If you mix two substances together, what evidence would tell you a reaction occurred?
Bubbling, color change, temperature change etc
100
What is Kinetic Energy?
The energy of motion
100
As heat increases what happens to the kinetic energy?
It increases as well
100
What is the definition of an element?
Building blocks of matter. Cannot be broken down further
200
CH4 + O2 ------> C02 + H20
Which are the products?
C02 + H20
200
A fast particle and slow particle collide
Which particle had more kinetic energy before the collision?
The fast particle
200
How is kinetic energy measured?
By taking the temperaute
200
What is the definition of a particle?
The smallest part of a substance that is still that substance
300
What is the definition of a chemical reaction?
When two or more substances combine and change to form a new substance(s)
300
What happens to a volume of air when it is heated
Expansion causes the volume to increase
300
A plastic bottle filled with warm air is submerged in cold water.
What direction does energy flow to cool the air inside the bottle?
From the air inside the bottle to the cool water
300
What holds atoms together in compound?
Chemical Bonds
400
What is the difference between dissolving and melting?
Melting - Going from solid to a liquid as temp increases
Dissolving - Interactions between particles cause a substance to break up and become part of a liquid
400
What is the difference between compression and contraction?
Compression - Particles are forced into a smaller space
Contraction - Particle get closer together as temperature/kinetic energy decrease
400
20ml of hot water at 45C and 20ml of cold water at 5C are mixed together.
What is the final temp?
25C
400
What is a compound?
A substance that is made up of two or more different elements
500
Complete this reaction
Ca(OH)2 + CO2 ----------> ?
500
What three things happen to particles in a substance when it is heated?
They move faster and bump into each other harder, they get farther apart and they collide more often
500
100g of hot water at 50C was mixed with cold water and the final temperature was 25C.
How much heat energy (calories) was lost by the hot water?
2500 Cal
500
How many elements and atoms are in the this substance
NaCHO3