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What is a substance which helps make a chemical change happen but is not changed itself in the process is called?
Catalyst: a substance which speeds up a chemical change or enables the change to take place at a lower tempature, and is not changed or used up in the reaction.
When a chemical change is in place does no new substance form?
No, a new substance is normally formed
What is the definition chemical change?
Chemical ChangesAs opposed to a physical change, chemical changes are present when the substance undergoes a chemical reaction and produces a new substance. A chemical change is a chemical reaction that will always take place for there to be a chemical change. Signs that a reaction is taking place: Formation of gases (bubbles), Color change, production of heat or light, and the formation of a solid. a change in composition and characteristics of matter.new substance maybe formed.original substance and form may be lost.new color and shapeExamplesFermentationPhotosynthesisRusting nailSpoiling milkDigesting food
How could you decide whether the dissolving of sugar in water is a physical or chemical change?
You can evaporate the water and recover the sugar unchanged. A chemical change means a chemical reaction has taken place and changed the substance chemically. A physical change means that a solid has become a liquid such as dissolving sugar.
What take place when a substance undergoes a chemical change?
an explosion (fact)
Whats the difference between a physical change and a chemical change?
Physical change- A physical change can be reversed and the object changed is still the same object. The Molecular structure of this object is not changed to make another substance. An example of this would be cutting paper with scissors or shattering glass on the floor. Chemical Change- A chemical change usually cannot be reversed. After this type of reaction takes place a new substance is created. The molecular structure of the object is changed to make a new substance. An example of this would be burning wood, rusting, or mixing vinegar and baking soda. Tell tale signs of a chemical change is that heat, light, and gasses are given of during the reaction. simpler- physical change- state change like liquid to gas. the previous person is right about a chemical change.
Does volume not change when a chemical reaction takes place?
The volume is changed.
When a change makes a new substance you say a - has taken place?
A chemical reaction makes a new substance.
How does matter chemically change?
The chemical changes take place on moleculer space. A chemical change form (or) produce a new substance.
When sugar is heated for a short time a thick colorless liquid substance is formed What kind of change takes place?
The change that takes place when sugar is heated to form a thick, colorless liquid substance is a physical change. This is because the molecular structure of the sugar remains the same even though its physical state has changed from solid to liquid.
Why is a phase change a physical change and NOT a chemical change?
Because no chemical reaction is taking place. It is the same substance, just in a different state of matter.
What does the word physical change mean?
A physical change means that only the appearance of the substance has changed. So if your tear up a piece of paper, its still paper so a physical change has taken place. If you heat or freeze water its only a change of state so its still a physical change. So long as the molecular or chemical structure of the atom/substance does not change it will always be a chemical change. H20 will always be H20.
