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6th U3.4 Science

Unit 3 Lesson 4 Science Pure Substances and Mixtures

QuestionAnswer
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: PRO Teacher wmeeks