Yes, in chemical reactions the fundamental structure of the molecules (i.e., the arrangement of the atoms) changes. This differs from a physical reaction, in that in a physical reaction, only superficial traits of the substance change. A good rule of thumb for determining whether something is a physical or chemical reaction is that physical reactions are easily reversible (e.g., freezing/melting water), while a chemical reaction is not really reversible (e.g., cooking/uncooking a steak).
Yes, chemical changes cause atoms to be rearranged by adding or removing elements from compounds, or both adding and removing.
*Another type of atomic rearrangement, called allotropes, are not the result of chemical changes, but of structural changes within an element's molecules (e.g. carbon as graphite or as diamond).
No, matter cannot be created or destroyed.
Yes and No. The atoms themselves do not rearrange but during a chemical change different atoms come together to make new COMPOUNDS by exchanging or sharing electrons.
Chemical bonds are made and broken by chemical reactions. After chemical bonds have been broken, then energy is released, and if a chemical bond is made, then energy is absorbed.
Physical changes are like cutting paper. The mass does not change. Chemical changes do not change total mass either. If you put a candle in a sealed container so that you may measure the total mass of the candle and the air before burning, then light the candle electrically but keep everything sealed, the total mass after burning will still be the same. But if you measure only the candle, then its mass has changed. So the mass of one single 'ingredient' will change during a chemical change.
Chemical change: the composition of the initial reactants is changed. Ex.: thermal decomposition of calcium carbonate. Physical change: the composition is not changed during this transformation. Ex.: boiling of water.
The independent variable changes during an experiment.
condensation
atoms, are rearranged during a chemical change.
False.
If it is a true or false question it is false
If it is a true or false question it is false
In chemical reactions, the number of atoms stays the same, yet they may recombine into different types of molecules. That is why some chemical reactions use two compounds to create a different coumpound.
Atoms of different elements unite during chemical changes to produce at least one chemical compound.
a chemical reaction
Atoms are rearranged, heat may be given off, changes in color and odor might occur, or a gas or precipice may be formed. The composition is changed, and the above are signs of a chemical change.
An atom may change by rearranging the number of neutrons in the nucleus. It will still be the same chemical element, for the number of electrons (and protons) will still be the same. But the number of neutrons, and hence the mass, will change. Usually by radioactive behaviour.
During a chemical change, matter is rearranged to produce new forms of matter. This is a result of either the sharing or transfer of electrons between different atoms. Observable evidence of a chemical change can be, but is not limited to, the formation of bubbles, a change in color or temperature, and the presence of a smell.
Matter is simply rearranged, atoms are exchanged to create new molecules.
Reactants form product(s) during a chemical reactions, generally by oxidation, reduction, hydrolysis, or chemical bonding.