All categories

4 years ago

What does the most accurate clock tell us

Chemistry

2 answers:

Murrr4er [49]4 years ago

6 0

It tell us the most accurate time u can get out of a clock

Tom [10]4 years ago

5 0

1 second is the time that elapses during 9,192,631,770 cycles of the radiation produced by the transition between two levels of the caesium 133 atom

You might be interested in

PLEASE ANSWER

RoseWind [281]

It is a radio wave

Explanation:

The energy of an electromagnetic waves is related to its frequency by the equation:

$E=hf$

where

h is the Planck constant

f is the frequency of the wave

We notice that the energy of an electromagnetic wave is proportional to its frequency. This means that waves with higher frequencies, such as gamma rays, x-rays, are more energetic, while waves with lower frequencies, such as microwave and radio waves, are the less energetic.

In this case, we want to find the frequency of a wave with energy

E = 0.000001 eV

Converting into Joules,

$E=1\cdot 10^{-6} eV \cdot 1.6\cdot 10^{-19} J/eV=1.6\cdot 10^{-25} J$

Solving for the frequency,

$f=\frac{E}{h}=\frac{1.6\cdot 10^{-25}}{6.63\cdot 10^{-34}}=2.4\cdot 10^8 Hz = 240 MHz$

Which falls in the range of frequency of radio waves.

Learn more about electromagnetic waves:

brainly.com/question/9184100

brainly.com/question/12450147

#LearnwithBrainly

4 0

3 years ago

1500 millimeters to km

gizmo_the_mogwai [7]

0.0015 kilometers is for sure the answer!

4 0

3 years ago

Which is the most to least soluble: NH3, NBr3, N2

Rom4ik [11]

Answer: https://quizlet.com/368481219/chem-2052-1-flash-cards/

I hope this helps! if not contact me for more help

8 0

3 years ago

If you have an aqueous solution that contains 1.5 moles of hcl, how many moles of ions are in the solution? (a) 1.0, (b) 1.5, (c

Darya [45]

If you have an aqueous solution that contains 1.5 moles of HCl, the number of moles of ions in the solution is 3.0 moles.

<h2>Further Explanation </h2><h3>Strong acids </h3>

Strong acids are types of acids that undergo complete dissociation to form ions when dissolved in water.
Examples of such acids are, HCl, H2SO4 and HNO3
Dissociation of HCl

HCl + H₂O ⇔ H₃O⁺ + OH⁻

<h3>Weak acids </h3>

Weak acids are types of acids that undergo incomplete dissociation to form ions when dissolved in water.
Examples of such acids are acetic acids and formic acids.
Dissociation of acetic acid

H₃COOH ⇔ CH₃COO⁻ + H⁺; CH₃COO⁻ is a conjugate base of acetic acid.

HCl which is a strong acid that ionizes completely according to the equation;

HCl + H₂O ⇔ H₃O⁺ + OH⁻

From the equation, 1 mole of HCl produces 1 mole of H₃O⁺ ions and 1 mole of OH⁻ ions.

Therefore;

1.5 moles of HCl will produce;

= 1.5 moles of H₃O⁺ ions and 1.5 moles of OH⁻ ions.

This gives a total number ions of;

= 1.5 + 1.5

= 3 moles of ions

Keywords: Strong acid, weak acid, ions, ionization

<h3>Learn more about: </h3>

Strong acid: brainly.com/question/3239966
Weak acid; brainly.com/question/3239966
Ionization of acids and bases: brainly.com/question/11844503

Level: High school

Subject: Chemistry

Topic: Salts, Acids and Bases

6 0

3 years ago

Read 2 more answers

A student reacts 20.0 grams of sodium hydroxide with excess hydrochloric acid, and obtains a

Tcecarenko [31]

Answer:

Percent yield of NaCl = 87.75 %

Explanation:

Data given

mass of sodium = 20.0 g

actual yield of Sodium chloride = 25 g

percent yield of sodium chloride = ?

Reaction Given:

NaOH + HCI --> NaCl + H₂O

Solution:

First we have to find theoretical yield.

So, Look at the reaction

NaOH + HCI ---------> NaCl + H₂O

1 mol 1 mol

As 1 mole of NaOH give 1 mole of NaCl

Convert moles to mass

molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

molar mass of NaCl = 23 +35.5 = 58.5 g/mol

Now

NaOH + HCI ---------> NaCl + H₂O

1 mol (40 g/mol) 1 mol (58.5 g/mol)

40 g 58.5 g

So 40 g of NaOH gives 58.5 g of NaCl so how many grams of Sodium chloride will be produced by 20 g of NaOH.

Apply Unity Formula

40 g of NaOH ≅ 58.5 g of NaCl

20 g of NaOH ≅ X g of NaCl

Do cross multiply

g of NaCl = 58.5 g x 20 g / 40 g

g of NaCl = 29.25 g

So the Theoretical yield of NaCl = 29.25 g

Now Find the percent yield of NaCl

Formula Used

percent yield = actual yield /theoretical yield x 100 %

Put value in the above formula

percent yield = 25 / 29.2 x 100 %

percent yield = 87.75 %

percent yield of NaCl = 87.75 %

7 0

4 years ago