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when chemical w is added to a liquid, the chemical breaks down into sub…

Question

when chemical w is added to a liquid, the chemical breaks down into substances x, y, and z. it is not possible to break down substances x, y, and z into simpler substances. what conclusion is supported by this evidence?

substances x, y, and z are compounds.
substances x, y, and z are elements.
chemical w is an element.
chemical w is a pure substance.

Explanation:

Brief Explanations

To solve this, we recall the definitions of elements and compounds. An element is a substance that cannot be broken down into simpler substances by chemical means. A compound is made of two or more elements and can be broken down. Chemical W breaks down into X, Y, Z, so W is a compound (not an element). X, Y, Z can't be broken down further, so they are elements. Also, W is a pure substance (since it's a compound, which is a type of pure substance), but the most direct conclusion from the inability to break X, Y, Z is that they are elements. Let's analyze each option:

  • "Substances X, Y, and Z are compounds": Compounds can be broken down, but X, Y, Z can't, so this is wrong.
  • "Substances X, Y, and Z are elements": Elements can't be broken down into simpler substances, which matches X, Y, Z's property, so this is correct.
  • "Chemical W is an element": Elements can't be broken down, but W breaks down into X, Y, Z, so W is not an element, this is wrong.
  • "Chemical W is a pure substance": While W is a compound (hence a pure substance), the key evidence here is about X, Y, Z not being breakable, so the most supported conclusion from that evidence is about X, Y, Z being elements. But let's check again: W breaks down, so W is a compound (pure substance). But the question is which conclusion is supported by the evidence (that X, Y, Z can't be broken down). The evidence about X, Y, Z not being breakable supports that they are elements. However, let's re - evaluate the options. Wait, W is a compound (so pure substance), but the main point from the given evidence (X, Y, Z can't be broken down) is that X, Y, Z are elements. But let's check the options again:

Wait, let's re - examine the definitions:

  1. Element: A pure substance that cannot be broken down into simpler substances by chemical reactions.
  1. Compound: A pure substance made of two or more elements chemically combined, can be broken down into elements.

Given: W breaks down into X, Y, Z (so W is a compound, since it can be broken down into simpler substances). X, Y, Z can't be broken down, so they are elements.

Now, let's check each option:

  • Option 1: X, Y, Z can't be broken down, so they are not compounds (compounds can be broken down). Eliminate.
  • Option 2: X, Y, Z can't be broken down, so they fit the definition of elements. This is correct.
  • Option 3: W breaks down, so W is not an element (elements can't break down). Eliminate.
  • Option 4: W is a compound (so a pure substance), but the evidence about X, Y, Z not being breakable is more directly supporting that X, Y, Z are elements. However, let's see: The evidence is "it is not possible to break down substances X, Y, and Z into simpler substances". So the conclusion supported by this evidence is that X, Y, Z are elements.

But wait, also, W is a compound, so W is a pure substance. But the question is which conclusion is supported by the evidence. The evidence is about X, Y, Z not being breakable. So the most direct conclusion from that evidence is that X, Y, Z are elements.

But let's check the options again. Wait, maybe I made a mistake. Let's see:

The evidence is: "the chemical (W) breaks down into substances X, Y, and Z. It is not possible to break down substances X, Y, and Z into simpler substances."

So from "not possible to break down X, Y, Z", we can conclude X, Y, Z are elements (since elements can't be broken down).

Now, let's check the options:

  • Option 2: "Substances X, Y, and Z are elements" – this matches the property of X, Y, Z (can't be broken down).
  • Option 4: "Chemical W is a pure substance" – W is…

Answer:

B. Substances X, Y, and Z are elements