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Yuri [45]
4 years ago
12

If a substance changes color, what has most likely happened?A pressurized change has taken place.

Chemistry
2 answers:
Zigmanuir [339]4 years ago
8 0

Answer:

Probably a Chemical change, as it is what happens when a substance turns into another substance. I am not 100% certain

Explanation:

Salsk061 [2.6K]4 years ago
4 0

Answer:

B

Explanation:

changing color is a form of a physical change

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How would doubling the concentration of crystal violet affect the reaction rate?
Helga [31]

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R = k [A]^x [B]^y

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4 years ago
A mileage test is conducted for a new car model. Thirty randomly selected cars are driven for a month and the mileage is measure
Leni [432]

Answer:  (27.81,\ 29.39)

Explanation:

Given : Sample size : n= 30 , it means it is a large sample (n≥ 30), so we use z-test .

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Critical value: z_{\alpha/2}=1.96

Sample mean : \overline{x}=28.6

Standard deviation : \sigma=2.2

The formula to find the confidence interval is given by :-

\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}

i.e. 28.6\pm (1.96)\dfrac{2.2}{\sqrt{30}}

i.e. 28.6\pm 0.787259889321

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Hence, the 95% confidence interval for the mean mpg in the entire population of that car model = (27.81,\ 29.39)

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3 years ago
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