Natural and Synthetic
Are diamonds natural, synthetic or both?
Both
How many pieces of evidence do you need to say a chemical change has happened?
at least 2
If four carbon atoms combine with oxygen to form carbon dioxide molecules, how many carbon atoms will be found in the product?
4
What is the boiling point of water in Celsius?
100*C
5
OIL
Students mix vinegar and baking soda. They observe bubbles and fizzing, the baking soda dissolving and the vinegar turning cloudy. They infer that a chemical change has occurred. Which data support this inference?
Bubbles/ Fizzing
Finish this statement: The law of conservation of matter/mass states that matter cannot...
be created or destroyed, only transformed
What is the vocabulary word meaning: the ability to move heat or electricity?
Conductivity
Silk comes from silk worms, this would make it what kind of material?
Natural
The name for the repeating part in a polymer.
Monomer
What is the KEY difference between when a physical and chemical change occurs?
Where are the reactants in a chemical equation?
They are what is in front of the arrow
The vocabulary term meaning the ability to react or create new substances.
Reactivity
You do a chemical reaction and your test tube feels warm afterwards. What kind of reaction is this?
Exothermic reaction
Cellulose is what kind of polymer?
Natural
A balloon is placed in a freezer overnight. The balloon changed color, lost volume and was emitting a new gas. Which is the physical property?
Volume
How many TOTAL atoms are in this molecule: Pb(NO3)2
9
5 g/cm3
Why does burning steel wool seem to "gain" mass?
Oxidation of iron (creating iron oxide)
Define synthetic material
A material that is man made
In space there would be no sound because there is no air. If a steel (iron) bolt fell off of an orbiting satellite and remained in orbit, would it ever rust? WHY?
No because there is no oxygen!
6CO2 + 6H2O ---> C6H12O6 + 6O2
Determine how many of EACH atom there are on the PRODUCTS side of this equation.
C- 6
H- 12
O- 18
Gold is yellow, has a metallic shine, and has a density of 19.3 g/cm3. It is also a great conductor of electricity, can be flattened into paper like sheets and is biologically inert. Which 2 of these properties make it valuable for use in electronics?
It conducts electricity
It can be flattened into thin sheets
What are the 6 indicators of a chemical change?
Bubbles (gas), color change, change in temperature, production of a precipitate, light or sound is produced, change in odor