Question

Physics help please

Answer 1

@Astrophysics

Answer 2

Which best explains why elements with a completely full outer shell of electrons do not usually bond with other elements to form compounds?

A.
A full outer shell of electrons indicates a stable state, making the formation of compounds unnecessary. The full outer shell was obtained by releasing electrons instead of forming a compound.

B.
These elements have obtained electrons from other elements without bonding to create a full outer shell of electrons, and a stable state.

C.
Elements with a completely full outer shell of electrons are in their most stable state. Therefore, achieving stability through the formation of compounds is not necessary.

D.
Because electrons orbit some atoms in three dimensional space, they move to different orbitals to stabilize the atom, making the formation of compounds unnecessary.
I got A

Answer 3

@Michele_Laino

Answer 4

am i right?

Answer 5

I think that the stability also can be obtained by gaining electrons

Answer 6

so its B?

Answer 7

no, I think that option B is a wrong option, please consider this example:

here the atom of oxygen and the two atoms of chlorine, share some electrons, so all of them can reach the stable state like a noble gas

Answer 8

okay

Answer 9

so, what is the right option?

Answer 10

D?

Answer 11

I think it is option C

Answer 12

as we can see both type atoms of chlorine and oxygen don't have a completely full outer shell of electrons

Answer 13

oh yeah i see that

Answer 14

also, consider this example:

Answer 15

so, both of fluorine atoms, reach the state of noble gas Ne

Answer 16

yeah

Answer 17

so C for sure

Answer 18

i have a couple more that i need help with, if you could

Answer 19

This is the equation for the formation of magnesium chloride.

Mg(s) + 2HCl(l) → MgCl2(aq) + H2(g)

Which are the reactants and the products in this reaction?

A.
The reactants are MgCl2 (magnesium chloride) and H2 (hydrogen); the products are Mg (magnesium) and HCl (hydrochloric acid).

B.
The reactants are Mg (magnesium) and H2 (hydrogen); the products are MgCl2 (magnesium chloride) and HCl (hydrochloric acid).

C.
The reactants are Mg (magnesium) and HCl (hydrochloric acid); the products are MgCl2 (magnesium chloride)and H2 (hydrogen).

D.
The reactants are MgCl2 (magnesium chloride) and HCl (hydrochloric acid); the products are Mg (magnesium) and H2 (hydrogen).
I got C

Answer 20

that's right!

Answer 21

okay. maybe like 2 or 3 more if you have time :)

Answer 22

ok! :)

Answer 23

What number should be substituted for the question mark to balance the equation and why is that the correct number?

2C2H6 +?O2 → 4CO2 + 6H2O + heat

A.
The number 4 is needed to balance the equation. The right side of the equation shows 8 oxygen atoms, so the left side needs 4 × O2.

B.
The number 3 is needed to balance the equation. The right side shows 6 oxygen atoms, so the left side needs 3 oxygen atoms.

C.
The number 7 is needed to balance the equation. The right side of the equation shows 14 oxygen atoms, so the left side needs 7 × O2.

D.
The number 5 is needed to balance the equation. The right side shows 4 oxygen atoms in carbon dioxide and 6 oxygen atoms in water for a total of 10 oxygen atoms.
I got C

Answer 24

that's right!

Answer 25

what is your answer?

Answer 26

C

Answer 27

that's right!
speed is given by the slope of the line, so more is the slope and more is the speed

Answer 28

I think A

Answer 29

because the slope is the steepest

Answer 30

here we have this slope: distance/time, which is a speed not an acceleration

Answer 31

along the line CD, the object is at rest

Answer 32

since the distance doesn't change

Answer 33

So D

Answer 34

no, option D is a wrong option.
please note that, along the line AB the speed is constant, so acceleration=0, the same occurs along the line CD, since here the object is at rest

Answer 35

so, what can you conclude?