Answer: Molecules of gas are usually far apart and can be compressed unlike molecules of liquids.
Explanation:
The molecules of gases are usually far apart, moving freely and randomly, occupying extra space in the containing vessel. Hence, when compressed to become closely packed, gases have lower volume.
However, unlike gases, the molecules of a liquid are restricted, move less freely and occupy no extra space. Hence, liquids cannot be compressed, and their volume remains the same in their containing vessel.
Answer:
endothermic reaction
Explantion:
The definition for endothermic is:
describing a process that involves the absorption of energy from the surroundings by substances undergoing change.
Think of <em>en-</em>dothermic as energy entering and <em>ex-</em>othermic as energy exiting.
The insulating ability of a substance is a physical characteristic and not a chemical one. A physical property is a characteristic that distinguishes one type of matter from the other and can be observed without changing the identity of the substance. A chemical property describes how one substance changes into another in a chemical reaction.
Answer: The correct answer is X represents water and Z represents oxygen.
Explanation:
Cellular respiration is defined as the breaking of sugar into a form that a cell can use as energy. This breaking of glucose takes place in the presence of oxygen gas.
Equation for the cellular respiration is given by the chemical reaction:
Here, 
= Glucose
For the given chemical equation in the question,
Z represents oxygen gas
X represents either carbon dioxide or water
Y represents either carbon dioxide or water
Hence, the correct answer is X represents water and Z represents oxygen.
