Classifying Matter
physical properties
chemical properties
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100

Classify pure substances or mixtures based on a description.

Pure substance has a constant composition (constant melting/boiling point).

Mixtures are two or more substances combined physically.

100

Is milk a pure substance? If not, what is it?

It isn't, It contains various components (water, fat, protein, and sugars). Which will make it a mixture.

100

Malleability- What materials tend to be malleable?

Gold

100

What are the two methods of using physical properties to separate mixtures.

Filtration and evaporation

100

Which is more reactive, oxygen or nitrogen?

Oxygen

200

Whats the difference between elements and compounds?

Elements consist of one type of atom

Compounds consist of two or more different types of atoms combined together 

200

Identify homogeneous solutions and colloids. And an example for both. 

Homogenous solution is completely dissolved. Ex- saltwater

Homogeneous colloids are phases of smaller particles. Ex- milk

200

Hardness- How does the "scratch test" work? 

Scratch a surface harder and harder until a scratch forms. It shows how hard a surface is.

200

When can you use filtration to separate mixtures (heterogeneous or homogeneous)?

Heterogeneous

200

What are the 4 "clues" that a chemical change has taken place?

1. change in color 2. production of gas 3. formation of precipitate 4. changes in temperature

300

(True or False) Do compounds have different properties than the substances from which they're made?

True

300

Identify heterogenous mixtures as suspension. And give an example.   

Settles out apon standing. Ex- Flour in water

300

Melting and boiling points- What's the m.p. and b.p. for water? What state of matter will it be in at room temperature based on the m.p. and b.p.?

M.p.- 0 degrees C    B.p. 100 degrees C

The state of matter based on m.p. is LIQUID

The state of matter based on b.p. is Gas

300

Describe the process of distillation. How does it work?

It's the process of separating a liquid from a mixture.

It works by heating a liquid mixture to create vapor.

300

What's the difference between a chemical change and a physical change?

Chemical change: the composition of the matter CHANGES

Physical change: the composition of the matter STAYS THE SAME


400

Compounds aren't made of two or more elements joined in a fixed proportion.  

False- Compounds ARE made of two or more elements 

400

Viscosity- How fast do materials with a high viscosity flow? How fast do materials with a low viscosity flow.?

High viscosity- flows slow

Low viscosity- flows fast

400

Density- Describe the water displacement method. Find the density of an object just given its mass and volume.

Take a cylinder and fill it with water enough to over the object. Record the measurement. Then put the object inside the cylinder and remeasure it. Before object- after object.

Density = Mass divided by volume

400

Identify whether a physical change is reversable or irreversible. 

Mostly reversable.

irreversible- cutting wood

reversible- melting ice

500

(True or False) The composition, and maybe properties, of mixtures can vary.

True

500

Conductivity- What would be a good conductor? What would make a bad conductor?

Good conductor- metal spoon

Bad conductor- Wood spoon

500

What are the 2 reasons why physical properties are useful?

1. Helps identify a material

2. Helps choose a material for a specific purpose

500

Give 2 examples of chemical properties- when can chemical properties be observed?

Flammability and reactivity

When the substance in a sample of matter is changing into different substances

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