Answer:
The solution was heated.
to distill the ethanol that formed in the flask.
the ethanol evaporated and then condensed in the receiving flask.
Explanation:
In a physical change, the form of matter is altered but the substance stays the same (same chemical identity). The changes of state are examples of physical changes.
In a chemical change, a chemical reaction occurs and a substance transforms into another one.
From the text:
- <em>In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol.</em> Chemical change. The glucose reacts to form carbon dioxide and ethanol.
- <em>The solution was heated.</em> Physical change. The increase in the temperature does not imply a change in the chemical identity.
- <em>by burning natural gas in a Bunsen burner</em>. Chemical change. Burning means a combustion is taking place, in which a substance reacts with oxygen to produce carbon dioxide and water.
- <em>to distill the ethanol that formed in the flask.</em> Physical change. Ethanol is isolated but its nature does not change.
- <em>the ethanol evaporated and then condensed in the receiving flask. </em>Physical change. These are changes of state.
- <em>some of the glucose decomposed into a black carbon deposit on the inside of the flask</em>. Chemical change. Glucose is consumed and carbon is produced.
Halides is the term given to the ions of halogens. Halogens are the second-to-the-last column or period in the periodic table. Examples are chlorine, fluorine, bromine and iodine. Halides are all soluble in water except when combine with silver, lead and mercury. <em>Therefore, the generalization we can make is that silver halides are insoluble in water,</em>
Heavy rainfall causes a landslide. Hence, option A is correct.
<h3>What is a landslide?</h3>
A landslide is defined as the movement of a mass of rock, debris, or earth down a slope.
Water can trigger landslides and mudslides because it alters the pressure within the slope, which leads to slope instability.
Consequently, the heavy water-laden slope materials (soil, rock, etc.) will succumb to the forces of gravity.
Hence, option A is correct.
Learn more about the landslide here:
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