Physics, 15.10.2019 03:50 cheergirl2854

When baking soda and vinegar react, the surface bubbles. what does this most likely indicate?

a: a chemical change, because a precipitate is being formed
b: a chemical change, because a gas is being formed
c: a non-chemical change, because a precipitate is being formed
d: a non-chemical change, because a gas is being formed

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Answer from: hosteenimport21

The correct answer is B: a chemical change, because a gas is being formed.

Explanation:

The chemical equation of baking Soda reacting with Vinegar is:

CH3COOH + NaHCO3 = CH3COONa + CO2 + H2O

As you can see in the process CO2 ( carbon dioxide ) is being released. This is a chemical change that causes a gas being formed

Answer from: artic0203

Answer;

B: a chemical change, because a gas is being formed

Explanation;Production or formation of a gas is an example of an indicator that a chemical reaction has taken place, Formation of a gas in a chemical reaction is marked by production of bubbles or what is known as effervescence.

Other indicators of a chemical reaction include;

Color changeOdor changeChange in temperatureFormation of a precipitate

Therefore, a reaction between baking soda and vinegar is an example of a chemical reaction ,due to the production of bubbles which indicates formation of a gas.

Answer from: Quest

Iwas going to ask that quesytion sorry dude i dont know : ( : /

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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