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2 years ago

Do you agree or disagree for each one of them and provide evidence why??

Chemistry

1 answer:

sergiy2304 [10]2 years ago

6 0

Answer:

Disagree

Agree

Disagree

Explanation:

A chemical change is one in which a new kind of substance is formed. It is always accompanied by energy changes.

It is wrong to assert that all chemical changes are dangerous. In our body system, chemical changes are constantly happening.
Chemical changes shows the law of conservation of mass in that the amount of reactants and products are always the same.
Chemical reactions occur when two substances are chemically combined together.
Not all dissolution reaction are chemical changes. For example, when sugar dissolves in water, it is not a chemical change.

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An inverted pyramid is being filled with water at a constant rate of 45 cubic centimeters per second. The pyramid, at the top, h

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Answer:

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Explanation:

Length of the base = l

Width of the base = w

Height of the pyramid = h

Volume of the pyramid = $V=\frac{1}{3}lwh$

We have:

Rate at which water is filled in cube = $\frac{dV}{dt}= 45 cm^3/s$

Square based pyramid:

l = 6 cm, w = 6 cm, h = 13 cm

Volume of the square based pyramid = V

$V=\frac{1}{3}\times l^2\times h$

$\frac{l}{h}=\frac{6}{13}$

$l=\frac{6h}{13}$

$V=\frac{1}{3}\times (\frac{6h}{13})^2\times h$

$V=\frac{12}{169}h^3$

Differentiating V with respect to dt:

$\frac{dV}{dt}=\frac{d(\frac{12}{169}h^3)}{dt}$

$\frac{dV}{dt}=3\times \frac{12}{169}h^2\times \frac{dh}{dt}$

$45 cm^3/s=3\times \frac{12}{169}h^2\times \frac{dh}{dt}$

$\frac{dh}{dt}=\frac{45 cm^3/s\times 169}{3\times 12\times h^2}$

Putting, h = 4 cm

$\frac{dh}{dt}=\frac{45 cm^3/s\times 169}{3\times 12\times (4 cm)^2}$

$=13.20 cm/s$

13.20 cm/s is the rate at which the water level is rising when the water level is 4 cm.

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Explanation:

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Answer:

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Explanation:

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Do you agree or disagree for each one of them and provide evidence why??​

Do you agree or disagree for each one of them and provide evidence why??