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When a change makes a new substance you say a - has taken place?
A chemical reaction makes a new substance.
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
What are the five clues that suggests a chemical reaction is taking place?
first when there's a physical change in the substance second there will be a solution or a formula to that substance third is, it involves temperature fourth is change in color of the substance fifth is the bubbling of another substance is yet an another clue that a chemical reaction has occured.
What is the The energy required to start an enzymatic reaction?
The energy required to start an enzymatic reaction is called the activation energy. It is the energy needed to initiate the chemical reaction that the enzyme facilitates. Enzymes lower the activation energy required for a reaction to occur, making it easier and faster for the reaction to take place.
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 is enzyme and active sites?
Enzymes are biochemical catalyst that are chemically proteins. Active site is a place where the enzymatic chemical reaction takes place.
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.
Which type of reaction takes place between copper sulfate and potassium iodide?
A chemical reaction. When these two substances mix together they create an entirely new substance rather than just a physical change of one original substance.
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.
If you mix to clear liquids together and bubbles for what type of change would this indicate?
It indicates a chemical reaction because it changes from one substance to another.
When two or more substance combine is a chemical reaction to form one other substance that a reaction has taken place is?
Synthesis reaction: A + B (+ C) --> P(roduct)
Is reaction with acid a physical or chemical property?
A physical reaction is when no new substances are formed, there is a change of state eg ice melting to a liquid. A chemical change is when the reaction forms a new substance. eg gas bubbles. An acid reaction can be both. You need to look at the reaction taking place, look for change of state (physical) or any colour change or gas bubbles (chemical).
