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3 years ago

Tiguan moved a solid and a liquid together in a beaker. He

2 answers:

azamat3 years ago

8 0

“Baking soda mixed into vinegar, because the production of bubbles indicates that a new substance was formed.” This is the chemical change Tiguan observed.

Answer: Option B

<u>Explanation: </u>

In the given options, if Tiguan has mixed ice with oil, sugar dissolving in water and sand mixing with water, it is a physical change as the composition of the both the solid and liquid reactants will remain same.

The mixing of baking soda with vinegar leading to release of bubbles is the chemical change. Its state is completely different and also it did not inherit any properties from baking soda and vinegar.

So, the formation of new compound with different properties is termed as occurrence of chemical change between reactants. Thus, Tiguan has considered solid as baking soda and liquid sample as vinegar and observed the chemical change of formation of bubbles.

Lerok [7]3 years ago

8 0

Answer:

Answer: Option B

Explanation:

“Baking soda mixed into vinegar, because the production of bubbles indicates that a new substance was formed.” This is the chemical change Tijuan observed.

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n = 5 approx

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$\frac{v_1}{v}$ = e ( coefficient of restitution ) = $\frac{1}{\sqrt{10} }$

and

$\frac{v_1}{v} = \sqrt{\frac{h_1}{6.1} }$

h₁ is height up-to which the ball bounces back after first bounce.

From the two equations we can write that

$e = \sqrt{\frac{h_1}{6.1} }$

$e = \sqrt{\frac{h_2}{h_1} }$

So on

$e^n = \sqrt{\frac{h_1}{6.1} }\times \sqrt{\frac{h_2}{h_1} }\times... \sqrt{\frac{h_n}{h_{n-1} }$

$(\frac{1}{\sqrt{10} })^n=\frac{2.38}{6.1}$ = .00396

Taking log on both sides

- n / 2 = log .00396

n / 2 = 2.4

n = 5 approx

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