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melisa1 [442]
3 years ago
9

Allison wants to calculate the denisty of a rock. To do this, what tools will she need to measure

Physics
1 answer:
fredd [130]3 years ago
6 0

Answer:

Explanation:

Allison can measure the mass of the rock by using a scale. An electronic beam balance will be able to give her the mass of the rock to a fairly accurate degree.

To go about measuring the volume of the rock, an indirect approach has to be adopted since the rock is not regular in shape.  Allison would have to adopt a principle that explains that the volume a solid body displaces when immersed in a pool of liquid, is directly equal to the volume of the solid itself.

This means that if the stone is placed in a beaker of water containing an already measured volume of water, the increase in the volume of the water when the stone is immersed is equivalent to the volume of the stone.

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trapecia [35]

Explanation:

The balanced chemical equation is given as:

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А  There are two peroxide molecules on the reactant side.

The statement is correct because the left hand side is the reactant side. We can read the reaction as;

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Since the chemical equation is balanced, choices D and E are correct. The reaction will have equal number of molecules and atoms on both sides of the expression.

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