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2 years ago

7

Which of the following is NOT an indicator of a chemical reaction?

1 answer:

aliina [53]2 years ago

3 0

Answer:

c

Explanation:

The changing of color of a substance is not necessarily an indicator of a chemical change. For example, changing the color of a metal does not change its physical properties. However, in a chemical reaction, a color change is usually an indicator that a reaction is occurring.

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A calorimeter uses the temperature change of water to determine the _____ of another substance.

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A football player kicks a field goal from a distance of 45 m from the goalpost. The football is launched at a 35° angle above th

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2 years ago

A 66-foot-tall woman walks at 55 ft/s toward a street light that is 2424 ft above the ground. What is the rate of change of th

I am Lyosha [343]

Answer:

a. $\frac{dx}{dt}=20ft/s$

b. $\frac{d(x+L)}{dt}==25ft/s$

Explanation:

Using the triangle theorem both triangle the woman makes between the light so the rate of change of length can use geometry first

$tan(\beta)=\frac{24ft}{L+x}=\frac{6ft}{x}$

Solve to find the rate relation

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The answer is B

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