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3 years ago

How did the atomic theory develop

1 answer:

4 0

It was the English chemist, John Dalton, who put the pieces of the puzzle together and developed an atomic theory in 1803. Dalton 's atomic theory<span> contains five basic assumptions:

- All matter consists of tiny particles called </span>atoms<span>.
</span>- Atoms are indestructible and unchangeable.- Elements are characterized by the weight of their atoms.
- In chemical reactions, atoms combine in small, whole-number ratios.
- When elements react, their atoms may combine in more than one whole-number ratio.

Hope this helped!

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The volume of water in a graduated cylinder should be read _________________ the meniscus.

enyata [817]

D.
The volume of water in a graduated cylinder
should be read at the bottom of the curve of the meniscus.

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3 years ago

Read 2 more answers

Submit a data table you made and a atom diagram. Remember to proofread your work before submitting the work. I will give 30 poin

nadezda [96]

Answer:

There's no picture, so I can't help witht his, apologies!

Explanation:

3 0

3 years ago

How are the colors distinguished from one another.

madreJ [45]

Well, you see a certain color when a certain part of lightis reflected rather than and order by a material. For example, you see red because it was the only part of light that reflected.

Please tell me if that helped.

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4 years ago

what mass of copper is produce when Zinc is added to a solution containing 31.9g copper (ii) tetraoxosulphate (vi)

Sergio [31]

12.7 grams of copper will be produced.

<h3><u>Explanation</u>:</h3>

Copper is placed below zinc in the metal activity series. This means zinc can replace copper from its salt. Here zinc is added to the salt solution of copper sulphate. The reaction involved is

CuSO4 +Zn =ZnSO4 +Cu.

Zinc sulphate is soluble in the solution and rose red copper will be precipitated from the solution.

From the chemical equation we can see that 1 mole of zinc replaces 1 mole of copper. As no mass of zinc added is mentioned we will assume that excess of zinc is added.

Atomic mass of copper = 63.5

Atomic mass of sulphur = 32.

Atomic mass of oxygen = 16.

So molecular mass of copper sulphate = $63.5 + 32 + 4\times16$ = 159.5.

So, mass of 1 mole of copper sulphate is 159.5 grams.

So, in 31.9 grams of copper sulphate, number of moles of copper sulphate present = $\frac {159.5}{31.9}$ = 0.2

In 1 mole of copper sulphate, 1 mole of copper is present.

So in 0.2 moles of copper sulphate, 0.2 moles of copper is present.

So mass of 0.2 moles of copper = $0.2\times63.5$ = 12.7 grams

8 0

4 years ago

Electron sharing can be depicted by a Lewis dot structure, in which element symbols are surrounded by dots that represent the va

Nina [5.8K]

Answer:

Outermost

Covalent

Two

One

Two

Covalent

One

Explanation:

A covalent bond is formed when an atom shares two electrons with another atom. These shared electrons could be contributed by each of the bonding atoms or by only one of the bonding atoms.

Hydrogen has the electronic configuration of 1s1. This implies that it has only one electron in its valence shell although the 1s shell can accommodate two electrons. When the atomic orbitals of carbon and hydrogen overlap, they share two electrons and hydrogen is now associated with two electrons in a covalent bond.

Since hydrogen possesses only one valence electron, it can not be bonded to two atoms.

4 0

3 years ago