Chemical Reactions
What are two signs of a chemical reaction?
Many correct answers:
Color change, temp change, pH change
Bubbles/gas, fire/smoke
Is this equation balanced?
H2 + O2 --> H2O
no
Draw the structure of water including the valence electrons and positive/negative ends
ms ray will judge
Is wind matter or energy?
energy
Which of these is an atom?
a) NH3
b) N
c) N2
b) N
What are the reactants of this chemical equation?
N2 + 3 H2 --> 2 NH3
N2 and H2
Balance the equation:
HBr + Cl2 --> HCl + Br2
2 HBr + Cl2 --> 2 HCl + Br2
Why is water so good at dissolving things?
because it's polar!
matter
What is the name of the water property that allows a paperclip to sit on the surface of water?
surface tension
What type of reaction is this?
AgNO3 + Cu --> Ag + CuNO3
Single replacement
How many molecules of H2 will react with 1 molecule of N2?
N2 + 3H2 --> 2NH3
3 Molecules of H2
What things make dissolved oxygen higher?
cold temperatures, lots of photosynthesis
What type of energy does a wind turbine have?
a) chemical
b) thermal
c) mechanical
d) electrical
c) mechanical
What was Ms Ray's major in college?
a) education/teaching
b) biology
c) physics & astronomy
d) chemistry
d) chemistry
What kind of chemical reaction is this?
C8H10 + O2 --> CO2 + H2O
Combustion
How many grams of H2O can be made from 5g H2?
2 H2 + O2 --> 2 H2O
45 g H2O
What things make turbidity higher?
runoff, algae, mixing in shallow water
How much energy is in the bonds of CO2?
O=C=O
1598 jk
What science class are you taking next year?
a) environmental science
b) physics
c) biology
d) earth science
a) environmental science
What is one thing that can increase the speed of the chemical reaction?
increasing the temperature, increasing concentration of reactants, increasing surface area, increasing pressure
How many molecules of H2 will react with 2 molecules of N2?
N2 + 3H2 --> 2NH3
6 molecules of H2
What would be the best solution to neutralize hydrochloric acid (pH =2)?
a) vinegar (pH 3)
b) water (pH 7)
c) ammonia (pH 10)
d) bleach (pH 12)
d) bleach (pH 12)
If the energy of the reactants is 1390 jk and the energy of the products is 1246 jk, is the reaction endothermic or exothermic? Would the reaction become hot or cold?
endothermic, cold
What is Ms. Boyle's new baby's name?
a) Emiliano
b) Dante
c) Justin
d) Boyle Jr
e) Adam
b) Dante!