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What is a characteristic of a synthesis reaction?
A synthesis reaction occurs when two or more simple substances combine to form more complex substances. A + B -> AB Reversing a synthesis reaction gives decomposition reaction. AB ->A + B
Why fructose gives positive tollen reagent test?
Only aldehydes give a positive Tollens test. However, under the strongly basic conditions of the test, alpha-hydroxy ketones can isomerize to aldehydes, so they will also give a positive Tollens test. Fructose is an alpha-hydroxy ketone.
When aluminum metal is added to hydrobromic acid what kind of change occurs?
it gives us a new substance that is aluminum bromide therefore it is a chemical change.
What reaction occurs when chemical bonds between atoms are broken?
Energy is absorbed, hence it is an endothermic process. The two atoms shared energy. Breaking them apart means they need energy replaced, which is taken from atmospheric heat.
What substances give a positive tollens test?
When adding the aldehyde or ketone to Tollens' reagent, the test tube is put in a warm water bath. If the reactant under test is an aldehyde, Tollens' test results in a silver mirror. If the reactant is a ketone, it will not react because a ketone cannot be oxidized easily. A ketone has no available hydrogen atom on the carbonyl carbon that can be oxidized - unlike an aldehyde, which has this hydrogen atom.
Is fructose gives positive test with tollens reagent?
no negative
What is a characteristic of a synthesis reaction?
A synthesis reaction occurs when two or more simple substances combine to form more complex substances. A + B -> AB Reversing a synthesis reaction gives decomposition reaction. AB ->A + B
What is the chemistry behind the non-enzymatic browning reaction that occurs when making fudge from sugar and cream?
A condensation reaction occurs between the NH2 of the amino acid and the CHO if the reducing sugar. Lysine gives it a very brown colour and cysteine gives it a not-so-brown colour.
When aluminum metal is added to hydrobromic acid what kind of change occurs?
it gives us a new substance that is aluminum bromide therefore it is a chemical change.
Why fructose gives positive tollen reagent test?
Only aldehydes give a positive Tollens test. However, under the strongly basic conditions of the test, alpha-hydroxy ketones can isomerize to aldehydes, so they will also give a positive Tollens test. Fructose is an alpha-hydroxy ketone.
What reaction occurs when chemical bonds between atoms are broken?
Energy is absorbed, hence it is an endothermic process. The two atoms shared energy. Breaking them apart means they need energy replaced, which is taken from atmospheric heat.
What phrase best describes a exothermic chemical reaction?
A chemical change that gives off heat. Burning paper would be an example.
What is a reaction that gives out a lot of heat?
exothermic reaction
What is solvent for benzil to develop TLC and Rf?
50:50 ethyl acetate and petroleum ether gives an rf value of about 0.6.You are supposed to dissolve the compound in any volatile solvent like methylene chloride or acetone.
What substances give a positive tollens test?
When adding the aldehyde or ketone to Tollens' reagent, the test tube is put in a warm water bath. If the reactant under test is an aldehyde, Tollens' test results in a silver mirror. If the reactant is a ketone, it will not react because a ketone cannot be oxidized easily. A ketone has no available hydrogen atom on the carbonyl carbon that can be oxidized - unlike an aldehyde, which has this hydrogen atom.
What term is used for the type of chemical reaction that gives out heat energy?
Exothermic reaction gives free heat (energy).
What term is used 4 the type of chemical reaction that gives out heat energy?
Exothermic reaction gives free heat (energy).
