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changes in its appearance ie colour and state
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What is the evidence that a chemical reaction took place when silver nitrate was mixed with ammonium chloride?
A white precipitate of silver chloride (AgCl) is formed.
What is the evidence that a chemical reaction took place when zinc mixed with HCl?
Yes, and zinc chloride and hydrogen are obtained.
What happens when a compound undergoes a chemical reaction?
When a compound undergoes a chemical reaction, it is forever altered. It can never go back to the way it was before the reaction took place.
List two observations from the vinegar lab that imdicates a chemical reaction took place?
Bubbles
What are the substances that react in chemical reaction called?
1. Initial substances in a chemical reaction are called reactants.2. The obtained final substances are called products or resulting substances.
What is the evidence that a chemical reaction took place when zinc mixed with HCl?
Yes, and zinc chloride and hydrogen are obtained.
What is the evidence that a chemical reaction took place when silver nitrate was mixed with ammonium chloride?
A white precipitate of silver chloride (AgCl) is formed.
What is the chemical reaction that took place in heating a sugar?
caramelization :D
What are the chemical reaction that took place to make Colgate toothpaste the product?
taulom
What happens when a compound undergoes a chemical reaction?
When a compound undergoes a chemical reaction, it is forever altered. It can never go back to the way it was before the reaction took place.
How an element produce heat?
A chemical reaction took place creating a new element.
List two observations from the vinegar lab that imdicates a chemical reaction took place?
Bubbles
Does a chemical reation produce new substances?
"New substances" is a vague description of what happens in a chemical reaction. Simply put though, yes. An example of this would be if you took baking powder and vinegar and mixed them together, the resulting chemical reaction would create Carbon Dioxide. That is a new substance, it wasn't there until the reaction took place.
What are the substances that react in chemical reaction called?
1. Initial substances in a chemical reaction are called reactants.2. The obtained final substances are called products or resulting substances.
How did invention of fire took place and when?
Fire was not "invented" - it is a chemical reaction that has taken place long before any humans were involved. Human beings have had the ability to control fire for hundreds of thousands of years, if not longer. Nobody knows exactly when and how this first took place - the only evidence we have is the use of fire in eg. making tools that we can find through archeological digs.
Is dissolving salt in water a physical or chemical change?
Dissolving salt in water is a physical change- no chemical reaction took place. If the water evaporates, the salt is still there.
How do you know that a chemical change took place when sodium and clorine join to form table salt?
it is an ionic and exothermic reaction i.e. when it will take place heat will be liberated
