Show:
Types of Matter
Density
Chemical/Physical Properties
Chemical/Physical Changes
Definitions
100
What is an atom and how does it fit into the scheme of matter as far as complexity?
An atom is the smallest building blocks of elements and matter. It is the simplest unit of matter.
100
How is density defined?
It is the ratio of mass to volume. You take the mass in g and divide by the volume in cubic centimeters. It is a measure of how tightly packed the atoms and molecules of the substance are.
100
How is a physical property defined? Your definition must be complete.
It is a property which can be observed or measured without changing the substance.
100
What is a physical change?
It is a change from one form of matter to another without changing the identity of the substance. No chemical change occurs.
100
What is matter?
Anything that has mass and takes up space.
200
What is an element and how does it fit into the scheme of matter as far as complexity?
An element is a substance made of only one kind of atom. It is a little more complex than an atom because it is made of one or more atoms that are joined together.
200
What is the density of a substance that has a volume of 3 cubic centimeters and a mass of 18 g?
6 g/ cubic centimeter
200
What is the definition of a chemical property?
It is a property that describes a substance's abiltiy to participate in chemical reactions
200
A substance is boiling; what kind of change is occurring? Explain your answer.
A physical change is occurring because the substance is only changing from a liquid to a gas and the substance is not changing into another substance.
200
What is a molecule?
A substance that is made of two or more atoms that are chemically combined.
300
What is a compound and how does it fit into the scheme of matter as far as complexity?
A compound is a substance made of two of more kinds of atoms chemically combined together and it is more complex than an element because it is made of two or more elements joined together.
300
What type of property is density? Explain your answer.
Density is a physical property because it is measured and calculated without changing the identity of the substance.
300
What kind of property is freezing point? Explain your answer.
It is a physical property because it can be measured without changing the substance.
300
Name at least 5 signs of a chemical change.
1. color change 2. temperature change 3. light is given off 4. change in odor 5. new substance(s) are formed 6. bubbles of gas are formed 7. etc.
300
Can all molecules be considered to be compounds? Explain your answer.
No they cannot because a molecules atoms can either be all alike or they can be different. A compounds atoms cannot all be alike.
400
Can all compounds be considered to be molecules? Explain your answer.
All compounds can be considered to be a molecule because a molecule is any two or more atoms chemically combined. This includes any two or more kinds of atoms chemically combined, which is the definition of a compound.
400
Which substance will sink when placed in liquid water, a substance with a density of 0.7 g/cubic centimeter or a substance with a density 1.7 g/ cubic centimeter? Explain your answer.
The one with the density of 1.7 g/cubic centimeter because it has a density that is greater than 1.0 g/cubic centimeter
400
What kind of property is flammability? Explain your answer.
Flammability is chemical property because it can only be observed during a chemical reaction opportunity.
400
A mixture has been made, tell what kind of change has occurred and explain your answer.
It is a physical change because the substances do not chemically combine and no new substances are formed.
400
How are a physical property and a chemical property alike?
They both can be used to identify a substance.
500
Compare and contrast a mixture and a pure substance.
A mixture is any combination of elements and compounds that are not chemically combined. A pure substance is either a single element or a single compound. Both types of substances will be composed of atoms or molecules; however, the pure substance will only have a single kind and the mixture will not.
500
When a chemical change occurs is density effected? Explain your answer.
Yes, density is effected because the physical properties of a substance are changed because the substance is given a completely new identity.
500
Name at least two chemical properties of baking soda.
It is not flammable because it is used to put out fires and it is definitely reactive to vinegar because this has been seen in class.
500
How are a chemical change and a physical change alike?
They both involve a change in appearance and they both involve a change in energy.
500
Why are changes of state considered to be physical changes?
During change of state a substance is changing from one state of matter to another and the substance does not chemically change. It only changes in appearance or form.