Chemistry quiz 1 lesson 5.1 what is Chemistry
products
(finished) substance present after change takes place
reactants
(ingredients) Substance present before change takes place
What are the two types of chemicals
Bad and Good chemicals
How much around us is composed of chemicals?
Everything
How can you find evidence of chemical changes?
Gas formation, precipitation, release or absorb energy
What do chemical reactions produce?
New chemicals
what 2 ways can matter change in
Physical and Chemical
other states of matter
Plasma, Bose-Einstein condensate and neutron star
What are examples of chemicals made in the US
Sulferic Acid, Ethine, Propylene, and Ammonia
a state of matter is what
a physical form of matter
in a chemical reaction what is rearranged?
atoms(not destroyed or created)
gas formation evidence
bubbles form when chemicals mix new gas is formed
how do you tell if it is a chemical change?
can you unbake a cake
release or absorption of energy evidence
change in temperature 2 chemicals mix and temperature changes
What are examples of bad chemicals
chemicals that cause pollution and cancer
what are properties of physical states in a solid?
definite volume and definite shape strong particle attractions results in rigid structure slight vibrations
properties of physical states in liquids
definite volume indefinite shape particles can slip past one another a liquid can flow and take shape of its container
precipitation evidence
formation of a solid 2 liquids mix and solid forms
composition
how things are made up
properties of physical states in gases
indefinite volume indefinite shape weak particles attraction result in particles moving independently at high speeds
how do you tell if it is a physical change?
is the water still water is the plastic still plastic
what may change in a physical change?
location, distribution, and speed of the particles in a substance
in a chemical change
new substances are formed
can matter be created in a chemical change?
no
in chemical change what happens to matter?
not created but changed
What is all matter made up of?
particles
All changes of state are
physical changes
what is the importance of Sulferic Acid
production of fertilizer and petroleum refining
Ammonia importance
production of fertilizer and refrigeration
Propylene importance
production of plastics
Ethine importance
production of plastics and ripening of fruits
what is a chemical substance made up of?
same number and types of atoms connected together
what are three most common states of matter?
solid, liquid, gas
examples of reversible process?
steam condensed back into water reshape plastic
Chemistry
studies properties of matter and changes that matter can undergo
Chemical
substance that has a definite composition
what does not change in a physical change?
the identity of a substance
what happens in a chemical change
the identity of a substance changes
what is an example of a chemical way matter can change?
water into hydrogen peroxide
What is an example of a physical way matter can change?
water into ice
what are examples of good chemicals
water, cotton, wool, and polyester
When do chemical reactions occur?
when chemical composition of substances changes
