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irinina [24]
3 years ago
13

Sahil watched a demonstration in which a scientist combined two substances in a sealed container and analyzed the results. The e

nding substances did not look the same as the starting substances.Sahil was given a diagram with the repeating groups of atoms that make up the starting substances, plus information about the properties of the starting and ending substances. He created a model of the repeating groups of atoms that might make up the two ending substances.Does his model correctly show why the properties of the ending substances are different from the properties of the starting substances? Describe what could be correct or incorrect about his model.

Chemistry
1 answer:
11111nata11111 [884]3 years ago
7 0

Answer:

amira's model correctly demonstrates how the properties changed with the rearrangement of the atoms. However not all atoms are accounted for. There is a missing reactant.

Explanation:

Samira's model correctly demonstrated how the atoms in two compounds reacted to form two new products. However, the elements present in the reactants side should be the elements that make up the new products in the product side. But as the diagram shows, Sameera has mistakenly added a new element to one of her products which will be wrong.

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3 years ago
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34kurt

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Medieval number one. There you havt it.

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What mass of zinc (molar mass 65.4 g moll) does it take to produce 0.50 mole of H2(g)?
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32.7 g of Zn

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We'll begin by writing the balanced equation for the reaction. This is illustrated below:

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From the balanced equation above,

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Next, we shall determine the number of mole of Zn required to produce 0.5 mole of H₂. This can be obtained as follow:

From the balanced equation above,

1 mole of Zn reacted to produce 1 mole of H₂.

Therefore, 0.5 mole of Zn will also react to produce to 0.5 mole of H₂.

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Finally, we shall determine the mass of 0.5 mole of Zn. This can be obtained as follow:

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Mass of Zn = 32.7 g

Thus, 32.7 g of Zn is required to produce 0.5 mole of H₂.

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