All categories

3 years ago

How to remember first 20 periodic table

Chemistry

1 answer:

Sergeeva-Olga [200]3 years ago

4 0

Answer:

The first 20 Elements of the Periodic Table: Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminium, Silicon, Phosphorus, Sulphur, Chlorine, Argon, Potassium, Calcium.

Mnemonic:

Harry He Likes Beer Bottle Cold, Not Over Frothy. Nelly's Nanny Might, Although Silly Person, She Climbs Around Kinky Caves;

Mnemonic:

He Has Light Brain But Can Not Offer Full Nine Subjects, May All Senior Professional Scientists Come And Protect Chemistry

Mnemonic:

He Has Large Brain But Can Not Offer Full Nine Subjects, Master Art Students Prefer Simple Colours And Pretty Colours

Mnemonic:

"H.HeLi, B.BCNOF and NeNa MgAl SiPS ClArKCa"

Mnemonic:

"Hi Helen, Listen B.B.C. News On Friday N(e)ight. Naughty Maggie Always Sings Pop Songs. Clever Archie Kissed Cathy."

You might be interested in

Moles of cations are in 1.35 mol of K2SO4

KatRina [158]

1.35 mole of K₂SO₄ contain 2.7 moles of cation.

Cations are positive ions. They are the ions of metallic elements.

To obtain the answer to the question, we'll begin by calculating the number of mole of cations in 1 mole of K₂SO₄.

K₂SO₄ (aq) —> 2K⁺ (aq) + SO₄²¯ (aq)

<h3>Cation => K⁺</h3>

From the balanced equation above,

1 mole of K₂SO₄ contains 2 moles of K⁺ (i.e cation).

Finally, we shall determine the number of mole of cation in 1.35 mole of K₂SO₄. This can be obtained as follow:

1 mole of K₂SO₄ contains 2 moles of K⁺ (i.e cation).

Therefore, 1.35 mole of K₂SO₄ will contain = 1.35 × 2 = 2.7 moles of K⁺ (i.e cation).

Hence, we can conclude that 1.35 mole of K₂SO₄ contain 2.7 moles of cation

Learn more: brainly.com/question/24707125

6 0

2 years ago

Which of the following statements about tornadoes is false?

loris [4]

The answer is A because the time wouldn't affect the weather that much depending on the circumstances.

4 0

3 years ago

Read 2 more answers

Does The nucleus of an atom contain all of the protons in the atom

insens350 [35]

Answer:

The nucleus, that dense central core of the atom, contains both protons and neutrons.

So to answer your question yes it does contain all of the protons in the atom.

* Hopefully this helps:) Mark me the brainliest:)!

5 0

3 years ago

Please help thaank youu

krek1111 [17]

First, let's start off by finding the mass of this whole hydrate.
(Note: the unit of measurement for mass will be amu)

Let's find the molecular mass of each element.
$Co=58.933$
$Cl=35.45$
$H=1.008$
$O=15.999$

Now, let's find the mass of each compound.

$CoCl_2=58.933+2(35.45)=129.833$
$H_2O=2(1.008)+15.999=18.015$

We have 6 molecules of H2O, so multiply 18.015 by 6 then add that with the weight of CoCl2.

$6(18.015)=108.09$
$129.833+108.09=237.923$

Now divide 108.09 (mass of all the H2O in the hydrate) by 237.923 (total mass of hydrate).

$\dfrac{108.09}{237.923}$

$\approx0.45431$

Turn that into a percentage and you get 45.431%.
Hope this helps! :)

6 0

3 years ago

Which is an example of making a quantitative observation?

Elanso [62]

Answer:

A) measuring mass of metal used in a reaction

Explanation:

Quantitive observations is data involving statistics and numerical values.

4 0

2 years ago

How to remember first 20 periodic table​

How to remember first 20 periodic table