Download HW 3 - EPIC Chemistry

Name:
HONORS Homework #3
Purple Due Date: May 6 & Green Due Date: May 7
Law of Conservation of Mass
1. Which of the following answer choices correctly describes the law of conservation of mass
a. Mass can neither be created nor destroyed
b. The mass put into a reaction is not always equal to the mass produced from that reaction
c. Mass is neither lost nor gained in a chemical reaction
d. The mass put into a reaction can be lost in the form of heat, or mass can be gained from
reacting various substances together
2. If I have 7 atoms of Oxygen in my reactants, how many atoms of oxygen will I have in my products?
3. A balanced chemical equation is shown below
C6H12O6(l)  2C2H6O(l) + 2CO2(g)
Which of the following statements correctly compares the mass of the reactant with the mass of the
products?
a. The mass of the reactant is half the mass of the products
b. The mass of the reactant is twice the mass of the products
c. The mass of the reactant is one-fourth the mass of the products
d. The mass of the reactant is equal to the mass of the products
Parts of a Reaction Equation
1. What does the (s) stand for in a reaction equation?
s = _____________
2. What does the (l) stand for in a reaction equation?
l = _____________
3. What does the (g) stand for in a reaction equation?
g = _____________
4. What does the (aq) stand for in a reaction equation?
aq = _____________
5. How many reactants are there in question # 3 from the Law of Conservation of Mass Section above?
_____________ Reactants
6. How many products are there in question # 3 from the Law of Conservation of Mass Section above?
_____________ Products
Physical vs. Chemical Change & Types f Chemical Reactions
1) Based on the reaction equations below, determine whether the reaction shown is a physical or
chemical reaction, if chemical, determine what type of chemical reaction it is.
Reaction Equation
Physical or Chemical?
Al(OH)3(aq) + H2SO4(aq)  Al2(SO4)3(aq) + H2O(l)
S8(g) + O2(g)  SO3(g)
Br2 (l)  Br2 (g)
C3H8 + O2  CO2 + H2O
I2(s)  I2 (g)
2) Which of the following diagrams represents a single exchange reaction?
a. AB + CD  CB + Ad
b. AB + C  ABC
c. AB + C  A + BC
d. ABC  A + BC
Counting Atoms & Balancing Reactions
1) Balance the following chemical reactions:
a. ____H2(g) + ____O2(g)  ____H2O(l)
b. ____AgCl + ____PbSO4  ____Ag2SO4 + ____PbCl
c. ____NaN3(s)  ____Na(s) + ____N2(g)
Type of Chemical Reaction
d. ____C2H4(l) + ____O2(g)  ____CO2(g) + ____H2O(l)
e. ____Fe(s) + ____NaBr(aq)  ____FeBr3(aq) + ____Na(s)
f. ____S8 + ____O2  ____SO3
The Mole and Molar Mass
1. How many particles are in a mole?
_____________ Particles
2. What is the mass of one mole of Carbon?
3. What is the mass of one mole of NaOH?
4. What is the mass of 3 moles of Potassium?
5. What is the mass of 2 moles of Mg2Br?
Converting Between Moles and Particles
1. How many particles are in 15 moles of Carbon?
2. How many particles are in 2.5 moles of BF5?
3. How many moles are in 6.022X1023 particles of Helium?
4. How many moles are in 5.3x1012 particles of HF?
5. How many moles are in 4.62x108 particles of H2O2?