Matter Mixed Practice
| # | Answer |
|---|---|
| 1 | Matter is anything that has mass and takes up space. |
| 2 | Solid, liquid, and gas. |
| 3 | The nucleus. |
| 4 | Protons and neutrons. |
| 5 | An electron. |
| 6 | An element is a pure substance made of only one kind of atom. |
| 7 | A molecule is a group of two or more atoms held together by chemical bonds. |
| 8 | A molecule. |
| 9 | An atom is one particle of matter, while an element is a substance made of only one type of atom. |
| 10 | A solid has a fixed shape; a liquid has a fixed volume but takes the shape of its container. |
| 11 | Volume. |
| 12 | Mass. |
| 13 | Density is the amount of mass in a given volume. |
| 14 | Objects float or sink depending on whether their density is less than or greater than the density of water. |
| 15 | They move closer together and occupy less space. |
| 16 | Sublimation. |
| 17 | Condensation. |
| 18 | Evaporation or vaporization. |
| 19 | Freezing. |
| 20 | Melting. |
| 21 | It increases particle motion when added and decreases particle motion when removed. |
| 22 | Because their particles move freely and are far apart. |
| 23 | A physical property can be observed without changing the substance; for example, color, density, or melting point. |
| 24 | A chemical property describes a substance’s ability to change into a new substance; for example, flammability or reactivity with oxygen. |
| 25 | A physical change changes form or state without making a new substance; a chemical change produces one or more new substances. |
| 26 | It is usually considered a physical change because the sugar can be recovered and no new substance is formed. |
| 27 | A compound is a substance made of two or more different elements chemically combined in fixed proportions. |
| 28 | A mixture combines substances physically and can be separated by physical means; a compound is chemically bonded and requires chemical changes to separate. |
| 29 | A pure substance has one kind of particle, while a mixture contains two or more substances physically combined. |
| 30 | The atomic number is the number of protons in the nucleus of an atom. |
| 31 | The total number of protons and neutrons in the nucleus. |
| 32 | An isotope is an atom of the same element with a different number of neutrons. |
| 33 | Electrons, especially valence electrons, help determine how atoms bond and react. |
| 34 | Valence electrons are the electrons in the outermost energy level of an atom. |
| 35 | Atoms form bonds to become more stable, often by filling their outer electron shells. |
| 36 | An ionic bond forms when electrons are transferred from one atom to another, creating oppositely charged ions that attract each other. |
| 37 | A covalent bond forms when atoms share electrons. |
| 38 | Water helps transport substances, regulate temperature, and support chemical reactions in cells. |
| 39 | Because its electrons are shared unequally, giving it partial positive and negative ends. |
| 40 | Polarity allows water to dissolve many substances and interact well with other polar molecules and ions. |
| 41 | pH measures how acidic or basic a solution is. |
| 42 | About 7. |
| 43 | Carbon can form four strong covalent bonds, making it the backbone of many biological molecules. |
| 44 | Carbohydrates, lipids, proteins, and nucleic acids. |
| 45 | They provide quick energy and structural support in some organisms. |
| 46 | They store long-term energy, form cell membranes, and help with insulation. |
| 47 | Proteins act as enzymes, provide structure, transport substances, and support many cell functions. |
| 48 | They store and transmit genetic information. |
| 49 | Matter is conserved and recycled through processes such as the water cycle, carbon cycle, and nutrient cycles. |
| 50 | It means matter is not created or destroyed in biological processes, so atoms are rearranged and recycled in organisms and ecosystems. |