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2AgNO3(aq) + CaBr2(aq) 2AgBr(s) + Ca(NO3)2(aq) estion…
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∙ 9y ago
Anonymous
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2CH3OH(l) + 302(g) -- 2CO2(g) + 4h2O(l)
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Which reactions shows a physical change?
Burning coal is a chemical reaction, a chemical change; but the solid reactant is transformed in gaseous products (H2O and CO2) - this is a physical change.
What reactions shows a physical change?
NaCI(s) ---------> NaCI(aq)
Is bananas turning black if you leave them in a warm cupboard for a week a chemical reaction and why?
Yes, it is a chemical reaction, because the colour of the banana has changed, which shows that a chemical reaction has taken place. Also, if the banana has gone black and turned bad, you can't change it back to it's original form, which proves that it is a chemical reaction and not a physical reaction. Remember - A chemical reaction has definitely taken place if : It's colour has changed A gas is given off There are energy changes Or, it can't be changed back to what it used to be! :) Hope this helps!!
Is energy alwways released during a chemical change?
No. Chemical changes can release heat (exothermic) or absorb heat (endothermic). The change in molecular structure determines whether energy is stored or released. Example of exothermic : * combustion of paper (oxidation, releasing carbon bond energy) * acetic acid (vinegar) accelerates the oxidation of steel wool (rusting) Example of endothermic : * Combination of citric acid and baking soda : temperature of the mixture shows a definite drop before rewarming by room temperature air. * In a commercial "Cold Pack", the chemicals mix and absorb heat. There are reactions which require an activation energy before proceeding to an exothermic change. This is demonstrated by the common matchstick.
Recipe that shows chemical and physical change?
By mixing wet and dry ingredients there will be a chemical reaction.For instance preparing pancakes, when mixing flour,sugar,salt and baking soda with grease,eggs, vinegar and milk these combined will form a solid pancake.
Which reactions shows a physical change?
Burning coal is a chemical reaction, a chemical change; but the solid reactant is transformed in gaseous products (H2O and CO2) - this is a physical change.
What reactions shows chemical producing a solid?
2AgNO3(aq) + CaBr2(aq) 2AgBr(s) + Ca(NO3)2(aq) estion…
What shows a chemical change producing a solid?
2AgNO3(aq) + CaBr2(aq) 2AgBr(s) + Ca(NO3)2(aq) estion…
What principle can be applied to all chemical reactions?
material reacts in the presence of another material
Changes in pressure affect which types of reactions?
Those gaseous reactions in which a balanced chemical equation shows that no of moles of products are not same as reactants.
What reactions shows a physical change?
NaCI(s) ---------> NaCI(aq)
What reaction shows a chemical changes producing a gas?
2AgNo3OH(I) + 3O2(g) -> 2CO2(g) + 4H2O(l) (from Apex)
Is this a chemical change or a physical change - when coal oil and natural gas are decomposed in landfills they produce methane gas?
it is chemical property. they use the word decomposition immaterially shows changein chemical composition.hence chemical change.
What is the relationship between a Chemical reaction and a chemical equation?
The chemical equation demonstrates the ratio of chemicals reacting and producing. Even though only minute amount of actual chemicals are reacting, the chemical equation shows which chemicals are doing what.
When iron is heated until it turns red the color change shows that a chemical change has occured?
False.
What shows the components of a chemical compound?
A chemical formula shows the components of a chemical compound.
When magnesium is burning in the presence of oxygen what are some evidence that a chemical change is occurring?
It shows the change of when the magnesium is burning in the presence of oxygen.
