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2 years ago

The smallest particle of an element is a(n) .atommoleculeDNA

Chemistry

1 answer:

mamaluj [8]2 years ago

5 0

Answer:

An atom is the smallest particle of an element

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Answer: It gets wasted in various forms.

Explanation: The most common way of this energy being wasted is called "waste heat".

Waste heat is the unused heat given to the surrounding environment (in the form of thermal energy) by a heat engine in a thermodynamic process (like a chemical reaction as you said) in which it converts heat to useful work.

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2 years ago

Metallic bonding is possible because the electrons

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A book on a table presses downward with a force equal to the upward force exerted by the table. This is an example of Newton's__

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2 years ago

Read 2 more answers

Iron-59 is a beta emitter with a half-life of 44.5 days. If a sample initially contains 180 mg of iron-59, how much iron-59 is l

Jobisdone [24]

Answer:

2.79 mg iron-59 is left in the sample after 267 days.

Explanation:

Given that:

Half life = 44.5 days

$t_{1/2}=\frac {ln\ 2}{k}$

Where, k is rate constant

So,

$k=\frac {ln\ 2}{t_{1/2}}$

$k=\frac {ln\ 2}{44.5}\ days^{-1}$

The rate constant, k = 0.0156 days⁻¹

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration = 180 mg

Time = 267 days

So,

$[A_t]=180\ mg\times e^{-0.0156\times 267}$

$[A_t]=180\times e^{-0.0156\times 267}\ mg$

$[A_t]=2.79\ mg$

<u>2.79 mg iron-59 is left in the sample after 267 days.</u>

5 0

2 years ago

If you wanted to neutralize 4.00g NaOH, what volume (l) of 1.0 M HCl would you need?

zhannawk [14.2K]

The balanced reaction between NaOH and HCl is as follows
NaOH + HCl ----> NaCl + H₂O
stoichiometry of NaOH to HCl is 1:1
molar mass of NaOH is 40 g/mol
number of moles = $\frac{mass present }{molar mass}$
therefore number of NaOH moles - 4.00 g / 40 g/mol = 0.100 mol
since molar ratio of HCl to NaOH is 1:1
number of HCl moles required = 0.100 mol
Molarity of HCl is 1.0 M
this means that a volume of 1 L contains 1.0 mol
therefore volume containing 0.100 mol - 0.100 mol / 1.0 mol/L = 0.10 L
volume of HCl required = 100 mL

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2 years ago

The smallest particle of an element is a(n) .atommoleculeDNA​

The smallest particle of an element is a(n) .atommoleculeDNA