Physics, 30.01.2020 04:55 blazenrais

Which are rules for writing chemical formulas? check all that apply. identify the positive ion and charge balance the charges write the negative ion first identify the negative ion and charge use the number of ions as the ion’s superscript

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Answer from: babyphoraaaaa

The correct statements are

1) Identify the positive ion and charge

2) Identify the negative ion and charge

3) Balance the charges

Explanation:

While writing the chemical formula :

Look for the positive ion (cation) and its charge.Look for the negative ions (anion) and its charge.After this charges are balanced to maintain neutrality in a compound.And use the number of ions as the sub script of the ion's in a chemical formula.

So, from the given statements the correct statements are:

1) Identify the positive ion and charge

2) Identify the negative ion and charge

3) Balance the charges

Answer from: Quest

answer: i'm not sure which is which for i get confused on it all the time but i can tell you that the answer lies with the convex and concave devices. i hope this you. have a good day and best of luck to you!

explanation:

For which optical devices does d sometimes have a positive value?

Answer from: Quest

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

$x(t)=ax(x-6)$

where $a$ is unknown. because the position is parabolic, there is symmetry about the midpoint at $t=3$ , and we know that

$x(3)=10\implies -9a=10\implies a=-\dfrac{10}9$

so that the position function is

$x(t)=-\dfrac{10}9x(x-6)$

which means the velocity is

$v(t)=\dfrac{\mathrm dx}{\mathrm dt}=-\dfrac{20}9x+\dfrac{60}9$

then the total distance traveled is

$\displaystyle\int_{t=0}^{t=6}|v(t)|\,\mathrm dt=\left\{\int_{t-0}^{t=3}-\int_{t=3}^{t=6}\right\}v(t)\,\mathrm dt=20$

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at $x=0$ and ends at $x=0$ , so its displacement is 0.

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Which are rules for writing chemical formulas? check all that apply. identify the positive ion and...

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