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4 years ago

In the ground state, an atom of which element has two valence electrons?

2 answers:

6 0

I am unsure if your teacher has taught you this, but, on a periodic table (of which you can find photos of on google) the numbers above each group how many valence electrons the atom has :) at 10 it restarts at 1<span />

Akimi4 [234]4 years ago

5 0

I would say Ni so yeah thats ur answer

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Scientist who discovered the atomic nucleus is ________. dalton b. thomson chadwick d. rutherford

german

It’s D. Rutherford discovered the atomic nucleus.

7 0

3 years ago

If 20.0 g acetylene is allowed to completely react with oxygen, how many grams of o2 are reacted? 2c2h2(g 5o2(g → 4co2(g 2h2o(g

KATRIN_1 [288]

The balanced chemical reaction is written as:

<span>2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)

We are given the amount of acetylene to be used in the reaction. This will be the starting point for the calculations.

20.0g C2H2 ( 1 mol / 26.04 g) ( 5 mol O2 / 2 mol C2H2 ) ( 32 g / 1 mol ) = 61.44 g O2 is needed</span>

7 0

4 years ago

Is NaOH an acid or base

ExtremeBDS [4]

Answer:

Explanation:

4 0

3 years ago

How many molecules are present in 187 grams of XeF4

PtichkaEL [24]

There are 5.43 x 10²³ present in 187 grams of XeF₄

<h3>Further explanation </h3>

The mole is the number of particles(molecules, atoms, ions) contained in a substance

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

$\tt n(mol)=\dfrac{mass(m)}{MW}$

mass of XeF₄ = 187 g

mol XeF₄ (MW=207,2836 g/mol) :

$\tt mol=\dfrac{187}{207,2836 g/mol}=0.902$

Number of molecules :

$\tt N=0.902\times 6.02\times 10^{23}\\\\N=5.43\times 10^{23}$

4 0

3 years ago

As the temperature of a reaction is increased, the rate of the reaction increases because the . (A) reactant molecules collide m

vredina [299]

Answer:

Explanation:

Temperature is the measure of "hotness" of a system. When temperature increases, the kinetic energy of the particles increase. So they will collide with greater energy per collision.

5 0

3 years ago