CHEMISTRY HIGH SCHOOL

Look closely at the valence electrons in all eight columns of your table from part C. Which element's location does notmatch the pattern shown in the table?
o helium (He)
o hydrogen (H)
sodium (Na)
O argon (Ar)

Answers

Answer 1
Answer:

Answer: helium(He)

Explanation: Helium has only 2 electrons in the outermost energy level, but all of the other elements in its column have eight.

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What point were the authors of the Declaration trying to make in the Preamble?

HELP.

Answers

Answer:

To explain why they are revolting against the king

Explanation:

Which of the following pieces of laboratory equipment is not directly used to make measurements?a. test tube
b. graduated cylinder
c. ruler
d. thermometer

Answers

Test are not directly used to make measurements, I mean you could use them to put 4 mL of a substance in, but not to measure out 4 mL, like with graduated cylinders. Rulers can be used to measure the length of something, like the number of inches. And a thermometer will help you measure the temperature of something.

Answer:

A. test tube

Explanation:

edg 2022

Which formula represents a polar molecule?
(1) O2
(2) CO2
(3) NH3
(4) CH4

Answers

Answer: Option (3) is the correct answer.

Explanation:

A molecule is polar when the net dipole moment of molecule is zero. When an electronegative atom is attached to an electropositive atom then the electronegative atom pulls the shared pair of electrons more towards itself.

As a result, the movement of electrons is more towards the electronegative atom and the dipole moment becomes zero. This will also induce partial positive and partial negative charge on electropositive and electronegative atom.

On the other hand, O_(2), CO_(2), and CH_(4) are covalent compounds and does not have a net zero dipole moment.

Thus, we can conclude that out of the given options NH_(3)  represents a polar molecule.

how to figure out the normality/equivalent weight/equivalents of chemicals in a balanced equation (assuming necessary data given)

Answers

How to figure out the normality/equivalent weight/equivalents of chemicals in a balanced equation? (assuming necessary data given)

Answer: First we have to understand that the normality of a solution is the gram equivalent weight of a solute per liter of solution. To find it we simply will have to have the necessary data to see the balanced equation.

I hope it helps, Regards.
normality= molarityxequivalent

Eg: H2SO4 + Na2OH ⇒ Na2SO4 + 2H2O

H2SO4 can neutralize 2 M of NaOH so equivalent of H2SO4 is 2 and that of NaOH is 1

For ions, equivalent is the number of charge and for acids or bases it is the acidity or basicity. 

Equivalent weight is weight of 1 equivalent of any compound

You are given 50.0 ml of 1.50 m hno3. how many ml of 0.81 m naoh are needed to neutralize it?

Answers

V(HNO₃) = 50.0 mL in liters = 50.0 /1000 =0.05 L
M(HNO₃) = 1.50 M

Number of moles HNO₃ :

n = M x V

n = 1.50 x 0.05

n = 0.075 moles of HNO₃

HNO₃ + NaOH = H₂O + NaNO₃

1 mole HNO₃ -------- ---1 mole NaOH
0.075 moles HNO₃ ---- ?

moles NaOH = 0.075 * 1 / 1

 = 0.075 moles of NaOH

V ( NaOH ) :

M = n / V

0.81 = 0.075 / V

V = 0.075 / 0.81

V = 0.0925 L or  92.5 mL 

hope this helps!

Mendeleev is the scientist who first developed the atomic model

the atomic theory

elements

the periodic table

Answers

Dmitri Mendeleev is the scientist who first developed the periodic table.

He is a Russian chemist and inventor who formulated the periodic law and created the periodic table of elements. He corrected some of the properties of the elements. Now, we can easily locate the elements we wanted to identify. With the help of Mendeleev, studying chemistry is not that difficult because he tried to simplify some of the concept that was complex before.
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