halved the mass for you and they already squared the velocity for you. I’m unsure why you’re even asking this question. It’s simple multiplication at this point.
(27.5kg)*(4m^2/s^2) = 110 Jules
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