Chemistry

4. - A mixture of two or more metals.
5. - A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound.
6. - A substance that dissolves another to form a solution.
7. - A substance that increases the concentration of hydroxide ions (OH⁻) in a solution.
9. - A subatomic particle with a negative charge that orbits the nucleus of an atom.
11. - The loss of electrons by a molecule, atom, or ion.
12. - An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
13. - A substance that speeds up a chemical reaction without being consumed.
15. - The combining power of an element, especially in terms of the number of hydrogen atoms it can bond with.
17. - The gain of electrons by a molecule, atom, or ion.
19. - A positively charged subatomic particle found in the nucleus of an atom.
20. - A substance that cannot be broken down into simpler substances by chemical means.
21. - A substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions.
23. - A type of bond formed when one atom donates an electron to another.
25. - A substance formed from two or more elements chemically bonded together.

1. - A chemical process by which electrical current is passed through a substance to effect a chemical change.
2. - A process in which one or more substances are changed into one or more new substances.
3. - The arrangement of elements in order of increasing atomic number, showing recurring properties.
4. - The basic unit of a chemical element.
7. - The force holding two atoms together in a molecule.
8. - A compound composed only of hydrogen and carbon atoms.
9. - A biological catalyst that speeds up chemical reactions in living organisms.
10. - A type of bond where atoms share electrons.
14. - The substance dissolved in a solvent to form a solution.
16. - A subatomic particle with no electric charge, located in the nucleus of an atom.
18. - Atoms of the same element with different numbers of neutrons.
19. - A scale used to specify the acidity or basicity of an aqueous solution.
20. - A state in which opposing forces or reactions are balanced.
22. - A substance that increases the concentration of hydrogen ions (H⁺) in a solution.
24. - An element or substance that does not exhibit metallic properties.