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4 years ago

Which statement describes J.J. Thomson’s plum-pudding model of the atom?

1 answer:

4 0

Option C: the electrons are embedded in a positive sphere.

As we know that was a wrong model and nowadays the electrons are considered to be around the nucleus, in regions called orbitals.

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In the following reaction, how many grams of NaBr will produce 244 grams of NaNO3? Pb(NO3)2(aq) 2 NaBr(aq) PbBr2(s) 2 NaNO3(aq)

lyudmila [28]

Answer : The mass of $NaBr$ is, 295.323 grams

Solution :

First we have to calculate the moles of $NaNO_3$ .

$\text{Moles of }NaNO_3=\frac{\text{Mass of }NaNO_3}{\text{Molar mass of }NaNO_3}=\frac{244g}{85g/mole}=2.87moles$

Now we have to calculate the moles of NaBr.

The balanced chemical reaction is,

$Pb(NO_3)_2(aq)+2NaBr(aq)\rightarrow PbBr_2(s)+2NaNO_3(aq)$

From the balanced reaction we conclude that

As, 2 moles of $NaNO_3$ react with 2 moles of $NaBr$

So, 2.87 moles of $NaNO_3$ react with 2.87 moles of $NaBr$

Now we have to calculate the mass of NaBr.

$\text{Mass of }NaBr=\text{Moles of }NaBr\times \text{Molar mass of }NaBr$

$\text{Mass of }NaBr=(2.87mole)\times (102.9g/mole)=295.323g$

Therefore, the mass mass of $NaBr$ is, 295.323 grams

7 0

3 years ago

What type of conspiracy did Apple take part in?

zimovet [89]

There is sufficient evidence to show that Apple violated Section 1 of Sherman Act by making publishers raise price of e-books.

Explanation:

Google

6 0

3 years ago

Read 2 more answers

I need help with B and C

lakkis [162]

B) Mg is the alkaline earth metal w/12 protons so following the periodic table to the halogen in the same period is

Cl: Chlorine

C) The Neutral noble has w/ 18 electrons is argon so the metal in the same row is

Na: Sodium

8 0

3 years ago

Which of the following statements describes a physical property?

castortr0y [4]

The substance has a higher density than water

8 0

3 years ago

Read 2 more answers

Which of the following pairs of elements is most likely to form an ionic compound? a oxygen and fluorine b sodium and aluminum c

irina [24]

An ionic compound consists of a metal AND a non-metal.

Option A:

Oxygen and fluorine are non-metals.

Option B:

Sodium and aluminium are non-metals.

Option C:

Calcium is a metal and chlorine is a non-metal.

Option D:

Nitrogen and sulfur are non-metals.

Thus, the answer is C.

4 0

3 years ago