8th Grade Matter Review GMAS

Across

2. Property A characteristic that describes how a substance interacts with other substances to form new substances (e.g., flammability, reactivity).
5. Anything that has mass and occupies space.
10. A group of two or more atoms bonded together, representing the smallest unit of a chemical compound.
12. A row in the periodic table, where elements have the same number of electron shells.
15. A type of mixture where one substance is dissolved evenly in another (e.g., salt in water).
16. Change A change in which a substance transforms into a different substance with a new chemical composition, such as burning, rusting, or digestion.
19. Theory of Matter The theory that all matter is made up of particles that are in constant motion; the speed of the particles affects the state of matter.
20. Table A chart that organizes all known elements by their atomic number, electron configuration, and recurring chemical properties.
21. A state of matter in which the particles are far apart and move freely, having neither a fixed shape nor a fixed volume.
22. The center of an atom, made up of protons and neutrons.
26. The basic unit of matter, consisting of protons, neutrons, and electrons.
27. The mass of an object divided by its volume; a measure of how tightly packed the particles are in a substance.
30. The process in which a liquid changes to a gas throughout the liquid, not just at the surface.
31. Property A characteristic of matter that can be observed or measured without changing the substance's chemical identity (e.g., color, shape, size, texture).
32. A positively charged particle found in the nucleus of an atom.
34. A state of matter in which the particles are tightly packed and have a fixed shape and volume.
35. The process in which a solid changes to a liquid as it gains heat.
36. of Conservation of Matter Matter cannot be created or destroyed in a chemical reaction; it only changes form.

Down

1. A neutral particle found in the nucleus of an atom.
3. A substance made from two or more different types of atoms bonded together in a fixed ratio.
4. The process in which a liquid changes to a gas at the surface of the liquid.
6. A pure substance made of only one type of atom, cannot be broken down into simpler substances by chemical means.
7. Mass The average mass of an element's atoms, based on the number of protons and neutrons.
8. Change The transition of matter from one state to another, such as melting, freezing, condensation, or vaporization.
9. The process in which a liquid changes to a solid as it loses heat.
11. A negatively charged particle that orbits the nucleus of an atom.
13. The amount of space an object or substance occupies, measured in liters (L), milliliters (mL), or cubic centimeters (cm³).
14. Number The number of protons in the nucleus of an atom, which defines the element.
17. The process in which a gas changes to a liquid, often when it cools down.
18. Atoms of the same element that have the same number of protons but a different number of neutrons, resulting in different atomic masses.
20. A state of matter where atoms are ionized, consisting of free electrons and ions (commonly found in stars and lightning).
23. The process in which a solid changes directly into a gas without passing through the liquid phase (e.g., dry ice).
24. Electrons Electrons in the outermost energy level of an atom, important for chemical bonding.
25. A state of matter in which the particles are close together but can move past one another, having a definite volume but no fixed shape.
28. A combination of two or more substances that are not chemically bonded and can be separated by physical means.
29. Change A change in a substance that does not alter its chemical composition, such as changes in state (solid, liquid, gas), shape, or size.
33. The amount of matter in an object or substance, usually measured in grams or kilograms.