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6th U3.4 Science
Unit 3 Lesson 4 Science Pure Substances and Mixtures
| Question | Answer |
|---|---|
| The smallest unit of an element that maintains the properties of that element. | Atoms |
| The three major classes of matter are __, ___ and ___. | Elements, compounds and mixtures |
| Atoms are the basic building __ for all three types of matter. | Blocks |
| An ___ is made up of one or more of the same kind of atom chemically combined. | Element |
| A ___ is made up of different kinds of atoms chemically combine. These have different properties from the elements that make them up. | Compound |
| A __ contains a variety of elements and compounds that are not chemically combined with each other. | Mixture |
| Elements and compounds are ___ substances, or a substance that has definite physical and chemical properties such as appearance, melting point, and reactivity. | Pure substances |
| Compounds, such as water are pure substances, two different kinds of atoms make up each chemically combined particle or ___. | Molecule |
| Water always freezes at ___ | 0 degrees C |
| Water always boils at __. | 100 degrees C |
| What happens when a pure substance undergoes a chemical change? | It is not longer the same substance. It changes into another substance or substances. |
| The three classifications of elements are ___. | Metals, nonmetals and metalloids. |
| Most ___ are shiny, conduct heat and electricity well, and can be shaped into thin sheets or wires. | Metals |
| Most ___ are not shiny, they do not conduct heat or electricity well. | Nonmetals |
| ___ have some properties of both metals and nonmetals. | Mettalloids |
| Elements are arranged on the ___, which is a useful tool that can help you identify elements that have similar properties. | Periodic Table |
| Compounds can be classified into a few basic categories by their properties such as by their __. Compounds can be classified as acidic, basic or neutral. | pH |
| Vinegar contains acetic acid, the pH of acids are below ___. | 7 |
| Baking soda is an example of a ___compound, and have a pH greater than ___. This type of compounds have a slippery feel and a bitter taste. | basic, 7 |
| Pure water and table salt are ___ compounds, and have a pH value of ___. | Neutral 7 |
| In chemistry, the word ___ refers to compounds that contain ___ and ___. | Carbon and hydrogen |
| The compounds that make up plastic are ___ because they contain carbon. | Organic |
| ___ compounds do not contain carbon and hydrogen. | Inorganic |
| Organic compounds that are made by living things are called ___. | Biochemicals |
| Biochemicals are divided into four categories: | carbohydrates, lipids, proteins and nucleic acids. |
| ___ are used as a source of energy and include sugars, starches and fiber. | Carbohydrates |
| ___ are biochemicals that store excess energy int he body and make up cell membranes. This type of biochemicals include fats, oils, and waxes. | Lipids |
| ___ are one of the most abundant types of compounds in your body. They regulate chemical activities of the body and build and repair body structures. | Proteins |
| ___ such as DNA and RNA contain genetic information and help the body build proteins. | Nucleic acids |
| A ___ is a combination of two or more substances that are combined physically but not chemically. | Mixture |
| If two or more materials are put together, they form a ___. Mixing lettuce, tomatoes, and onions together to make a salad is an example of a ___. | Mixture |
| Mixtures are not ___ substances. | Pure |
| Mixtures do not have definite ___. | Properties |
| Mixtures can be ___by physical changes. | Separated |
| One way to separate salt from water is to heat the mixture until the water ___. | Evaporates. |
| A ___ can separate a mixture of aluminum nails and iron nails. | Magnet |
| Mixtures can be classified into two categories. A ___ mixture is one that does not have a uniform composition. Such as a bucket full of soil, dirt, leaves, and rocks. | Heterogeneous |
| Mixtures can be classified into two categories. A ___ mixture is one where the substances are evenly spread throughout. Such as sugar and water. | Homogeneous |
| ___ are heterogeneous mixtures in which the particles of a material are spread throughout a liquid or gas, but are too large to stay mixed without being stirred or shaken. | Suspensions |
| In a ___, one substance is dissolved in another substance. Tea is an example of this type of homogeneous. | Solutions |
| ___ particles are small and do not settle out quickly. They look homogeneous, but we consider them to be heterogeneous. Milk and gelatin are examples of this type of mixture. | Colloids |
Created by:
wmeeks
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