4 years ago

Which of these is an example of a physical change

Chemistry

2 answers:

Diano4ka-milaya [45]4 years ago

7 0

Grinding pepper you're changing its physical form when you mash it up<span />

Rashid [163]4 years ago

4 0

<span>3) which is an example of a physical change

</span><span>a) grinding pepper</span>

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1 year ago

A sample of the mineral hematite Iron (III) oxide has a mass of 12.4g. How many moles of the mineral are present?

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Thus problem is providing us with the mass of iron (III) oxide as 12.4 g so the moles are required and found to be 0.0776 mol after the calculations:

<h3>Mole-mass relationships:</h3>

In chemistry, we use mole-mass relationships in order to calculate grams from moles and vice versa. In this case, since we are given the mass of iron (III) oxide as 12.4 g one can calculate the moles by firstly quantifying its molar mass: