Chemistry

2. a substance that releases hydroxide ions (OH⁻) in solution.
5. a scale that measures the acidity or alkalinity of a solution.
6. a positively charged subatomic particle found in the nucleus of an atom.
8. Reaction, a reaction that absorbs energy, usually in the form of heat.
11. the substance(s) formed as a result of a chemical reaction.
13. Number, the total number of protons and neutrons in the nucleus of an atom.
14. Reaction, a process in which substances change to form new substances with different properties.
17. Reaction, a reaction that releases energy, usually in the form of heat.
19. of Mass, a principle stating that mass is neither created nor destroyed in a chemical reaction.
20. a subatomic particle with no charge, found in the nucleus of an atom.
23. a substance formed when two or more different types of atoms chemically bond together.
24. an element with properties of both metals and non-metals.
26. a substance that releases hydrogen ions (H⁺) in solution.
27. an element that lacks metallic properties and is often a poor conductor.
29. a combination of two or more substances that are not chemically bonded.

1. a substance that undergoes change in a chemical reaction.
3. the smallest unit of matter, consisting of protons, neutrons, and electrons.
4. two or more atoms bonded together, which can be the same or different types of atoms.
5. an insoluble solid formed from a reaction between two solutions.
7. Number, the number of protons in the nucleus of an atom, defining the element.
9. Bond, a chemical bond formed when atoms share electrons.
10. a negatively charged subatomic particle found orbiting the nucleus of an atom.
12. atoms of the same element with different numbers of neutrons.
15. Change, a change in a substance's form or state without altering its chemical composition.
16. Table, a chart that organizes all known elements by their properties and atomic numbers.
18. Bond, a chemical bond formed through the transfer of electrons from one atom to another.
21. an element that is typically shiny, malleable, and a good conductor of heat and electricity.
22. Change, a change that results in the formation of one or more new substances.
25. an atom or molecule that has gained or lost electrons, giving it a positive or negative charge.
28. a pure substance made up of only one type of atom.