Daily TAKS Connection: Conservation of Mass. IPC(8) The student knows that changes in matter affect everyday life. The student is expected to: (C) investigate and identify the law of conservation of mass. Instructions: Hamburger fold the foldable handouts
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IPC(8) The student knows that changes in matter affect everyday life. The student is expected to:
(C) investigate and identify the law of conservation of mass
Hamburger fold the foldable handouts
Cut 2 cm slits from the edges of the fold of the handout that has page 2 (as marked)
Cut along the fold line of the other sheet of paper beginning and ending about 2 cm from each end (as marked).
Burrito fold and insert paper from step 2 into the hole and open, forming a book.
Color the front coverDay 1: Construct a folded book foldable
Construct a folded book foldable titled “Conservation of Mass”
Image source: http://www.iun.edu/~cpanhd/C101webnotes/matter-and-energy/images/h2o2.jpg
If all the reactants in a chemical reaction are completely used, which of the following statements accurately describes the relationship between the reactants and the products?
a. The products must have a different physical state than the reactants.
b. The total mass of the reactants must equal the total mass of the products.
c. The reactants must contain more complex molecules than the products do.
d. The density of the reactants must equal the density of the products.
The chemical equation shows H20 being decomposed. Which of these statements best describes the mass of the products if 150 g of H20 is decomposed?
a. The mass of each product is equal to the mass of the H20.
b. The sum of the products’ masses is 150 g.
c. The sum of the products’ masses equals the mass of the H20.
d. Both b and c.
In the procedure shown, a calcium chloride solution is mixed with a sodium sulfate solution to create the products shown. Which of the following is illustrated by this activity?
a. The law of conservation of reactants
b. The law of conservation of products
c. The law of conservation of mass
d. The law of conservation of energy
Which of these would support the idea that mass is conserved in a reaction that produces a gas as a product?
a. Heating the reactants to ensure the reaction occurs in a gaseous state
b. Subtracting the mass of the gas from the mass of the solid and liquid products
c. Mixing the reactants and measuring their total mass
d. Trapping the gas and measuring its mass
The mass of a rusty nail is found to be slightly greater than the mass of the same nail before it rusted. The change in mass indicates that the rusting process —
a. is a physical change
b. involves an energy-to-matter conversion
c. decreases the density of the metal
d. involves metal bonding with other atoms
The illustrations show a conservation-of-mass experiment. The solution in the beaker lost mass because —
a. materials have less mass at high temperatures
b. the mass of the reactants and products was less than 100 g
c. sodium sulfate (Na2SO4) is lighter than air
d. some of the water molecules turned into water vapor
an atom is indicated by an uppercase letter
Example: H – Hydrogen
an uppercase letter followed by a lowercase letter
Example: Hg – mercury
Determine the number of each atom type.
Subscript multiplied bycoefficient
2H20Day 4 Notes – record on page 4 of the foldable
2Na + MgF2→ 2NaF + Mg
Because there are the same number of each type of atom in the reactants and products, this equation is balanced and supports the law of conservation of mass.
Record the following steps on page 7 of your foldable. Use these steps to balance the equation shown.
How to balance a chemical equation: