Properties of Mixtures and Substances

What are the two main types of mixtures?

• Homogeneous and heterogeneous mixtures.

• Solid and liquid mixtures.

• Natural and artificial mixtures.

• Simple and complex mixtures.

Define heterogeneous mixture.

• A mixture that consists of visibly different substances or phases, such as salad.

• A mixture that has a uniform composition throughout.

• A mixture that can be separated by physical means into its components.

• A mixture that contains only one phase or substance.

Give an example of a heterogeneous mixture.

• Granite

• Saltwater

• Vinegar

• Air

What are noble gases?

• A group of elements in Group 18 of the periodic table that are known for their lack of reactivity.

• A category of metals that are highly reactive with water.

• A set of elements that are all gases at room temperature and highly flammable.

• A group of elements that are found in Group 1 of the periodic table.

What is an example of a pure substance?

• Carbon dioxide.

• Salt water.

• Air.

• Wood.

What is a pure substance?

• A material made of only one type of particle, having a uniform and definite composition.

• A mixture of different substances that can be separated by physical means.

• A substance that can exist in multiple states, such as solid, liquid, and gas.

• A compound that contains two or more elements chemically bonded together.

What are the properties of alkali metals?

• They are highly reactive, especially with water, and have low melting points.

• They are non-reactive and have high melting points.

• They are good conductors of electricity and have high densities.

• They are found in nature as noble gases.

What is a mixture?

• A combination of two or more substances that are not chemically bonded.

• A single substance that cannot be separated into its components.

• A chemical reaction between two or more substances.

• A solution where one substance is dissolved in another.

What is the significance of the periodic table in understanding elements?

• It organizes elements based on their properties and helps predict their behavior.

• It lists all known elements in alphabetical order.

• It provides a historical timeline of element discovery.

• It categorizes elements by their color and size.

Define homogeneous mixture.

• A mixture that has a uniform composition throughout, such as salt water.

• A mixture that contains different substances that are not evenly distributed, like salad dressing.

• A mixture that can be separated into its components by physical means, like sand and iron filings.

• A mixture that has varying properties in different parts, like a fruit salad.