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If the mass of all objects before a chemical change is 200kg what would the mass be after the chemical changed occurred?
Wiki User
∙ 13y ago
There will be a gain in mass.....but you can't predict the new change in mass unless you weigh the products after the chemical change occurred.
Wiki User
∙ 13y ago
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What is the only sure way to prove that a chemical reaction has occurred?
Signs of chemical reactions may be: - Gas was formed - Formation of a precipitate and water - Reactants disappeared - products were made - energy is released - properties of reactant and products are different
Is glass breaking a chemical or physical change and why?
Physical change because before and after breaking a glass, the glass is still SiO2 (Silicon): it's chemical makeup is not changed by the breakage.
Is developing film a chemical or physical change?
chemical change :-)
What are the four occurrences indicate a chemical reaction has occurred?
A chemical reaction can result in any or all of the following: - a change in temperature (up or down) - a change in color - a smell that wasn't there before - the formation of bubbles (indicating the production of a gas) - the formation of a precipitate
What do you know about types of atoms before and after a reaction?
Assuming that you are referring to chemical reactions, we know that atoms are not changed by chemical reactions (except for their oxidation states). That means that all the same types of atoms are present after the reactions as were there before the reactions. The type of an atom is determined by the number of protons in its nucleus.
How does a chemical equation show that a chemical reaction has occurred?
A chemical equation shows that chemical reaction has occurred as new substances have been formed from the reagents. A chemical equation has two sides before reaction and after reaction, if there is any change from the before reaction side to the after reaction side, it indicates that a chemical reaction has just occurred.
What is present after a chemical reaction?
That depends on the chemicals present before the chemical reaction and sometimes the conditions under which the chemical reaction occurred.
Are chemical reactions a chemical change of original substances before a chemical reaction takes a place?
Substances are changed only after the beginning of a chemical reaction.
Is it true that in a chemical reaction reactants are changed into products?
no, it is before the reaction
What is the only sure evidence for a chemical reaction?
The only way to be sure a chemical reaction or change has occurred is to test the composition of a sample before and after a change.
What is the only sure way to prove that a chemical reaction has occurred?
Signs of chemical reactions may be: - Gas was formed - Formation of a precipitate and water - Reactants disappeared - products were made - energy is released - properties of reactant and products are different
Is glass breaking a chemical or physical change and why?
Physical change because before and after breaking a glass, the glass is still SiO2 (Silicon): it's chemical makeup is not changed by the breakage.
Chemical brothers and dust brothers the same?
Yes, and no. The Chemical Brothers used to be called the dust brothers. there was another group called the dust brothers who got their name before the chemical brothers did, so they got charges and changed their name to the chemical brothers
Is developing film a chemical or physical change?
chemical change :-)
What was before the Gulf War?
The Persian Gulf War occurred from 1990-1991, so ostensibly anything that occurred in 1989 or earlier occurred before the Gulf War.
Substances that are changed vwhen they become involed in chemical reactions are called?
lactic acids check your spelling before posting another answer it threw me off
What are the four occurrences indicate a chemical reaction has occurred?
A chemical reaction can result in any or all of the following: - a change in temperature (up or down) - a change in color - a smell that wasn't there before - the formation of bubbles (indicating the production of a gas) - the formation of a precipitate
