What is in a chemical reaction, matter is neither created nor destroyed?
100
Balanced or unbalanced:
H20 + CO2 ----> H + HCO3
What is balanced?
200
This is the number of bonds a carbon can form with itself or with other elements.
What is four bonds?
200
Most polymers are made of this element.
What is carbon?
200
Baking Bread is this kind of reaction. (chemical or physical)
What is chemical reaction?
200
If you react hydrogen and oxgen, you make water. If 10 g of water is made from 4 g of oxygen. How much hydrogen is needed?
What is 6 g?
200
This is the coefficient in front of Cu.
Cu2S + O2 ----> ____ Cu + SO2
What is 2?
300
This is the number of valence electrons that carbon has.
What is 4 valence electrons?
300
Hydrocarbons are polymers made of these 2 elements.
What is hydrogen and carbon?
300
When aluminum meets copper chloride (green liquid), it fizzes and bubbles and gets really hot. Also, a red-brown substance is made and the liquid that remains is clear. Name all of the indicators that a chemical reaction occurred.
What is forming a new substance (red-brown solid), temperature change (heats up), formation of a gas (fizzing) and a color change (teal becomes clear)?
300
To make 20 g of iron sulfide, you need 6 g of iron and how much of sulfur?
What is 14 g?
300
____ LiBr ---> ____ Li + Br2
These are the coefficients needed to balance the equation above.
What is 2 LiBr and 2 Li?
400
Graphite is a pure form of carbon. Name two other pure forms of carbon.
What is diamond, fullerenes and nanotubes?
400
Name the 4 major organic polymers found in the human body.
What is carbohydrates, proteins, lipids (fats) and nucleic acids?
400
This is a precipitate.
What is when 2 liquids form a solid?
400
How are the reactants related to the products in a chemical reaction?
What is they must equal?
400
____ Na + O2 ---> ____ Na2O
Theseare the coeffiencents in front of each molecule to make the reaction balanced.
What is 4 Na and 2 Na2O?
500
These are the 3 ways carbon atoms can be arranged.
What is straight chains, branched chains and rings?
500
Name 2 examples of natural polymers and 2 examples of synthetic polymers.
What is hair, silk, spider silk, wood, orange, fish fins and synthetic polymers such as rayon, polyester, PVC, plastics...
500
This is the only way you are 100% sure that a chemical reaction took place.
What is the forming of new products?
500
How is the Law of Conservation of Matter related to balancing chemical equations?
What is It is the reason why we must balance chemical equations?
500
____ KI + ___Br ---> ____KBr + I2
These are the coefficients needed to balance the equations.