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3 years ago

Pls help!!! I will mark you as brainliest if you answer the question!!

Chemistry

1 answer:

SVEN [57.7K]3 years ago

5 0

1 — Element D and A ( Which are Sodium and aluminium )

2 — ( 2 + 8 + 3 = 13 electrons total ) Element A Because it's atomic number is 13.

3 — Element E Is stable. ( Which is Argon )

( Note, Elements which has 8 election on its outermost cell is stable. ( Helium is exception which is a noble gas but have 2 electrons in outermost cell )

4 — Element F , which is hydrogen. ( Hydrogen is the only element to not have any neutron )

5 — Element D ( Which is sodium )

6 — The element F ( Which is hydrogen ) Don't contain any neutron.

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What does it mean if an experiment is replicable ? Why is it important that experiment be replicable

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Answer:

When an experiment is replicanle it means it is able to be done again.

Explanation:

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3 years ago

Can someone plz help. Define solubility

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3 years ago

Which of the following redox reactions do you expect to occur spontaneously in the forward direction?

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Among the choices provide above the redox reactions do you expect to occur spontaneously in the forward direction is the below:

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3 years ago

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What is the purpose of adding base in the aldol condensation reaction? choose the best answer.

Paladinen [302]

Base is used in aldol condensation reaction

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6 0

3 years ago

A 50.0 mL sample of HCl required 25.81 mL of 0.1250 M KOH for neutralization. What is the molarity of the acid?

topjm [15]

Answer:

0.065M

Explanation:

The reaction expression is given as:

HCl + KOH → KCl + H₂O

Given parameters:

Volume of KOH = 25.81mL = 0.02581L

Molarity of KOH = 0.125M

Volume of HCl = 50mL = 0.05L

Unknown:

Molarity of the acid = ?

Solution:

To find the molarity of the acid, HCl, let us use the mole concept.

First, find the number of moles of the base, KOH;

Number of moles of KOH = molarity of KOH x volume of KOH

Number of moles of KOH = 0.125 x 0.0258 = 0.003225mol

From the balanced reaction equation:

1 mole of KOH reacted with 1 mole of HCl

0.003225mol of KOH will react with 0.003255mole of HCl

Molarity of HCl = $\frac{number of moles of HCl}{Volume of HCl}$

Molarity of HCl = $\frac{0.003255}{0.05}$ = 0.065M

8 0

3 years ago