2 years ago

A 5 cm3 piece of aluminum has a higher density than a 10cm3 of aluminum. True or false

Chemistry

1 answer:

Lubov Fominskaja [6]2 years ago

3 0

Density stays the same, false

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Two substances A and B, initially at different temperatures, are thermally isolated from their surroundings and allowed to come

Elden [556K]

Answer:

Explanation:

For solving this we need a heat balance

$Q_{a} = Q_{b}\\m_{a}*C_{a}*\Delta T_{a} = m_{b}*C_{b}*\Delta T_{b}$

By changing the corresponding relations, we have

$m_{a}*C_{a}*\Delta T_{a} = \frac{1}{2}m_{a}*4C_{a}*\Delta T_{b} \\\\\\$

By cancelling similar factor, we obtain

$\Delta T_{a} = 2 \Delta T_{b}\\\frac{\Delta T_{a}}{\Delta T_{b}} = 2\\$

Which means that the change of temperature in A is twice the change of B

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3 years ago

How many elements compose the majority of rock-forming minerals?

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10 elements compose the bulk of rock forming minerals

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4 years ago

Might be hard to read but i do not understand what the “K” means.

alexdok [17]

it means kinetic energy

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4 years ago

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Explanation:

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3 years ago

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Answer:

A scientific problem is something you don't understand but you can do an experiment to help you understand. Scientific problems are usually based on observation of scientific phenomena. Here is some advice to help you identify a scientific problem you can address by designing your own experiment.

Explanation:

Example of a scientific problem are Clean Drinking Water.

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3 years ago