________ changes all the time, undergoing either a ____________ or _________ change.
What is matter, physical, chemical
100
When a _________ change occurs, atoms rearrange themselves to form different kinds of ________.
What is chemical, matter
100
___________ are chemicals used to kill bacteria.
What is antibiotics
100
Many _______ materials are useful, such as plastics and cement.
What is synthetic
100
Advances in ________ have provided many benefits to modern transportation.
What is chemistry
200
what is an example of a physical change?
What is raindrops freezing into sleet.
200
A change in _______ or the formation of a gas or solid can be evidence of a __________ change.
What is color, chemical
200
Other discoveries in chemistry both prevented human __________ and increased food production.
What is diseases.
200
Many materials used daily come from nature, but other were __________ by scientist.
What is created
200
Chemist developed and improved ________ rubber that is used for many products
What is artificial
300
If you crumple a piece of paper into a ball, is the change physical or chemical?
What is phyisical
300
During some __________ changes, bonds between atoms or molecules break or new bonds form, and materials may give off or take in _______.
What is chemical, energy
300
Who discovered penicillin?
What is Alexander Fleming
300
When did scientists begin to try to create a fiber to replace silk?
What is 1800's
300
How did scientist working with rubber and petroleum help our modern transportation system?
What is they made it durable at a wide range of temperatures.
400
what is the difference between a chemical change and a physical change?
What is a chemical change results when one kind of matter changes into a completely different kind of matter.
Physical change the identity of the matter does not change.
400
List three types of evidence of chemical change.
What is color change, formation of a gas, formation of a solid, change in energy, such as heat or light
400
What are antibiotic and how have they improved health?
What is medicines that kill bacteria. It has made once life-threatening diseased curable in many cases.
400
What is polymer?
What is a large molecule made of many identical smaller units connected together
500
What form is ice?
What is solid
500
Compare the second and third pictures of the copper tree experiment. Aside from the forming of solid crystals, what other evidence of chemical change in the liquid do you see?
What is The solution has changed color from clear to blue.
500
Why were chemists important in turning penicillin into a widely used lifesaving medicine?
What is Chemists separated the antibiotic from the mold and found a way to make it.
500
What are three common materials that were developed by scientists?