Explanation:
Atoms are the smallest unit of matter that can't be broken down chemically. Molecules are groups of two or more atoms that are chemically bonded. Ions are atoms or molecules that have gained or lost one or more of their valence electrons and therefore have a net positive or negative charge.
I believe the correct answer from the choices listed above is option D. Catalysts lower the activation energy of a chemical reaction. It <span>is a substance which speeds up a reaction, but is chemically unchanged at the end of the reaction. It provides another pathway for the reaction to occur.</span>
Because each element has an exactly defined line emission spectrum, scientists are able to identify them by the color of flame they produce.
Explanation:
8935200 mins plzzzźzzz mark it brainest
Answer:
it is equal to 1000 gram calories
