Chemistry quiz 1 lesson 5.1 what is Chemistry

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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


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