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Leaves change colors for the following reasons:
Once the water supply is cut off in the fall, no more chemical reactions take place for the leaves to make their own food.
As the chlorophyll dissipate from the leaves and there is no water, the leaves begin to dry up.
Once the manufactoring of food stops completely, the leaves dry up and fall from the tree.
The water is turned on by nature in the spring and the leaves begin to make more food and give off oxygen.
What else can I help you with?
Do you think a chemical reaction has taken place Can you explain your reasoning behind your conclusion?
Yes, a chemical reaction has likely taken place if there is a change in the chemical composition of the substances involved. This can be observed through the formation of new substances, changes in color, temperature, or the release of gas. These are all indicators that a chemical reaction has occurred.
If dish of sugar and water solution is left in the sun after a few days the solution has disappeared and a white residue remains on the dish Has a physical or chemical change taken place explain?
Yes, A physical change has taken place. The water has evaporated and left the sugar. Neither substance has changed its identity. GOOD LUCK ON YOUR TEST!
When paper turns yellow brown upon exposure to sunlight what type of change has taken place a chemical or physical change?
A chemical change has taken place. The exposure to sunlight causes the paper to undergo a chemical reaction, breaking down the molecules in the paper and causing the color change to occur.
What are four things that indicate that a chemical change may have taken place?
Change in color: If the substance changes color during a reaction, it may indicate a chemical change. Formation of gas: Production of gas bubbles, fizzing, or bubbling is a sign of a chemical change. Temperature change: Significant heat or cooling effects can indicate a chemical reaction is occurring. Formation of a precipitate: When a solid substance forms in a solution, it suggests a chemical change has taken place.
Is a erosion caused by wind a chemical change?
No, erosion caused by wind is a physical change, not a chemical change. The wind is simply moving particles of rock or soil from one place to another without altering their chemical composition.
Explain how wood burning in a fire place undergoes a chemical change?
Burning is an oxydation reaction so a chemical change.
Is wood and leaves that are left to rot and to form humus a chemical or physical change?
Both. In breaking down into humus, both chemical and physical change takes place.
In a candle explain both changes using the big idea of energy?
When a candle is burnt a physical AND chemical change takes place. Its a physical change when the wax is being melted because the chemical structure has not change, meaning it cannot be a chemical change. Its also a chemical change because you are burning the string. When you burn something the chemical structure DOES change, meaning it is a chemical change.
If a piece of metal bubbles was place in acid is that a chemical change?
No, it is not a chemical change. For example, if you put gold bubbles into any single acid, no chemical change will take place.
What identifies a chemical change has taken place?
Signs that a chemical change has taken place include the formation of a gas, the formation of a precipitate, a change in temperature, and a change in color.
Do you think a chemical reaction has taken place Can you explain your reasoning behind your conclusion?
Yes, a chemical reaction has likely taken place if there is a change in the chemical composition of the substances involved. This can be observed through the formation of new substances, changes in color, temperature, or the release of gas. These are all indicators that a chemical reaction has occurred.
When cheese is cut into a slices does a chemical formula takes place.?
I assume you mean chemical "change" and the answer is no, it is a physical change that takes place.
What are facts about physical and chemical change?
Chemical changes take place on the molecular level
Is leaves produce oxygen a physical or a chemical change?
Its a chemical change. Leaves breathe in carbon dioxide. They use it to carry out the process of photosynthesis that is preparation of food for growth. Chemical changes involving salts, water, carbon dioxide take place in the presence of sunlight that results in the liberation of oxygen into the atmosphere. At night however in the absence of sunlight it breathes in oxygen to prepare food, since photosynthesis is not possible due to absence of sunlight.
Is melting ice into water a chemical change?
No. It is a physical change. The chemical formula for water is H2O, and that is also the chemical formula for ice. So there is no chemical change taking place, only a change in the state of matter.
What kind of change that takes place when sugar is heated at a short time?
a chemical change take a place
Is dissolving air in water a chemical change?
It is a physical change, and now you have a mixture (or solution). No chemical reactions took place to make this change.
