The number of molecules in some water isn't affected by changing its temperature. But to know if you have the same number of molecules in two water samples, you need to compare their masses, not their volumes. When you heat some cool water, it expands. (When you slightly warm some ice-cold water, it contracts a little, but let's keep this simple.) So hot water takes up more space than cold water. The amount of space something takes up is called volume. If you were to have 2 cups of water, one of hot water and one of cold water with equal volumes, the cold water would have more molecules.
<span>Hot and cold water are made of the same type of molecules. Each molecule has one oxygen and two hydrogen atoms. The difference between them is the speed of the molecules jiggling around. </span>
Answer:
They are different because ethanol is a compound that is made by a certain amount of carbon, oxygen and hydrogen, these are the elements that made up ethanol.
Explanation:
Think of it like this ethanol is a cake and carbon, oxygen and hydrogen is the eggs, flours and sugar that is used to make the cake.
Answer:
False. It occurs about every 24 hours.
Explanation:
A circadian rhythm is a natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours.
Answer:
Eye colour
Explanation:
Its controlled by the parents genes
Metamorphic rock
Explanation:
Using the attached image, rock A can be shown to be a metamorphic rock.
A metamorphic rock is a changed rock.
- In a rock cycle, a good overview of rocks are converted and transformed from one form to another is depicted.
- Molten magma cools and solidifies to form rock type B called igneous rocks.
- When B is subjected to weathering and materials collected are compacted, it forms sedimentary rock type C.
- Under intense pressure and temperature, rock type A occurs and are called metamorphic rocks.
- Examples of such rock types are slate, marble, gneiss, schist, etc.
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Metamorphic processes brainly.com/question/869769
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