Biology

Biology, 10.07.2019 15:00, garrettengle03

What occurs in a chemical reaction? chemical changes are reversed. substances are melted. atoms are rearranged. physical changes are reversed.

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Chemistry, 29.06.2019 07:30, tugordochulo1

Achemical reaction involves the rearrangement of atoms to form new molecules. during a chemical reaction, however, atoms are neither created nor destroyed. which of the following is true about the atoms involved in a chemical reaction? a. the total mass of the atoms involved in a chemical reaction always changes as the atoms are rearranged into new molecules. b. the total mass of the atoms involved in a chemical reaction will stay the same no matter how the atoms are rearranged. c. the total mass of the atoms involved in a chemical reaction will increase if a new compound is formed during the reaction. d. the total mass of the atoms involved in a chemical reaction will decrease if two molecules combine to form one single compound.

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Chemistry, 05.07.2019 18:00, jacobd578

Which statement describes one of the main differences between a physical and a chemical change? a chemical change involves reactants and products, whereas a physical change involves only reactants. a physical change is a change of state, whereas in a chemical change the substance keeps the same form. a physical change brings about a different form of the same substance, whereas a chemical change forms a different substance. a chemical change caused by adding or removing heat energy can usually be reversed, whereas a physical change can generally not be reversed.

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Chemistry, 15.07.2019 05:40, kl8774

When a covalent or an ionic bond is formed a chemical change has occurred. which of these is not associated with a chemical change? a. the atoms of the substances produced have been rearranged. b. the substances produced are identical to the substances that reacted except that they're isomers. c. the total mass of the reacting substances is the same as the total mass of the substances produced by the reaction. d. the chemical properties of the substances produced by the reaction are different from those of the reacting substances.

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Chemistry, 20.07.2019 01:00, 4300252063

This flask originally held some copper wire and a clear solution of nitric acid. the two substances reacted and produced a brown gas and a blue solution. this reaction cannot be reversed. this reaction is a reaction. a) nuclear b) chemical c) physical d) none of these changes are occurring

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